CN108506376A - A kind of New Rotary magnetic rheological brake - Google Patents

Abstract

The invention discloses a kind of novel magnetorheological rotary dampers, are mainly made of left end cap, brake inner cylinder, magnet exciting coil, damper outer barrel, coil supporter iron core, spiral piston rod, left end cap, right bearing etc..Power supply is powered by magnet exciting coil and generates magnetic field, magnetorheological fluid is under spiral piston rod impetus, it is moved in damping clearance inner-spiral type, and generate magnetic rheology effect under magnetic fields, so that the shear stress of magnetorheological fluid increases, larger rotating torque is generated, the rotation of spiral piston rod is hindered.The invention changes the type of flow of magnetorheological fluid using spiral piston rod, can increase braking moment by increasing contact area in the case where magnetorheological fluid dosage is constant.Magnet exciting coil is wrapped on coil supporter iron core simple and compact for structure, the easy to disassemble and repair so that brake.Present invention is particularly suitable for application in the damping antidetonations that the braking occasion of semi- active control and seat suspension etc. rotate occasion.

Description

A New Rotary Magneto-Rheological Brake

technical field

The invention relates to a magnetorheological brake, in particular to a novel rotary magnetorheological brake.

Background technique

Magneto-rheological brake is a new type of semi-active braking device based on the controllable characteristics of magneto-rheological fluid. This device can generate resistance to motion and be used to dissipate the energy of motion. , small size, easy control and low energy consumption, it is an ideal vibration isolation and anti-seismic device, and has wide application prospects in construction, machinery, military industry, etc.

There are magneto-rheological fluid magneto-rheological brakes inside. Due to the different working environments and different behaviors, the magneto-rheological brakes can basically be divided into two forms, namely, linear differential magneto-rheological brakes and rotary There are two different types of magnetorheological brakes.

The linear magneto-rheological brake has many obvious advantages. Due to these advantages, it has played a big role in other civil engineering projects such as the construction of houses and bridges. It is even more effective in the initial construction of some cantilever bridges. It plays an indispensable role, and at the same time, it also has a good performance in the shock absorption and anti-seismic of buildings such as cars and houses. However, the linear differential magneto-rheological brake also has its insurmountable defects and deficiencies. The internal structure of the linear magneto-rheological brake is very bulky, and it is very dependent on the old-fashioned valve that only appears in the linear type. structure, and the piston rod is not very light, efficient and fast, and maintains a certain degree of fluency. During the movement, the piston rod is particularly prone to some jamming and bending by the high-speed moving brake. Using magnetorheological fluid Relatively many, increasing the cost.

The appearance of the rotary magneto-rheological brake has solved the above-mentioned problems of the linear magneto-rheological brake to a certain extent. Rotary magneto-rheological brakes are generally lighter in weight and more compact in design, and are more suitable for use in devices that require lightweight and are based on rotational motion. Therefore, designing a rotary magneto-rheological brake has a broader application prospect.

Contents of the invention

In order to overcome the problems in the background technology, the present invention proposes a novel rotary magneto-rheological brake. The torque generated by the drum-type magneto-rheological rotating brake in the present invention can effectively reduce the turning speed of the rotating shaft, and achieve effects such as deceleration or vibration reduction. The rotating shaft installed on the motor or other rotating power devices is driven to rotate, and when the rotating shaft rotates, it can drive the helical piston rod to rotate. The excitation coil is energized to generate a magnetic field. At this time, the magnetorheological fluid moves under the propulsion of the helical piston rod, and realizes a helical movement in the braking gap, and produces a magnetorheological effect, which generates a large rotational torque and hinders the rotating shaft. Rotation, so as to achieve the purpose of braking.

The technical solution adopted by the present invention to solve its technical problems includes: left end cover (1), brake inner cylinder (2), excitation coil (3), brake outer cylinder (4), coil carrier iron core (5), screw type piston Rod (6), right end cover (7), right bearing (8) and left bearing (9); the left end cover (1) is processed with a circular blind hole in the middle, and the right end surface is processed with a waist-shaped groove, and the screw and the stopper The outer cylinder (4) is fixedly connected; the left and right ends of the brake inner cylinder (2) are processed with waist-shaped bosses, which are connected with the waist-shaped grooves in the left end cover (1) and right end cover (7) for axial positioning; the coil The left and right ends of the carrier iron core (5) are processed with waist-shaped bosses, which are connected with the waist-shaped grooves in the left end cover (1) and the right end cover (7) for axial positioning; the middle of the right end cover (7) is processed with a blind The left end face is processed with a waist-shaped groove and is fixedly connected with the outer cylinder of the brake (4) by screws; the middle of the coil carrier iron core (5) is processed with two circular grooves, and the excitation coil (3) is wound on In the groove; the outer surface of the left end of the spiral piston rod (6) is in clearance fit with the inner surface of the blind hole of the left end cap (1), and is sealed by a sealing ring; the outer surface of the right end of the spiral piston rod (6) is blinded The inner surface of the hole is clearance fit and sealed by a sealing ring; the left end of the spiral piston rod (6) is axially positioned through the right end face of the left end cover (1), and the right end is axially positioned through the left end face of the right bearing (8); the left bearing (9) Axial positioning through the right end face of the blind hole of the left end cover (1) and the left shaft shoulder of the screw piston rod (6); axial positioning of the right bearing (8) through the left end face of the blind hole of the right end cover (7); The interference fit between the ring and the inner surface of the blind hole of the left end cover (1), the interference fit between the inner ring of the left bearing (9) and the outer surface of the screw type piston rod (6); the outer ring of the right bearing (8) and the blind hole of the right end cover (7) The inner surface of the hole is interference fit, the inner ring of the right bearing (8) and the outer surface of the helical piston rod (6) are interference fit; the gap between the brake inner cylinder (2) and the brake outer cylinder (4) forms an axial ring Damping gap Ⅰ (10); the gap between the coil carrier iron core (5) and the left end cover (1) and the helical piston rod (6) forms an axial circular ring damping gap Ⅱ (11); the inner cylinder of the brake (2) The gap between the coil carrier core (5) and the coil carrier core (5) forms an axial ring damping gap III (12); the gap between the coil carrier core (5) and the right end cover (7) forms a radial disk damping gap IV ( 13); the gap between the coil carrier core (5) and the left end cover (1) forms a radial disk damping gap V (14); the axial circular ring damping gap I (10), the axial circular ring damping gap II (11) and the axial annular damping gap III (12) are connected in parallel to form a fluid flow channel of the drum brake; the fluid flow channel is filled with magnetorheological fluid. According to claim 1, a novel disc magneto-rheological brake excited by an annular permanent magnet and an excitation coil is characterized in that: the brake inner cylinder (2), the brake outer cylinder (4) and the coil carrier iron core (5 ), made of low carbon steel magnetic material; the left end cover (1), screw type piston rod (6), right end cover (7), right bearing (8) and left bearing (9) are made of stainless steel non-magnetic material to make.

Compared with the background technology, the present invention has the beneficial effects of:

(1) The spiral design of the piston rod can make the magneto-rheological fluid flow spirally between the inner cylinder and the outer cylinder, and significantly improve the braking torque of the brake.

(2) Compared with the linear magneto-rheological brake, the present invention is small in size, light in weight, simple in structure, compact in design, easy to maintain, and saves installation space.

(3) The use of the practical magneto-rheological fluid increases the contact area with the magnetic field generated by the excitation coil, increases the braking torque of the rotary brake on the premise of saving costs, and solves the problem that the magnetorheological brakes generally exist The magneto-rheological fluid leakage problem simplifies the design structure and improves the manufacturing accuracy.

Description of drawings

Fig. 1 is the overall schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the damping gap structure of the liquid flow channel of the present invention.

Fig. 3 is the front view of the helical piston rod of the present invention.

Fig. 4 is a left view of the right end cover of the present invention.

Specific implementation instructions

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Fig. 1 is a structural schematic diagram of the present invention, which mainly includes a left end cover (1), a brake inner cylinder (2), an excitation coil (3), a brake outer cylinder (4), a coil carrier iron core (5), a helical piston rod (6 ), right end cover (7), right bearing (8) and left bearing (9).

Fig. 2 is a schematic diagram of the damping gap structure of the liquid flow channel of the present invention. The gap between the brake inner cylinder (2) and the brake outer cylinder (4) forms an axial ring damping gap I (10); the coil carrier iron core (5) and the left end cover (1), the screw piston rod (6) The gap between them forms the axial circular ring damping gap II (11); the gap between the inner cylinder of the brake (2) and the coil carrier core (5) forms the axial circular ring damping gap III (12); the coil carrier core The gap between (5) and the right end cover (7) forms the radial disc damping gap IV (13); the gap between the coil carrier core (5) and the left end cover (1) forms the radial disc damping gap V (14); Axial circular ring damping gap I (10), axial circular ring damping gap II (11) and axial circular ring damping gap III (12) are connected in parallel to form the fluid flow channel of the drum brake; inside the fluid flow channel Filled with magnetorheological fluid.

Fig. 3 is a schematic diagram of the helical piston rod of the present invention, the helical piston rod is formed with a left-handed thread with a helical inclination angle.

Fig. 4 is the left view of the right end cover of the present invention, the middle of the right end cover (7) is processed with a circular through hole, and its left end is processed with four symmetrically distributed waist-shaped grooves, and the thickness of the boss is respectively the same as that of the coil carrier iron core (5), The thickness of the waist-shaped bosses of the brake inner cylinder (2) is equal.

The working principle of the present invention is as follows:

The DC servo motor drives the helical piston rod (6) to produce different rotational speeds. When the helical piston rod (6) rotates, the magnetorheological fluid is pushed forward, and the power supply energizes the rotating carrier core through the excitation coil (3) (5) Generate a magnetic field. At this time, under the action of the magnetic field, the magnetorheological fluid moves in a spiral manner in the braking gap between the carrier iron core 5 and the brake inner cylinder (2), the brake inner cylinder (2) and the brake outer cylinder (4) , and produce a magnetorheological effect, the apparent viscosity of the magnetorheological fluid increases, and the shear stress increases, thereby generating a larger rotational torque, hindering the rotation of the helical piston rod (6), thereby producing the purpose of braking.

Claims (3)

1. a kind of New Rotary magnetic rheological brake, it is characterised in that including：Left end cap (1), damper inner cylinder (2), excitation Coil (3), damper outer barrel (4), coil supporter iron core (5), spiral piston rod (6), right end cap (7), right bearing (8) and Left bearing (9)；It is machined with blind round hole among left end cap (1), right side is machined with kidney-shaped groove, and passes through screw and damper Outer barrel (4) is fixedly connected；Damper inner cylinder (2) left and right ends are machined with kidney-shaped boss, and in left end cap (1), right end cap (7) Kidney-shaped groove be connected carry out axially position；Coil supporter iron core (5) left and right ends are machined with kidney-shaped boss, with left end cap (1), the kidney-shaped groove in right end cap (7), which is connected, carries out axially position；It is machined with blind shape through-hole, left end among right end cap (7) Face is machined with kidney-shaped groove and is fixedly connected with damper outer barrel (4) by screw；It is machined with two among coil supporter iron core (5) A toroidal cavity, magnet exciting coil (3) are wound in a groove；Spiral piston rod (6) left end outer surface and left end cap (1) blind hole Internal surface gaps coordinate, and are sealed by sealing ring；Spiral piston rod (6) right end outer surface and table in right end cap (7) blind hole Face clearance fit, and sealed by sealing ring；Spiral piston rod (6) left end is right by left end cap (1) right side axially position End passes through right bearing (8) left side axially position；Left bearing (9) passes through left end cap (1) blind hole right side and spiral piston rod (6) left axle shoulder axially position；Right bearing (8) passes through right end cap (7) blind hole left side axially position；Left bearing (9) outer ring and a left side End cap (1) blind hole internal surface is interference fitted, and left bearing (9) inner ring is interference fitted with spiral piston rod (6) outer surface；Right bearing (8) outer ring is interference fitted with right end cap (7) blind hole internal surface, right bearing (8) inner ring and spiral piston rod (6) outer surface interference Cooperation.

2. a kind of New Rotary magnetic rheological brake according to claim 1, it is characterised in that：Damper inner cylinder (2) Gap between damper outer barrel (4) forms axial annulus damping clearance I (10)；Coil supporter iron core (5) and left end cap (1), the gap between spiral piston rod (6) forms axial annulus damping clearance II (11)；Damper inner cylinder (2) is carried with coil Gap between body iron core (5) forms axial annulus damping clearance III (12)；Between coil supporter iron core (5) and right end cap (7) Gap form radial disk damping gap IV (13)；Gap between coil supporter iron core (5) and left end cap (1) forms radial direction Disk damping gap V (14)；Axial annulus damping clearance I (10), axial annulus damping clearance II (11) and axial annulus resistance Buddhist nun gap III (12) parallel connection collectively constitutes the fluid course of drum brake；Magnetorheological fluid is filled in fluid course.

3. a kind of magnetorheological braking of Novel disc-type encouraged using annular permanent magnet and magnet exciting coil according to claim 1 Device, it is characterised in that：Damper inner cylinder (2), damper outer barrel (4) and coil supporter iron core (5), by mild steel permeability magnetic material It is made；Left end cap (1), spiral piston rod (6), right end cap (7), right bearing (8) and left bearing (9) are non-magnetic by stainless steel Material is made.