CN103075443A - Magnetofluid brake drum device - Google Patents

Magnetofluid brake drum device Download PDF

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Publication number
CN103075443A
CN103075443A CN2013100217536A CN201310021753A CN103075443A CN 103075443 A CN103075443 A CN 103075443A CN 2013100217536 A CN2013100217536 A CN 2013100217536A CN 201310021753 A CN201310021753 A CN 201310021753A CN 103075443 A CN103075443 A CN 103075443A
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China
Prior art keywords
brake
pad
fluid
power pad
electromagnetic coil
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CN2013100217536A
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Chinese (zh)
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CN103075443B (en
Inventor
郑运婷
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Nantong Xinsidi Electromechanical Co ltd
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Individual
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Priority to CN201310021753.6A priority Critical patent/CN103075443B/en
Publication of CN103075443A publication Critical patent/CN103075443A/en
Priority to PCT/CN2013/091243 priority patent/WO2014106450A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F16D49/16—Brakes with two brake-blocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
    • F16D57/002—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders comprising a medium with electrically or magnetically controlled internal friction, e.g. electrorheological fluid, magnetic powder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D65/80—Features relating to cooling for externally-engaging brakes
    • F16D65/813—Features relating to cooling for externally-engaging brakes with closed cooling system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D65/84—Features relating to cooling for disc brakes
    • F16D65/853—Features relating to cooling for disc brakes with closed cooling system

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The magnetofluid brake drum device comprises a shell, a brake disc, a rotating shaft, a brake claw, a brake power pad, magnetofluid, brake fluid, an electromagnetic coil and a controller; the magnetic field of the electromagnetic coil is controlled by the controller, the specific gravity of the magnetofluid in the brake power pad is controlled by the magnetic field, the brake power pad is controlled to move by the change of the gravity of the magnetofluid, the brake pad and the brake disc are driven to be in friction braking by the movement of the brake power pad, the temperatures of the brake pad and the brake disc are reduced by the brake fluid, and the service lives of the brake pad and the brake disc are prolonged.

Description

Magnetic fluid brake drum device
Technical field
The present invention relates to a kind of braking device, particularly a kind of magnetic fluid brake drum device.
Background technique
The braking device of existing Motor Vehicle and some equipment, during brake, utilize oil gear driving brake block and brake disc surface friction drag to brake, the impact force of brake is larger, the temperature of brake block and brake disc friction is higher, brake block weares and teares easily, has affected the working life of brake block and brake disc, also is unfavorable for the safety of braking simultaneously.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the magnetic fluid brake drum device that provides a kind of Motor Vehicle and equipment to use, utilize the magnetic field of controller control electromagnetic coil, utilize the proportion of magnetic field control magnetic fluid, utilize the gravity of magnetic fluid to drive brake block and brake disc friction brake, utilize brake fluid to reduce the temperature of brake block and brake disc.
The technical solution adopted in the present invention is: magnetic fluid brake drum device includes shell, brake disc, rotatingshaft, brake pad, brake power pad, magnetic fluid, brake fluid, electromagnetic coil and controller; Brake disc is fixedly connected with rotatingshaft, and rotatingshaft is connected movingly with the bearing of shell, and brake disc is sealed in the braking die cavity of shell, is provided with brake fluid in the braking die cavity; Brake pad is positioned at the top of brake disc, the brake block of brake pad is positioned at the opposite of brake disc braking surface, and brake pad and shell are hinged, and brake pad is provided with spring and is connected with shell, utilize the elastic force of spring to hold brake pad, make the brake block of brake pad leave the braking surface of brake disc; Brake power pad is positioned at the top of brake pad, be sealed with magnetic fluid in the brake power pad, electromagnetic coil is located at the outside of brake power pad, the magnetic line of force of electromagnetic coil is through magnetic fluid, controller is provided with guide line and is connected with electromagnetic coil, the proportion of brake power pad is less than the proportion of brake fluid, and the gravity of brake power pad is padded on the buoyancy that brake fluid is subject to less than brake power.
During use, shell is fixedly connected with the frame of Motor Vehicle or equipment, and rotatingshaft is fixedly connected with the rotating shaft that needs braking; During braking, utilize controller to connect the power supply of electromagnetic coil, electromagnetic coil produces magnetic field, the magnetic field magnetic fluid magnetization in the power pad of will braking, utilize the magnetic intensity of controller control electromagnetic coil constantly to increase, the proportion of magnetic fluid is constantly increased, make the proportion of brake power pad greater than the proportion of brake fluid, make the proportion of brake power pad greater than the proportion of brake fluid, the elastic force that makes brake power pad overcome spring promotes the brake block of brake pad to lower swing, make brake block and brake disc friction, utilize brake block and brake disc frictional force to hinder brake disc and rotate; When brake is removed, controller cuts off the power supply of electromagnetic coil, the magnetic field of electromagnetic coil disappears, the proportion of magnetic fluid returns to original unmagnetized state in the brake power pad, the gravity of brake power pad is padded on the buoyancy that brake-fluid is subject to less than brake power, brake pad resets at the elastic force effect lower swing of spring, and the brake block of brake pad leaves brake disc, and brake is removed; Utilize the magnetic field of controller control electromagnetic coil, utilize the proportion of magnetic field control magnetic fluid, utilize the proportion of the specific gravity control brake power pad of magnetic fluid, utilize the GRAVITY CONTROL brake power pad of brake power pad to move down, utilize brake power pad to move down and promote the brake pad brake, to reach the purpose of utilizing controller control brake; Shell is provided with radiating fin, and the fricative heat of brake block and brake disc is delivered to shell through brake fluid, and heat is distributed by shell again, improves the effect of heat radiation, reduces the temperature of brake block and brake disc friction, improves the working life of brake block and brake disc.
The invention has the beneficial effects as follows: magnetic fluid brake drum device includes shell, brake disc, rotatingshaft, brake pad, brake power pad, magnetic fluid, brake fluid, electromagnetic coil and controller; Utilize the magnetic field of controller control electromagnetic coil, utilize the proportion of magnetic fluid in the magnetic field control brake power pad, utilizing the variation of the gravity of magnetic fluid to control brake power pad moves, utilize brake power pad to move to drive brake block and brake disc friction brake, utilize brake fluid to reduce the temperature of brake block and brake disc, improve the working life of brake block and brake disc.
Description of drawings
Fig. 1 is the structural representation of magnetic fluid brake drum device;
Fig. 2 is the left view of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the present invention is further detailed:
The structural representation of magnetic fluid brake drum device shown in Figure 1 and the left view of Fig. 1 shown in Figure 2, magnetic fluid brake drum device include shell 1, brake disc 2, rotatingshaft 3, brake pad 4, brake power pad 5, magnetic fluid 6, brake fluid 7, electromagnetic coil 8 and controller 9; Brake disc 2 is fixedly connected with rotatingshaft 3, and the axis of rotatingshaft 3 is identical with the axis of brake disc 2, and rotatingshaft 3 is connected movingly with shell 1, and brake disc 2 is sealed in the braking die cavity 10 of shell 1, is provided with brake fluid 7 in the braking die cavity 10; Brake pad 4 is positioned at the top of brake disc 2, the brake block 11 of brake pad 4 is positioned at the opposite of brake disc 2 braking surfaces 12, brake pad 4 is hinged with shell 1, brake pad 4 is provided with spring 13 and is connected with shell 1, spring 13 is extension spring, and spring 13 1 ends are connected with the interior connecting ring 16 of shell 1, and spring 13 the other ends are connected with the outer connecting ring 17 of brake pad 4, utilize the elastic force of spring 13 to hold brake pad 4, make the brake block 11 of brake pad 4 leave the braking surface 12 of brake disc 2; Brake power pad 5 is positioned at the top of brake pad 4, be sealed with magnetic fluid 6 in the brake power pad 5, electromagnetic coil 8 is located at the outside of brake power pad 5, the magnetic line of force of electromagnetic coil 8 is through magnetic fluid 6, controller 9 is provided with guide line and is connected with electromagnetic coil 8, the proportion of brake power pad 5 is less than the proportion of brake fluid 7, and the gravity of brake power pad 5 in the buoyancy that brake fluid 7 is subject to, makes brake power pad 5 be suspended in the top of brake pad 4 less than brake power pad 5.Be provided with seal ring 22 between the bearing support 21 of rotatingshaft 3 and shell 1, be used for reducing brake fluid 7 and reveal.
The working principle of magnetic fluid brake drum device is: during use, shell 1 is fixedly connected with the frame of Motor Vehicle or equipment, and rotatingshaft 3 is fixedly connected with the rotating shaft that needs braking; During braking, utilize controller 9 to connect the power supply of electromagnetic coil 8, electromagnetic coil 8 produces magnetic field, magnetic field magnetic fluids 6 magnetization in the power pad 5 of will braking, utilize the magnetic intensity of controller 9 control electromagnetic coils 8 constantly to increase, the proportion of magnetic fluid 6 is constantly increased, make the proportion of brake power pad 5 greater than the proportion of brake fluid 7, the proportion of brake power pad 5 is greater than the proportion of brake fluid 7, the elastic force that makes brake power pad 5 overcome spring 13 promotes the brake block 11 of brake pad 4 to lower swing, make brake block 11 and brake disc 2 frictions, utilize brake block 11 and brake disc 2 frictional force to hinder brake disc 2 and rotate; When brake is removed, controller 9 cuts off the power supply of electromagnetic coil 8, the magnetic field of electromagnetic coil 8 disappears, the proportion of brake power pad 5 interior magnetic fluids 6 returns to original unmagnetized state, the buoyancy that the gravity of brake power pad 5 is subject in brake-fluid 7 less than brake power pad 5, brake pad 4 resets at the elastic force effect lower swing of spring 13, and the brake block 11 of brake pad 4 leaves brake disc 2, and brake is removed; Utilize the magnetic field of controller 9 control electromagnetic coils 8, utilize the proportion of magnetic field control magnetic fluid 6, utilize the proportion of the specific gravity control brake power pad 5 of magnetic fluid 6, utilize the specific gravity control brake power pad 5 of brake power pad 5 to move down, utilize brake power pad 5 to move down and promote brake pad 4 brakes, to reach the purpose of utilizing controller 9 control brakes.
In order to implement to utilize the magnetic intensity of controller 9 control electromagnetic coils 8, the voltage that controller 9 constantly changes to electromagnetic coil 8 outputs, the magnetic intensity of electromagnetic coil 8 increases with the rising of controller 9 to electromagnetic coil 8 input voltages, the voltage that controller 9 flows to electromagnetic coil 8 improves, the magnetic intensity of electromagnetic coil 8 increases, controller 9 flows to the lower voltage of electromagnetic coil 8, and the magnetic intensity of electromagnetic coil 8 reduces.Controller 9 is to the voltage of the variation of electromagnetic coil 8 outputs, and the scope of the voltage of variation is by 12 volts to 380 volts.
For the proportion that makes brake power pad 5 proportion less than brake fluid 7, brake power pad 5 is made of rubber sealant 14 and foam layer 15, foam layer 15 is sealed in the rubber sealant 14, magnetic fluid 6 is sealed in the foam layer 15, brake fluid 7 is water, perhaps, brake fluid is the emulsified liquid of water, and the proportion of brake power pad 5 is less than the proportion of the emulsified liquid of water or water; The excursion of magnetic fluid 6 proportions is 1.2 gram per centimeters 3To 20 gram per centimeters 3The excursion of the proportion of brake power pad 5 is 0.9 gram per centimeter 3To 19 gram per centimeters 3
In order to make brake pad 4 symmetrical brakes, brake pad 4 comprises by left brake pad 18 and right brake pad 19, is provided with positioning gap 20 between left brake pad 18 and the right brake pad 19, and brake power pad 5 is provided with positioning boss 21, and positioning boss 21 is positioned at the position of positioning gap 20.
In order to improve the radiating efficiency of brake, brake fluid 7 is full of braking die cavity 10, utilizes brake fluid 7 to reduce brake block 11 and brake disc 2 friction temperatures; Shell 1 is provided with radiating fin 23, brake block 11 is delivered to shell 1 with brake disc 2 fricative heats through brake fluid 7, and heat is distributed by shell 1 again, by the effect of heat radiation, reduce the temperature of brake block 11 and brake disc 2 frictions, the working life of improving brake block 11 and brake disc 2.
The non-braking state of magnetic fluid brake drum device is: brake power pad 5 is subject to the buoyancy that brake fluid 7 makes progress, and the brake block 11 of brake pad 4 is gapped with the braking surface 12 of brake disc 2.The braking state of magnetic fluid brake drum device is: the magnetic fluid 6 of brake power pad 5 is by the magnetic field magnetisation of electromagnetic coil 8, the proportion of brake power pad 5 increases, brake power pad 5 downward gravity are subject to buoyancy upwards greater than brake power pad 5 in brake fluid 7, and the brake block 11 of brake pad 4 brakes with braking surface 12 contact frictions of brake disc 2.
For reduce ferromagnetic material to electromagnetic coil 8 magnetic fields interference, it is characterized in that: described shell 1, brake disc 2, brake pad 4 and brake power pad 5 consist of for nonferromagnetic material, shell 1 and brake disc 2 are made of aluminum alloy, and brake pad 4 is made of aluminum alloy and ceramic abrasive.
In order to make brake power pad 5 be positioned at the top of brake pad 4, it is characterized in that: the braking die cavity 10 of described shell 1 is provided with restraining groove 24, and brake power pad 5 is actively tied in the restraining groove 24, makes brake power pad 5 in restraining groove 24 interior rising or declines.

Claims (6)

1.磁流体刹车鼓装置，包括有外壳(1)、制动盘(2)、转动轴(3)、刹车爪(4)、刹车动力垫(5)、磁流体(6)、制动液(7)、电磁线圈(8)以及控制器(9)；制动盘(2)与转动轴(3)固定连接，转动轴(3)与外壳(1)动配合连接，制动盘(2)密封于外壳(1)的制动型腔(10)内，制动型腔(10)内设有制动液(7)；刹车爪(4)位于制动盘(2)的上方，刹车爪(4)的刹车片(11)位于制动盘(2)制动面(12)的对面，刹车爪(4)与外壳(1)铰接，刹车爪(4)设有弹簧(13)与外壳(1)连接，利用弹簧(13)的弹力拉住刹车爪(4)，使刹车爪(4)的刹车片(11)离开制动盘(2)的制动面(12)；刹车动力垫(5)位于刹车爪(4)的上方，刹车动力垫(5)内密封有磁流体(6)，电磁线圈(8)设于刹车动力垫(5)的外部，电磁线圈(8)的磁力线经过磁流体(6)，控制器(9)设有控制线与电磁线圈(8)连接；1. Magnetic fluid brake drum device, including casing (1), brake disc (2), rotating shaft (3), brake pawl (4), brake power pad (5), magnetic fluid (6), brake fluid (7), electromagnetic coil (8) and controller (9); the brake disc (2) is fixedly connected with the rotating shaft (3), and the rotating shaft (3) is connected with the housing (1) in motion fit, and the brake disc (2) ) is sealed in the brake cavity (10) of the shell (1), and the brake fluid (7) is arranged in the brake cavity (10); the brake pawl (4) is located above the brake disc (2), and the brake The brake pad (11) of the pawl (4) is positioned at the opposite side of the braking surface (12) of the brake disc (2), the brake pawl (4) is hinged with the casing (1), and the brake pawl (4) is provided with a spring (13) and The casing (1) is connected, and the brake claw (4) is pulled by the elastic force of the spring (13), so that the brake pad (11) of the brake claw (4) is separated from the braking surface (12) of the brake disc (2); the braking force The pad (5) is located above the brake pawl (4), the brake power pad (5) is sealed with a magnetic fluid (6), the electromagnetic coil (8) is arranged outside the brake power pad (5), and the electromagnetic coil (8) The magnetic force line passes through the magnetic fluid (6), and the controller (9) is provided with a control line connected with the electromagnetic coil (8); 磁流体刹车鼓装置的工作原理是：使用时，外壳(1)与机动车或者设备的机架固定连接，转动轴(3)与需要制动的转轴固定连接；制动时，利用控制器(9)接通电磁线圈(8)的电源，电磁线圈(8)产生磁场，磁场将刹车动力垫(5)内的磁流体(6)磁化，利用控制器(9)控制电磁线圈(8)的磁场强度不断增加，使磁流体(6)的比重不断增加，使刹车动力垫(5)的比重大于制动液(7)的比重，刹车动力垫(5)的比重大于制动液(7)的比重，使刹车动力垫(5)克服弹簧(13)的弹力推动刹车爪(4)的刹车片(11)向下摆动，使刹车片(11)与制动盘(2)摩擦，利用刹车片(11)与制动盘(2)摩擦力阻碍制动盘(2)转动；刹车解除时，控制器(9)切断电磁线圈(8)的电源，电磁线圈(8)的磁场消失，刹车动力垫(5)内磁流体(6)的比重恢复到原来未磁化的状态，刹车动力垫(5)的重力小于刹车动力垫(5)于刹车液(7)受到的浮力，刹车爪(4)在弹簧(13)的弹力作用下摆动复位，刹车爪(4)的刹车片(11)离开制动盘(2)，刹车解除；利用控制器(9)控制电磁线圈(8)的磁场，利用磁场控制磁流体(6)的比重，利用磁流体(6)的比重控制刹车动力垫(5)的比重，利用刹车动力垫(5)的比重控制刹车动力垫(5)向下移动，利用刹车动力垫(5)向下移动推动刹车爪(4)刹车。The working principle of the magnetic fluid brake drum device is: when in use, the casing (1) is fixedly connected with the frame of the motor vehicle or equipment, and the rotating shaft (3) is fixedly connected with the rotating shaft that needs to be braked; when braking, the controller ( 9) Turn on the power supply of the electromagnetic coil (8), the electromagnetic coil (8) generates a magnetic field, and the magnetic field magnetizes the magnetic fluid (6) in the brake power pad (5), and the controller (9) is used to control the magnetic field of the electromagnetic coil (8). The strength of the magnetic field is continuously increased, so that the proportion of the magnetic fluid (6) is continuously increased, so that the proportion of the brake power pad (5) is greater than that of the brake fluid (7), and the proportion of the brake power pad (5) is greater than that of the brake fluid (7) specific gravity, so that the brake power pad (5) overcomes the elastic force of the spring (13) and pushes the brake pad (11) of the brake pawl (4) to swing downward, making the brake pad (11) rub against the brake disc (2), and the brake The friction between the disc (11) and the brake disc (2) hinders the rotation of the brake disc (2); when the brake is released, the controller (9) cuts off the power supply of the electromagnetic coil (8), the magnetic field of the electromagnetic coil (8) disappears, and the brake The specific gravity of the magnetic fluid (6) in the power pad (5) returns to the original unmagnetized state, the gravity of the brake power pad (5) is less than the buoyancy force of the brake power pad (5) on the brake fluid (7), and the brake pawl (4 ) swings and resets under the elastic force of the spring (13), the brake pad (11) of the brake pawl (4) leaves the brake disc (2), and the brake is released; the controller (9) is used to control the magnetic field of the electromagnetic coil (8), Utilize the magnetic field to control the proportion of the magnetic fluid (6), utilize the proportion of the magnetic fluid (6) to control the proportion of the brake power pad (5), utilize the proportion of the brake power pad (5) to control the brake power pad (5) to move downward, use The brake power pad (5) moves downward to push the brake pawl (4) to brake. 2.根据权利要求1所述的磁流体刹车鼓装置，其特征在于：所述的刹车动力垫(5)的比重小于制动液(7)的比重，刹车动力垫(5)的重力小于刹车动力垫(5)于制动液(7)受到的浮力。2. The magnetic fluid brake drum device according to claim 1, characterized in that: the specific gravity of the brake power pad (5) is smaller than that of the brake fluid (7), and the gravity of the brake power pad (5) is smaller than that of the brake fluid. The buoyancy force of the power pad (5) on the brake fluid (7). 3.根据权利要求2所述的磁流体刹车鼓装置，其特征在于：所述的控制器(9)向电磁线圈(8)输出的变化的电压，变化的电压的范围由12伏至380伏。3. The magnetic fluid brake drum device according to claim 2, characterized in that: the variable voltage output by the controller (9) to the electromagnetic coil (8), the range of the variable voltage is from 12 volts to 380 volts . 4.根据权利要求1所述的磁流体刹车鼓装置，其特征在于：所述的磁流体(6)比重的变化范围为1.2克/厘米3至20克/厘米3；4. magnetic fluid brake drum device according to claim 1, is characterized in that: the range of variation of described magnetic fluid (6) specific gravity is 1.2 grams/centimeter 3 to 20 grams/ centimeter ; 5.根据权利要求1所述的磁流体刹车鼓装置，其特征在于：所述的刹车动力垫(5)的比重的变化范围为0.9克/厘米3至19克/厘米3。 5. The magnetic fluid brake drum device according to claim 1, characterized in that: the specific gravity of the brake power pad (5) ranges from 0.9 g/ cm3 to 19 g/cm3 . 6.根据权利要求1所述的磁流体刹车鼓装置，其特征在于：所述的制动液(7)充满制动型腔(10)，利用制动液(7)降低刹车片(11)与制动盘(2)摩擦温度。6. The magnetic fluid brake drum device according to claim 1, characterized in that: the brake fluid (7) is filled with the brake cavity (10), and the brake pad (11) is lowered by the brake fluid (7). Friction temperature with the brake disc (2).
CN201310021753.6A 2013-01-03 2013-01-03 Magnetofluid brake drum device Active CN103075443B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201310021753.6A CN103075443B (en) 2013-01-03 2013-01-03 Magnetofluid brake drum device
PCT/CN2013/091243 WO2014106450A1 (en) 2013-01-03 2013-12-31 Magnetic fluid brake drum device

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Application Number Priority Date Filing Date Title
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CN103075443B CN103075443B (en) 2015-05-20

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WO2014106448A1 (en) * 2013-01-03 2014-07-10 Yang Guohui Magnetic fluid brake drum
WO2014106454A1 (en) * 2013-01-03 2014-07-10 Yang Guohui Brake drum device
WO2014106450A1 (en) * 2013-01-03 2014-07-10 Yang Guohui Magnetic fluid brake drum device

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CN102141100A (en) * 2011-03-14 2011-08-03 林智勇 Magnetic fluid brake device
CN102162497A (en) * 2011-03-14 2011-08-24 林智勇 Magnetic fluid brake device

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* Cited by examiner, † Cited by third party
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WO2014106451A1 (en) * 2013-01-03 2014-07-10 Yang Guohui Magnetic fluid buoyancy brake drum
WO2014106448A1 (en) * 2013-01-03 2014-07-10 Yang Guohui Magnetic fluid brake drum
WO2014106454A1 (en) * 2013-01-03 2014-07-10 Yang Guohui Brake drum device
WO2014106450A1 (en) * 2013-01-03 2014-07-10 Yang Guohui Magnetic fluid brake drum device

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WO2014106450A1 (en) 2014-07-10

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