A cylindrical liquid-cooled permanent magnetic retarder and a vehicle comprising the retarder

Abstract

The invention discloses a cylinder-type liquid-cooled permanent magnetic retarder and a vehicle including the retarder. The cylinder-type liquid-cooled permanent magnetic retarder includes: a stator assembly, a magnetic thrust bearing, a rotor assembly and a driving device; the stator assembly includes a metal cylinder sleeve and an end cover; the magnetic thrust bearing includes a bearing outer ring and a bearing inner ring; the rotor assembly includes a key shaft, a key sleeve and a permanent magnet; the key sleeve includes a bearing mounting cavity, a magnet mounting groove is arranged on the periphery of the key sleeve, and the permanent magnet is installed in the magnet mounting groove; the bearing outer ring or the bearing inner ring is installed in the bearing mounting cavity; the key sleeve is sleeved on the key shaft; the driving device is installed on the end cover of the stator assembly, and the driving shaft of the driving device is connected to the corresponding bearing inner ring or bearing outer ring. Due to the use of the magnetic thrust bearing, the rigid mechanical structure bearing with contact is transformed into a non-contact flexible magnetic bearing, which solves the damage to the mechanical bearing caused by the high-speed and high-thrust working conditions and increases the service life of the bearing.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile retarders, and in particular relates to a cylindrical liquid-cooled permanent magnet retarder, and a vehicle comprising the retarder, such as a large truck or a large bus. Background Art

[0002] A retarder is a safety-assistant device for service braking that applies braking force to the vehicle's transmission components, reducing the vehicle's speed. Vehicles frequently traveling in mountainous or hilly areas often require the installation of auxiliary braking devices such as retarders to continuously reduce or maintain a stable speed for extended periods when descending long slopes and to reduce or relieve the load on the service brakes. Typically, passenger vehicles with a gross mass of 5 tons or more and trucks with a gross mass of 12 tons or more require this auxiliary braking deceleration device. Depending on their operating principle, automotive retarders can be categorized as hydraulic retarders or electric turbine retarders.

[0003] When a hydraulic retarder is operating, pressure is applied to the oil reservoir through the manipulation of a control valve, causing the working fluid to fill the working chamber between the rotor and stator. As the rotor rotates, the working fluid exerts a torque on the stator. The stator's counter-torque becomes the rotor's braking torque, whose value depends on the amount of fluid and pressure in the working chamber (depending on the braking intensity level set by the control valve) as well as the rotor's speed. The vehicle's kinetic energy is converted into heat energy through friction in the working fluid and the impact on the stator, raising the working fluid temperature. The disadvantages of a hydraulic retarder are long engagement and disengagement lag times, power loss when not in operation, and complex structure when used in mechanically driven vehicles, especially trailers.

[0004] The front and rear rotors of the eddy current retarder are connected to the main reducer input flange via a transition plate. The stator housing is fixed to the main reducer housing via a bracket. The stator is equipped with an excitation coil. During operation, current flows from the vehicle battery, generating a magnetic field, which induces eddy currents in the rotor. This eddy current field produces a braking torque on the rotor, the value of which is related to the magnitude of the excitation current (controlled by a selector) and the rotor speed. The disadvantages of eddy current retarders are their large size, heavy weight, high power consumption, and significant influence from the ambient temperature. Currently, they are only suitable for large commercial vehicles.

[0005] Existing vehicles are in urgent need of a new retarder product that can solve the defects of the above-mentioned hydraulic retarder and electric turbine retarder, so as to improve the safety of vehicle driving. Summary of the Invention

[0006] The first object of the present invention is to provide a cylindrical liquid-cooled permanent magnet retarder; the second object of the present invention is to provide a vehicle.

[0007] In order to achieve the above-mentioned first purpose, the present invention provides a cylinder-type liquid-cooled permanent magnet retarder, which includes: a stator assembly, a magnetic thrust bearing, a rotor assembly and a driving device; the stator assembly includes a metal cylinder sleeve and an end cover; the magnetic thrust bearing includes a bearing outer ring and a bearing inner ring; the rotor assembly includes a key shaft, a key sleeve and a permanent magnet; the key sleeve includes a bearing mounting cavity, a magnet mounting groove is provided on the outer periphery of the key sleeve, and the permanent magnet is installed in the magnet mounting groove; the bearing outer ring or the bearing inner ring is installed in the bearing mounting cavity; the key sleeve is sleeved on the key shaft; the driving device is installed on the end cover of the stator assembly, and the driving shaft of the driving device is connected to the corresponding bearing inner ring or bearing outer ring.

[0008] The present invention is a cylindrical liquid-cooled permanent magnet retarder as described above, further, the stator assembly includes a metal cylindrical sleeve, an end cover, a guide sleeve, a guide rod and an inner ring bracket; the end cover is a disc structure, one side of the end cover is connected to the end of the metal cylindrical sleeve, and the other side of the end cover is installed with the drive device and the guide sleeve; one end of the guide rod is vertically connected to the inner ring bracket, and the other end is assembled in the guide sleeve; the inner ring bracket is an annular flange structure, connected between the drive shaft of the drive device and the inner ring of the magnetic bearing.

[0009] The cylindrical liquid-cooled permanent magnet retarder of the present invention as described above, further, the metal cylindrical sleeve is a hollow double-layer cylindrical structure, with a cold water cavity provided therein, and the metal cylindrical sleeve includes a water inlet hole and a water outlet hole connected to the water cooling cavity; the stator assembly also includes a pipe joint assembly connected to the water hole position.

[0010] The cylindrical liquid-cooled permanent magnet retarder of the present invention as described above is further provided with a temperature sensor for detecting the temperature of the liquid in the pipe; the pipe joint assembly includes a water inlet joint and a water outlet joint, the water inlet joint is connected to the cold water outlet pipe of the cooling system, and the water outlet joint is connected to the hot water inlet pipe of the cooling system; the temperature sensor is connected to the controller signal of the cooling system, and the controller of the cooling system adjusts the circulation speed of the coolant in the cooling system according to the temperature value.

[0011] The cylindrical liquid-cooled permanent magnet retarder of the present invention as described above, further, the key sleeve of the rotor assembly includes an outer ring, an inner ring and a side wall connecting the outer ring and the inner ring; the inner circle of the inner ring is a spline or a flat key, the outer periphery of the outer ring is provided with a magnet mounting groove, and the inner periphery of the outer ring is installed with the outer ring of the magnetic bearing.

[0012] The present invention is a cylindrical liquid-cooled permanent magnet retarder as described above, further, the driving device is a cylinder assembly, the cylinder assembly is composed of a cylinder, a piston rod, a displacement sensor, and a connecting plate; the cylinder is connected to the end cover of the stator assembly through the connecting plate; the piston rod is connected to the inner ring bracket, the fixed part of the displacement sensor is connected to the cylinder, and the movable part of the displacement sensor is connected to the piston rod through the support plate.

[0013] The present invention is a cylindrical liquid-cooled permanent magnet retarder as described above, further, the bearing outer ring includes a pressure plate, a first magnetic steel splicing ring, a partition, a second magnetic steel splicing ring and a pad; the first magnetic steel splicing ring is arranged between the pressure plate and the partition, and the second magnetic steel splicing ring is arranged between the partition and the pad; the magnets of the first magnetic steel splicing ring and the second magnetic steel splicing ring are arranged in opposite directions of magnetic poles.

[0014] The present invention is a cylindrical liquid-cooled permanent magnet retarder as described above, further, the bearing inner ring includes a pressure plate, a first magnetic steel splicing ring, a partition, a second magnetic steel splicing ring and a pad; the first magnetic steel splicing ring is arranged between the pressure plate and the partition, and the second magnetic steel splicing ring is arranged between the partition and the pad; the magnets of the first magnetic steel splicing ring and the second magnetic steel splicing ring are arranged in opposite directions of magnetic poles.

[0015] The cylindrical liquid-cooled permanent magnet retarder provided by the present invention utilizes the magnetic eddy current braking force of the stator assembly and rotor assembly for braking. The magnitude of the braking force depends on the axial dimension of the rotor assembly's permanent magnets penetrating the metal sleeve of the stator assembly. The retarder responds quickly to deceleration commands, and the entire retarder does not require additional energy from the outside world to operate normally, thereby saving energy and reducing emissions. Furthermore, due to the use of thrust magnetic bearings, the outer ring and inner ring of the bearing are connected radially without contact, generating tension in the axial direction. This axial force pulls the permanent magnets axially. When the bearing rotates, the inner and outer rings do not contact each other, resulting in no friction, no wear, and no overheating damage. This greatly increases the service life of the bearing and reduces the number of repairs and maintenance required for the permanent magnet retarder.

[0016] In order to achieve the above second purpose, the present invention provides a vehicle, which includes a rotating shaft and any one of the above described cylindrical liquid-cooled permanent magnet retarder, and the rotating shaft is connected to the key shaft of the rotor assembly.

[0017] In the vehicle described above, the rotating shaft is further configured as a power transmission shaft or a wheel drive shaft of an automobile.

[0018] The aforementioned vehicle, equipped with a cylindrical liquid-cooled permanent magnet retarder, overcomes the long lag time associated with the engagement and disengagement of hydraulic retarders, enabling immediate response to deceleration commands and improving vehicle safety. It also overcomes the power loss associated with inoperative hydraulic retarders and the energy consumption associated with eddy current retarders, achieving energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or other advantages of the present invention will become more clear and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein:

[0020] Figure 1 This is a schematic diagram of a cylindrical liquid-cooled permanent magnet retarder according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of a cylindrical liquid-cooled permanent magnet retarder according to an embodiment of the present invention;

[0022] Figure 3 This is a partially enlarged schematic cross-sectional view of a cylindrical liquid-cooled permanent magnet retarder according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of a stator assembly according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of a pipe joint assembly according to an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a rotor assembly according to an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a key shaft according to an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of a key cover according to an embodiment of the present invention;

[0028] Figure 9 A schematic diagram of a cylinder assembly according to an embodiment of the present invention;

[0029] Figure 10 A schematic diagram of a magnetic thrust bearing according to an embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of a bearing outer ring according to an embodiment of the present invention.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] 100, mounting plate; 200, stator assembly, 201, metal sleeve, 202, end cover, 203, guide sleeve, 204, inner ring bracket, 205, guide rod, 206, cold water chamber; 300, pipe joint assembly, 301, temperature sensor, 302, water outlet joint, 303, sealing ring; 400, drive unit, 401, displacement sensor, 402, cylinder, 403, connecting plate, 404, support plate, 405, drive shaft; 500, magnetic push Force bearing, 510, bearing outer ring, 511, pressure plate, 512, first magnetic steel splicing ring, 513, partition, 514, pad, 520, bearing inner ring; 600, rotor assembly, 601, magnetic shielding cylinder, 602, permanent magnet, 603, key sleeve, 6031, outer ring, 6032, side wall, 6033, inner ring, 6034, inner spline, 604, magnet baffle, 605, key shaft, 6051, outer spline, 6052, flange, 606, pressure block. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of a cylinder-type liquid-cooled permanent magnet retarder and a vehicle including the retarder according to the present invention will be described with reference to the accompanying drawings.

[0034] The embodiments described herein are specific embodiments of the present invention and are used to illustrate the concept of the present invention. They are illustrative and exemplary and should not be construed as limiting the embodiments and scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the disclosure of the specification, including technical solutions that adopt any obvious substitutions and modifications to the embodiments described herein.

[0035] The drawings in this specification are schematic diagrams that assist in illustrating the concepts of the present invention and schematically illustrate the shapes of the various components and their interrelationships. Please note that to clearly illustrate the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0036] Figure 1 、 Figure 2 and Figure 3 A cylindrical liquid-cooled permanent magnet retarder according to an embodiment of the present invention is shown, which includes: a stator assembly 200, a magnetic thrust bearing 500, a rotor assembly 600 and a driving device 400;

[0037] The stator assembly 200 includes a metal sleeve 201 and an end cover 202;

[0038] The magnetic thrust bearing 500 includes a bearing outer ring 510 and a bearing inner ring 520;

[0039] like Figure 6 As shown, the rotor assembly 600 includes a key shaft 605, a key sleeve 603 and a permanent magnet 602; the key sleeve 603 includes a bearing mounting cavity, and a magnet mounting groove is provided on the outer periphery of the key sleeve 603, and the permanent magnet 602 is installed in the magnet mounting groove; the bearing outer ring 510 or the bearing inner ring 520 is installed in the bearing mounting cavity; the key sleeve 603 is sleeved on the key shaft 605;

[0040] The driving device 400 is mounted on the end cover 202 of the stator assembly 200 , and the driving shaft 405 of the driving device 400 is connected to the corresponding bearing inner ring 520 or bearing outer ring 510 .

[0041] The magnetic thrust bearing 500 can be installed in two ways: the bearing outer ring 510 is installed in the bearing mounting cavity; the key sleeve 603 is mounted on the key shaft 605; and the drive shaft 405 of the drive device 400 is connected to the corresponding bearing inner ring 520. Alternatively, the bearing inner ring 520 is installed in the bearing mounting cavity; the key sleeve 603 is mounted on the key shaft 605; and the drive shaft 405 of the drive device 400 is connected to the corresponding bearing outer ring 510.

[0042] In the above embodiment, the rotor assembly's multiple permanent magnets are arranged in a cylindrical shape, with adjacent permanent magnets' poles positioned in opposite directions and capable of axial movement. The stator assembly's metal sleeve is a cylindrical carbon steel structure that accommodates the cylindrical permanent magnets, with a certain gap between the sleeve and the outer wall, allowing the rotor assembly's magnets to move axially within the sleeve. By varying the length of the rotor assembly's magnets inserted into the sleeve, the torque between the stator and rotor assemblies at a given speed is altered, thereby varying the retarder's braking state.

[0043] The rotatable portion of the magnetic bearing (e.g., the outer ring 510) is fixed within the key sleeve 603, including the bearing mounting cavity, and rotates with the rotor. The axially movable portion of the magnetic bearing (e.g., the inner ring 520) is connected to the drive shaft 405 of the drive device. The air gap between the outer ring 510 and the inner ring 520 ensures contactless relative rotation between the inner and outer rings. The axial attraction between the inner and outer rings ensures that the inner ring drives the axial movement of the outer ring. The magnetic thrust bearing meets both axial load requirements and the high-speed rotation of the rotor, achieving performance requirements that mechanical bearings cannot achieve.

[0044] In addition, as an alternative to magnetic bearings, the inventors designed a retarder with the following structure during the research and development process: the rotor assembly's key sleeve and drive unit are connected by a deep groove ball bearing. The inner ring of the deep groove ball bearing is mounted on the key sleeve, and the outer ring is connected to the drive unit. The deep groove ball bearing drives the axial movement of the key sleeve. Due to the high rotor speed and large bearing inner diameter, the linear velocity of the bearing during rotation is very high, making it difficult for deep groove ball bearings to meet high speed requirements. Furthermore, due to the axial forces (friction, axial suction, etc.) that must be overcome during axial movement of the rotor, deep groove ball bearings also cannot meet axial load requirements. Therefore, the bearing service life is severely reduced. If the bearing is damaged and the rotation is blocked, the outer ring will rotate with the inner ring, causing the cylinder to be twisted.

[0045] The present invention is as above the cylindrical liquid cooling permanent magnet retarder, such as Figure 4As shown, the stator assembly 200 includes a metal sleeve 201, an end cap 202, a guide sleeve 203, a guide rod 205, and an inner ring support 204. The end cap 202 is a disc-shaped structure, connected to the end of the metal sleeve 201 on one side, and the drive unit 400 and guide sleeve 203 are mounted on the other side. The guide rod 205 is perpendicularly connected to the inner ring support 204 at one end and assembled within the guide sleeve 203 at the other end. The inner ring support 204 is an annular flange structure, connected between the drive shaft 405 of the drive unit 400 and the inner ring 520 of the magnetic bearing. In one specific embodiment, the guide sleeve is an embedded flange sleeve with self-lubrication function, which guides the guide rod. The number of wire sleeves and guide rods is determined based on the load conditions of the inner ring support. The guide sleeves are preferably arranged symmetrically, for example, symmetrically along the diameter of the end cap to balance the load. The guide rod is a rod-type structure, one end of which is screwed into the inner ring bracket in the form of a screw, and the other end is installed in the guide sleeve and can slide in the sleeve to radially center the inner ring bracket and guide the axial movement of the inner ring bracket.

[0046] The present invention is as above the cylindrical liquid cooling permanent magnet retarder, such as Figure 1 、 Figure 4 and Figure 5 As shown, the metal sleeve 201 is a hollow, double-layered cylindrical structure with a cooling water chamber 206. The sleeve 201 includes a water inlet and outlet that communicate with the cooling water chamber. The stator assembly 200 also includes a pipe joint assembly 300 connected to the water outlet. Liquid cooling is used for high efficiency and effectiveness. The cylindrical stator is a hollow sleeve structure, filled with water. Heat is released through the cooling system to maintain a normal operating temperature for the structure.

[0047] like Figure 5 As shown, the pipe joint assembly 300 is provided with a temperature sensor 301 for detecting the temperature of the liquid in the pipe. The pipe joint assembly 300 includes a water inlet joint and a water outlet joint 302. The water inlet joint is connected to the cold water outlet pipe of the cooling system, and the water outlet joint 302 is connected to the hot water inlet pipe of the cooling system; the temperature sensor 301 is connected to the controller signal of the cooling system. The controller of the cooling system adjusts the circulation speed of the coolant in the cooling system according to the temperature value, further improving the heat dissipation effect of the cylindrical stator. Figure 5 In the illustrated embodiment, a water outlet joint is shown. The water outlet joint is an elbow structure. A flange and a sealing ring 303 are provided at the position where the metal sleeve is connected. The sealing ring can improve the sealing performance of the connection position and prevent leakage of the coolant.

[0048] The present invention is as above the cylindrical liquid cooling permanent magnet retarder, such as Figure 8As shown, the key sleeve 603 of the rotor assembly 600 includes an outer ring 6031, an inner ring 6033 and a side wall 6032 connecting the outer ring and the inner ring; the inner circle of the inner ring is an inner spline 6034, and the outer periphery of the outer ring is provided with a magnet mounting groove, in which the permanent magnet is mounted, and the adjacent permanent magnets are spaced apart by a pressing block 606, and the end of the magnet mounting groove is shielded by a magnet baffle 604 to prevent the permanent magnet from shifting; the inner periphery of the outer ring is provided with a magnetic bearing outer ring 510. The key sleeve of the above structure realizes the triple functions of magnet mounting, magnetic bearing mounting and connection with the key shaft through a single part. At the same time, the inner ring of the magnetic bearing connected to the drive device is also provided in the bearing mounting cavity, and the key sleeve provides a mounting space for the inner ring of the magnetic bearing to ensure the positional correspondence between the inner ring of the magnetic bearing and the outer ring of the magnetic bearing.

[0049] The present invention is as above the cylindrical liquid cooling permanent magnet retarder, such as Figure 7 As shown, the key shaft 605 is a sleeve-type structure with a flange 6052 , which is flange-connected to the output shaft of the gearbox and is connected to the key sleeve 603 via an outer spline 6051 .

[0050] In the above-mentioned cylindrical liquid-cooled permanent magnet retarder, since there is a magnetic field around the permanent magnet 602, even if the permanent magnet does not enter the metal sleeve, the rotor assembly will generate torque with the stator assembly, resulting in a waste of kinetic energy. In a further preferred cylindrical liquid-cooled permanent magnet retarder, the rotor assembly 600 further includes a magnetic shielding cylinder 601 of a cylindrical structure, which is sleeved around the permanent magnet 602 in the non-working area. The magnetic shielding cylinder prevents the suction force generated by magnetic leakage and avoids generating braking force when the retarder is not in operation.

[0051] The present invention is as above the cylindrical liquid cooling permanent magnet retarder, such as Figure 9 As shown, the drive device 400 is a cylinder assembly consisting of a cylinder 402, a piston rod, a displacement sensor 401, and a connecting plate 403. Cylinder 402 is connected to the end cap 202 of stator assembly 200 via connecting plate 403. The piston rod is connected to the inner ring bracket 204. The fixed portion of displacement sensor 401 is connected to cylinder 402, and the movable portion of displacement sensor 401 is connected to the piston rod via support plate 404. Alternatively, the drive device 400 is a motor drive assembly, comprising a motor, a screw, and a drive slider. The motor output shaft is connected to one end of the screw, and the drive slider is connected to the inner ring bracket 204. The rotation of the screw drives the inner ring bracket 204 along the screw axis. The advantage of using a motor drive assembly is that the permanent magnet moves more quickly within the metal sleeve, avoiding the long response time of a cylinder.

[0052] In order to facilitate the installation of the cylindrical liquid-cooled permanent magnet retarder to the power mechanism or transmission mechanism of the vehicle, the cylindrical liquid-cooled permanent magnet retarder also includes a mounting plate 100, one side of which is connected to the metal cylindrical sleeve 201 of the stator assembly 200, and the other side of the mounting plate 100 is used to connect a mechanical structure provided with a rotating shaft.

[0053] The present invention is as above the cylindrical liquid cooling permanent magnet retarder, such as Figure 10 and Figure 11 As shown, the bearing outer ring 510 includes a pressure plate 511, a first magnetic steel splicing ring 512, a partition 513, a second magnetic steel splicing ring and a pad 514; the first magnetic steel splicing ring 512 is arranged between the pressure plate 511 and the partition 513, and the second magnetic steel splicing ring is arranged between the partition 513 and the pad 514; the magnets of the first magnetic steel splicing ring 512 and the second magnetic steel splicing ring are arranged in opposite directions of magnetic poles. The use of the pressure plate, partition and pad not only enhances the magnetic capacity, but also integrates the outer ring of the magnetic bearing for easy assembly. In a specific embodiment, the pressure plate, partition and pad are all aluminum alloy annular thin plate structures.

[0054] The bearing inner ring 520 includes a pressure plate 511, a first magnetic steel splicing ring 512, a partition 513, a second magnetic steel splicing ring and a pad 514; the first magnetic steel splicing ring 512 is arranged between the pressure plate 511 and the partition 513, and the second magnetic steel splicing ring is arranged between the partition 513 and the pad 514; the magnets of the first magnetic steel splicing ring 512 and the second magnetic steel splicing ring are arranged in opposite directions of magnetic poles.

[0055] The inventors of the present invention have applied the above-described cylindrical liquid-cooled permanent magnet retarder to vehicles, such as large trucks and buses, achieving excellent vehicle deceleration and maintaining both braking and driving safety. The vehicle comprises a rotating shaft and any of the above-described cylindrical liquid-cooled permanent magnet retarders. The rotating shaft is connected to a key shaft 605 of a rotor assembly 600. For example, the rotating shaft can be a power transmission shaft or a wheel drive shaft 405 of a vehicle.

[0056] The working process of the cylindrical liquid-cooled permanent magnet retarder of the above embodiment of the present invention is as follows:

[0057] 1. When the retarder is in the non-working position, the cylinder drive shaft is in the extended state, pushing the inner ring of the magnetic bearing forward. The axial thrust of the magnetic bearing drives the outer ring of the magnetic bearing, the key sleeve, the permanent magnet, etc. to move synchronously, and all enter the magnetic shielding cylinder, without generating a deceleration torque.

[0058] 2. When the vehicle needs to slow down, the retarder activates by simply controlling the extension of the cylinder drive shaft. As the piston rod's extension decreases, the cylinder pulls the inner ring of the magnetic bearing, which in turn drives the key sleeve and permanent magnet, via the outer ring, out of the magnetic shield and into the water jacket conductor cavity. As the length of entry increases, the water jacket exerts a gradually increasing torsional torque on the permanent magnet, achieving braking. When the permanent magnet is fully within the water jacket conductor cavity, the braking torque reaches its maximum.

[0059] 3. When the retarder needs to stop working or reduce the braking torque, the drive shaft should be converted from the retracted state to the extended state, and the key sleeve and permanent magnet should be pushed from the water jacket into the magnetic shielding cylinder. The longer the pushing distance, the smaller the braking torque. When the retarder is completely out of the water jacket conductor cavity and enters the magnetic shielding cylinder, no braking torque is generated and the retarder stops working.

[0060] The cylindrical liquid-cooled permanent magnetic retarder of the present invention overcomes the shortcoming of high power consumption of eddy current retarder. The magnetic field is provided by high-performance NdFeB permanent magnets, and no power supply is required, thus saving power. The cylindrical structure can better overcome the axial force, and is small in size and has a wide range of applications. The cylindrical liquid-cooled permanent magnetic retarder is provided with a water-cooling chamber inside the stator, which is cooled by water circulation; it can effectively reduce the temperature of the rotor and stator, reduce thermal decay, and can continuously provide braking torque, resulting in better braking effect. Due to the use of magnetic thrust bearings, the contact rigid mechanical structure bearings are transformed into contactless flexible magnetic bearings, which solves the damage to the mechanical bearings caused by high-speed and high-thrust working conditions, increases the service life of the bearings, and not only provides convenience for customers, but also brings economic benefits.

[0061] The technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A cylindrical liquid-cooled permanent magnet retarder, characterized in that: include: A stator assembly, a magnetic thrust bearing, a rotor assembly and a driving device; the stator assembly includes a metal sleeve and an end cover; the magnetic thrust bearing includes a bearing outer ring and a bearing inner ring; the rotor assembly includes a key shaft, a key sleeve and a permanent magnet; the key sleeve includes a bearing mounting cavity, a magnet mounting groove is arranged on the periphery of the key sleeve, and the permanent magnet is mounted in the magnet mounting groove; the bearing outer ring or the bearing inner ring is mounted in the bearing mounting cavity; the key sleeve is sleeved on the key shaft; the driving device is mounted on the end cover of the stator assembly, and the driving shaft of the driving device is connected to the corresponding bearing inner ring or bearing outer ring; The rotor assembly also includes a magnetic field-avoiding cylinder of a cylindrical structure, which is sleeved around the permanent magnet in the non-working area; The stator assembly comprises a metal sleeve, an end cover, a guide sleeve, a guide rod and an inner ring bracket; the end cover is a disc structure, one side of the end cover is connected to the end of the metal sleeve, and the other side of the end cover is installed with the drive device and the guide sleeve; one end of the guide rod is vertically connected to the inner ring bracket, and the other end is assembled in the guide sleeve; the inner ring bracket is an annular flange structure, connected between the drive shaft of the drive device and the inner ring of the bearing; The key sleeve of the rotor assembly includes an outer ring, an inner ring and a side wall connecting the outer ring and the inner ring; the inner circle of the inner ring is a spline or a flat key, the outer circumference of the outer ring is provided with a magnet mounting groove, and the inner circumference of the outer ring is installed with a bearing outer ring.

2. The cylindrical liquid-cooled permanent magnet retarder according to claim 1 is characterized in that: The metal sleeve is a hollow double-layered sleeve structure with a cold water cavity inside. The metal sleeve includes a water inlet and a water outlet connected to the water cooling cavity. The stator assembly also includes a pipe joint assembly connected to the water hole.

3. The cylindrical liquid-cooled permanent magnet retarder according to claim 2 is characterized in that: The pipe joint assembly is provided with a temperature sensor for detecting the temperature of the liquid in the pipe; the pipe joint assembly includes a water inlet joint and a water outlet joint, the water inlet joint is connected to the cold water outlet pipe of the cooling system, and the water outlet joint is connected to the hot water inlet pipe of the cooling system; the temperature sensor is connected to the controller signal of the cooling system, and the controller of the cooling system adjusts the circulation speed of the coolant in the cooling system according to the temperature value.

4. The cylindrical liquid-cooled permanent magnet retarder according to claim 1 is characterized in that: The driving device is a cylinder assembly, which consists of a cylinder, a piston rod, a displacement sensor, and a connecting plate; the cylinder is connected to the end cover of the stator assembly through the connecting plate; the piston rod is connected to the inner ring bracket, the fixed part of the displacement sensor is connected to the cylinder, and the movable part of the displacement sensor is connected to the piston rod through the supporting plate.

5. The cylindrical liquid-cooled permanent magnet retarder according to claim 1 is characterized in that: The bearing outer ring includes a pressure plate, a first magnetic steel splicing ring, a partition, a second magnetic steel splicing ring and a pad; the first magnetic steel splicing ring is arranged between the pressure plate and the partition, and the second magnetic steel splicing ring is arranged between the partition and the pad; the magnetic steels of the first magnetic steel splicing ring and the second magnetic steel splicing ring are arranged in opposite directions of magnetic poles.

6. The cylindrical liquid-cooled permanent magnet retarder according to claim 1 is characterized in that: The bearing inner ring includes a pressure plate, a first magnetic steel splicing ring, a partition, a second magnetic steel splicing ring and a pad; the first magnetic steel splicing ring is arranged between the pressure plate and the partition, and the second magnetic steel splicing ring is arranged between the partition and the pad; the magnetic steels of the first magnetic steel splicing ring and the second magnetic steel splicing ring are arranged in opposite directions of magnetic poles.

7. A vehicle, comprising a rotating shaft and the cylinder-type liquid-cooled permanent magnet retarder according to any one of claims 1 to 6, wherein the rotating shaft is connected to a key shaft of a rotor assembly.

8. The vehicle according to claim 7, characterized in that: The rotating shaft is a power transmission shaft or a wheel driving shaft of the automobile.

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