Trailer retarder with auxiliary driving function

Abstract

The invention relates to the technical field of electric braking systems, and discloses a trailer retarder with an auxiliary driving function, the trailer retarder comprises a retarder shell, a transmission shaft and a retarder rotor set, the retarder rotor set comprises a first rotor, a magnetic shield and a second rotor, and a first permanent magnet and a second permanent magnet are attached to the outer side and the inner side of the retarder rotor set respectively; a first stator is arranged on the inner side of the retarder shell, a second stator is fixed to the retarder shell through bolts, the magnetic isolation sleeve is provided with protrusions and grooves, the protrusions of the magnetic isolation sleeve are embedded into the grooves of the first rotor, the protrusions of the second rotor are embedded into the grooves of the magnetic isolation sleeve, an inner stator is arranged outside the transmission shaft, and a stator winding is wound on the inner stator. In the starting or accelerating running process, alternating current is introduced into the stator winding, the auxiliary driving function can be achieved, the output torque of the transmission shaft is increased, and extra driving torque is provided for the trailer, so that the trailer can be started and accelerated more quickly and more stably, and the running performance is improved.

Description

Technical Field

[0001] The present invention relates to the field of electric brake systems, and more particularly to a trailer retarder with auxiliary driving function. Background Art

[0002] With the expansion of the global and Chinese trailer markets, the development of industries such as logistics, and the improvement of vehicle braking and safety requirements, the market demand for eddy current retarders continues to grow, especially in the field of new energy vehicles. Its high efficiency, energy saving, contactless braking and energy recovery are in line with the concept of energy conservation and environmental protection, and its application prospects are broad. The main excitation methods of eddy current retarders are permanent magnet excitation and excitation coil excitation. The working principle of eddy current retarders is based on electromagnetic induction and eddy current effect.

[0003] When the stator coil is energized to generate a magnetic field, the rotor rotates with the drive shaft, cutting the magnetic lines of force generated by the stator, thereby generating a vortex-shaped induced current inside the rotor disk. When the eddy current flows inside the rotor disk with a certain resistance, the thermal effect of the resistance will convert the electrical energy into thermal energy. The stator will apply an electromagnetic force to the rotor to hinder the rotation of the rotor, thereby generating a braking torque. The kinetic energy of the vehicle is finally converted into heat energy and dissipated through electromagnetic induction and resistance heating. However, in some cases, the trailer may need additional power support when starting or accelerating, especially when climbing, descending, and when the load is heavy. During the braking and auxiliary driving process, there may be problems of insufficient braking torque and insufficient auxiliary driving. To this end, we propose a trailer retarder with auxiliary driving function. Summary of the invention

[0004] The present invention provides a trailer retarder with an auxiliary driving function, which solves the technical problem in the related art that insufficient braking torque and insufficient auxiliary driving may occur during braking and auxiliary driving.

[0005] The present invention provides a trailer retarder with an auxiliary driving function, comprising a retarder housing, a transmission shaft and a retarder rotor group, wherein the transmission shaft passes through the center of the retarder housing, a cylinder is arranged on the side wall of the retarder housing, the retarder rotor group comprises a first rotor, a magnetic isolation sleeve and a second rotor, a first permanent magnet and a second permanent magnet are respectively attached to the outer side and the inner side of the retarder rotor group, a first stator is arranged on the inner side of the retarder housing, a second stator is fixed to the retarder housing by bolts, a magnetic isolation sleeve is provided with a protrusion and a groove, the protrusion of the magnetic isolation sleeve is embedded in the groove of the first rotor, the protrusion of the second rotor is embedded in the groove of the magnetic isolation sleeve, an inner stator is arranged on the outer side of the transmission shaft, and a stator winding is wound on the inner stator; An alternating current is introduced into the stator winding, and the stator winding interacts with the first permanent magnet and the second permanent magnet to increase the output torque of the transmission shaft; The stator winding is not energized, and the two cylinders push the first rotor and the second rotor to move axially, so that the first permanent magnet coincides with the first stator, and the second permanent magnet coincides with the second stator. The first stator and the second stator cut the magnetic flux lines generated by the permanent magnets to generate a braking torque.

[0006] Furthermore, the stator winding and the inner stator are embedded in the retarder rotor assembly, and the first stator and the second stator are not placed overlapping with the retarder rotor assembly.

[0007] Furthermore, the retarder housing is divided into a first area and a second area, the first stator and the second stator are located in the first area, and the retarder rotor assembly is located in the second area.

[0008] Furthermore, a cooling water channel is opened inside the wall plate of the retarder housing, four oil spray nozzles are fixedly arranged on the surface of the retarder housing, and an oil return pipe is arranged at the bottom of the retarder housing to realize dual cooling of water cooling and oil cooling.

[0009] Furthermore, the cooling water channel is connected to the cooling system of the vehicle through the cooling water pipeline and the oil return pipeline is connected to the cooling oil pipeline through the cooling oil pipeline to form a cooling loop.

[0010] Furthermore, water injection into the cooling water channel is a conventional water cooling method. When the temperature inside the retarder housing is too high, the fuel injector starts to spray oil, and the temperature is lowered by water cooling and oil cooling to prevent demagnetization of the permanent magnet.

[0011] Furthermore, a roller bearing is provided on the contact surface between the transmission shaft and the inner stator, and a ball bearing is provided on the contact end between the transmission shaft and the retarder housing.

[0012] Furthermore, a water inlet end of the cooling water channel is provided with a water inlet fixedly connected to the retarder housing, and a water outlet end of the cooling water channel is provided with a water outlet fixedly connected to the retarder housing.

[0013] The beneficial effects of the present invention are: During the starting or accelerating process, the present invention can realize the auxiliary driving function by passing AC into the stator winding, increase the output torque of the transmission shaft, and provide additional driving torque for the trailer, which helps the trailer to start and accelerate faster and more smoothly, and improves the driving performance; During the braking process, the stator winding is not energized, and the cylinder drives the first rotor and the second rotor to move axially, so that the permanent magnet overlaps with the stator, cutting the magnetic lines of force to generate a braking torque. This design makes the braking process more efficient and faster, and the braking torque is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the trailer retarder of the present invention in an inactive state; Figure 2is a side cross-sectional view of the second region of the trailer retarder of the present invention in an unactivated state; Figure 3 It is a schematic diagram of the working state of the trailer retarder of the present invention; Figure 4 It is a side cross-sectional view of the first area of ​​the trailer retarder in the working state of the present invention.

[0015] In the figure: 11, retarder housing; 12, cooling water channel; 13, first stator; 14, fuel injector; 15, first permanent magnet; 16, first rotor; 17, transmission shaft; 18, inner stator; 19, roller bearing; 20, ball bearing; 21, stator winding; 22, second permanent magnet; 23, magnetic isolation sleeve; 24, second rotor; 25, oil return pipe; 26, second stator; 27, cylinder; 32, water inlet; 33, water outlet. DETAILED DESCRIPTION

[0016] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0017] like Figure 1 and Figure 2 As shown, a trailer retarder with auxiliary driving function comprises a retarder housing 11, a transmission shaft 17 and a retarder rotor assembly, wherein the transmission shaft 17 passes through the center of the retarder housing 11, and a cylinder 27 is arranged on the side wall of the retarder housing 11. The retarder housing 11 serves as a supporting base of the overall structure, and its surface is designed with grooves and fitting areas for installing specific components; The retarder rotor group includes a first rotor 16, a magnetic shielding sleeve 23 and a second rotor 24. The first permanent magnet 15 and the second permanent magnet 22 are respectively attached to the outer side and the inner side of the retarder rotor group. The first stator 13 is arranged on the inner side of the retarder housing 11. The second stator 26 is fixed to the retarder housing 11 by bolts. The magnetic shielding sleeve 23 is provided with a protrusion and a groove. The protrusion of the magnetic shielding sleeve 23 is embedded in the groove of the first rotor 16, and the protrusion of the second rotor 24 is embedded in the groove of the magnetic shielding sleeve 23. The outer side of the transmission shaft 17 is provided with an inner stator 18, and the inner stator 18 is wound with a stator winding 21. The first rotor 16 is designed with a groove inside, which is used to cooperate with the protrusion of the magnetic isolation sleeve 23 to form a tight connection. The magnetic isolation sleeve 23 is a key component for magnetic circuit isolation, and its surface has both protrusions and grooves. The protrusion is embedded in the groove of the first rotor 16, and its own groove is used to receive the protrusion of the second rotor 24, ensuring the stability of the retarder rotor group and the isolation of the magnetic circuit. The protrusion of the second rotor 24 is tightly embedded in the groove of the magnetic isolation sleeve 23, and together with the first rotor 16 and the magnetic isolation sleeve 23, it forms a complete retarder rotor group structure; When the retarder is applied to a trailer vehicle, during driving, AC is supplied to the stator winding 21, and the stator winding 21 interacts with the first permanent magnet 15 and the second permanent magnet 22 to increase the output torque of the transmission shaft 17; The first permanent magnet 15 is directly attached to the outer side of the retarder rotor group, that is, the outer surface of the first rotor 16, to provide the necessary magnetic field to support the retarding mechanism, and the second permanent magnet 22 is attached to the inner side of the retarder rotor group, that is, the inner surface of the second rotor 24, and works in conjunction with the first permanent magnet 15 to enhance the magnetic field effect; The inner stator 18 is located inside the retarder, and is surrounded by a stator winding 21, which is a key component for converting electrical energy into mechanical energy. The stator winding 21 is tightly wound in an angle on the inner stator 18, and is responsible for generating or responding to changes in the magnetic field to achieve the retarding function; The second stator 26 is directly fixed to the retarder housing 11 by bolts, and is used to further enhance or adjust the magnetic field, or serve as an additional supporting structure.

[0018] During the braking process of the trailer, the stator winding 21 is not energized, and the two cylinders 27 push the first rotor 16 and the second rotor 24 to move axially, so that the first permanent magnet 15 overlaps with the first stator 13, and the second permanent magnet 22 overlaps with the second stator 26. The first stator 13 and the second stator 26 cut the magnetic flux lines generated by the permanent magnets to generate a braking torque.

[0019] The stator winding 21 and the inner stator 18 are embedded in the retarder rotor assembly, and the first stator 13 and the second stator 26 are placed without overlapping with the retarder rotor assembly.

[0020] The magnetic isolation sleeve 23 is provided with protrusions and grooves, and the first stator 13 is specially provided with a protrusion structure on the outside, and these protrusions are precisely embedded in the grooves preset in the retarder housing 11, ensuring that the first stator 13 is firmly installed and accurately positioned; like Figure 1 , Figure 3 and Figure 4 As shown, the retarder housing 11 is divided into a first area and a second area, the first stator 13 and the second stator 26 are located in the first area, and the retarder rotor assembly is located in the second area.

[0021] A cooling water channel 12 is provided inside the wall plate of the retarder housing 11, four oil spray nozzles 14 are fixedly provided on the surface of the retarder housing 11, and an oil return pipe 25 is provided at the bottom of the retarder housing 11 to achieve dual cooling of water cooling and oil cooling.

[0022] The cooling water channel 12 is connected to the cooling system of the vehicle through a cooling water pipeline and the oil return pipeline 25 is connected to the cooling system of the vehicle through a cooling oil pipeline to form a cooling loop.

[0023] The water injection of the cooling water channel 12 is a conventional water cooling method. When the temperature inside the retarder housing 11 is too high, the oil injector 14 starts to spray oil to reduce the temperature by water cooling and oil cooling to prevent the permanent magnet from demagnetizing.

[0024] A roller bearing 19 is provided on the contact surface between the transmission shaft 17 and the inner stator 18 , and a ball bearing 20 is provided on the contact end between the transmission shaft 17 and the retarder housing 11 .

[0025] The water inlet end of the cooling water channel 12 is provided with a water inlet 32 ​​fixedly connected to the retarder housing 11 , and the water outlet end of the cooling water channel 12 is provided with a water outlet 33 fixedly connected to the retarder housing 11 .

[0026] Start-up and preparation stage: When the trailer is ready to start or accelerate, the retarder is in a standby state. At this time, the stator winding 21 is not energized, the first rotor 16 and the second rotor 24 remain stationary at the initial position of the cylinder 27, the first permanent magnet 15 and the second permanent magnet 22 maintain a certain gap with the first stator 13 and the second stator 26 respectively, the cooling water channel 12 of the retarder housing 11 has been connected to the cooling system of the vehicle, ready for water cooling circulation, and at the same time, the oil injector 14 is in a standby state, ready for oil cooling assistance at any time; Auxiliary drive stage - starting or accelerating: the driver starts the trailer and passes AC into the stator winding 21. The AC interacts with the permanent magnet to generate electromagnetic force, which acts on the transmission shaft 17 to increase its output torque. The generation of electromagnetic force enables the trailer to obtain additional driving torque, which helps the vehicle to start or accelerate faster and more smoothly. During this process, the water cooling system continues to work to ensure that the temperature of the retarder remains within a safe range; Normal driving stage: During normal driving of the trailer, the stator winding 21 may continue to be energized to provide a stable auxiliary driving torque, or it may be powered off according to driving requirements, and the cooling system continues to work to monitor and adjust the temperature of the retarder to ensure that the permanent magnet is not demagnetized due to overheating; Braking stage: When the trailer needs to brake, the driver sends a braking signal. At this time, the stator winding 21 is powered off, and the cylinder 27 starts to work, driving the first rotor 16 and the second rotor 24 to move axially. The first permanent magnet 15 overlaps with the first stator 13, and the second permanent magnet 22 overlaps with the second stator 26. In this process, the first stator 13 and the second stator 26 cut the magnetic flux lines generated by the permanent magnets, and a braking torque is generated according to the principle of electromagnetic induction. The braking torque is transmitted to the wheels through the transmission shaft 17 to slow down the vehicle. At the same time, according to the temperature of the retarder, the fuel injector 14 may start to spray oil, and the temperature is further reduced by oil cooling. During the entire braking process, the water cooling and oil cooling systems work together to ensure that the temperature of the retarder is always controlled within a safe range; Braking end and cooling stage: When the trailer stops completely or slows down to a safe speed, the braking process ends. At this time, the cylinder 27 may continue to work for a period of time to ensure that the first rotor 16 and the second rotor 24 are completely reset, and the cooling system continues to work for a period of time to dissipate the heat generated by the retarder during the braking process. Then, the entire retarder system enters the standby state and waits for the next start or braking command.

[0027] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A trailer retarder with an auxiliary driving function, comprising a retarder housing (11), a transmission shaft (17) and a retarder rotor assembly, wherein the transmission shaft (17) passes through the center of the retarder housing (11), and a cylinder (27) is provided on the side wall of the retarder housing (11), characterized in that: The retarder rotor assembly comprises a first rotor (16), a magnetic shielding sleeve (23) and a second rotor (24); the first permanent magnet (15) and the second permanent magnet (22) are respectively attached to the outer side and the inner side of the retarder rotor assembly; the first stator (13) is arranged on the inner side of the retarder housing (11); the second stator (26) is fixed to the retarder housing (11) by bolts; the magnetic shielding sleeve (23) is provided with a protrusion and a groove; the protrusion of the magnetic shielding sleeve (23) is embedded in the groove of the first rotor (16); the protrusion of the second rotor (24) is embedded in the groove of the magnetic shielding sleeve (23); the outer side of the transmission shaft (17) is provided with an inner stator (18); the inner stator (18) is wound with a stator winding (21); Alternating current is introduced into the stator winding (21), and the stator winding (21) interacts with the first permanent magnet (15) and the second permanent magnet (22) to increase the output torque of the transmission shaft (17); The stator winding (21) is not energized, and the two cylinders (27) push the first rotor (16) and the second rotor (24) to move axially, so that the first permanent magnet (15) overlaps with the first stator (13), and the second permanent magnet (22) overlaps with the second stator (26), and the first stator (13) and the second stator (26) cut the magnetic flux lines generated by the permanent magnets, thereby generating a braking torque.

2. The trailer retarder with auxiliary driving function according to claim 1, characterized in that: The stator winding (21) and the inner stator (18) are embedded in the retarder rotor assembly, and the first stator (13) and the second stator (26) are placed non-overlappingly with the retarder rotor assembly.

3. The trailer retarder with auxiliary driving function according to claim 1, characterized in that: The retarder housing (11) is divided into a first area and a second area, the first stator (13) and the second stator (26) are located in the first area, and the retarder rotor assembly is located in the second area.

4. The trailer retarder with auxiliary driving function according to claim 1, characterized in that: A cooling water channel (12) is provided inside the wall plate of the retarder housing (11), four oil spray nozzles (14) are fixedly provided on the surface of the retarder housing (11), and an oil return pipe (25) is provided at the bottom of the retarder housing (11), thereby realizing dual cooling of water cooling and oil cooling.

5. The trailer retarder with auxiliary driving function according to claim 4, characterized in that: The cooling water channel (12) is connected to the cooling system of the vehicle via a cooling water pipeline and the oil return pipeline (25) is connected to the cooling oil pipeline via a cooling oil pipeline to form a cooling loop.

6. The trailer retarder with auxiliary driving function according to claim 5, characterized in that: The water injection of the cooling water channel (12) is a conventional water cooling method. When the temperature inside the retarder housing (11) is too high, the oil injection nozzle (14) starts to spray oil, and the temperature is lowered by water cooling and oil cooling to prevent the permanent magnet from demagnetizing.

7. The trailer retarder with auxiliary driving function according to claim 1, characterized in that: The contact surface between the transmission shaft (17) and the inner stator (18) is provided with a roller bearing (19), and the contact end between the transmission shaft (17) and the retarder housing (11) is provided with a ball bearing (20).

8. The trailer retarder with auxiliary driving function according to claim 6, characterized in that: The water inlet end of the cooling water channel (12) is provided with a water inlet (32) fixedly connected to the retarder housing (11), and the water outlet end of the cooling water channel (12) is provided with a water outlet (33) fixedly connected to the retarder housing (11).

Images