Loading System and Pump Retarder

Abstract

The present invention provides a loading system and a pump type retarder, relating to the technical field of vehicle retarders. A loading system provided by the present invention is used for a pump type retarder. The pump type retarder includes a housing and a rotor. A cavity is provided inside the housing, and a magnetorheological fluid is filled in the cavity. The rotor is arranged inside the cavity and divides the cavity into a high-pressure chamber and a low-pressure chamber. The loading system includes: a storage tank, a control pump, a magnetic field generating member, and a relief valve. The relief valve and the control pump are used to control the communication between the high-pressure chamber and the low-pressure chamber. The magnetic field generating member is arranged at the liquid outlet and can generate a magnetic field. By providing a control pump, a relief valve, and an electromagnetic coil, and filling the magnetorheological fluid as a working medium inside the cavity, the pressure inside the cavity can be closed-loop controlled, the torque of the rotor can be controlled in real time, functions such as long slope retardation and anti-lock braking can be achieved, and the reaction speed is fast and the efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle retarders, and in particular to a loading system and a pump-type retarder. Background Art

[0002] Due to the numerous intersections, dense bus stops, and large passenger flow on urban roads, buses often need to brake frequently; mountain roads are steep and have many sharp turns, and medium and large-sized freight trucks and buses traveling on mountain sections for a long time also often need to brake.

[0003] When the brake works frequently for a long time, it will cause rapid wear of the brake shoes, shorten the service life of the brake friction pads, and cause the loss of braking force or a significant decline in braking performance due to brake fade, which also becomes one of the main causes of traffic accidents. Therefore, it is very necessary to equip an auxiliary braking system.

[0004] As an auxiliary braking component of a vehicle, a retarder reduces the load on the original vehicle's braking system by acting on the original vehicle's transmission system, decelerates the vehicle evenly, improves the reliability of the vehicle's braking system, extends the service life of the braking system, and can significantly reduce the use cost of the vehicle.

[0005] Currently, the main types of retarders include hydraulic retarders, etc. Among them, hydraulic retarders at least have the disadvantages of relatively large volume, relatively slow reaction speed, insufficient low-speed braking force, and large no-load loss. Summary of the Invention

[0006] (1) The problems to be solved by the present invention are: the relatively slow reaction speed and large no-load loss of the existing hydraulic retarder.

[0007] (2) Technical Solution

[0008] To solve the above technical problems, an embodiment of the present invention provides a loading system for a pump-type retarder. The pump-type retarder includes a housing and a rotor. A cavity is provided in the housing, and the cavity is filled with magnetorheological fluid. The rotor is disposed in the cavity and can stir the magnetorheological fluid. The rotor divides the cavity into a high-pressure chamber and a low-pressure chamber. The housing is also provided with a liquid inlet and a liquid outlet that communicate with the cavity;

[0009] The loading system includes: a storage tank, a control pump, a magnetic field generator, a relief valve, and a first pipeline;

[0010] Both ends of the first pipeline are respectively communicated with the high-pressure chamber and the low-pressure chamber. The relief valve is disposed on the first pipeline and is used to control the on-off of the first pipeline; the input port of the control pump is connected to the storage tank, the output port of the control pump is connected to the control port of the relief valve, and controls the opening degree of the relief valve; the magnetic field generator is disposed at the liquid outlet;

[0011] When the loading system is loading, the control pump controls the opening of the unloading valve to decrease, and the magnetic field generating component generates a magnetic field.

[0012] According to an embodiment of the present invention, further, the magnetic field generating component is an electromagnetic coil;

[0013] The loading system further includes a second pipeline, one end of the second pipeline is communicated with the liquid outlet, and the other end is communicated with the storage tank;

[0014] The electromagnetic coil is wound around the outer side wall of the second pipeline.

[0015] According to an embodiment of the present invention, further, the housing includes a plurality of connecting parts, and all the connecting parts are connected to form the housing;

[0016] A permanent magnet is provided at the connection part of two of the connecting parts for sealing.

[0017] According to an embodiment of the present invention, further, a third pipeline and a control valve are further included;

[0018] A first communication port communicated with the cavity is provided on the housing;

[0019] One end of the third pipeline is communicated with the first communication port, the other end is communicated with the air, the control valve is arranged on the third pipeline, and controls the on-off of the third pipeline.

[0020] According to an embodiment of the present invention, further, the control valve is an electromagnetic valve.

[0021] According to an embodiment of the present invention, further, a first check valve is further included;

[0022] The first check valve is arranged between the control pump and the liquid inlet, the inlet of the first check valve is communicated with the output port of the control pump, and the outlet of the first check valve is communicated with the liquid inlet.

[0023] According to an embodiment of the present invention, further, the first check valve has two inlets;

[0024] One of the inlets is a control port, the control port of the first check valve is communicated with the output port of the control pump, the control pump controls the opening of the first check valve, and the other inlet is communicated with the storage tank.

[0025] According to an embodiment of the present invention, further, a second communication port is provided on the storage tank;

[0026] The loading system further includes a fourth pipeline and a second check valve;

[0027] One end of the fourth pipeline is communicated with the storage tank, and the other end is communicated with the outside;

[0028] The second check valve is arranged on the fourth pipeline, and the gas in the storage tank can be discharged through the second check valve.

[0029] According to an embodiment of the present invention, further, the control pump is connected to the housing.

[0030] Another embodiment of the present invention further provides a pump type retarder, including the loading system described in any one of the above embodiments.

[0031] Advantages of the present invention:

[0032] A loading system provided by the present invention includes: a loading system for a pump type retarder. The pump type retarder includes a housing and a rotor. A cavity is provided in the housing, and the cavity is filled with magnetorheological fluid. The rotor is arranged in the cavity and can stir the magnetorheological fluid. The rotor divides the cavity into a high-pressure cavity and a low-pressure cavity. The housing is also provided with a liquid inlet and a liquid outlet communicated with the cavity; the loading system includes: a storage tank, a control pump, a magnetic field generating member, a relief valve and a first pipeline; both ends of the first pipeline are respectively communicated with the high-pressure cavity and the low-pressure cavity. The relief valve is arranged on the first pipeline and is used to control the on-off of the first pipeline; the input port of the control pump is connected to the storage tank, and the output port of the control pump is connected to the control port of the relief valve and controls the opening degree of the relief valve; the magnetic field generating member is arranged at the liquid outlet; when the loading system is loading, the control pump controls the opening degree of the relief valve to decrease, and the magnetic field generating member generates a magnetic field.

[0033] By setting a control pump, a relief valve and an electromagnetic coil, and at the same time filling the cavity with magnetorheological fluid as a working medium, the pressure in the cavity can be closed-loop controlled, the torque of the rotor can be controlled in real time, functions such as long slope retardation and anti-lock can be realized, and the reaction speed is fast and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the loading system provided by the embodiment of the present invention.

[0036] Icon: 100 - pump type retarder; 110 - housing; 111 - high-pressure cavity; 112 - low-pressure cavity; 120 - rotor;

[0037] 210 - Storage box; 220 - Control pump; 230 - Magnetic field generator; 240 - Relief valve; 250 - Control valve; 260 - First check valve; 270 - Second check valve; 281 - First pipeline; 282 - Second pipeline; 283 - Third pipeline; 284 - Fourth pipeline. Detailed implementation manners

[0038] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] An embodiment of the present invention provides a loading system for controlling the pump type retarder 100 to enter the loading state.

[0042] Among them, the pump type retarder 100 in the present application is connected to a vehicle, specifically, connected to the vehicle's transmission system, drive system or vehicle for deceleration.

[0043] As Figure 1 shown, the pump type retarder 100 includes a housing 110 and a rotor 120.

[0044] A cavity for the rotor 120 to operate is provided inside the housing 110, and the cavity is filled with magnetorheological fluid. The rotor 120 is disposed inside the cavity and is connected to the vehicle's transmission system or other structures, and the vehicle can drive the rotor 120 to rotate. When the rotor 120 rotates, it can stir the magnetorheological fluid inside the cavity. At the same time, the rotor 120 divides the cavity into a high-pressure chamber 111 and a low-pressure chamber 112, and the housing 110 is also provided with a liquid inlet and a liquid outlet communicating with the cavity.

[0045] Among them, magnetorheological fluid is a new type of fluid with controllable fluidity and is an active branch in the research of intelligent materials. It exhibits the characteristics of a Newtonian fluid with low viscosity in the absence of an external magnetic field. It exhibits the characteristics of a Bingham fluid with high viscosity and low fluidity under an applied magnetic field. There is a corresponding relationship between the viscosity of the liquid and the magnetic flux.

[0046] In actual use, the retarder has two states.

[0047] One state is the loading state. The cavity of the retarder is closed to the outside world, and at the same time, the cavity is filled with magnetorheological fluid. At the same time, the high-pressure chamber 111 and the low-pressure chamber 112 are disconnected. There is a pressure difference between the high-pressure chamber 111 and the low-pressure chamber 112. When the rotor 120 stirs the magnetorheological fluid, the magnetorheological fluid has damping on the rotor 120, realizing the retardation function.

[0048] Another state is the no-load unloading state. At this time, the high-pressure chamber 111 and the low-pressure chamber 112 are connected, and air is introduced at the same time. A pressure difference cannot be established between the high-pressure chamber 111 and the low-pressure chamber 112, and the magnetorheological fluid cannot generate damping on the rotor 120.

[0049] The loading system provided in this embodiment, as Figure 1 shown, includes: a storage tank 210 (for storing magnetorheological fluid), a control pump 220, a magnetic field generator 230, a relief valve 240, and a first pipeline 281;

[0050] Both ends of the first pipeline 281 are respectively communicated with the high-pressure chamber 111 and the low-pressure chamber 112. The relief valve 240 is disposed on the first pipeline 281 and is used to control the on-off of the first pipeline 281. The input port of the control pump 220 is connected to the storage tank 210, and the output port of the control pump 220 is connected to the control port of the relief valve 240, and controls the opening degree of the relief valve 240, and controls the flow rate of the first pipeline 281 by controlling the opening degree of the relief valve 240. The magnetic field generator 230 is disposed at the liquid outlet. When the magnetic field generator 230 starts to work, a magnetic field is generated at the liquid outlet, and the magnetorheological fluid is affected by the magnetic field, and its viscosity becomes larger and it cannot flow at the liquid outlet.

[0051] When the loading system performs a loading operation, the magnetic field generating member 230 starts to work, generating a magnetic field at the liquid outlet, increasing the viscosity of the magnetorheological fluid, reducing its fluidity, and increasing the resistance during discharge. The control pump 220 controls the reduction of the opening degree of the unloading valve 240 (according to the actual situation, when a smaller torque is required, the opening degree of the unloading valve 240 can be reduced; when a larger torque is required, the unloading valve 240 can be directly closed), controls the flow rate of the first pipeline 281, forms a pressure difference, so that the magnetorheological fluid can generate damping on the rotor 120, and then generates a braking torque.

[0052] In this embodiment, by controlling the pump 220, the unloading valve 240, and the magnetorheological fluid medium filled in the cooperation cavity of the magnetic field generating member 230, auxiliary main braking is realized, which has a rapid response, precise control, is practical and reliable. At the same time, it can be controlled in real time to achieve anti-lock braking.

[0053] In this embodiment, the unloading valve 240 includes a valve body, the valve body forms a receiving cavity, a piston is arranged in the receiving cavity, and the piston can slide along the extending direction of the receiving cavity. One end of the receiving cavity is provided with a control port, the control port is communicated with the output port of the control pump 220, and the other end of the receiving cavity is provided with a compression spring.

[0054] By pumping the magnetorheological fluid into the control port through the control pump 220, the piston can be pushed to slide in the receiving cavity, thereby realizing the control of the opening degree of the unloading valve 240.

[0055] As Figure 1 shown, in this embodiment, the magnetic field generating member 230 is an electromagnetic coil.

[0056] The loading system further includes a second pipeline 282. One end of the second pipeline 282 is communicated with the liquid outlet, and the other end is communicated with the storage tank 210. The electromagnetic coil is wound around the outer side wall of the second pipeline 282. When the electromagnetic coil is energized, a magnetic field is generated in the second pipeline 282, increasing the viscosity of the magnetorheological fluid, reducing its fluidity, and increasing the resistance during discharge.

[0057] Optionally, in this embodiment, the loading system further includes a controller, the controller controls the energization and de-energization of the electromagnetic coil. At the same time, the electromagnetic coil is connected to the vehicle power supply, and the vehicle power supply supplies power to the electromagnetic coil.

[0058] In this embodiment, the housing 110 includes a plurality of connecting parts, and all the connecting parts are connected to form the housing 110. A permanent magnet is arranged at the connection position of two connecting parts. At the permanent magnet, the viscosity of the magnetorheological fluid increases and the fluidity becomes poor, which can improve the sealing effect.

[0059] In this embodiment, the connecting part includes structures such as the housing of the pump type retarder 100 and the end cover.

[0060] In this embodiment, as Figure 1 shown, the loading system further includes a third pipeline 283 and a control valve 250. A first communication port for communicating the cavity with the atmosphere is provided on the housing 110, so that external air can enter the cavity to achieve rapid unloading.

[0061] Specifically, one end of the third pipeline 283 is communicated with the first communication port, and the other end is communicated with the outside. The control valve 250 is arranged on the third pipeline 283 and controls the on-off of the third pipeline 283.

[0062] When the loading system is loading, the control valve 250 also controls the third pipeline 283 to be cut off to form a sealed cavity.

[0063] In actual use, the control valve 250 is a solenoid valve, which has a simple structure, rapid response and convenient control.

[0064] The loading system provided in this embodiment, as Figure 1 shown, further includes a first check valve 260. The first check valve 260 is arranged between the control pump 220 and the liquid inlet, and the inlet of the first check valve 260 is communicated with the output port of the control pump 220, and the outlet of the first check valve 260 is communicated with the liquid inlet.

[0065] The control pump 220 can control the opening degree of the first check valve 260. Specifically, when the loading system is loading, the control pump 220 controls the first check valve 260 to open, and the magnetorheological fluid in the storage tank 210 can enter the cavity.

[0066] In actual use, as Figure 1 shown, the first check valve 260 has two inlets. One of the inlets is a control port. The output port of the control pump 220 is communicated with the control port of the first check valve 260 and controls the opening degree of the first check valve 260, and the other inlet is communicated with the storage tank 210.

[0067] Specifically, when the loading system is loading, the control pump 220 starts to pressurize and controls the first check valve 260 to open. At this time, since the vehicle drives the rotor 120 to rotate, the rotor 120 rotates and sucks the magnetorheological fluid into the cavity through the other interface of the first check valve 260.

[0068] In this embodiment, as Figure 1 shown, the storage tank 210 is provided with a second communication port for communicating the outside and the inside of the storage tank 210.

[0069] Specifically, the loading system further includes a fourth pipeline 284 and a second check valve 270. One end of the fourth pipeline 284 communicates with the storage tank 210, and the other end communicates with the outside; the second check valve 270 is arranged on the fourth pipeline 284, and the gas in the storage tank 210 can be discharged through the second check valve 270.

[0070] Since there is a large amount of air in the cavity of the pump type retarder 100 when it is unloaded, and when loading is required, the second control valve 250 and the unloading valve 240 are closed, and the cavity is sealed. During the process of sucking the magnetorheological fluid into the cavity, the air needs to be discharged.

[0071] In actual use, the air is discharged from the liquid outlet and flows into the storage tank 210 along the pipeline. By setting the second communication port, all the air entering the storage tank 210 can be discharged. At the same time, a second check valve 270 is arranged at the second communication port to prevent foreign impurities from entering the storage tank 210 and polluting the magnetorheological fluid in the storage tank 210.

[0072] Another embodiment of the present invention further provides a pump type retarder 100, including the loading system described in the above embodiment.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A loading system, characterized in that, for a pump type retarder (100), the pump type retarder (100) includes a housing (110) and a rotor (120), a cavity is provided in the housing (110), the cavity is filled with magnetorheological fluid, the rotor (120) is arranged in the cavity and can stir the magnetorheological fluid, the rotor (120) divides the cavity into a high-pressure chamber (111) and a low-pressure chamber (112), and the housing (110) is further provided with a liquid inlet and a liquid outlet communicating with the cavity; The loading system includes: a storage tank (210), a control pump (220), a magnetic field generating member (230), a relief valve (240) and a first pipeline (281); Both ends of the first pipeline (281) are respectively communicated with the high-pressure chamber (111) and the low-pressure chamber (112), the relief valve (240) is arranged on the first pipeline (281) and is used to control the on-off of the first pipeline (281); the input port of the control pump (220) is connected with the storage tank (210), the output port of the control pump (220) is connected with the control port of the relief valve (240) and controls the opening degree of the relief valve (240); the magnetic field generating member (230) is arranged at the liquid outlet; When the loading system is loading, the control pump (220) controls the reduction of the opening degree of the relief valve (240), and the magnetic field generating member (230) generates a magnetic field.

2. The loading system according to claim 1, characterized in that, The magnetic field generating member (230) is an electromagnetic coil; The loading system further includes a second pipeline (282), one end of the second pipeline (282) is communicated with the liquid outlet, and the other end is communicated with the storage tank (210); The electromagnetic coil is wound on the outer side wall of the second pipeline (282).

3. The loading system according to claim 1, characterized in that, The housing (110) includes a plurality of connecting parts, and all the connecting parts are connected to form the housing (110); A permanent magnet is provided at the connection part of two connecting parts for sealing.

4. The loading system according to claim 1, characterized in that, It further includes a third pipeline (283) and a control valve (250); The housing (110) is provided with a first communication port communicating with the cavity; One end of the third pipeline (283) is communicated with the first communication port, and the other end is communicated with the air, the control valve (250) is arranged on the third pipeline (283) and controls the on-off of the third pipeline (283).

5. The loading system according to claim 4, characterized in that, The control valve (250) is an electromagnetic valve.

6. The loading system according to claim 1, characterized in that, It further includes a first check valve (260); The first check valve (260) is arranged between the control pump (220) and the liquid inlet, and the inlet of the first check valve (260) is communicated with the output port of the control pump (220), and the outlet of the first check valve (260) is communicated with the liquid inlet.

7. The loading system according to claim 6, wherein, the first check valve (260) has two inlets; one of the inlets is a control port, the control port of the first check valve (260) is communicated with the output port of the control pump (220), and the control pump (220) controls the opening degree of the first check valve (260), and the other inlet is communicated with the storage tank (210).

8. The loading system according to claim 1, wherein, a second communication port is provided on the storage tank (210); the loading system further includes a fourth pipeline (284) and a second check valve (270); one end of the fourth pipeline (284) is communicated with the storage tank (210), and the other end is communicated with the outside; the second check valve (270) is arranged on the fourth pipeline (284), and the gas in the storage tank (210) can be discharged through the second check valve (270).

9. The loading system according to claim 1, wherein, the control pump (220) is connected to the housing (110).

10. A pump type retarder, wherein, it includes the loading system according to any one of claims 1 to 9.

Images