Hydraulic retarder control oil circuit

Abstract

The present application relates to the technical field of vehicle auxiliary braking, and particularly relates to a hydraulic retarder control oil circuit. The hydraulic retarder control oil circuit includes: a stator-rotor cavity provided with a first outlet and a first inlet; a first control valve disposed at the first outlet; a second control valve disposed at the first inlet; an oil storage cavity, with the first control valve and the second control valve respectively connected to the oil storage cavity; an oil supply pump having at least a pump oil port and a first oil outlet, the pump oil port being connected to the oil storage cavity; a heat exchange device including a second inlet and a second outlet; the first oil outlet is connected to the second inlet, and the second outlet is connected to the second control valve. The hydraulic retarder control oil circuit provided by the present application can achieve multiple control logics, has high control precision, stable performance, strong versatility, and the product components used in this hydraulic retarder control oil circuit are few, and the oil circuit is simple, which not only reduces the overall weight of this hydraulic retarder control oil circuit, but also reduces the raw material and processing costs.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle auxiliary braking, and particularly to a hydraulic retarder control oil circuit. Background Art

[0002] At present, there are generally two conventional retarder control principles on the market: the first is the air-over-liquid structure, which has low control accuracy and unstable performance; the second is a retarder whose internal structure is connected to the gearbox and the oil participates in the internal circulation of the gearbox. This structure is used in combination with a special gearbox, has poor versatility, and uses a control form of an ordinary solenoid valve + valve rod structure. Although the control structure of this retarder has high accuracy, it is too complex, and the raw material usage cost and processing cost are both high. Summary of the Invention

[0003] The purpose of the present application is to provide a hydraulic retarder control oil circuit to solve, to a certain extent, the technical problems in the prior art that the existing retarder oil circuit has low accuracy, unstable performance, and complex structure with poor versatility.

[0004] The present application provides a hydraulic retarder control oil circuit, including: a stator-rotor cavity provided with a first outlet and a first inlet;

[0005] A first control valve disposed at the first outlet;

[0006] A second control valve disposed at the first inlet;

[0007] An oil storage cavity, the first control valve and the second control valve are respectively connected to the oil storage cavity;

[0008] An oil supply pump provided with at least a pump oil port and a first oil outlet, the pump oil port is connected to the oil storage cavity;

[0009] A heat exchange device including a second inlet and a second outlet; the first oil outlet is connected to the second inlet, and the second outlet is connected to the second control valve.

[0010] In the above technical solution, further, the first control valve includes: a first valve position and a second valve position. When the first control valve is in the off state, the first outlet is communicated with the oil storage cavity through the first valve position; when the first control valve is in the on state, the first outlet is communicated with the second inlet through the second valve position.

[0011] In any of the above technical solutions, further, the second control valve includes: a third valve position and a fourth valve position. When the second control valve is in the off state, the second outlet communicates with the oil storage cavity through the third valve position; when the second control valve is in the on state, the second outlet communicates with the first inlet through the fourth valve position.

[0012] In any of the above technical solutions, further, the hydraulic retarder control oil circuit further includes a piston loading cavity, a piston is arranged in the piston loading cavity, and the piston is connected to the rotor; a third inlet and a third outlet are arranged in the piston loading cavity;

[0013] The oil supply pump is further provided with a second oil outlet, and the second oil outlet is connected to the third inlet; the third outlet is connected to the oil storage cavity.

[0014] In any of the above technical solutions, further, the hydraulic retarder control oil circuit further includes:

[0015] A first valve, the first valve is connected to the first control valve and the second control valve, and the first valve is used to control the closing or opening of the first control valve and the second control valve;

[0016] A second valve, the second valve is connected to the piston loading cavity and is used to control the pressurization or depressurization of the piston loading cavity.

[0017] In any of the above technical solutions, further, the oil supply pump is provided with a balance cavity, and the balance cavity is connected to the oil storage cavity;

[0018] The hydraulic retarder control oil circuit further includes a third valve, and the third valve is arranged between the balance cavity and the oil storage cavity.

[0019] In any of the above technical solutions, further, the oil storage cavity is provided with a total oil outlet, and the total oil outlet is connected to the pump oil port;

[0020] A filter element is arranged at the total oil outlet;

[0021] An overflow assembly is arranged between the total oil outlet and the pump oil port.

[0022] In any of the above technical solutions, further, the first valve, the second valve and the third valve are all solenoid valves.

[0023] In any of the above technical solutions, further, the hydraulic retarder control oil circuit further includes a pressure detection device, and the pressure detection device is arranged at the first oil outlet and the second oil outlet.

[0024] In any of the above technical solutions, further, the hydraulic retarder control oil circuit further includes a check valve, and the check valve is disposed between the first control valve and the oil storage chamber.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows:

[0026] The hydraulic retarder control oil circuit provided by the present application includes: a stator-rotor cavity, the stator-rotor cavity is provided with a first outlet and a first inlet; a first control valve, disposed at the first outlet; a second control valve, disposed at the first inlet; an oil storage chamber, the first control valve and the second control valve are respectively connected to the oil storage chamber; an oil supply pump, at least provided with an oil pumping port and a first oil outlet, the oil pumping port is connected to the oil storage chamber; a heat exchange device, including a second inlet and a second outlet; the first oil outlet is connected to the second inlet, and the second outlet is connected to the second control valve.

[0027] The hydraulic retarder control oil circuit provided by the present application adjusts and controls the on-off and working conditions of the oil circuit through the cooperation between each valve and the oil supply pump, can implement a variety of control logics, has higher control accuracy compared with traditional control methods such as air-over-liquid, makes the performance of the vehicle braking system more stable, and the hydraulic retarder control oil circuit of the present application does not participate in the oil circulation of the vehicle gearbox, does not need to cooperate with a specific type and model of gearbox, has stronger versatility, is applicable to a variety of vehicle models, has a wide application range and high practicability. And the product components used in the hydraulic retarder control oil circuit of the present application are few, the oil circuit is simple, which not only reduces the overall weight of the hydraulic retarder control oil circuit, but also reduces the raw material and processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic diagram of the no-load oil circuit of the hydraulic retarder control oil circuit provided by the embodiment of the present application;

[0030] Figure 2 It is a schematic diagram of the upshift oil circuit of the hydraulic retarder control oil circuit provided by the embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the downshift oil circuit of the hydraulic retarder control oil circuit provided by the embodiment of the present application.

[0032] Reference Numerals:

[0033] 1 - Oil storage cavity, 2 - Fuel supply pump, 201 - Balance cavity, 202 - Fuel pumping port, 203 - First oil outlet, 204 - Second oil outlet, 3 - First control valve, 301 - First valve position, 302 - Second valve position, 4 - Second control valve, 401 - Third valve position, 402 - Fourth valve position, 5 - Heat exchange device, 501 - Second inlet, 502 - Second outlet, 6 - First valve, 601 - Fifth cavity, 602 - Sixth cavity, 7 - Second valve, 701 - Third cavity, 702 - Fourth cavity, 8 - Third valve, 801 - First cavity, 802 - Second cavity, 9 - Piston loading cavity, 901 - Third inlet, 902 - Third outlet, 10 - Check valve, 11 - Rotor - stator cavity, 1101 - First outlet, 1102 - First inlet, 12 - Filter element, 13 - Overflow pipe, 14 - Relief valve. Detailed implementation manners

[0034] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0035] The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0036] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0037] In the description of the present application, it should be noted that 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, and is only for the convenience of describing the present application 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 thus cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0039] The following refers to Figures 1 to 3 Describe the hydraulic retarder control oil circuit according to the embodiments of the present application.

[0040] See Figures 1 to 3 As shown, the embodiments of the present application provide a hydraulic retarder control oil circuit including: an oil storage chamber 1, an oil supply pump 2, a stator-rotor, a first control valve 3, a second control valve 4, a heat exchange device 5, a first valve 6, a second valve 7, a third valve 8, and a piston loading chamber 9. The stator-rotor includes a stator-rotor chamber 11 (which can also be regarded as the working chamber of the stator-rotor). The oil supply pump 2 is used to pump hydraulic oil into the stator-rotor chamber 11. By adjusting the amount of hydraulic oil pumped into the stator-rotor chamber 11 or discharging the hydraulic oil in the stator-rotor chamber 11, the hydraulic retarder can be upshifted, downshifted, or in an unloaded state.

[0041] Specifically, the oil storage chamber 1 is used to store hydraulic oil, and the oil storage chamber 1 is provided with a total oil outlet, and a filter element 12 is provided at the total oil outlet to filter the hydraulic oil flowing out through the total oil outlet to prevent impurities from flowing into the oil circuit.

[0042] Furthermore, the oil supply pump 2 is preferably a variable pump. The pump body of the oil supply pump 2 is provided with an oil pumping port 202, a first oil outlet 203, and a second oil outlet 204. The oil pumping port 202 is connected to the oil storage chamber 1 through a pipeline so that under the action of the pump body, the hydraulic oil in the oil storage chamber 1 can be pumped into the pump body. The first oil outlet 203 is connected to the heat exchange device 5, and the second oil outlet 204 is connected to the piston loading chamber 9 through a pipeline.

[0043] Preferably, an overflow assembly is provided between the filter element 12 and the oil pumping port 202 of the oil supply pump 2. The overflow assembly includes an overflow pipe 13 and an overflow valve 14 provided on the overflow pipe 13. Preferably, the overflow pipe 13 is connected to the oil storage chamber 1. The function of the overflow valve 14 is that after the filter element 12 is blocked due to intercepting more impurities, the oil supply pump 2 can continue to pump oil out of the oil storage chamber 1 through the overflow valve 14, thereby ensuring the normal operation of the entire system.

[0044] Further, the oil supply pump 2 is provided with a balance chamber 201. The balance chamber 201 communicates with the pump body of the oil supply pump 2 and is connected to the third valve 8. Among them, the third valve 8 is preferably a solenoid valve; the third valve 8 includes an independent first cavity 801 and a second cavity 802. When the third valve 8 is powered off, the first cavity 801 communicates with the oil storage chamber 1, and at this time, the second cavity 802 is idle and does not participate in the work. When the third valve 8 is powered on, the second oil outlet 204 communicates with the balance chamber 201 of the oil supply pump 2 through the second cavity 802.

[0045] Further, a piston is arranged in the piston loading chamber 9. The piston is connected to the rotor, and the piston loading chamber 9 is provided with a third inlet 901 and a third outlet 902. The second oil outlet 204 of the oil supply pump 2 is connected to the third inlet 901 through a pipeline, and the third outlet 902 is connected to the oil storage chamber 1 through the second valve 7. The second valve 7 is used to control the pressurization or pressure relief of the piston loading chamber 9. Preferably, the second valve 7 is a solenoid valve. It should be noted that in the embodiment of the present application, the third inlet 901 of the piston loading chamber 9 is always in an open state, and the second valve 7 controls the pressurization or pressure relief of the piston loading chamber 9 by controlling the opening or closing of the third outlet 902. When the pressure in the piston loading chamber 9 rises, the piston will be pushed, so that the piston will push the rotor to the working position. When the pressure in the piston loading chamber 9 drops, the pushing effect on the piston is lost, and the rotor will return to the initial state.

[0046] In this embodiment, further, the piston may not be provided or the piston may be arranged on the rotor so that the piston and the rotor move synchronously. In this case, when the piston loading chamber 9 is pressurized, the rotor can be pushed to the working position. Whether to select the piston and the specific setting method after selection have multiple optional solutions, and all can achieve the same or similar effects. All these solutions should fall within the protection scope required by the present application.

[0047] In addition, in this embodiment, a two-position three-way solenoid valve can also be used to simultaneously control the opening and closing of the third inlet 901 and the third outlet 902 of the piston loading chamber 9, and the pressurization or pressure relief of the piston loading chamber 9 can also be realized.

[0048] The second valve 7 includes a third cavity 701 and a fourth cavity 702. When the second valve 7 is powered off, the piston loading chamber 9 is depressurized, and the hydraulic oil entering the piston loading chamber 9 through the third inlet 901 immediately flows out through the third outlet 902, and the third outlet 902 communicates with the oil storage chamber 1 through the fourth cavity 702. When the second valve 7 is powered on, the piston loading chamber 9 is pressurized, and the internal pressure of the piston loading chamber 9 rises to push the piston, and then the piston pushes the rotor to the working position. At this time, the third outlet 902 communicates with the third cavity 701 of the second valve 7, but the third cavity 701 is in a closed state at this time.

[0049] Further, the stator-rotor cavity 11 is also provided with a first inlet 1102 and a first outlet 1101. The heat exchange device 5 is preferably a plate heat exchanger, and the heat exchange device 5 is provided with a second inlet 501 and a second outlet 502. The first outlet 1101 is connected to the second inlet 501 of the heat exchange device 5 through a first control valve 3, and the first inlet 1102 is connected to the second outlet 502 of the heat exchange device 5 through a second control valve 4. Moreover, the first oil outlet 203 of the oil supply pump 2 is also connected to the second inlet 501 through a pipeline.

[0050] Specifically, the first control valve 3 includes a first valve position 301 and a second valve position 302. When the first control valve 3 is in the off state, the first valve position 301 works and the second valve position 302 is idle. At this time, the first outlet 1101 of the stator-rotor cavity 11 is connected to the oil storage cavity 1, and the hydraulic oil flowing out through the first outlet 1101 flows into the oil storage cavity 1 without circulating into the heat exchange device 5. When the first control valve 3 is in the on state, the first valve position 301 is not connected to the oil storage cavity 1, and the second valve position 302 participates in the oil circuit circulation. The hydraulic oil flowing out through the first outlet 1101 of the stator-rotor cavity 11 flows into the heat exchange device 5 through the second valve position 302.

[0051] Further, the second control valve 4 includes a third valve position 401 and a fourth valve position 402. When the second control valve 4 is in the off state, the third valve position 401 is connected to the oil storage cavity 1, and the fourth valve position 402 does not participate in the oil circuit circulation. The second outlet 502 of the heat exchange device 5 is connected to the oil storage cavity 1 through the third valve position 401, so that the hydraulic oil flowing out through the second outlet 502 flows back to the oil storage cavity 1 and does not continue to participate in the circulation. When the second control valve 4 is in the on state, the third valve position 401 is idle, and the second outlet 502 of the heat exchange device 5 is sequentially connected to the fourth valve position 402 and the first inlet 1102 of the stator-rotor cavity 11 to realize the continuous oil circuit circulation between the stator-rotor cavity 11 and the heat exchange device 5, thereby realizing operations such as upshifting of the retarder.

[0052] Further, the control oil circuit of this hydraulic retarder further includes a first valve 6. The first valve 6 is respectively connected to the first control valve 3 and the second control valve 4, and the first valve 6 is used to control the on-off of the first control valve 3 and the second control valve 4. The first valve 6 is preferably a solenoid valve. The first valve 6 includes independent fifth cavity 601 and sixth cavity 602. When the first valve 6 is powered off, the first control valve 3 and the second control valve 4 are simultaneously turned off, and at this time the sixth cavity 602 is connected to the oil storage cavity 1. When the first valve 6 is powered on, the first control valve 3 and the second control valve 4 are simultaneously turned on, and at this time the first oil outlet 203 of the oil supply pump 2 is connected to the fifth cavity 601 of the first valve 6, so that the stator-rotor cavity 11, the first control valve 3, the heat exchange device 5, and the second control valve 4 jointly form a closed oil circuit.

[0053] More preferably, the first valve 6, the second valve 7 and the third valve 8 are all two-position three-way solenoid valves. When assembling and repairing the oil circuit, there is no need to make targeted distinctions, which simplifies the processing and repair processes and is also beneficial to cost control.

[0054] Furthermore, the hydraulic retarder control oil circuit of the present invention further includes a check valve 10. The check valve 10 is arranged on the oil outlet pipeline of the first valve position 301 of the first control valve 3, and the check valve 10 is located between the first control valve 3 and the oil storage cavity 1 to prevent the hydraulic oil in the oil storage cavity 1 from being sucked back into the stator-rotor cavity 11.

[0055] Furthermore, the hydraulic retarder control oil circuit of the present invention further includes a pressure detection device. The pressure detection device is preferably a pressure sensor, but is not limited thereto. The pressure sensor is arranged at the first oil outlet 203 or the second oil outlet 204 of the oil supply pump 2 for detecting the oil outlet pressure of the oil supply pump 2. It should be noted that the first oil outlet 203 or the second oil outlet 204 is actually divided into two paths through a total oil port. Therefore, when detecting the oil outlet pressure of the oil supply pump 2, the pressure sensor can detect the pressure of the first oil outlet 203 or the second oil outlet 204.

[0056] Preferably, the hydraulic retarder control oil circuit of the present invention further includes a controller. The pressure sensor and the third valve 8 are both connected to the controller. The pressure sensor detects the oil outlet pressure of the oil supply pump 2 and its detection result can reflect the pressure of the entire oil circuit. The controller can control the third valve 8 according to the detection result of the pressure sensor to adjust the oil pumping volume of the oil supply pump 2 so as to adjust the oil outlet pressure of the oil supply pump 2, so that the hydraulic oil volume pumped into the hydraulic retarder control oil circuit can meet the requirements of the hydraulic retarder.

[0057] The hydraulic retarder control oil circuit controls the on-off of the first control valve 3 and the second control valve 4 through the first valve 6, and controls the states of the second valve 7 and the third valve 8, so as to change the entire oil circuit, so that the hydraulic retarder control oil circuit has at least three states: no-load, upshift and downshift. The specific working process of the hydraulic retarder control oil circuit will be described in detail below.

[0058] (1) As Figure 1 shown, when the first valve 6, the second valve 7 and the third valve 8 are all powered off, the first control valve 3 and the second control valve 4 are both disconnected by the first valve 6. At this time, the hydraulic retarder control oil circuit is in the no-load state.

[0059] In the no-load state, the hydraulic oil released by the oil supply pump 2 is divided into two paths and released through the first oil outlet 203 and the second oil outlet 204 respectively. The hydraulic oil flowing out through the second oil outlet 204 flows into the piston loading chamber 9 through the third inlet 901. Since the second valve 7 is powered off at this time, the piston loading chamber 9 is also in a pressure relief state. The hydraulic oil entering the piston loading chamber 9 directly flows back to the oil storage chamber 1 through the third outlet 902 and the fourth chamber 702 and does not participate in the oil circuit circulation. The hydraulic oil flowing out through the first oil outlet 203 flows into the heat exchange device 5 through the second inlet 501 of the heat exchange device 5 and flows out through the second outlet 502 of the heat exchange device 5 and then flows to the second control valve 4. However, since the first valve 6 is powered off at this time, the first control valve 3 and the second control valve 4 are also in a closed state. The hydraulic oil flowing out through the second outlet 502 directly flows back to the oil storage chamber 1 through the third valve position 401 of the second control valve 4.

[0060] After the third valve 8 is powered off, the balance chamber 201 of the oil supply pump 2 is communicated with the oil storage chamber 1 through the first chamber 801 of the third valve 8, so that the hydraulic oil in the balance chamber 201 flows back to the oil storage chamber 1.

[0061] That is to say, in the no-load state, no oil is injected into the stator-rotor chamber 11. In addition, in the no-load state, the first outlet 1101 of the stator-rotor chamber 11 is sequentially communicated with the first valve position 301 of the first control valve 3 and the oil storage chamber 1, so that in the no-load state, not only no oil enters the stator-rotor chamber 11, but also the stator-rotor chamber 11 is in an oil discharge state.

[0062] It should be noted that during the no-load process, there is still hydraulic oil flowing into and out of the oil supply pump 2, and there is also oil flowing into the piston loading chamber 9, which can ensure that there is still oil for lubrication in the oil supply pump 2 and the piston loading chamber 9, avoiding damage caused by the idling of the oil supply pump 2 and the piston loading chamber 9 and affecting the service life.

[0063] And in the no-load state, the oil supply pump 2 provides a small pump volume of hydraulic oil and transports it to the heat exchange device 5 through the first oil outlet 203. The hydraulic oil is returned to the oil storage chamber 1 after being heat-exchanged by the heat exchange device 5. The purpose of such a setting is that even when the control oil circuit of this hydraulic retarder is in the no-load state, there is still a small pump volume of hydraulic oil flowing into the heat exchange device 5, avoiding the no-load of the heat exchange device 5, and further avoiding the generation of air in the heat exchange device 5 and affecting the subsequent heat exchange effect.

[0064] (2) As Figure 2 shown, when the first valve 6, the second valve 7 and the third valve 8 are all powered on, the first valve 6 controls the first control valve 3 and the second control valve 4 to be both opened. At this time, the control oil circuit of this hydraulic retarder is in the upshift state.

[0065] In the upshift state, the hydraulic oil flowing out through the second oil outlet 204 enters the piston loading chamber 9. At this time, the second valve 7 is energized and closed, and the piston loading chamber 9 is pressurized accordingly. Moreover, the second oil outlet 204 continuously pressurizes the piston loading chamber 9, enabling the piston loading chamber 9 to push the piston, which in turn pushes the rotor to the working position, so that the rotor can work and generate torque.

[0066] The hydraulic oil flowing out through the first oil outlet 203 enters the heat exchange device 5 for heat exchange. After the heat exchange is completed, the hydraulic oil flows into the stator-rotor chamber 11 through the second outlet 502, the fourth valve position 402 of the second control valve 4, and the first inlet 1102, thereby increasing the pressure in the stator-rotor chamber 11 to achieve upshifting. At the same time, neither the first control valve 3 nor the second control valve 4 is connected to the oil storage chamber 1. The hydraulic oil in the stator-rotor chamber 11 flows out through the first outlet 1101 and then flows through the second valve position 302 of the first control valve 3 to the second inlet 501 of the heat exchange device 5 for heat exchange again. In this way, a cycle is formed to ensure that there is always heat-exchanged hydraulic oil injected into the stator-rotor chamber 11.

[0067] It should be noted that the oil supply pump 2 is a variable adjustable pump. Most of the hydraulic oil pumped out by the oil supply pump 2 is pumped into the heat exchange device 5 through the first oil outlet 203 for heat exchange and then flows to the stator-rotor chamber 11 and reciprocates between the heat exchange device 5 and the stator-rotor chamber 11 to enable the vehicle to achieve braking. A small part of the hydraulic oil enters the piston loading chamber 9 through the second oil outlet 204 to continuously pressurize the piston loading chamber 9.

[0068] (III) As Figure 3 shown, when the first valve 6 is de-energized, the second valve 7 and the third valve 8 are both energized, and the first control valve 3 and the second control valve 4 are both disconnected, the control oil circuit of this hydraulic retarder is in the downshift state at this time.

[0069] After the upshift of the retarder is completed, it is often necessary to gradually downshift. During the downshift process, the hydraulic oil flowing out through the second oil outlet 204 flows to the piston loading chamber 9, and the second valve 7 is energized, pressurizing the piston loading chamber 9 so that the rotor can work normally. However, at this time, since the first valve 6 is de-energized, the first control valve 3 and the second control valve 4 are both disconnected, which further stops the oil circuit circulation between the heat exchange device 5 and the stator-rotor chamber 11. The hydraulic oil flowing out through the second outlet 502 of the heat exchange device 5 flows back to the oil storage chamber 1 through the third valve position 401 of the second control valve 4, and the hydraulic oil flowing out through the first outlet 1101 of the stator-rotor chamber 11 also flows to the oil storage chamber 1 through the first valve position 301 of the first control valve 3, resulting in no continuous inflow of hydraulic oil into the stator-rotor chamber 11, and the stator-rotor chamber 11 is in the oil discharge state.

[0070] During the upshift and downshift processes, the third valve 8 needs to be powered on. The function of the third valve 8 is to adjust the pump volume of the oil supply pump 2. It should be noted that during the downshift process, it is usually not directly reduced to the lowest level, and downshifting needs to be carried out step by step. During the step-by-step downshift process, the working state of the first valve 6 is to continuously or periodically perform open - close - open - close, and intermittently power on and off in a fluctuating manner, so that the oil discharge process of the stator-rotor cavity 11 is also carried out step by step, in order to achieve multi-gear downshifting.

[0071] After the third valve 8 is powered on, the balance cavity 201 of the oil supply pump 2 is connected to the oil outlet pipeline of the oil supply pump 2 (including the pipeline connecting the first oil outlet 203 and the second oil outlet 204) through the second cavity 802 of the third valve 8, so that the pressure in the balance cavity 201 is balanced with that of the oil outlet pipeline of the oil supply pump 2. At this time, the oil supply pump 2 can reach the maximum pump volume. When the third valve 8 reciprocally alternates to perform the open - close - open... actions, the pump volume of the oil supply pump 2 continuously changes, such as gradually decreasing, so that the amount of hydraulic oil in the entire oil circuit gradually decreases, thereby achieving step-by-step downshifting and significantly improving the control accuracy during the downshift process.

[0072] In summary, the hydraulic retarder control oil circuit provided by this application can adjust and control the on - off and working conditions of the oil circuit through the cooperation between each valve and the oil supply pump, and can achieve various control logics. Compared with traditional control methods such as air-over-liquid, it has higher control accuracy, makes the performance of the vehicle braking system more stable, and this hydraulic retarder control oil circuit does not participate in the oil circulation of the vehicle gearbox, does not need to cooperate with a specific type and model of gearbox, has stronger versatility, is applicable to a variety of vehicle models, has a wide application range and high practicality. And the product components used in this hydraulic retarder control oil circuit are few, the oil circuit is simple, which not only reduces the overall weight of this hydraulic retarder control oil circuit, but also reduces the raw material and processing costs.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this application, not to limit it; although this application 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 recorded 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 this application.

Claims

1. A hydraulic retarder control oil circuit, characterized in that, Comprising: A stator-rotor cavity, which is provided with a first outlet and a first inlet; A first control valve, arranged at the first outlet; A second control valve, arranged at the first inlet; An oil storage cavity, where the first control valve and the second control valve are respectively connected to the oil storage cavity; An oil supply pump, which is at least provided with an oil pumping port and a first oil outlet, and the oil pumping port is connected to the oil storage cavity; A heat exchange device, including a second inlet and a second outlet; the first oil outlet is connected to the second inlet, and the second outlet is connected to the second control valve; The first control valve includes: a first valve position and a second valve position. When the first control valve is in the off state, the first outlet communicates with the oil storage cavity through the first valve position; when the first control valve is in the on state, the first outlet communicates with the second inlet through the second valve position; The second control valve includes: a third valve position and a fourth valve position. When the second control valve is in the off state, the second outlet communicates with the oil storage cavity through the third valve position; when the second control valve is in the on state, the second outlet communicates with the first inlet through the fourth valve position; The hydraulic retarder control oil circuit further includes a piston loading cavity, which is provided with a piston, and the piston is connected to the rotor; the piston loading cavity is provided with a third inlet and a third outlet; The oil supply pump is further provided with a second oil outlet, and the second oil outlet is connected to the third inlet; the third outlet is connected to the oil storage cavity; The hydraulic retarder control oil circuit further includes: A first valve, which is connected to the first control valve and the second control valve, and the first valve is used to control the closing or opening of the first control valve and the second control valve; A second valve, which is connected to the piston loading cavity and is used to control the pressurization or depressurization of the piston loading cavity; The oil supply pump is provided with a balance cavity, and the balance cavity is connected to the oil storage cavity; The hydraulic retarder control oil circuit further includes a third valve, and the third valve is arranged between the balance cavity and the oil storage cavity; The hydraulic retarder control oil circuit has at least three states: an idling state, a gear-up state, and a gear-down state; When the hydraulic retarder control oil circuit is in the idling state, the first valve, the second valve, and the third valve are simultaneously de-energized, and the first valve controls both the first control valve and the second control valve to be off; When the hydraulic retarder control oil circuit is in the gear-up state, the first valve, the second valve, and the third valve are all energized, and the first valve controls both the first control valve and the second control valve to be on; When the hydraulic retarder control oil circuit is in the gear-down state, the first valve is de-energized, the second valve and the third valve are both energized, and both the first control valve and the second control valve are off.

2. The hydraulic retarder control oil circuit according to claim 1, characterized in that, The oil storage cavity is provided with a total oil outlet, and the total oil outlet is connected to the oil pumping port; A filter element is arranged at the total oil outlet; An overflow assembly is arranged between the total oil outlet and the oil pumping port.

3. The hydraulic retarder control oil circuit according to claim 1, characterized in that, The first valve, the second valve, and the third valve are all solenoid valves.

4. The hydraulic retarder control oil circuit according to claim 1, characterized in that The hydraulic retarder control oil circuit further includes a pressure detection device, and the pressure detection device is arranged at the first oil outlet or the second oil outlet.

5. The hydraulic retarder control oil circuit according to any one of claims 1 to 4, characterized in that The hydraulic retarder control oil circuit further includes a check valve, and the check valve is arranged between the first control valve and the oil storage chamber.

Images