Hydraulic system for lubricating oil flow control in three-clutch transmission

Abstract

A hydraulic system for controlling the flow of lubricating oil in a three-clutch transmission, wherein the upstream end oil circuit of the oil pump is connected to the oil tank, the downstream end oil circuit of the oil pump is connected to the main oil circuit, a pressure relief bypass is provided between the downstream end oil circuit of the oil pump and the upstream end oil circuit, a pressure relief valve is provided on the pressure relief bypass for unloading the main oil circuit; the main oil circuit is connected to the first oil outlet channel through the clutch constant oil supply channel, a first throttle valve is provided on the clutch constant oil supply channel, a flow control bypass is provided between the upstream end and the downstream end of the first throttle valve, a first flow control valve is provided on the flow control bypass for controlling the oil outlet flow of the first oil outlet channel; a second flow control valve is provided between the second oil outlet channel and the main oil circuit, the oil inlet end of the second flow control valve is connected to the main oil circuit through the second flow control oil inlet channel, and the oil outlet end of the second flow control valve is connected to the second oil outlet channel through an oil pipe; the third oil outlet channel is connected to the main oil circuit through an oil pipe for lubricating and supplying oil to the shaft gears.

Description

Technical Field

[0001] The invention relates to the field of dual-clutch transmissions, and in particular to a hydraulic system for controlling lubricating oil flow in a triple-clutch transmission. Background Art

[0002] Hybrid power is usually referred to as oil-electric hybrid power, that is, a mixture of fuel (gasoline, diesel, etc.) and electricity. Hybrid vehicles are powered by electric motors as auxiliary power to the engine. As an intermediate product between traditional fuel vehicles and pure electric vehicles, hybrid vehicles are becoming a competitive product for major automakers to develop when pure electric vehicle technology is not yet mature. Hybrid transmissions with three clutches have emerged. The resulting demand for clutch lubrication is also increasing. It is necessary to ensure that there is no ablation when the clutch is working normally, and to improve lubrication efficiency and ensure fuel economy with more precise control. If a single solenoid valve is still used for control, or only mechanical valves are used for logic control, it is difficult to take into account the lubrication and cooling needs of each clutch. Summary of the invention

[0003] The purpose of the present invention is to provide a hydraulic system for lubricating oil flow control of a three-clutch transmission in view of the shortcomings of the existing three-clutch lubricating flow distribution control design, which can effectively and energy-savingly solve the problem of lubricating flow distribution of the three-clutch transmission.

[0004] The object of the present invention is achieved by adopting the following scheme: a hydraulic system for controlling the flow rate of lubricating oil in a three-clutch transmission, comprising an oil tank, an oil pump, a main oil circuit, a first oil outlet, a second oil outlet, and a third oil outlet, wherein the upstream end oil circuit of the oil pump is connected to the oil tank, the downstream end oil circuit of the oil pump is connected to the main oil circuit, a pressure relief bypass is provided between the downstream end oil circuit and the upstream end oil circuit of the oil pump, and a pressure relief valve is provided on the pressure relief bypass for unloading the main oil circuit;

[0005] The oil inlet of the pressure relief valve is connected to the main oil circuit through the pressure relief valve oil inlet passage, the oil return port of the pressure relief valve is connected to the upstream oil circuit of the oil pump through the pressure relief valve oil return passage, the first control end of the pressure relief valve is connected to the first oil outlet passage through the first feedback oil passage, and the second control end of the pressure relief valve is connected to the second oil outlet passage through the second feedback oil passage;

[0006] The main oil circuit is connected to the first oil outlet passage through a clutch permanent oil supply passage, and is used to supply oil to a clutch or motor that requires long-term lubrication; a first throttle valve is provided on the clutch permanent oil supply passage, and a flow control bypass is provided between the upstream end and the downstream end of the first throttle valve, and a first flow control valve is provided on the flow control bypass, and is used to control the oil flow rate of the first oil outlet passage;

[0007] A second flow control valve is provided between the second oil outlet passage and the main oil circuit, the oil inlet end of the second flow control valve is connected to the main oil circuit through the second flow control oil inlet passage, and the oil outlet end of the second flow control valve is connected to the second oil outlet passage through an oil pipe;

[0008] The third oil outlet passage is connected to the main oil circuit through an oil pipe and is used for lubricating and supplying oil to the shaft gears.

[0009] Preferably, the oil inlet end of the first flow control valve is connected to the main oil circuit through a first flow control oil inlet passage, and the oil outlet end of the first flow control valve is connected to the first oil outlet passage through an oil pipe.

[0010] Preferably, a second throttle valve is provided on the third oil outlet passage for controlling the flow rate of the oil supply for lubricating the shaft gears.

[0011] Preferably, the second flow control valve is a normally open solenoid valve, which is used for controlling the constant oil supply or large flow oil supply of the clutch.

[0012] Preferably, the pressure relief valve is a mechanical pressure relief valve.

[0013] Preferably, the first flow control valve is a normally closed solenoid valve.

[0014] With the above solution, the upstream oil circuit of the oil pump is connected to the oil tank, the downstream oil circuit of the oil pump is connected to the main oil circuit, a pressure relief bypass is provided between the downstream oil circuit and the upstream oil circuit of the oil pump, and a pressure relief valve is provided on the pressure relief bypass for unloading the main oil circuit;

[0015] The oil inlet of the pressure relief valve is connected to the main oil circuit through the pressure relief valve oil inlet passage, the oil return port of the pressure relief valve is connected to the upstream oil circuit of the oil pump through the pressure relief valve oil return passage, the first control end of the pressure relief valve is connected to the first oil outlet passage through the first feedback oil passage, and the second control end of the pressure relief valve is connected to the second oil outlet passage through the second feedback oil passage;

[0016] When the hydraulic pressure of the main oil circuit is too high, the pressure relief valve can control the opening of the pressure relief valve through the size relationship between the first feedback oil channel, the second feedback oil channel and the spring force of the pressure relief valve, thereby releasing the excessive pressure in the main oil circuit, keeping the pressure of the main oil circuit within a reasonable range, and avoiding oil pump overload.

[0017] The main oil circuit is connected to the first oil outlet passage through a clutch permanent oil supply passage, and is used to supply oil to a clutch or motor that requires long-term lubrication; a first throttle valve is provided on the clutch permanent oil supply passage, and a flow control bypass is provided between the upstream end and the downstream end of the first throttle valve, and a first flow control valve is provided on the flow control bypass, and is used to control the oil flow rate of the first oil outlet passage;

[0018] By adjusting the opening of the throttle valve, the flow rate of the first oil outlet passage is controlled together with the first flow control valve.

[0019] A second flow control valve is provided between the second oil outlet passage and the main oil circuit, the oil inlet end of the second flow control valve is connected to the main oil circuit through the second flow control oil inlet passage, and the oil outlet end of the second flow control valve is connected to the second oil outlet passage through an oil pipe;

[0020] The third oil outlet passage is connected to the main oil circuit through an oil pipe and is used for lubricating and supplying oil to the shaft gears.

[0021] The third oil outlet passage is provided with a second throttle valve for controlling the flow rate of the oil supply for lubricating the shaft gear.

[0022] The second flow control valve is a normally open solenoid valve, which is used for controlling the constant oil supply or large flow oil supply of the clutch.

[0023] Preferably, the pressure relief valve is a mechanical pressure relief valve to reduce costs.

[0024] Preferably, the first flow control valve is a normally closed solenoid valve, which is opened only when the clutch corresponding to the first oil outlet requires a large lubrication flow to replenish lubricating oil, thereby avoiding clutch erosion.

[0025] The advantages of the present invention are that the first flow control valve and the second flow control valve are arranged at the rear end of the main oil circuit, and can cooperate with the throttle valve to accurately control the lubricating oil flow required by the three oil outlets, that is, the lubricating oil flow required by the three clutches. The pressure relief valve is arranged at the front end of the main oil circuit to ensure that when the hydraulic pressure of the main oil circuit is too high, it can be unloaded in time, so that the pressure of the main oil circuit is kept in a reasonable range to avoid overloading of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, a hydraulic system for controlling the flow rate of lubricating oil in a three-clutch transmission includes an oil tank 1, an oil pump 3, a main oil circuit 4, a first oil outlet 12, a second oil outlet 20, and a third oil outlet 21. The upstream oil circuit 2 of the oil pump 3 is connected to the oil tank 1, and the downstream oil circuit of the oil pump 3 is connected to the main oil circuit 4. A pressure relief bypass is provided between the downstream oil circuit of the oil pump 3 and the upstream oil circuit 2. A pressure relief valve 6 is provided on the pressure relief bypass for unloading the main oil circuit 4. In this embodiment, the pressure relief valve 6 is a mechanical pressure relief valve, which is normally closed. The oil pump 3 is an engine oil pump.

[0028] The oil inlet of the pressure relief valve 6 is connected to the main oil circuit 4 through the pressure relief valve oil inlet passage 8, the oil return port of the pressure relief valve 6 is connected to the upstream end oil circuit 2 of the oil pump 3 through the pressure relief valve oil return passage 5, the first control end of the pressure relief valve 6 is connected to the first oil outlet passage 12 through the first feedback oil passage 7, and the second control end of the pressure relief valve 6 is connected to the second oil outlet passage 20 through the second feedback oil passage 11;

[0029] The opening of the pressure relief valve 6 is controlled by the oil pressure difference between the sum of the hydraulic pressure of the second feedback oil passage 11 and the spring force of the pressure relief valve 6 and the hydraulic pressure of the first feedback oil passage 7:

[0030] ① When the sum of the hydraulic pressure of the second feedback oil channel 11 and the spring force of the pressure relief valve 6 is ≥ the hydraulic pressure of the first feedback oil channel 7, the main oil circuit 4 does not need to be unloaded, and the pressure relief valve 6 is normally closed. At this time, the second flow control valve 19 is in the open state, and the load of the oil pump 3 is within the rated operating range. When the clutch corresponding to the first oil outlet channel 12 requires large flow lubrication, the first flow control valve 13 can be quickly switched and controlled after the oil pump is started, effectively avoiding the "jamming" fault caused by excessive load at the start of the oil pump 3;

[0031] ② When the sum of the hydraulic pressure of the second feedback oil channel 11 and the spring force of the pressure relief valve 6 is less than the hydraulic pressure of the first feedback oil channel 7, the main oil channel 4 needs to be unloaded, and a pressure difference is formed between the spring force of the pressure relief valve 6 and the oil pressure of the second feedback oil channel 11 and the oil pressure of the first feedback oil channel 7. The opening of the mechanical pressure relief valve is adjusted to make the pressure relief valve 6 normally open. The oil in the main oil channel 4 returns to the oil tank 1 from the upstream end oil channel 2 of the oil pump 3 through the pressure relief valve 6, thereby releasing the excessive pressure of the main oil channel 4, keeping the pressure of the main oil channel 4 in a reasonable range, avoiding overloading of the oil pump 3, and ensuring that the oil output of the first oil outlet channel 12, the second oil outlet channel 20, and the third oil outlet channel 21 is stable and controllable.

[0032] The main oil circuit 4 is connected to the first oil outlet channel 12 through a clutch permanent oil supply channel 10, and is used to supply oil to a clutch or motor that requires long-term lubrication; a first throttle valve 9 is provided on the clutch permanent oil supply channel 10, and a flow control bypass is provided between the upstream end and the downstream end of the first throttle valve 9, and a first flow control valve 13 is provided on the flow control bypass, which is used to control the oil flow rate of the first oil outlet channel 12;

[0033] In this embodiment, the oil inlet end of the first flow control valve 13 is connected to the main oil circuit 4 through the first flow control oil inlet passage 14, and the oil outlet end of the first flow control valve 13 is connected to the first oil outlet passage 12 through an oil pipe. By adjusting the opening size of the first throttle valve 9, the flow size of the first oil outlet passage 12 is controlled together with the first flow control valve 13. In this embodiment, the first flow control valve 13 is a normally closed solenoid valve. Only when the clutch corresponding to the first oil outlet passage requires a large lubrication flow, the first flow control valve is opened to replenish the lubricating oil, thereby avoiding clutch ablation.

[0034] A second flow control valve 19 is provided between the second oil outlet passage 20 and the main oil circuit 4. The oil inlet end of the second flow control valve 19 is connected to the main oil circuit 4 through the second flow control oil inlet passage 18, and the oil outlet end of the second flow control valve 19 is connected to the second oil outlet passage 20 through an oil pipe. In this embodiment, the second flow control valve 19 is a normally open solenoid valve, which is used to control the second oil outlet passage 20 to supply oil to the clutch at all times or at a high flow rate. The third oil outlet passage 21 is connected to the main oil circuit 4 through an oil pipe, and is used for lubricating the gears.

[0035] In this embodiment, a second throttle valve 22 is provided on the third oil outlet passage 21 for controlling the flow rate of the oil supply for lubricating the shaft gear.

[0036] In this embodiment, the first flow control valve 13 and the second flow control valve 19 are both two-position two-way proportional solenoid valves.

[0037] The first throttle valve 9 and the second throttle valve 22 can be replaced by throttle orifice plates, which can not only meet the demand for constant oil supply, but also avoid the layout difficulties caused by multiple valves without increasing the cost separately.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A hydraulic system for controlling the flow rate of lubricating oil in a three-clutch transmission, comprising an oil tank (1), an oil pump (3), a main oil circuit (4), a first oil outlet passage (12), a second oil outlet passage (20), and a third oil outlet passage (21), wherein the upstream oil circuit (2) of the oil pump (3) is connected to the oil tank (1), and the downstream oil circuit of the oil pump (3) is connected to the main oil circuit (4), and is characterized in that: A pressure relief bypass is provided between the downstream oil circuit of the oil pump (3) and the upstream oil circuit (2), and a pressure relief valve (6) is provided on the pressure relief bypass for unloading the main oil circuit (4); The oil inlet of the pressure relief valve (6) is connected to the main oil circuit (4) via the pressure relief valve oil inlet passage (8), the oil return port of the pressure relief valve (6) is connected to the upstream oil circuit (2) of the oil pump (3) via the pressure relief valve oil return passage (5), the first control end of the pressure relief valve (6) is connected to the first oil outlet passage (12) via the first feedback oil passage (7), and the second control end of the pressure relief valve (6) is connected to the second oil outlet passage (20) via the second feedback oil passage (11); The main oil circuit (4) is connected to the first oil outlet channel (12) through a clutch permanent oil supply channel (10) for supplying oil to a clutch or motor that requires long-term lubrication; a first throttle valve (9) is provided on the clutch permanent oil supply channel (10); a flow control bypass is provided between the upstream end and the downstream end of the first throttle valve (9); a first flow control valve (13) is provided on the flow control bypass; an oil inlet end of the first flow control valve (13) is connected to the main oil circuit (4) through a first flow control oil inlet channel (14); an oil outlet end of the first flow control valve (13) is connected to the first oil outlet channel (12) through an oil pipe for controlling the oil outlet flow of the first oil outlet channel (12); the first flow control valve (13) is a two-position, two-way normally closed solenoid valve; A second flow control valve (19) is provided between the second oil outlet passage (20) and the main oil circuit (4); an oil inlet end of the second flow control valve (19) is connected to the main oil circuit (4) via a second flow control oil inlet passage (18); an oil outlet end of the second flow control valve (19) is connected to the second oil outlet passage (20) via an oil pipe; the second flow control valve (19) is a two-position, two-position normally open solenoid valve, and is used for controlling the constant oil supply or high-flow oil supply of the clutch; The third oil outlet passage (21) is connected to the main oil circuit (4) through an oil pipe and is used for lubricating the shaft gears. When the sum of the hydraulic pressure of the second feedback oil passage and the spring force of the pressure relief valve is greater than or equal to the hydraulic pressure of the first feedback oil passage, the main oil circuit does not need to be unloaded and the pressure relief valve is normally closed. When the sum of the hydraulic pressure of the second feedback oil passage and the spring force of the pressure relief valve is less than the hydraulic pressure of the first feedback oil passage, the main oil circuit needs to be unloaded, and the spring force of the pressure relief valve and the oil pressure of the second feedback oil passage and the oil pressure of the first feedback oil passage form a pressure difference, which adjusts the opening of the mechanical pressure relief valve so that the pressure relief valve is in a normally open state, and the oil in the main oil circuit returns to the oil tank from the upstream oil circuit of the oil pump through the pressure relief valve.

2. The hydraulic system for controlling the lubricating oil flow rate of a three-clutch transmission according to claim 1, characterized in that: The third oil outlet passage (21) is provided with a second throttle valve (22) for controlling the flow rate of the oil supply for lubricating the shaft gear.

3. The hydraulic system for controlling the lubricating oil flow rate of a three-clutch transmission according to claim 1, characterized in that: The pressure relief valve (6) is a mechanical pressure relief valve.

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