Hydraulic control system for automatic transmissions
阅读：774发布：2022-08-08
专利汇可以提供Hydraulic control system for automatic transmissions专利检索，专利查询，专利分析的服务。并且A hydraulic control system for automatic transmissions includes a torque converter, a gear train consisting of planetary gears and a hydraulic servo system for engaging the gear train at a certain drive gear ratio. The hydraulic servo system comprises a shift valve group, a throttle valve, a governor valve, a manual selector valve, a pressure regulator valve, an auxiliary regulator valve and a throttle relay valve arranged in an interconnected network. When the manual selector valve is placed in the ''''D'''' range, the governor pressure and the throttle pressure act on the auxiliary regulator valve to change the supply of pressurized hydraulic fluid to the pressure regulator valve. The hydraulic control pressure is decreased as the governor pressure increases, and at the same time, the control pressure is increased with the increase in the throttle pressure. When the throttle pressure drops below a certain value in the application of the engine brake and when shifting the manual selector valve from the ''''D'''' range to the ''''2'''' or ''''L'''' range, the throttle relay valve is actuated by the throttle pressure and actuation of the auxiliary regulator valve is blocked. Consequently, the supply of hydraulic control fluid to the pressure regulator valve is interrupted so that the hydraulic control fluid is maintained at a constant high value in relationship to the governor pressure.，下面是Hydraulic control system for automatic transmissions专利的具体信息内容。
1. A hydraulic control system, for automatic transmissions in automotive vehicles, comprising, in combination, means, including a pump, constituting a source of pressurized fluid; a multichambered manual selector valve, operable to select the operating speed range of an automatic transmission, connected to said source to receive pressurized fluid therefrom; a multi-chambered throttle valve connected to said source to receive pressurized fluid therefrom and operable to develop a hydraulic pressure corresponding to a throttle opening; a multi-chambered governor valve connected in a pressurized fluid communication with said manual selector valve and operable to develop a hydraulic pressure corresponding to vehicle speed; a multi-chambered pressure regulator valve connected to said source to receive pressurized fluid therefrom and to return pressurized fluid thereto to maintain the hydraulic pressure from said source at a selected value; a multi-chambered throttle relay valve having one chamber in pressurized fluid communication with said manual selector valve and another chamber in pressurized fluid communication with said throttle valve; a multi-chambered auxiliary regulator valve having one chamber in pressurized fluid communication, through one chamber of said throttle relay valve, with said throttle valve, another chamber in pressurized fluid communication, through another chamber of said throttle relay valve, with said manual selector valve, and a further chamber in pressurized fluid communication with said governor valve; said auxiliary regulator valve being in pressurized fluid communication with said source and with a chamber of said pressure regulator valve to control communication between said last-named chamber and said source; said auxiliary regulator valve being subjected to the pressure controlled by said throttle valve and to the pressure controlled by said governor valve, acting in opposition to each other; said throttle relay valve being subjected to the pressure controlled by said throttle valve; and spring means acting on said throttle relay valve in opposition to the pressure controlled by said throttle valve; said auxiliary regulator valve, through its connection to said source and to said last-named chamber of said pressure regulator valve, controlling said pressure regulator valve to change the selected value of the pressure of the pressurized fluid in accordance with the pressures controlled by said throttle valve and by said governor valve; said throttle relay valve increasing the selected value of the pressurized fluid from said source when the pressure controlled by said throttle valve decreases below a certain value.
2. A hydraulic control system, as set forth in claim 1, wherein said throttle relay valve has a displaceable valve member subjected to pressurized fluid from said throttle valve, said auxiliary regulator valve comprises a first valve member and a second valve member coaxial with said first valve member, a spring disposed between said first and second valve members for biasing said valve members apart, said first valve member being subjected, on spaced surfaces, to the throttle pressure and to the governor pressure for displacement within said auxiliary regulator valve for alternately admitting and blocking flow of the pressurized fluid flowing from said source through said auxiliary regulator valve into said pressure regulator valve, said second valve member being subjected to pressurized fluid in communication therewith through said throttle relay valve from said throttle valve and through said throttle relay valve from said manual selector valve and, when the throttle pressure acting on said second valve member through said throttle relay valve falls below a selected value, said second valve member being displaced towards said first valve member and, through said spring, displacing said first valve member for discontinuing the flow of the pressurized fluid from said auxiliary regulator valve to said pressure regulator valve.
3. A hydraulic control system, as set forth in claim 1, wherein said auxiliary regulator valve comprises a spring biased displaceable valve member subjected on spaced surfaces, to pressurized fluid at thE throttle pressure and at the governor pressure for alternately admitting and blocking flow of the pressurized fluid therefrom to said pressure regulator valve, said throttle relay valve comprising a spring biased first valve member and a second valve member in axial alignment therewith, said first valve member being subjected to pressurized fluid at the throttle pressure so that said first valve member cuts off flow of pressurized fluid from said source to said auxiliary regulator valve when the throttle pressure drops below a selected value, said second valve member having one surface thereof subjected to the pressurized fluid from said manual selector valve for displacing said second valve member into contact with said first valve member for displacing said first valve member for effecting a flow of pressurized fluid from said source into said auxiliary regulator valve, and said second valve member having another surface thereof subjected to the pressurized fluid at the throttle pressure from said throttle valve so that, when flow of the pressurized fluid from said manual selector valve is discontinued, said second valve member is displaced away from said first valve member and said first valve member, in dependence on the throttle pressure acting thereon, can be displaced for cutting off flow to said auxiliary regulator valve.
4. A hydraulic control system, as set forth in claim 1, wherein the hydraulic control system is in pressurized fluid communication with a front clutch, a rear clutch, a front brake, and a rear brake, the hydraulic control system including a multi-chambered first shift valve, a multi-chambered second shift valve, and a multi-chambered orifice control valve, one chamber in each of said first valve, second shift valve, and orifice control valve being in pressurized fluid communication with said governor valve, said first shift valve having separate chambers in communication with said manual selector valve and a further chamber in communication with said throttle valve, and one of said chambers in said first shift valve in pressurized fluid communication with said manual selector valve being in pressurized fluid communication with said rear clutch and said front brake, said second shift valve having two separate chambers therein in pressurized fluid communication with said manual selector valve, another chamber in said second shift valve being in pressurized fluid communication with said throttle valve and still another chamber in said second shift valve in pressurized fluid communication with said governor valve and with said front clutch, one of the chambers in said second shift valve in communication with said manual selector valve being arranged to supply pressurized fluid to said rear brake and yet another chamber arranged to supply pressurized fluid to said front brake, said orifice control valve having a chamber therein arranged to receive pressurized fluid passing from the chamber in said second shift valve to said front brake, and orifice means disposed in the path of flow of the pressurized fluid from the chamber in said shift valve to said front brake and to the chamber in said orifice control valve.
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