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System pressure valves for hydraulic systems of motor vehicle transmissions

A system pressure and hydraulic system technology, applied in the field of system pressure valve for hydraulic system of motor vehicle transmission, can solve the problems of limited structural freedom, limited structure and high cost

Active Publication Date: 2022-03-11
ZF FIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since two valves direct the remainder to the pump suction side, the hydraulic switching device ("spool housing") of the hydraulic system generally also has to be constructed so that the two valves are in the immediate vicinity of the pump suction area, which limits the structural degrees of freedom
Furthermore, the relief valve for the high-pressure circuit must also be embodied relatively long in order to be able to function, which can lead to higher costs and further restrict the construction

Method used

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  • System pressure valves for hydraulic systems of motor vehicle transmissions
  • System pressure valves for hydraulic systems of motor vehicle transmissions
  • System pressure valves for hydraulic systems of motor vehicle transmissions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] figure 1 A motor vehicle 1 is shown, in the example shown a passenger motor vehicle (Pkw). The motor vehicle 1 comprises a combustion-powered engine 2 which drives the motor vehicle 1 by means of an automatic transmission 3 having a hydraulic system 4 .

[0040] figure 2 shows the basis figure 1 Part of the circuit diagram of the hydraulic system 4. The hydraulic system 4 comprises a pump system 5, in the illustrated embodiment a double pump system. The pump system 5 comprises a primary pump 6 and a secondary pump 7 which can be powered, for example, by the combustion-powered engine 2 ( figure 1 )drive.

[0041] The main pump 6 and the secondary pump 7 may be two separate pumps from each other. The pump system 5 can however also combine the main pump 6 and the secondary pump 7 to form a single pump, for example a double-stroke vane unit pump. Dual stroke vane unit pumps can include primary and secondary displacements. The rotor of the double stroke vane unit pu...

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PUM

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Abstract

The invention relates to a system pressure valve for a hydraulic system (4) of a motor vehicle transmission. According to the invention it is proposed to fill the secondary system pressure circuit (18) of the hydraulic system (4) of the motor vehicle transmission earlier in such a way that the surplus from the main system pressure circuit (16) of the hydraulic system (4) is not transferred is directed to the suction boost (40), instead it is directed into the secondary system pressure circuit (18). This can be achieved by means of a system pressure valve according to the invention for the main system pressure circuit ( 16 ) configured for this function. The invention also relates to a hydraulic system (4) for a motor vehicle transmission, a motor vehicle transmission with the hydraulic system and a motor vehicle with the motor vehicle transmission.

Description

technical field [0001] The invention relates to a system pressure valve for a hydraulic system of a motor vehicle transmission, a hydraulic system with the system pressure valve, a motor vehicle transmission with the hydraulic system and a motor vehicle with the motor vehicle transmission . Background technique [0002] Hydraulic systems are known, in particular for automatic transmissions of motor vehicles, which have a high-pressure circuit (primary system pressure circuit) and a low-pressure circuit (secondary system pressure circuit). Such hydraulic systems typically comprise two pumps, which can be designed as double-stroke vane unit pumps with a fixed (speed-dependent) delivery volume. Here, each pump is accordingly assigned to one of the two system pressure circuits (high or low pressure). The functional principle is based on the fact that in the event of an oil shortage, the pump (secondary pump) assigned to the low pressure circuit is switched to high pressure and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F16H61/00
CPCF16H2061/0279F16H61/0276F16H61/0267F16H61/0031F16K11/07F15B13/022F15B2211/20576F15B2211/4053F15B2211/61F15B2211/7142F15B2211/428
Inventor A·哈伯斯托克M·赫尔曼
Owner ZF FIEDRICHSHAFEN AG