Hydraulic control device for an automatic transmission

Patent metadata

Field	Value
Publication number	US-10161509-B2
Application number	US-201415029796-A
Country	US
Kind code	B2
Filing date	Sep 17, 2014
Priority date	Oct 17, 2013
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A hydraulic control device for controlling multiple torque-transferring shift elements of an automatic transmission, where each of the shift elements features at least one hydraulic actuator, which includes one actuating pressure chamber, at least one stop valve and at least one hydraulic shift device with multiple pressure adjusting devices connected to the different shift elements. Thereby, the stop valve is configured and arranged in such a manner that the actuators of at least two shift elements are hydraulically connectable to the pressure adjusting devices through a common stop valve. In a first shifting position, all actuating pressure chambers of the at least two shift elements are tightly sealed by the stop valve. In a second shifting position, all actuating pressure chambers of the at least two shift elements are connected through the stop valve to the pressure adjusting device allocated to the respective shift element.

First claim

The invention claimed is:

1. A hydraulic control device for controlling a plurality of multiple shift elements in an automatic transmission, each shift element of the plurality of shift elements comprising at least one hydraulic actuator having an actuating pressure chamber, the hydraulic control device comprising
a shiftable stop valve; and
a hydraulic shift device connected to a pressure source with a plurality of pressure adjusting devices, each pressure adjusting device of the plurality of pressure adjusting devices fluidly coupled to a respective shift element of the plurality of shift elements,
wherein the shiftable stop valve is formed and arranged such that the hydraulic actuators of at least two shift elements of the plurality of shift elements are hydraulically connectable to the respective pressure adjusting devices of the plurality of pressure adjusting devices through the shiftable stop valve,
wherein, in a first shifting position of the shiftable stop valve, all actuating pressure chambers of the at least two shift elements are sealed by the shiftable stop valve, and, in a second shifting position of the shiftable stop valve, all actuating pressure chambers of the at least two shift elements are connected through the shiftable stop valve to the respective pressure adjusting devices of the plurality of pressure adjusting devices.

2. The hydraulic control device of claim 1 , wherein the shiftable stop valve comprises a closing body and a housing body, the closing body disposed within the housing body, the housing body defining at least one port to each hydraulic actuator of the at least two shift elements and at least one port to the respective pressure adjusting devices of the plurality of pressure adjusting devices, the closing body movable into a first and a second position relative to the housing body, each of the hydraulic actuators connected to the shiftable stop valve being closed in the first position, the hydraulic actuators of the at least two shift elements connected to the respective pressure adjusting devices of the plurality of pressure adjusting devices through the closing body in the second position.

3. The hydraulic control device of claim 2 , wherein the housing body defines a control pressure port, the closing body movable into one of the first and second positions with hydraulic control pressure acting on the closing body, the hydraulic control pressure adjustable by the hydraulic shift device, the closing body movable into the other of the first and second positions by a spring that is coupled to the closing body.

4. The hydraulic control device of claim 3 , wherein the closing body is movable into the second position with the hydraulic control pressure, the closing body movable into the first position with the spring and a corresponding reduced hydraulic control pressure.

5. The hydraulic control device of claim 2 , wherein the closing body is a cylindrical piston valve, the cylindrical piston valve disposed within the housing body.

6. The hydraulic control device of claim 5 , wherein the shiftable stop valve is a shiftable seat valve.

7. The hydraulic control device of claim 5 , wherein the piston valve is formed as a stepped piston, the stepped piston comprising a plurality of piston sections, each piston section of the plurality of piston sections having a respective outer diameter, the outer diameters of the piston sections varying and increasing from one end of the piston valve to the other end of the piston valve, the piston valve having at least as many piston sections as hydraulic actuators of the at least two shift elements, the piston valve received within a stepped bore formed in the housing body, the stepped bore having a mating contour with a plurality of bore sections, each bore section of the plurality of bore sections having a respective internal diameter, the piston valve displaceable within the stepped bore such that outlets between two piston sections abut one another at corresponding outlets of the bore sections and form a sealing seat at the first position of the piston valve.

8. The hydraulic control device of claim 7 , wherein the closing body comprises a plurality of cylindrical valve sections, each cylindrical valve section of the plurality of cylindrical valve sections having a respective diameter, the cylindrical valve sections of the plurality of cylindrical valve sections disposed concentrically within one another around a central axis of the shaft, the cylindrical valve sections of the plurality of cylindrical valve sections axially displaceable relative to each other and between which elastic compression springs are disposed, each cylindrical valve section of the plurality of cylindrical valve sections pressed through the elastic compression springs at the respective sealing seat in the first position of the closing body.

9. The hydraulic control device of claim 7 , wherein at least one elastic seal is disposed proximate the sealing seats on the closing body or the housing body.

10. The hydraulic control device of claim 5 , wherein the housing body is a shaft of the automatic transmission, the piston valve axially displaceable within the shaft.

11. The hydraulic control device of claim 2 , wherein the closing body is a hollow cylindrical sleeve valve, the housing body comprising a shaft of the automatic transmission and a transmission housing part concentrically surrounding the shaft, the hollow cylindrical sleeve valve being concentric with the shaft, the hollow cylindrical sleeve valve being axially displaceable between the shaft and the transmission housing part.

12. The hydraulic control device of claim 11 , wherein an inner contour of the hollow cylindrical sleeve valve is a stepped bore having a plurality of sleeve sections, each sleeve section of the plurality of sleeve sections having a respective inner diameter, the hollow cylindrical sleeve valve received on an outer contour of the shaft, the shaft having a plurality of shaft sections, each shaft section of the plurality of shaft sections having a respective diameter, the hollow cylindrical sleeve valve having at least as many sleeve sections as hydraulic actuators of the at least two shift elements, the hollow cylindrical sleeve valve displaceable on the shaft such that outlets between the sleeve sections of the plurality of sleeve sections abut one another at corresponding outlets of the shaft sections of the plurality of shaft section and a sealing seat at the first position.

13. The hydraulic control device of claim 2 , wherein the closing body comprises a plurality of tappets connected to a control piston, the plurality of tappets axially displaceable manner within the housing body, a number of tappets of the plurality of tappets corresponding to at least a number of the hydraulic actuators of at least two shift elements of the plurality of shift elements.

14. The hydraulic control device of claim 13 , wherein the housing body is a shaft of the automatic transmission, ports of the actuators in the shaft axially spaced from each other, each tappets of the plurality of tappets having a respective axial length from the piston valve.

15. An automatic transmission comprising:
a plurality of multiple shift elements, each shift element of the plurality of shift elements comprising at least one hydraulic actuator having an actuating pressure chamber;
a shiftable stop valve; and
a hydraulic shift device connected to a pressure source with a plurality of pressure adjusting devices, each pressure adjusting device of the plurality of pressure adjusting devices fluidly coupled to a respective shift element of the plur

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Beck Stefan
• Sibla Christian
• Margraf Christoph
• Ziemer Peter

Classifications

• F16H61/0267 Primary

  Layout of hydraulic control circuits, e.g. arrangement of valves · CPC title

• F16H61/0276

  Elements specially adapted for hydraulic control units, e.g. valves · CPC title

• F16H61/0021

  Generation or control of line pressure · CPC title

• B60K20/00

  Arrangement or mounting of change-speed gearing control devices in vehicles · CPC title

• F16H2061/0279

  Details of hydraulic valves, e.g. lands, ports, spools or springs · CPC title