Valve, and the use thereof for a clutch

Patent metadata

Field	Value
Publication number	US-2016169402-A1
Application number	US-201414906294-A
Country	US
Kind code	A1
Filing date	Jul 24, 2014
Priority date	Aug 31, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A valve, in particular proportional pressure regulating valve, having a valve piston ( 12 ) which is guided in longitudinally movable fashion in a valve housing ( 10 ) and which can be actuated by means of an operation device ( 14 ), wherein the valve housing ( 10 ) has multiple fluid ports (P, A, T) and wherein, in one movement position of the valve piston ( 12 ), a fluid-conducting connection is produced between a pressure supply port (P) and a working port (A), and in another movement position, a further fluid-conducting connection is produced between the working port (A) and a tank port (T), is distinguished by the fact that the respective pressure difference that arises between the working port (A) and the tank port (T) as flow passes through the further fluid-conducting connection acts, by way of an actuation device ( 30 ), on the valve piston ( 12 ) such that the latter passes from a stop position ( 32 ), proceeding from which the further fluid-conducting connection is substantially shut off, into a fully open opening position, in which, in relation to the stop position ( 32 ), an enlarged opening cross section from working port (A) to tank port (T) is realized.

First claim

1 . A valve, in particular a proportional pressure regulating valve, having a valve piston ( 12 ) longitudinally displaceably guided in a valve housing ( 10 ) and controllable by means of an actuator device ( 14 ), said valve housing ( 10 ) having a plurality of fluid ports (P, A, T) and wherein, in a movement position of the valve piston ( 12 ), a fluid-carrying connection between a pressure supply port (P) and a utility port (A) is established and, in another movement position, another fluid-carrying connection between the utility port (A) and a tank port (T) is established, characterized in that the respective differential pressure, created when flowing through the further fluid-carrying connection between the utility port (A) and the tank port (T), acts on the valve piston ( 12 ) by means of a control device ( 30 ) in such a way, that the valve piston ( 12 ) acts against a stop position ( 32 ), from which the further fluid-carrying connection is noticeably inhibited, to arrive at a fully open port position in which, compared to the stop position ( 32 ), an enlarged opening cross-section from utility port (A) to tank port (T) is achieved.

2 . The valve according to claim 1 , characterized in that the control device ( 30 ) carries the respective differential pressure, by means of a control duct ( 34 ) preferably arranged in the valve housing ( 10 ), to a piston ring surface ( 36 ) of the otherwise pressure-equalized valve piston ( 12 ), which, starting from the stop position ( 32 ), reaches the fully open port position ( FIG. 3 ) under the influence of this differential pressure.

3 . The valve according to claim 1 , characterized in that the stop position ( 32 ) is formed by a stop element ( 46 ) pressurized by means of an energy accumulator, preferably by a compression spring ( 44 ), wherein the stop element ( 46 ) is supported on fixed parts of the valve housing ( 10 ) or actuator device ( 14 ).

4 . The valve according to claim 1 , characterized in that the stop element is formed of a disc ( 46 ) with a central recess, that the disc ( 46 ) in the stop position ( 32 ) on its front end is supported on the pole core ( 24 ) of the actuating magnet ( 14 ) and that the compression spring ( 44 ), with its one free end, is supported on the disc ( 46 ) and, with its other free end, is supported on a termination disc ( 60 ) affixed between the valve housing ( 10 ) and the pole core ( 24 ).

5 . The valve according to claim 1 , characterized in that the valve piston ( 12 ) with its one free end ( 52 ) penetrates the stop element ( 46 ) and in the region of this free end ( 52 ) has a catch ( 54 ), which, upon actuating the actuator device ( 14 ), moves the stop element ( 46 ) against the action of the energy accumulator ( 44 ) from the stop position ( 32 ) to a maximum possible effective position, in which the fluid-carrying connection between the supply port (P) and the utility port (A) is established and the connection from utility port (A) to tank port (T) is blocked.

6 . The valve according to claim 1 , characterized in that the actuator device ( 14 ) is formed of a push-action actuating magnet and that both the valve piston ( 12 ) and the rod-shaped actuating element ( 22 ) of the actuating magnet ( 14 ) have a continuous pressure-equalizing duct ( 56 ), which opens on one side thereof into the tank port (T), regardless of the movement position of the valve piston ( 12 ).

7 . The valve according to claim 1 , characterized in that the control duct ( 34 ) opens into a diametrically expanded fluid chamber ( 38 ) of the valve housing ( 10 ), in which, in every movement position of the valve piston ( 12 ), its one piston ring surface ( 36 ) is guided, which results from a stepped transition of different piston diameters (d 1 /d 2 ) of the valve piston ( 12 ), which tapers in this way in the direction of the tank port (T).

8 . The valve according to claim 1 , characterized in that the control duct ( 34 ), at its one end-side outlet from the valve housing ( 10 ), is closed by a closure plug ( 40 ) in this region, which keeps the inlet of the control duct ( 34 ) into the fluid chamber ( 38 ) free, and that the other end of the control duct opens into a connection point (A′), which picks up the differential pressure between the utility port (A) and the tank port (T).

9 . The valve according to claim 1 , characterized in that when assuming the stop position ( 32 ), the valve piston ( 12 ) has a further reduction in diameter ( 62 ) with an axial length such that the supply port (P) is opened and the utility port (A) is blocked by the valve piston ( 12 ), wherein, when moving the valve piston ( 12 ) under the influence of the actuator device ( 14 ) in the direction of the tank port (T), the fluid-carrying connection between the supply port (P) and utility port (A) is increasingly established.

10 . An application of a valve according to an embodiment according to claim 1 in a clutch, comprising at least two clutch discs which, in the coupled state, establish a frictional connection with each other against the action of a clutch energy accumulator under the actuating pressure at the utility port (A) of the actuated valve and, in the uncoupled state, under the influence of the clutch energy accumulator, pushes operating fluid from the utility port (A) to the tank port (T) with the valve not being actuated, having a first opening cross-section until reaching the stop position ( 32 ) and having a comparatively larger opening cross-section with further movement of the valve piston ( 12 ) away from the stop position ( 32 ) in the direction of the armature ( 16 ) of the actuator device ( 14 ).

11 . The application according to claim 10 , characterized in that, after complete decoupling, the valve piston ( 12 ) is in an indifferent state so that, when actuating the clutch by switching on the actuator device ( 14 ) again, a minimum magnetic force is sufficient to move the valve piston ( 12 ) into its stop position to make contact with the stop element ( 14 , 40 ).

Assignees

• Hydac Fluidtechnik Gmbh

Inventors

• Hilzendegen Philipp
• Bruck Peter

Classifications

• Y10T137/0396

  Involving pressure control · CPC title

• F16K39/04

  for sliding valves · CPC title

• F16K11/0716

  with fluid passages through the valve member (F16K11/0704, F16K11/0708, F16K11/0712 take precedence) · CPC title

• F16K11/0708

  comprising means to avoid jamming of the slide or means to modify the flow · CPC title

• F16D2048/0221

  Valves for clutch control systems; Details thereof · CPC title