Slide valve having a valve slide able to be impinged upon by an actuator

Patent metadata

Field	Value
Publication number	US-9500207-B2
Application number	US-201214237680-A
Country	US
Kind code	B2
Filing date	Aug 3, 2012
Priority date	Aug 9, 2011
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A slide valve is described, having a valve slide, which is able to be impinged upon by an actuator in a first direction and by an impinging device in a second direction, opposite to the first direction, and which, using control sections is able to connect hydraulically a first working connection to an inlet connection or an outlet connection, and a second working connection to an or the inlet connection or an or the outlet connection, a first control section assigned to the first working connection including at least a first and a second subcontrol section and a recess that is situated axially between them and is preferably radially encircling, which is able to connect hydraulically the working connection to an or the outlet connection as a function of an axial position of the valve slide.

First claim

What is claimed is:

1. A slide valve, comprising:
a valve slide, which is able to be impinged upon by an actuator in a first direction and by an impinging device in a second direction opposite to the first direction, and which, using control sections is able to connect hydraulically a first working connection to one of an inlet connection and an outlet connection, and a second working connection to one of the inlet connection and the outlet connection, wherein:
a first control section assigned to the first working connection includes at least a first subcontrol section and a second subcontrol section, and a recess that is situated axially between the first subcontrol section and the second subcontrol section, the recess being radially encircling and able to connect hydraulically the first working connection to the outlet connection as a function of an axial position of the valve slide;
a second control section is assigned to the inlet connection, such that the second control section, as a function of the axial position of the valve slide, is able to connect the inlet connection hydraulically alternatively to one of the first working connection and the second working connection; and
at least one of an axial position and an axial measure of the first control section and the first and second subcontrol sections and at least one of an axial position and an axial measure of the second control section and of a third control section with respect to the valve slide are dimensioned in such a way that, if the actuator does not act upon the valve slide, the first working connection is hydraulically connected to the outlet connection.

2. The slide valve as recited in claim 1 , wherein starting from an end section of the valve slide, which is impinged upon by the impinging device, a first outlet connection, the first working connection, the inlet connection, the second working connection, and a second outlet connection are situated in an axial sequence.

3. The slide valve as recited in claim 1 , wherein starting from an end section of the valve slide, which is impinged upon by the impinging device, a second outlet connection, the second working connection, the inlet connection, the first working connection, and a first outlet connection are situated in an axial sequence.

4. The slide valve as recited in claim 1 , wherein a ratio of an axial length of the first control section to an extension of the first working connection parallel to a longitudinal axis of the valve slide has a value of approximately 0.9 to 1.1, corresponding to a formula

h_piston
h_channel

=

0.9
⁢

⁢
to
⁢

⁢

1.1
.

5. The slide valve as recited in claim 1 , wherein a ratio of a sum of an axial length of the first and the second subcontrol sections and an axial length of a control area assigned to the first control section on a longitudinal bore of the slide valve radially guiding the valve slide to an axial length of the first control section has a value of approximately less than, or equal to 0.7, corresponding to a formula

a
+
b
+
c

h_piston

≤
0

,
7.

6. The slide valve as recited in claim 1 , wherein:
if the actuator acts upon the valve slide with a first force, the first working connection is hydraulically connected to the inlet connection and the second working connection is hydraulically connected to the outlet connection,
if the actuator is acting upon the valve slide with a second force, the first working connection is hydraulically connected to the outlet connection and the second working connection is hydraulically connected to the outlet connection, and
if the actuator acts upon the valve slide with a third force, the first working connection is hydraulically connected to the outlet connection and the second working connection is hydraulically connected to the inlet connection.

7. An automatic transmission for a motor vehicle, which is able to be operated by at least one double-acting hydraulic cylinder, comprising:
a slide valve that includes:
a valve slide, which is able to be impinged upon by an actuator in a first direction and by an impinging device in a second direction opposite to the first direction, and which, using control sections is able to connect hydraulically a first working connection to one of an inlet connection and an outlet connection, and a second working connection to one of the inlet connection and the outlet connection, wherein:
a first control section assigned to the first working connection includes at least a first subcontrol section and a second subcontrol section, and a recess that is situated axially between the first subcontrol section and the second subcontrol section, the recess being radially encircling and able to connect hydraulically the first working connection to the outlet connection as a function of an axial position of the valve slide;
a second control section is assigned to the inlet connection, such that the second control section, as a function of the axial position of the valve slide, is able to connect the inlet connection hydraulically alternatively to one of the first working connection and the second working connection; and
at least one of an axial position and an axial measure of the first control section and the first and second subcontrol sections and at least one of an axial position and an axial measure of the second control section and of a third control section with respect to the valve slide are dimensioned in such a way that, if the actuator does not act upon the valve slide, the first working connection is hydraulically connected to the outlet connection.

Assignees

• Fleischer Walter
• Bosch Gmbh Robert

Inventors

• Fleischer Walter

Classifications

• F16H2061/301

  for power assistance, i.e. servos with follow up action · CPC title

• F16K11/07

  with cylindrical slides · CPC title

• Y10T137/8671

  With annular passage [e.g., spool] · CPC title

• F15B13/0402 Primary

  for linearly sliding valves, e.g. spool valves · CPC title

• F16H61/0276

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