Hydraulic drive system
US-2017166253-A1 · Jun 15, 2017 · US
Hydraulical shifting device for an automatic transmission
US8944232B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8944232-B2 |
| Application number | US-201313734049-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 4, 2013 |
| Priority date | Jan 9, 2012 |
| Publication date | Feb 3, 2015 |
| Grant date | Feb 3, 2015 |
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- Title
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Abstract
Official abstract text for this publication.
A hydraulic shifting device for an automatic transmission for engaging and disengaging a parking lock. The shifting device comprises a parking lock cylinder ( 203 ) for actuating the parking lock, and a parking lock valve ( 201 ) which, for hydraulic control of the parking lock cylinder ( 203 ), can be switched to at least first and second shift positions. In this case the hydraulic shifting device comprises a further parking lock valve ( 202 ), and the two parking lock valves ( 201, 202 ) and the parking lock cylinder ( 203 ) are designed and connected with one another in such manner that the parking lock can only be disengaged by pressurizing the parking lock cylinder ( 203 ) if the two parking lock valves ( 201, 202 ) are each switched to a particular shift position.
First claim
Opening claim text (preview).
The invention claimed is: 1. A hydraulic shifting device, for an automatic transmission, for engaging and disengaging a parking lock, the hydraulic shifting device comprising: a parking lock cylinder ( 203 ) for actuating the parking lock, and a first parking lock valve ( 201 ) which, for hydraulic control of the parking lock cylinder ( 203 ), is movable into at least first and second shift positions, the hydraulic shifting device comprising a second parking lock valve ( 202 )…
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Classifications
- F15B20/008Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
- F15B15/26Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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Frequently asked questions
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- What does patent US8944232B2 cover?
- A hydraulic shifting device for an automatic transmission for engaging and disengaging a parking lock. The shifting device comprises a parking lock cylinder ( 203 ) for actuating the parking lock, and a parking lock valve ( 201 ) which, for hydraulic control of the parking lock cylinder ( 203 ), can be switched to at least first and second shift positions. In this case the hydraulic shifting de…
- Who is the assignee on this patent?
- Zahnradfabrik Friedrichshafen
- What technology area does this patent fall under?
- Primary CPC classification F15B20/008. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Feb 03 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).