JPS6483965A - Hydraulic control device for automatic transmission - Google Patents
Hydraulic control device for automatic transmissionInfo
- Publication number
- JPS6483965A JPS6483965A JP23819887A JP23819887A JPS6483965A JP S6483965 A JPS6483965 A JP S6483965A JP 23819887 A JP23819887 A JP 23819887A JP 23819887 A JP23819887 A JP 23819887A JP S6483965 A JPS6483965 A JP S6483965A
- Authority
- JP
- Japan
- Prior art keywords
- clutch
- pressure
- speed
- oil pressure
- directional control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To simplify the structure by providing a directional control valve adapted to communicate a supply oil path with a pressure discharge path when the supply oil pressure is less than a designated value in an oil path between a pressure regulating valve for controlling oil pressure supplied to a friction element and the friction element. CONSTITUTION:3-4 PCV 50 is constructed so that when output oil pressure is controlled by pilot pressure controlled by the second duty solenoid 46 to shift 3-4 clutch 27 from the second speed to the third speed in the open state, oil pressure is gradually increased and passed through a directional control valve 220 to be sent to the 3-4 clutch 27, whereby the clutch is connected without a speed change shock. On the other band, at the time of shifting from the third speed to the second speed, though output oil pressure of the 3-4 PCV 50 is decreased, it can be kept from being zero by a fail-safe spring 205 or the like, and when it becomes less than a designated value, the directional control valve 220 is switched by a spring 228 to open a drain port and let clutch pressure escape, whereby the clutch 27 is opened. By this arrangement, it is not necessary to provide a shift valve controlled according to operating condition by control means, so that the structure be simplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23819887A JPS6483965A (en) | 1987-09-22 | 1987-09-22 | Hydraulic control device for automatic transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23819887A JPS6483965A (en) | 1987-09-22 | 1987-09-22 | Hydraulic control device for automatic transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6483965A true JPS6483965A (en) | 1989-03-29 |
Family
ID=17026614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23819887A Pending JPS6483965A (en) | 1987-09-22 | 1987-09-22 | Hydraulic control device for automatic transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6483965A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696508A (en) * | 2015-01-12 | 2015-06-10 | 四川大学 | Hydraulic gear shifting system controlled by pressure relay, provided with double oil ways and capable of realizing quick oil filling |
-
1987
- 1987-09-22 JP JP23819887A patent/JPS6483965A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696508A (en) * | 2015-01-12 | 2015-06-10 | 四川大学 | Hydraulic gear shifting system controlled by pressure relay, provided with double oil ways and capable of realizing quick oil filling |
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