JPS56138020A - Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicle - Google Patents
Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicleInfo
- Publication number
- JPS56138020A JPS56138020A JP4145780A JP4145780A JPS56138020A JP S56138020 A JPS56138020 A JP S56138020A JP 4145780 A JP4145780 A JP 4145780A JP 4145780 A JP4145780 A JP 4145780A JP S56138020 A JPS56138020 A JP S56138020A
- Authority
- JP
- Japan
- Prior art keywords
- wheel drive
- wheel
- drive
- oil pressure
- over
- 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.)
- Granted
Links
Abstract
PURPOSE: To prevent the twist of a drive train at low speed curvilinear drive by a mechanism wherein, when the difference of number of revolution between the front and rear wheels exceeds the set value, the oil in an oil pressure servo is exhausted in the captioned mechanism of the vehicle with speed changer which performs automatic change-over from two-wheel drive to four-wheel drive and vice versa due to the vehicle speed.
CONSTITUTION: While in two-wheel curvilinear drive at the vehicle speed below the set value and, the difference of number of revolution between the front and rear wheels detected by detectors 260 and 270 exceeds the set value, a solenoid valve 250 is operated to produce the oil pressure within an oil passage 257. This oil pressure is led to the change-over valve 230 through a check valve 290 and an oil passage 291 to move a spool 231 upwards. Consequently, an oil passage 236 is connected to an exhaust passage 235 to exhaust the oil pressure within the oil pressure servo 80 to to release a friction clutch 8 for four-wheel drive, resulting in two-wheel drive. Consequently, even under the low speed condition to be changed-over to four-wheel drive normally, the vehicle is changed-over to two-wheel drive and the twist of the drive train is prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4145780A JPS56138020A (en) | 1980-03-31 | 1980-03-31 | Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4145780A JPS56138020A (en) | 1980-03-31 | 1980-03-31 | Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56138020A true JPS56138020A (en) | 1981-10-28 |
JPH0114054B2 JPH0114054B2 (en) | 1989-03-09 |
Family
ID=12608896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4145780A Granted JPS56138020A (en) | 1980-03-31 | 1980-03-31 | Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56138020A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4609064A (en) * | 1983-05-24 | 1986-09-02 | Nissan Motor Co., Ltd. | Part-time four-wheel drive system with steering angle responsive control |
JPS62289435A (en) * | 1986-06-10 | 1987-12-16 | Toyota Motor Corp | Driving control method for automobile with four-wheel drive device |
US4766973A (en) * | 1986-05-01 | 1988-08-30 | Toyota Jidosha Kabushiki Kaisha | 4WD vehicle torque distribution device incorporating friction engaging device providing multi mode operation, and method for operation thereof |
US4779492A (en) * | 1985-12-04 | 1988-10-25 | Toyota Jidosha Kabushiki Kaisha | Twin type hydraulic pressure control device with individual line pressure regulation valves for two stage automatic transmission |
US4840247A (en) * | 1986-05-06 | 1989-06-20 | Toyota Jidosha Kabushiki Kaisha | Device for controlling 4wd vehicle central differential restriction device according to front and rear wheels rotational speed difference, and method of operation thereof |
JPH01197124A (en) * | 1988-01-31 | 1989-08-08 | Mazda Motor Corp | Control device for four-wheel drive vehicle |
US5947224A (en) * | 1995-10-19 | 1999-09-07 | Nissan Motor Co., Ltd. | Four-wheel drive control system for vehicle |
JP2007137124A (en) * | 2005-11-15 | 2007-06-07 | Toyota Motor Corp | Vehicle control device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5250416A (en) * | 1975-10-20 | 1977-04-22 | Komatsu Zenoa Kk | Two-cycle engine |
JPS5513103U (en) * | 1978-07-12 | 1980-01-28 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5513103B2 (en) * | 1974-10-14 | 1980-04-07 |
-
1980
- 1980-03-31 JP JP4145780A patent/JPS56138020A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5250416A (en) * | 1975-10-20 | 1977-04-22 | Komatsu Zenoa Kk | Two-cycle engine |
JPS5513103U (en) * | 1978-07-12 | 1980-01-28 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4609064A (en) * | 1983-05-24 | 1986-09-02 | Nissan Motor Co., Ltd. | Part-time four-wheel drive system with steering angle responsive control |
US4779492A (en) * | 1985-12-04 | 1988-10-25 | Toyota Jidosha Kabushiki Kaisha | Twin type hydraulic pressure control device with individual line pressure regulation valves for two stage automatic transmission |
US4766973A (en) * | 1986-05-01 | 1988-08-30 | Toyota Jidosha Kabushiki Kaisha | 4WD vehicle torque distribution device incorporating friction engaging device providing multi mode operation, and method for operation thereof |
US4840247A (en) * | 1986-05-06 | 1989-06-20 | Toyota Jidosha Kabushiki Kaisha | Device for controlling 4wd vehicle central differential restriction device according to front and rear wheels rotational speed difference, and method of operation thereof |
JPS62289435A (en) * | 1986-06-10 | 1987-12-16 | Toyota Motor Corp | Driving control method for automobile with four-wheel drive device |
US4866624A (en) * | 1986-06-10 | 1989-09-12 | Toyota Jidosha Kabushiki Kaisha | Device for controlling vehicle four wheel drive front/rear coupling device according to rotational speeds of front and rear vehicle wheels and method of operation thereof |
JPH01197124A (en) * | 1988-01-31 | 1989-08-08 | Mazda Motor Corp | Control device for four-wheel drive vehicle |
US5947224A (en) * | 1995-10-19 | 1999-09-07 | Nissan Motor Co., Ltd. | Four-wheel drive control system for vehicle |
JP2007137124A (en) * | 2005-11-15 | 2007-06-07 | Toyota Motor Corp | Vehicle control device |
Also Published As
Publication number | Publication date |
---|---|
JPH0114054B2 (en) | 1989-03-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS56138019A (en) | Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicle | |
DE3434394C2 (en) | ||
JPS56138020A (en) | Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicle | |
JPS5780926A (en) | Transfer directing device of four-wheel driving car | |
JPS5747240A (en) | Two system hydraulic pressure control valve | |
JPS55156750A (en) | Antiskid controller | |
JPS56164267A (en) | Transmission for vehicle | |
JPS5643031A (en) | Four wheel drive with automatic transmission | |
JPS56149223A (en) | Automatic intermittent action device for clutch of vehicle and the like | |
JPS5711143A (en) | Antiskid controller | |
JPS5730653A (en) | Air service brake system for car | |
JPS5337279A (en) | Safety device of vehicular | |
EP0384300A3 (en) | Engine torque control system for vehicle with automatic transmission | |
JPS5718545A (en) | Antiskid control device for railway car | |
JPS577746A (en) | Antiskid controller | |
JPS5757945A (en) | Hydraulic pressure control unit to automatic transmission | |
JPS5683651A (en) | Preventing device for creep of vehicle equipped with automatic speed change gear | |
JPS54153433A (en) | Running drive device for working cars | |
JPS5335866A (en) | Automobile automatic speed change gear control system | |
JPS5769149A (en) | Hydraulic controller for automatic speed change gear | |
JPS5726035A (en) | Brake system in automobile | |
JPS5779351A (en) | Erroneous function preventive device for hydraulic speed change gear for vehicle | |
JPS55103141A (en) | Electronic control type automatic speed change gear | |
JPS56124757A (en) | High gear clutch controller for automatic speed change gear | |
JPS56124563A (en) | Parking brake of self-propelling agricultural machine |