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 vehicle

Info

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
Application number
JP4145780A
Other languages
Japanese (ja)
Other versions
JPH0114054B2 (en
Inventor
Shuzo Moroto
Yoichi Hayakawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin AW Co Ltd
Original Assignee
Aisin AW Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aisin AW Co Ltd filed Critical Aisin AW Co Ltd
Priority to JP4145780A priority Critical patent/JPS56138020A/en
Publication of JPS56138020A publication Critical patent/JPS56138020A/en
Publication of JPH0114054B2 publication Critical patent/JPH0114054B2/ja
Granted legal-status Critical Current

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
JP4145780A 1980-03-31 1980-03-31 Automatic two-wheel/four-wheel drive change-over mechanism for four-wheel drive vehicle Granted JPS56138020A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5513103B2 (en) * 1974-10-14 1980-04-07

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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