Stepless automatic transmission for motor vehicles
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60K-041/12
F16H-011/06
출원번호
US-0555596
(1983-11-28)
우선권정보
JP-0210809 (1982-11-30); JP-0210813 (1982-11-30)
발명자
/ 주소
Sakakibara, Shiro
출원인 / 주소
Aisin-Warner, Ltd.
대리인 / 주소
Pahl, Lorusso & Loud
인용정보
피인용 횟수 :
8인용 특허 :
5
초록▼
A stepless automatic transmission for a motor vehicle includes a V-belt type stepless transmission mechanism having input and output pulleys mounted respectively on input and output shafts, each pulley being provided with a hydraulic servo for varying the effective diameter thereof, and a V-belt lin
A stepless automatic transmission for a motor vehicle includes a V-belt type stepless transmission mechanism having input and output pulleys mounted respectively on input and output shafts, each pulley being provided with a hydraulic servo for varying the effective diameter thereof, and a V-belt linking the input and output pulleys to transmit power therebetween, in combination with a forward/reverse change-over mechanism and a coupler such as a fluid coupling, centrifugal clutch or friction clutch, and a hydraulic control system. The hydraulic control system includes a primary regulator valve for generating a primary line pressure by regulating pressurized oil from a pressure source responsive to one or more operating conditions of a vehicle such as vehicle speed and/or throttle opening and a secondary regulator valve for generating a secondary line pressure at a lower level than said primary line pressure by regulating pressurized oil from a pressure source responsive to one or more operating conditions of the vehicle. The V-belt type stepless transmission is characterized by input and output pulley hydraulic servos with substantially equal effective pressure receiving areas. The hydraulic control system is arranged to control the hydraulic servo of the input pulley by either supplying primary line pressure or by bleeding pressure therefrom and includes a shift sequence mechanism adapted to supply the secondary line pressure to the hydraulic servo of the output pulley when the hydraulic servo of the input pulley is supplied with fluid pressure higher than a preset value in normal and upshift operations of the vehicle, and to supply the primary line pressure to the hydraulic servo of the output pulley when the hydraulic servo of the input pulley is supplied with oil pressure lower than a preset value in downshifting the vehicle.
대표청구항▼
1. A stepless automatic transmission for a vehicle comprising: (a) a V-belt stepless transmission mechanism comprising: (i) an input pulley having a first axially stationary flange and first axially movable flange: (ii) input pulley hydraulic servo means for receiving a first fluid pressure an
1. A stepless automatic transmission for a vehicle comprising: (a) a V-belt stepless transmission mechanism comprising: (i) an input pulley having a first axially stationary flange and first axially movable flange: (ii) input pulley hydraulic servo means for receiving a first fluid pressure and for moving said first axially movable flange relative to said first axially stationary flange to vary the effective diameter of said input pulley responsive to changes in said first fluid pressure; (iii) an output pulley having a second axially stationary flange and a second axially movable flange; (iv) output pulley hydraulic servo means for receiving a second fluid pressure and for moving said second movable flange relative to said second stationary flange to vary the effective diameter of said output pulley responsive to changes in said second fluid pressure; and (v) a V-belt passing around said input and output pulleys for transmitting torque from said input pulley to said output pulley; and (b) a hydraulic control system comprising: (i) reduction ratio control means for selectively supplying primary line pressure to said input pulley hydraulic servo or bleeding pressure therefrom, thereby varying the reduction ratio of said V-belt transmission mechanism; (ii) a primary regulator valve for converting line pressure from a pressure source into said primary line pressure and for regulating said primary line pressure responsive to change in one or more operating conditions of the vehicle; (iii) a secondary regulator valve for converting line pressure from a pressure source into secondary line pressure, lower than said primary line pressure, responsive to change in one or more operating conditions of the vehicle; (iv) shift sequence means for supplying (1) secondary line pressure to said output pulley hydraulic servo when said input pulley hydraulic servo is supplied with fluid pressure higher than a predetermined value during normal and upshift operation of the vehicle and (2) primary line pressure to said output pulley hydraulic servo when said input pulley hydraulic servo is supplied with fluid pressure lower than the predetermined value during downshifting of the vehicle. 2. The stepless automatic transmission of claim 1, wherein the effective fluid pressure receiving area of said output pulley hydraulic servo is substantially equal to that of said input pulley hydraulic servo. 3. The stepless automatic transmission of claim 1, wherein said primary line pressure is regulated responsive to changes in vehicle speed. 4. The stepless automatic transmission of claim 1, wherein said primary line pressure is regulated responsive to changes in the throttle opening of the vehicle. 5. The stepless automatic transmission of claim 1, wherein said shift sequence means comprises a shift sequence valve having a spool shiftable, in response to an input fluid pressure corresponding to fluid pressure received by said input pulley hydraulic servo, between a first position allowing communication between a primary line pressure supply conduit and an operating fluid supply conduit for supplying fluid to said output pulley hydraulic servo, when said input fluid pressure is lower than a predetermined value, and a second position allowing communication between a secondary line pressure supply conduit and an operating fluid supply conduit for supplying fluid to said output pulley hydraulic servo, when said input oil pressure in higher than the predetermined value, while blocking said communication between said primary line pressure supply conduit and said output pulley hydraulic servo. 6. The stepless automatic transmission of claim 5, further comprising a first check valve inserted between said secondary line pressure supply conduit and said operating fluid supply conduit supplying said output pulley hydraulic servo. 7. The stepless automatic transmission of claim 6 further comprising: a supply conduit for supplying the output pressure of said shift sequence valve to said reduction control means; and a second check valve inserted between said conduit for the output of said shift sequence valve and said secondary line pressure conduit. 8. The stepless automatic transmission of claim 1, further comprising an oil pump driven by the engine of the vehicle which serves as said pressure source for said primary regulator valve and wherein said pressure source for said secondary regulator valve is excess fluid resulting from said regulation of said primary line pressure. 9. The stepless automatic transmission of claim 1, further comprising a forward/reverse change-over mechanism for selectively shifting said V-belt stepless transmission between forward and reverse modes of operation. 10. A hydraulic control system for controlling a vehicular stepless automatic transmission responsive to changes in one or more operating conditions of a vehicle, the stepless automatic transmission employing a V-belt type stepless transmission mechanism including an input pulley and an output pulley mounted on an input shaft and an output shaft, respectively, each of the pulleys being provided with a hydraulic servo for varying the effective diameter thereof, and a V-belt linking the input and output pulleys to transmit power therebetween, said control system comprising: a primary regulator valve for converting line pressure from a pressure source into a primary line pressure and for regulating said primary line pressure responsive to change in one or more operating conditions of the vehicle; a secondary regulator valve for converting line pressure from a pressure source into secondary line pressure, lower than said primary line pressure, responsive to change in one or more operating conditions of the vehicle; shift sequence means for supplying (1) secondary line pressure to said output pulley hydraulic servo when said input pulley hydraulic servo is supplied with fluid pressure higher than a predetermined value during normal and upshift operation of the vehicle and (2) primary line pressure to said output pulley hydraulic servo when said input pulley hydraulic servo is supplied with fluid pressure lower than a second predetermined value during downshifting of the vehicle; reduction ratio control means for controlling supply of primary line pressure to the hydraulic servo of said input pulley and drainage of oil pressure therefrom, thereby varying the reduction ratio of said V-belt type transmission mechanism; whereby said reduction ratio control means generates a shift pressure signal to said primary regulator valve at the time of shifting, and said primary regulator valve raising the primary line pressure to a higher level during shifting in response to the shift pressure signal. 11. The hydraulic control system of claim 10, wherein said primary line pressure is regulated responsive to changes in vehicle speed. 12. The hydraulic control system of claim 10, wherein said primary line pressure is regulated responsive to changes in the throttle opening of the vehicle. 13. The hydraulic control system of claim 10, wherein said shift sequence means comprises a shift sequence valve having a spool shiftable, in response to an input fluid pressure corresponding to fluid pressure received by said input pulley hydraulic servo, between a first position allowing communication between a primary line pressure supply conduit and an operating fluid supply conduit for supplying fluid to said output pulley hydraulic servo, when said input fluid pressure is lower than a predetermined value, and a second position allowing communication between a secondary line pressure supply conduit and an operating fluid supply conduit for supplying fluid to said output pulley hydraulic servo, when said input oil pressure is higher than the predetermined value, while blocking said communication between said primary line pressure supply conduit and said output pulley hydraulic servo. 14. The hydraulic control system of claim 13, further comprising a check valve inserted between said secondary line pressure supply conduit and said operating fluid supply conduit supplying said output pulley hydraulic servo. 15. The hydraulic control system of claim 10, further comprising an oil pump driven by the engine of the vehicle which serves as said pressure source for said primary regulator valve, and wherein said pressure source for said secondary regulator valve is excess fluid resulting from said regulation of said primary line pressure.
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이 특허에 인용된 특허 (5)
Underwood Herbert N. (Chicago IL), Continuously variable transmission down shift control.
Smit Geoffrey N. (Rancho Palos Verdes CA) Anderson Scott R. (Evergreen Park IL) Tsai Shan-Chin (Arlington Heights IL), Control arrangement for a variable pulley transmission.
Baltusis Paul A. (Northville MI) Wolodkiewicz Stephen R. (Plymouth MI), Hydraulic control valve system for an automatic multiple-speed transmission with a lockup torque converter and electroni.
Okada Mitsuhiko (Toyota JPX) Ito Hiroshi (Toyota JPX), Hydraulic fluid pressure control device for a continuously variable automobile transmission providing a quick speed chan.
Crandall Scott R. (Wixom MI) Droste Timothy A. (Howell MI) Rosen Stanley D. (Southfield MI), Torque converter lockup clutch control for an automatic transmission.
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