US3670599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic transmission controls
Assignee: Mazda Motor Corp
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Filing: 1969-10-08
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Granted: 1972-06-20
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Expires: 1989-10-08
Abstract
Abstract Automatic transmission controls for use in an automotive vehicle which improves smoothness and reduces pumping losses in automatic shifting by modifying the hydraulic pressure to be applied to friction engaging device in accordance with the torque output of the vehicle engine during normal driving of the vehicle and in accordance with the torque transmitted from the vehicle at the time of engine braking. The controls include a regulator valve operable to extend the operating range to high engine speed and to increase the varying rate at low speed, a timing valve effective to control the engaging time of a servo-motor operated at the low speed, a shift valve being capable to impart hysteresis thereto, and an inhibitor valve being adapted to prevent transmission into the low speed driving condition only if the vehicle driving speed exceeds over a predetermined speed.
Inventors
- 👤 Hiroaki Nagamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:03
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08; Y; Y10; Y10S; Y10S74/00; Y10S74/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
579 words
An automatic transmission control for use in an automotive vehicle comprising a drive shaft, a driven shaft, a hydraulic source for producing hydraulic pressure, primary means including friction engaging means for establishing a low speed power transmitting connectiOn between said two shafts, secondary means including friction engaging means for establishing a high speed power transmitting connection between said two shafts, shift valve means hydraulically connected to said hydraulic source to control the hydraulic pressure from said hydraulic source for controlling the engaging of said primary means and releasing said secondary means when said shift valve means is in a first position and for releasing said primary means and engaging said secondary means when said shift valve means is in a second position, means establishing a first connection for applying the hydraulic pressure from said shift valve means to said secondary means when said shift valve means is in said second position and for exhausting the hydraulic pressure in said secondary means through said shift valve means when said shift valve means is in said first position, means establishing a second connection for applying the hydraulic pressure from said shift valve means to said primary means through a check valve when said shift valve means is in said second position, means establishing a third connection for exhausting the hydraulic pressure in said primary means through said shift valve means when said shift valve means is in said first position, timing valve means in said third connection for controlling the exhaust of the hydraulic pressure from said primary means through said third connection, said timing valve means including a piston having two pressure receiving surfaces thereon and being slidably disposed within said timing valve means, spring means urging said piston so as to permit the exhaust from said primary means to pass through the timing valve means, governor valve means hydraulically connected to said hydraulic source and operatively connected to one of said two shafts for producing governor pressure in proportion to the vehicle driving speed, means establishing a fourth connection for connecting said governor valve means with said timing valve means through said shift valve means, a restriction in said fourth connection between said shift valve means and said timing valve means, one of said two pressure receiving surfaces of the timing valve piston being adapted to receive the governor pressure through said fourth connection to urge said piston in the same direction as the force of said spring means when said shift valve means is in said first position, the other of said two pressure receiving surfaces of the timing valve piston being adapted to always receive the governor pressure to urge said piston in the opposite direction to the force of said spring means, whereby when said shift valve means is in said second position the piston of said timing valve means is adjustably positioned to block the exhaust of the hydraulic pressure from said primary means in accordance with the vehicle driving speed as controlled by the resultant force of said spring means and the governor pressure applied to said other of the two pressure receiving surfaces, and when said shift valve means is shifted from said second position to said first position said piston is moved to enable the exhaust of the hydraulic pressure after a lapse of time in accordance with the position of said piston and the gradually increasing governor pressure applied to said one of the two pressure receiving surfaces through said restriction.
Claim 2
Dependent Claim
579 words
An automatic transmission control for use in an automotive vehicle comprising a drive shaft, a driven shaft, a hydraulic source for producing hydraulic pressure, primary means including friction engaging means for establishing a low speed power transmitting connectiOn between said two shafts, secondary means including friction engaging means for establishing a high speed power transmitting connection between said two shafts, shift valve means hydraulically connected to said hydraulic source to control the hydraulic pressure from said hydraulic source for controlling the engaging of said primary means and releasing said secondary means when said shift valve means is in a first position and for releasing said primary means and engaging said secondary means when said shift valve means is in a second position, means establishing a first connection for applying the hydraulic pressure from said shift valve means to said secondary means when said shift valve means is in said second position and for exhausting the hydraulic pressure in said secondary means through said shift valve means when said shift valve means is in said first position, means establishing a second connection for applying the hydraulic pressure from said shift valve means to said primary means through a check valve when said shift valve means is in said second position, means establishing a third connection for exhausting the hydraulic pressure in said primary means through said shift valve means when said shift valve means is in said first position, timing valve means in said third connection for controlling the exhaust of the hydraulic pressure from said primary means through said third connection, said timing valve means including a piston having two pressure receiving surfaces thereon and being slidably disposed within said timing valve means, spring means urging said piston so as to permit the exhaust from said primary means to pass through the timing valve means, governor valve means hydraulically connected to said hydraulic source and operatively connected to one of said two shafts for producing governor pressure in proportion to the vehicle driving speed, means establishing a fourth connection for connecting said governor valve means with said timing valve means through said shift valve means, a restriction in said fourth connection between said shift valve means and said timing valve means, one of said two pressure receiving surfaces of the timing valve piston being adapted to receive the governor pressure through said fourth connection to urge said piston in the same direction as the force of said spring means when said shift valve means is in said first position, the other of said two pressure receiving surfaces of the timing valve piston being adapted to always receive the governor pressure to urge said piston in the opposite direction to the force of said spring means, whereby when said shift valve means is in said second position the piston of said timing valve means is adjustably positioned to block the exhaust of the hydraulic pressure from said primary means in accordance with the vehicle driving speed as controlled by the resultant force of said spring means and the governor pressure applied to said other of the two pressure receiving surfaces, and when said shift valve means is shifted from said second position to said first position said piston is moved to enable the exhaust of the hydraulic pressure after a lapse of time in accordance with the position of said piston and the gradually increasing governor pressure applied to said one of the two pressure receiving surfaces through said restriction.
Claim 3
Dependent Claim
505 words
An automatic transmission control for use in an automotive vehicle comprising a drive shaft, a driven shaft, first hydraulically actuable means including friction engaging means for establishing a low speed power transmitting connection between said shafts, second hydraulically actuable means including friction engaging means for establishing a high speed power transmitting connection between said shafts, a hydraulic source for supplying fluid under pressure to said first and second means, a first shifting valve for directing the flow of fluid under pressure from said source to said first means to actuate the low speed power transmitting connection, a second shiFting valve for directing the flow of fluid under pressure from said source to said second means to actuate the high speed power transmitting connection, means establishing a first connection for conducting fluid from said first shifting valve to actuate said first means, means establishing a second connection for exhausting fluids from said first means to enable the actuation of said first means, means establishing a third connection for conducting fluid from said second shifting valve to actuate said second means, a governor valve operatively connected to said driven shaft for supplying fluid under pressure in proportion to the vehicle driving speed, a timing valve including a piston positioned to selectively block the second connection, said piston being movable in a first direction to enable the exhaust of fluids and being movable in a second opposite direction to preclude the exhaust of fluids, means establishing a fourth connection for supplying fluid under pressure from said governor valve directly to a first surface of said piston for forcing the piston in the second direction, a spring disposed within said timing valve to force said piston in the first direction by bearing on a second surface thereof, means establishing a fifth connection for supplying fluid under pressure from said governor valve to the second surface of said piston for forcing the piston in the first direction, said fifth connection extending through said second shifting valve and including a restricted orifice disposed between said second shifting valve and said timing valve, said second shifting valve being movably disposed to effectively open said fifth connection when in a first position corresponding to the low speed power transmitting connection and to effectively close said fifth connection when in a second position corresponding to the high speed power transmitting connection so that the governor pressure fluid commences flowing through said fifth connection after said second shifting valve is changed from the second high speed condition to the first low speed condition, whereby said timing valve piston is moved in the first direction only after a certain time has elapsed to permit the fluid in the fifth connection to bypass said restriction and with the aid of the spring force overcome the fluid pressure forces on the first surface of the piston, whereby the actuation of the first low speed power transmitting connection is delayed for a time proportional to the velocity of said vehicle at the time of initiation of the downshifting sequence.
Claim 4
Dependent Claim
505 words
An automatic transmission control for use in an automotive vehicle comprising a drive shaft, a driven shaft, first hydraulically actuable means including friction engaging means for establishing a low speed power transmitting connection between said shafts, second hydraulically actuable means including friction engaging means for establishing a high speed power transmitting connection between said shafts, a hydraulic source for supplying fluid under pressure to said first and second means, a first shifting valve for directing the flow of fluid under pressure from said source to said first means to actuate the low speed power transmitting connection, a second shiFting valve for directing the flow of fluid under pressure from said source to said second means to actuate the high speed power transmitting connection, means establishing a first connection for conducting fluid from said first shifting valve to actuate said first means, means establishing a second connection for exhausting fluids from said first means to enable the actuation of said first means, means establishing a third connection for conducting fluid from said second shifting valve to actuate said second means, a governor valve operatively connected to said driven shaft for supplying fluid under pressure in proportion to the vehicle driving speed, a timing valve including a piston positioned to selectively block the second connection, said piston being movable in a first direction to enable the exhaust of fluids and being movable in a second opposite direction to preclude the exhaust of fluids, means establishing a fourth connection for supplying fluid under pressure from said governor valve directly to a first surface of said piston for forcing the piston in the second direction, a spring disposed within said timing valve to force said piston in the first direction by bearing on a second surface thereof, means establishing a fifth connection for supplying fluid under pressure from said governor valve to the second surface of said piston for forcing the piston in the first direction, said fifth connection extending through said second shifting valve and including a restricted orifice disposed between said second shifting valve and said timing valve, said second shifting valve being movably disposed to effectively open said fifth connection when in a first position corresponding to the low speed power transmitting connection and to effectively close said fifth connection when in a second position corresponding to the high speed power transmitting connection so that the governor pressure fluid commences flowing through said fifth connection after said second shifting valve is changed from the second high speed condition to the first low speed condition, whereby said timing valve piston is moved in the first direction only after a certain time has elapsed to permit the fluid in the fifth connection to bypass said restriction and with the aid of the spring force overcome the fluid pressure forces on the first surface of the piston, whereby the actuation of the first low speed power transmitting connection is delayed for a time proportional to the velocity of said vehicle at the time of initiation of the downshifting sequence.
Claim 5
Dependent Claim
236 words
An automatic transmission control for use in an automotive vehicle comprising a drive shaft, a driven shaft, a selectively engageable low speed power transmitting means including friction engaging means for establishing a first connection between said shafts, a selectively engageable high speed power transmitting means including friction engaging means for establishing a second connection between said shafts, automatic shifting means including fluid controlled valve means for selectively engaging said first and second connections, the operative connection between the driven shaft and the automatic shifting means including governor valve means having an output fluid pressure proportional to the rotational velocity of the driven shaft, and time delay means for prolonging the time span between the initiation and the completion of an automatic shifting from said second high speed connection to said first low speed connection, said delay means being operatively connected to the driven shaft for continuously varying the duration of the time delay as a function of the rotational velocity of the driven shaft at the time of the initiation of the downshifting sequence, characterized in that the time delay means comprises a movable piston operatively connected at both ends thereof with the output fluid from the governor valve means, a restricted orifice disposed adjacent one of the piston ends in the path of said output fluid and said piston being positioned to seLectively block a fluid exhaust passage leading from one of said transmitting connections.
Claim 6
Dependent Claim
236 words
An automatic transmission control for use in an automotive vehicle comprising a drive shaft, a driven shaft, a selectively engageable low speed power transmitting means including friction engaging means for establishing a first connection between said shafts, a selectively engageable high speed power transmitting means including friction engaging means for establishing a second connection between said shafts, automatic shifting means including fluid controlled valve means for selectively engaging said first and second connections, the operative connection between the driven shaft and the automatic shifting means including governor valve means having an output fluid pressure proportional to the rotational velocity of the driven shaft, and time delay means for prolonging the time span between the initiation and the completion of an automatic shifting from said second high speed connection to said first low speed connection, said delay means being operatively connected to the driven shaft for continuously varying the duration of the time delay as a function of the rotational velocity of the driven shaft at the time of the initiation of the downshifting sequence, characterized in that the time delay means comprises a movable piston operatively connected at both ends thereof with the output fluid from the governor valve means, a restricted orifice disposed adjacent one of the piston ends in the path of said output fluid and said piston being positioned to seLectively block a fluid exhaust passage leading from one of said transmitting connections.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |