US3874255A — Hydraulic speed change control device

Claim 1

Independent Claim 254 words

A fluid pressure control device of a transmission for use in a vehicle having selector valve means, a fluid torque convertor having first and second frictional engaging means for controlling hydraulically plural hydraulically operated frictional engaging means to produce plural speed change ratios, and a planetary gear mechanism, comprising a pressure control valve provided between a source of pressurized fluid and speed selector valve said control valve having a solenoid value controlled by an electronic control circuit connected to said source and having a pressure regulator valve provided within a cylindrical valve, a timing pressure valve provided for controlling said cylindrical valve and having first and second orifices provided therein and connected to constant pressure wherein said first orifice controls said cylindrical valve and a third movable orifice engaged with the outlet of said second orifice wherein the electric signal of the solenoid valve for moving the orifice is connected to the electric signal of a solenoid for operating said speed selector valve by the operation of said electronic control circuit which includes an OR-circuit, differential circuit and monostable multivibrator so that when a speed transfer signal is produced, said movable orifice is always opened, and the control back pressure of said cylindrical valve is quickly drained by utilizing the pressure difference between the second orifice of said timing pressure valve whereby the pressurized fluid to the clutch is lowered to initial regulator pressure, and thereafter said cylindrical valve is moved by the control current flowing from the first orifice to produce modulation pressure.

Claim 2

Dependent Claim 254 words

A fluid pressure control device of a transmission for use in a vehicle having selector valve means, a fluid torque convertor having first and second frictional engaging means for controlling hydraulically plural hydraulically operated frictional engaging means to produce plural speed change ratios, and a planetary gear mechanism, comprising a pressure control valve provided between a source of pressurized fluid and speed selector valve said control valve having a solenoid value controlled by an electronic control circuit connected to said source and having a pressure regulator valve provided within a cylindrical valve, a timing pressure valve provided for controlling said cylindrical valve and having first and second orifices provided therein and connected to constant pressure wherein said first orifice controls said cylindrical valve and a third movable orifice engaged with the outlet of said second orifice wherein the electric signal of the solenoid valve for moving the orifice is connected to the electric signal of a solenoid for operating said speed selector valve by the operation of said electronic control circuit which includes an OR-circuit, differential circuit and monostable multivibrator so that when a speed transfer signal is produced, said movable orifice is always opened, and the control back pressure of said cylindrical valve is quickly drained by utilizing the pressure difference between the second orifice of said timing pressure valve whereby the pressurized fluid to the clutch is lowered to initial regulator pressure, and thereafter said cylindrical valve is moved by the control current flowing from the first orifice to produce modulation pressure.

Claim 3

Dependent Claim 193 words

A fluid pressure control device as set forth in claim 1 wherein said pressure control valve is coupled between a source of pressurized fluid and speed selector valve said pressure control valve comprising valve body, a valve spool inserted into said valve body wherein standard pressure is applied to one end surface thereof and a hole is formed at the other end surface thereof, a stationary orifice supplied with the standard pressure, a control chamber provided in series therewith, a spring inserted into said control chamber so that said valve spool is biased, a movable orifice provided to drain said control chamber and opened or closed by a solenoid energized by switching tRansistor, wherein the pressure of said control chamber is lowered by opening said movable orifice, said valve spool is moved by the difference with the standard pressure, when the movable orifice is closed, said control chamber pressure is reset to the standard pressure and said spool is returned by the force of said spring to regulate the amount flown for correcting the capacity change of the control chamber to control the moving time of said valve spool by said stationary orifice.

Claim 4

Dependent Claim 58 words

The hydraulic speed change control device of claim 1, wherein the internal peripheral wall of the cylindrical valve is formed with a plurality of radial ports adapted to be connected to an inlet port, torque converter port and drain ports, and said cylindrical valve is normally biased by a spring towards the right hand of the valve body.

Claim 5

Dependent Claim 38 words

The hydraulic speed change control device of claim 3, wherein the pressure regulating valve has a reduced diameter portion in the middle thereof and being normally biased by a spring in the same direction as the cylindrical valve.

Claim 6

Dependent Claim 68 words

The hydraulic speed change control device according to claim 4, wherein at the opposite end of the pressure regulating valve from the spring is a piston having an orifice and a load piston and a spring interposed between said piston and load piston to form a space which communicates through said orifice and a passage in said pressure regulating valve with a radial port in said cylindrical valve.

Claim 7

Dependent Claim 31 words

The hydraulic speed change control device according to claim 1, wherein the face of the pressure valve exposed to the pressure chamber is normally biased by a spring toward the port.

Claim 8

Dependent Claim 76 words

The hydraulic speed change control device according to claim 6, wherein the solenoid valve is comprised of a solenoid with a valve chamber and a piston valve normally biased by a spring onto a valve seat, the valve chamber being in communication with said pressure chamber of said pressure valve by a passage, and an orifice in said valve seat adapted as a means to communicate a drain port with said passage to said pressure chamber.

Claim 9

Dependent Claim 125 words

The hydraulic speed change control device according to claim 2, wherein the spool is mounted to connect or disconnect the clutch port with a drain port, the spool is biased by a spring in the pressure chamber at one end and the orifice communicates both end faces of the spool by means of a passage formed axially of the spool, and the solenoid valve is comprised of a valve chamber, a piston valve normally biased towards a valve seat by a spring mounted within the solenoid valve chamber, with said piston valve adapted to open and close an orifice which communicates with a drain port by a passage, said passage connecting the pressure chamber at one end of the spool with the solenoid valve chamber.

Claim 10

Dependent Claim 34 words

The hydraulic speed change control device according to claim 8, wherein in the valve body a port and a drain are provided on the opposite side of the clutch port and the drain port.

Claim 11

Dependent Claim 76 words

The hydraulic speed change control device according to claim 9, wherein the mechanism for control of the return of hydraulic fluid constitutes a series of similarly constructed valves whose pressure chambers at the end of the spool opposite the biasing spring are connected by a common passage, the clutch ports of the various valves in the series are connected with clutches, and the inlet ports are connected with ports to control the flow of hydraulic fluid.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-03-31	1978-09-30	1979-04-01	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-03-31	1982-09-30	1983-04-01	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-03-31	1986-09-30	1987-04-01	$7700.00	Window Closed / Lapsed

Hydraulic speed change control device

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