Showing papers by "Toyota published in 1970"

Automatic shift control system for automatic transmission

Abstract: An automatic shift control system for an automatic transmission comprising a mountainous area circuit having an acclivity detecting means, a brake fluid pressure detecting means and a computing means so that the shift pattern can be automatically changed depending on the variation in the driving conditions and the vehicle can run in a mountainous area while preventing the gear from frequently shifting to high gear and maintaining same in low gear.

Vented fuel tank

Abstract: A fuel tank comprising a fuel tank body, a first vent pipe, one end of which extends for a desired length into the tank body from an upper faceplate while its other end is in communication with the upper part of a fuel filling pipe which is connected at its lower end to the fuel tank body. For forming an air chamber having a desired capacity in the upper part of the tank body, the lower end of the fuel filling pipe opens into the inside of fuel tank body at a position below the lower opened end of the first vent pipe, a second vent pipe is provided with its lower end opening into the upper part of the fuel filling pipe and with its upper end opening into the atmosphere, and a third vent pipe communicating between the second vent pipe and the air chamber in the fuel tank body through a check valve. By means of the check valve the third vent pipe is opened into the atmosphere through the second vent pipe only when the fuel overflows out of the fuel filling pipe.

Internal combustion engine with sub-combustion chamber

Abstract: An internal combustion engine having a cylinder, including a main combustion chamber, in combination with a sub-combustion chamber provided with an ignition plug and communicating with the main combustion chamber through a small hole in a cylinder wall for jetting out the flame of air-fuel mixture ignited in the sub-combustion chamber to the main combustion chamber, the air-fuel mixture being supplied to the sub-combustion chamber through a suction tube from the same carburetor which feeds the main combustion chamber. The carburetor inlet of said suction tube is positioned upstream of a throttle valve and downstream of a venturi portion of the carburetor. A valve is placed at the outlet of the suction tube to the sub-combustion chamber and this valve may be interconnected with a main valve in the suction manifold leading from the carburetor to the main combustion chamber to move in synchronism therewith and with a piston in the cylinder, or it may be arranged to operate automatically in response to the difference of pressure within the sub-combustion chamber and the suction tube.

Process and apparatus for performing a simultaneous and combined press-forming and heat-treatment of steel stock

Abstract: The invention relates to a process for press-forming and heattreating a metallic stock for the manufacture of a specifically shaped product having locally different hardness distributions in specifically selected patterns. The forming and heating are performed in a simultaneous operation of the die press machine, whereby the stock is deprived of different amounts of heat at different temperatures in specifically localized zones.

Fuel tank construction

Abstract: Fuel tank construction comprises fuel tank with fuel pipe connected thereto. Fuel reclaim vessel has bottom portion positioned at higher elevation than top of fuel tank. Siphon tube has one end adjacent bottom of fuel tank and other end adjacent bottom of fuel reclaim vessel. Intermediate peak portion of siphon tube is positioned at higher elevation than filling port of fueling pipe. Pressure equalizing tube is between top of fueling pipe and fuel reclaim vessel, and an exhaust pipe is connected to fuel reclaim vessel in order to exhaust air and fuel vapor in the vessel.

Disc brake anti squeal means

Abstract: A disc brake of simple construction wherein a supporting member of elastic material is disposed between the cylinder and piston in such manner as to allow the piston to move axially along the cylinder and to vibrate synchronously with the cylinder in the radial direction of the piston, thereby to prevent coupled vibration of the piston and the brake friction pad and to eliminate brake squeal.

Electrolyte circulating battery

Abstract: AN ELECTROLYTE CIRCULATING BATTERY HAVING A PLURALITY OF CELLS ELECTRICALLY CONNECTED IN SERIES AND SUPPLIED WITH CIRCULATING ELECTROYTE, WHEREIN THERE IS PROVIDED A MAIN ELECTROLYTE INLET PASSAGE AND BRANCHED INLET PASSAGES LEADING THEREFROM TO EACH CELL, AND BRANCHED OUTLET PASSAGES LEADING FROM EACH CELL TO A MAIN ELECTROLYTE OUTLET PASSAGE, THE BRANCHED INLET AND OUTLET PASSAGES BEING MADE SUFFICIENTLY LONG AND OF SUFFICIENTLY SMALL CROSS-SECTION TO PREVENT PASSAGE OF ANY SUBSTANTIAL AMOUNT OF INTERNAL CURRENT BETWEEN CELLS, GAS, SUCH AS AIR AND OXYGEN, IS INTRODUCED INTO THE BRANCHED INLET END AND/OR OUTLET PASSAGES THROUGH NEEDLES TO FORM BUBBLES IN THE ELECTROLYTE, THEREBY FURTHER INCRESING THE ELECTRIC RESISTANCE IN SAID BRANCHED PASSAGES.

Electrical automatic shift control system with hilly country detecting unit

Abstract: The present invention relates to an electrical automatic shift control system with a hilly country detecting unit which is adapted for use with an automatic transmission for automobiles comprising a fluid type torque converter transmission with a speed change gear, friction engaging means for accomplishing shifting gear engagements of the speed change gear, and a hydraulic actuation circuit for controlling the friction engaging means. The automatic shift control system comprises a climbing road condition logic circuit, a downhill road condition logic circuit and a memory circuit, whereby it functions such that the control unit of the torque converter for effecting normal automatic gear changes in a hilly country is properly restrained from changing to top gear thereby automatically and easily preventing the transmission from changing to top gear on inclines and declines and on curved roads, while this hilly country driving condition is released upon changing into level road running.

Hydraulic control system for an automatic transmission

Abstract: A hydraulic control system is provided for an automatic automotive vehicle transmission of the type including a gear changing unit, such as a planetary gear unit, having brakes and clutches controlled by hydraulically operated servo units, and including hydraulic torque transmitting means, such as a torque converter, coupling the gear changing unit to the vehicle engine. The hydraulic control system includes a cutoff valve hydraulically associated with a pressure regulator valve and other related control valves. The cutoff valve operates as a line pressure regulator when the pressure regulator valve is rendered ineffective in set positions of a manual speed selector valve. In particular, the cutoff valve becomes effective, with the pressure regulator valve becoming ineffective, when the speed selector valve is moved into the "reverse" position. The cutoff valve provides a higher control pressure for the servo units, during gear shifting in the reverse range, than the control pressure available for the servo units during gear shifting in the ordinary forward driving range.

Process and apparatus for the partial or localized tempering of a steel sheet-or the like stock

Abstract: This invention relates to a process and apparatus for the localized temper treatment of a steel diaphragm clutch spring. In the inventive process a pair of die members adapted for cooperation with each other and having each a working surface to cover a local area of the steel diaphragm spring to be locally tempered is heated to a temperature at least a tempering temperature of the diaphragm spring and then the diaphragm spring is placed between the die members and squeezed therebetween under pressure, thereby the diaphragm spring being heated up to its tempering temperature at said local area to be tempered through heat conduction from the dies to the diaphragm spring. The inventive apparatus comprises in combination: a first and second die members relatively movable towards and from each other; heating means attached to each of said die members for heating them at a temperature above the tempering temperature forming to its desired shape when squeezed between the cooled die members under pressure.

Electric fuel injection control system for internal combustion engines

Abstract: In internal combustion engines, where the fuel injection valves are electromagnetically operated, at the time of engine acceleration the amount of fuel injected is increased by converting sudden changes in such parameters as the negative pressure in the engine intake manifold into corresponding changes of the mechanical type, such as by the displacement of a diaphragm, according to which mechanical changes an electric fuel injection control is operated. Thus, a delay time is involved, resulting in an insufficient response characteristic. In the specification, there is disclosed an electric fuel injection system for internal combustion engines, comprising; a means to generate electric signals corresponding to the speed of motion of the throttle of the engine or particularly when the speed of the throttle motion exceeds a predetermined value; and a means to increase the amount of fuel delivered for acceleration by so controlling fuel injection valves upon reception of the signal from the first means.

Speed change gear device

Abstract: A speed change gear device which comprises a relatively small number of planetary gears and associated parts and which is especially applicable to the transmission mechanism of a smallersized automotive vehicle. The speed change gear device employs additional brake means to fix an input member of a planetary gear train to the gear case to furnish a greater speed change ratio or a greater number of speed change steps without increasing the number of gears in the planetary gear train.

Hydraulic pump or motor having a rotary cylinder barrel

Abstract: A hydraulic pump or motor having a rotary cylinder barrel for axially reciprocating pistons for use with externally supplied fluids comprising a housing, a rotating cylinder barrel mounted slidably only in the axial direction on a drive shaft secured within said housing, an inclined swash plate at one end of said housing for regulating the reciprocating of pistons disposed within the pumping chambers of said barrel, a valve plate interposed between the other end of said barrel and the internal forward portion of said housing in slidable contact therewith, said valve plate having slots for the passage of low pressure and high pressure fluids therethrough and oscillating at the coacting surfaces of the cylinder barrel and the valve plate itself. The valve plate is further provided with means compensating the tilting moment acting on said valve plate, said compensating means including at least one balancing piston movably positioned to a radius direction of said valve plate and being operated by pressure fluid delivered from said slot positioned at the high pressure side of said valve plate during rotation of said barrel, and thereby assuring the fluid sealing between said co-acting surfaces.

Safety method and apparatus for vehicle passengers

Abstract: In a method for protecting passengers in a moving vehicle, radio signals having a predetermined propagation speed and frequency are transmitted from the moving vehicle to an approaching object, such as a second vehicle. Radio signals reflected from the approaching object, and having a different frequency, are received in the moving vehicle. The difference frequency corresponding to the relative speeds between the two vehicles or between the moving vehicle and an object is obtained by utilizing the change in frequency of both signals caused by the Doppler effect, and the level of the reflected signal, corresponding to the distance between the moving vehicle and the approaching object, is concurrently determined. The time remaining before collision of the moving vehicle with the object or another moving vehicle, if the moving vehicle and/or the other vehicle keep advancing, is determined by multiplying the difference frequency by the level of the reflected signal, to produce a signal inflating air bags within such remaining time. The apparatus comprises means for transmitting and receiving radio signals, means for obtaining the difference frequency between the transmitted and reflected signals, a converter operable to convert the difference frequency to an electrical quantity, such as a voltage, and a converter operable to convert the level of the reflected signal to an electrical quantity, such as a second voltage. The apparatus further includes a multiplier to multiply the two electrical quantities to produce actuating signals when the multiplied value exceeds a predetermined value of the remaining time, and includes means for inflating the air bags, responsive to the actuating signals, within the remaining time.

Split hydraulic braking system

Abstract: A hydraulic brake system is formed of two separate hydraulic circuits, one for the front wheels and the other for the rear wheels of an automotive vehicle. Both circuits are connected hydraulically to a master cylinder and one of the hydraulic circuits contains a control valve assembly for varying the pressure of the hydraulic brake fluid in that circuit. Means are provided in operative engagement with the control valve assembly for maintaining the valve assembly in the inoperative condition when a failure occurs in the other circuit. As a result of the failure, the circuit containing the valve assembly operates at the pressure supplied from the master cylinder.

Process for cold plastic forming of spaced tooth-like projections on a ring or similarly shaped member

Abstract: Spaced tooth-like projections are formed on the circumferential periphery of a ring-like body member by cold plastic forming operations carried out on an annular section made of a forgeable material which projects transversely from the body member. The annular section has a substantially rectangular cross-section with a pair of spaced transversely extending face surfaces. Initially, while the ring-like member is supported against movement, alternate flat bottomed indentations and chamfered surfaces are formed in a pressing step on one of the transversely extending face surfaces. Next, grooves are extruded from the annular section between the chamfered sections so that the chamfered sections form an end, and the side surfaces of the grooves form sides of the tooth-like projections. The extruded material is cut off and the sides of the grooves are tapered by a working operation performed from the other one of the transversely extending face surfaces for completing the formation of the tooth-like projections.

Automatic transmission system having a shock preventing function in gear shifting

Abstract: An automatic transmission comprising as the essential units thereof a torque converter transmission, a hydraulic actuation circuit and electrical circuitry for controlling the distributor valve incorporated in the hydraulic actuation circuit, wherein the working oil pressure applied to the transmission is reduced according to a signal generated upon gear change so as to eliminate the shock caused during the gear change; whereas while the torque is being transmitted excepting during such gear change, the working oil pressure is maintained at a sufficiently high value in order to prevent the slippage of the friction engaging means in the transmission.

Actuating oil pressure control system for torque converter automatic transmission

Abstract: In a torque converter automatic transmission comprising a torque converter, a speed change gear having friction engaging means, and a hydraulic actuation circuit to supply pressure oil to the friction engaging means, an actuating oil pressure control system comprising a vehicle speed detecting circuit for generating an electrical signal corresponding to the vehicle speed, a load detecting circuit for generating an electrical signal corresponding to the vehicle loading, an operational circuit adapted to receive as the inputs thereto and operate on the output signals from said two detecting circuits in accordance with an equation so as to generate an output voltage, a sawtooth voltage having a constant period, a comparator circuit for comparing the output sawtooth voltage of the sawtooth wave generating circuit with the output voltage of the operational circuit to generate a rectangular voltage having a time width corresponding to said equation, and means for varying the actuating oil pressure of the oil under pressure supplied to the friction engaging means according to the output rectangular voltage of the comparator circuit, whereby said actuating oil pressure is controlled in accordance with variations in the time width of the output rectangular voltage of the comparator circuit.

Skid control system for automotive vehicles

Abstract: A skid control system for automotive vehicles having hydraulic brakes includes a wheel speed detector and a memory circuit connected to the detector to store the initial speed of the vehicle at the start of braking. A pressure detecting means is connected to the brake system to detect the fluid pressure during brake application, and a function generator converts the detected pressure into an arbitary function proportional thereto, and which is integrated. The integrated function is compared to the stored initial speed of the vehicle to derive a difference value which is amplified and supplied to a comparator connected to the wheel speed detector to provide a control signal. This control signal operates a servo mechanism to control the braking system in accordance with the control signal.

Integral shifting key for a synchronizing transmission

Abstract: Change gear synchronizer according to present invention is characterized by axially shifting keys integrally connected together and located between outside of clutch hub and inside surface of clutch hub sleeve. Sleeve is connected to rotate with clutch hub but is arranged to shift axially relative thereto. Integral nature of shifting key assembly prevents individual keys from popping out from between clutch hub and clutch hub sleeve. Integral assembly of shifting keys urges synchronizer ring into frictional contact with rotating gear to thereby provide smooth synchronizing action between rotating gear and clutch hub.

Process of forming a carbide layer of vanadium, niobium or tantalum upon a steel surface

Abstract: A process for the surface treatment of an iron or iron alloy stock comprising heating a mixture of boric acid or borate. A V-a group element of the periodic table consisting of vanadium, niobium and tantalum, or a substance containing the same, and carbon or a carbon containing substance to its fusing state in a bath vessel, and immersing the stock in the molten bath of said mixture, thereby forming a carbide layer of said element on the stock thus treated. The present invention can be performed without adding carbon to a mixture in the case when either said stock or said vessel includes carbon.

Ignition timing regulating device for internal combustion engines

Abstract: An ignition timing regulating device for internal combustion engines comprising a logical operation circuit, which receives discriminating output signals produced by comparing individual electric detection signals representing corresponding variables selected from the engine speed, vehicle speed, engine load and engine temperature condition with respective preset values and also an electric detection signal representing the gear position of the transmission as the inputs, and generates a single output signal, and an ignition timing shifting means to shift the spark timing in accordance with the output signal from the afore-said logical operation circuit

Apparatus for the removal of dewdrops from a dewed plate member

Abstract: This invention relates to improvements in and relating to an apparatus for the removal of accumulated dewdrops on a plate member, such as automotive front or windshield glass, mirror surface, gauge board or the like, by use of a hot airblast distributed over the dewed surface of the plate member. The apparatus according to this invention is characterized by the provision of a plurality of parallel rows of elongated blasting air-nozzle openings separated a lateral distance from each other, for the delivery of airblasts arranged in layers towards the glass surface.

Anti-skid device for vehicles

Abstract: An anti-skid device for vehicles comprising a wheel speed detector for producing an output signal upon detecting that the wheel speed is below a predetermined value, a first timer circuit for producing an output signal when the output signal from the wheel speed detector remains on for more than a definite time, and a second timer circuit for energizing the braking force modulator only for a definite time upon receipt of the output signal from the first timer circuit, whereby the locking of wheels due to a braking operation by the driver may be prevented.

Anti-skid device

Abstract: An anti-skid device for maintaining the slip factor of the wheels of a running vehicle constant is additionally provided with a second order phase-lead element whose constants are set to the optimum value with regard to the acceleration and deceleration vibration phenomena of the wheels under controlled conditions which characterize the dynamic characteristics of the anti-skid device, whereby an improved overall control performance of the system is ensured.

Anti-skid braking systems

Abstract: An anti-skid braking system which serves to modulate the pressure in the wheel brake cylinders of a vehicle to prevent the vehicle wheels from being locked when the normal proportional relationship between brake torque and wheel deceleration is no longer present. In order to modulate the pressure in the wheel brake cylinders, a pressure modulating valve is provided between the master cylinder and each wheel brake cylinder, the pressure modulating valve being responsive to a signal derived from a comparator circuit. The comparator circuit compares a signal responsive to brake torque and derived from a brake torque sensor, with a signal responsive to wheel deceleration and derived from a wheel deceleration operational circuit, to derive the first-named signal. The wheel deceleration operational circuit is adapted to convert a signal responsive to wheel speed and derived from a wheel speed sensor into said wheel deceleration-responsive signal. Preferably, both the comparator circuit and the wheel deceleration operational circuit are composed of fluid amplifier devices.

Pressure modulator assembly

Abstract: The assembly modulates the pressure of a working fluid, such as the brake fluid of an automotive vehicle, by the pressure of a control fluid, and includes an operating mechanism having a deflectable diaphragm, a working fluid pressure modulating mechanism operable by the diaphragm and including a pressure modulating piston controlling flow of working fluid through a working fluid line, and means biasing the diaphragm to a position in which the pressure modulating mechanism provides for substantially unrestricted flow to the working fluid line. A control fluid line is connected to the operating mechanism to apply, to the diaphragm, a control fluid pressure in opposition to the biasing means to operate the pressure modulating mechanism to restrict flow to the working fluid line. A throttle valve mechanism is included in the control fluid line to control the rate of control fluid relative to the operating mechanism, and the throttle valve mechanism is subjected to the pressure of the working fluid to vary the rate of flow of the control fluid as a function of the pressure of the working fluid. Application of the control fluid pressure is controlled by a valve operated by an anti-skid mechanism. The rate of flow of the control fluid may be varied as a direct function of the working fluid pressure, as an inverse function of the working fluid pressure, or as a combination of the direct and inverse functions of the working fluid pressure.

Abrupt brake application indicator for a motor vehicle

Abstract: A first switch, mounted in a brake pedal pad, turns on in response to slight pressure and remains on during continuance of the pressure. A second switch turns on when the brake pedal is moved or when the brake hydraulic pressure reaches a predetermined level. Closing of the first switch starts charging of a capacitor through a resistor. Closing of the second switch completes a circuit that turns on a brake lamp. The second switch also energizes a relay coil in the emitter-collector path of a transistor. If the decaying charging current through the resistor is still sufficiently high by the time the second switch is closed, the before-mentioned resistor biases on the transistor and operates the relay. The latter brightens the illumination of the lamp or flashes the lamp on and off. If, by the time the second switch is closed, the capacitor is already charged, no further charging current flows through the resistor. The transistor remains non-conductive and there is no change in the brake lamp. Thus, abrupt application of the brakes produces bright illumination or flashing illumination of the brake lamp. Normal slower application of the brake pedal produces a normal illumination of the lamp.

Shift control system for vehicle automatic transmission

Abstract: A shift control system for a vehicle automatic transmission including a transmission gear assembly and gear engaging means. The shift control system comprises both electrical and hydraulic controls and associated shift lever means, whereby the gear changing operation of the transmission is automatically controlled by the electrical control system according to the driving conditions thus providing a highly variable ratio transmission, while provision is made for the semiautomatic control of the transmission by means of the hydraulic circuit. The important features of both automatic and semiautomatic transmissions are thus embodied in one system.

Quenching oil compositions

Abstract: QUENCHING OIL COMPOSITION OF THE INVENTION COMPRISES MINERAL QUENCHING OIL CONTAINING A SPECIFIC COMPOUND BELONGING TO (1) ALIPHATIC ACIDS OR DERIVATIVES THEREOF, (2) PHOSPHITES, (3) THIOPHOSPHITES, (4) PHOSPHATES, (5) ZINC DIALKYL DITHIOPHOSPHATES, (6) DISULFIDES, (7) TETRAALKYLTHIURAM SULFIDES, (8) DITHIOCARBAMATES OR (9) MERCAPTANES, SAID COMPOUND BEING CONTAINED IN THE RANGE OF 0.05 TO 5 WWEIGHT PARTS, BASED ON 100 WEIGHT PART OF THE MINERAL QUENCHING OIL. THE PRESENT QUENCHING OIL COMPOSITIONS ARE CAPABLE OF QUENCHING METALS AND, AT THE SAME TIME, IMPARTING LUBRICATING PROPERTY TO THE METALS QUENCHED THEREWITH.