208 results about "Automatic transmission fluid" patented technology

The invention provides an automatic transmission assembly and an automatic transmission type automobile. The automatic transmission assembly includes an input shaft (1), a first-stage deceleration/speed-up mechanism (2), a continuously variable transmission mechanism (3), a two-stage deceleration/speed-up mechanism Speed-up mechanism (7), planetary mechanism (8) and output shaft (14), the automatic transmission assembly is distributed in-line, the input shaft (1) and output shaft (14) are arranged on the same axis, and the axis forms the automatic transmission The input-output main axis of the assembly The center of gravity of the entire transmission falls on or nearly falls on the input-output axis, which greatly enhances the balance performance of the transmission and the car.

An assembly for filtering contaminants from automatic transmission fluid includes a housing including a first inlet and a second inlet, through which fluid enters the housing, and an outlet, through which fluid exits the housing; a first media filter located within the housing in a first fluid flow path between the first inlet and the outlet; and a second media filter located within the housing in a second fluid flow path between the second inlet and the outlet.

The present invention relates to functional fluids, especially automatic transmission fluids showing surprising low temperature Brookfield viscosities and methods to produce them.

A composition of a major amount of an oil of lubricating viscosity; a secondary or tertiary amine being represented by the formula R¹R²NR³ wherein R¹ and R² are alkyl groups of at least 6 carbon atoms and R³ is hydrogen, a hydrocarbyl group, a hydroxyl-containing alkyl group, or an amine-containing alkyl group; and a dispersant, provides high static coefficients of friction and a durable positive slope during oxidative and mechanical stressing, particularly as a friction component of an automatic transmission.

There is provided an automatic transmission fluid composition comprising a major amount of a base oil; one or more friction modifiers, wherein total nitrogen content provided by the one or more friction modifiers is greater than or equal to about 300 ppm; and one or more ashless dispersants, wherein the total nitrogen content provided by the one or more ashless dispersants is greater than or equal to about 500 ppm. The automatic transmission fluid may have a kinematic viscosity at 100° C. of from about 4 cSt to about 6.5 cSt and a Brookfield viscosity at −40 ° C. of from about 4,000 cP to about 20,000 cP.

The invention relates to compositions comprising a blend of Group III basestocks and low volatility, low viscosity PAO basestocks. The blend is particularly useful for preparing finished lubricants that meet or even exceed the criteria for SAE Grade 0 W multi-grade engine oils. The combination of these low volatility, low viscosity PAOs with Group III basestocks provide, in embodiments, the necessary performance criteria in automatic transmission fluids, automotive or industrial gear oils, hydraulic fluids, or any other high performance lubricant requiring a combination of excellent low fluidity and low volatility.

The present invention relates to the use of a high level of a silicon-containing antifoam agent in automatic transmission fluid (“ATF”) applications. More specifically, the invention relates to a formulation and method for the reduction or elimination of pump whine that occurs in high-pressure pumps used to circulate transmissions fluids in vehicles. The invention also relates to fully formulated ATFs, to transmissions lubricated with such ATFs, and to vehicles containing transmissions lubricated with such ATFs.

An additive compound comprising a non-borated and/or borated reaction product, in which the reaction product is obtained by reacting a linear or branched, saturated or unsaturated monovalent aliphatic acid having 8 to 22 carbon atoms, urea, and polyalkylenepolyamine, when employed in a lubricating oil composition is favorably employable as an automatic transmission fluid of internal combustion engines.

The invention relates to compositions comprising a blend of Group II basestocks and low volatility, low viscosity PAO basestocks. The blend is particularly useful for preparing finished lubricants that meet or even exceed the criteria for SAE Grade 0W multi-grade engine oils. The combination of these low volatility, low viscosity PAOs with Group II basestocks provide, in embodiments, the necessary performance criteria in automatic transmission fluids, automotive or industrial gear oils, hydraulic fluids, or any other high performance lubricant requiring a combination of excellent low fluidity and low volatility.

An improved method and apparatus for detecting end-of-fill at a hydraulic clutch in an automatic transmission with a variable force solenoid are provided. The method includes: initiating clutch fill mode by commanding a high current to the solenoid whereby a high fluid pressure is delivered to the clutch apply volume; monitoring clutch fill time; determining if the fill time is greater than a threshold fill time; monitoring the current (e.g., actual and filtered) being actively drawn by the solenoid during clutch fill mode in response to the fill time being greater than the threshold fill time; detecting if an aberration occurs in the current; and stopping distribution of fluid to the hydraulic clutch in response to the current aberration. Detecting if an aberration occurs preferably includes determining a change in instantaneous armature velocity, and determining if the change in instantaneous velocity is greater than a threshold change in armature velocity.

A pump assembly includes an electric motor and different selectable pump covers, and is suitable for mounting within a transmission fluid reservoir for transferring automatic transmission fluid. The pump assembly includes a stator housing having a cylindrical cavity for receiving ATF contained in the transmission fluid reservoir. A rotor is rotatably coupled within the cylindrical cavity and has a plurality of magnets arranged about a rotational axis thereof. A flux collector is coupled with the stator housing adjacent to the cylindrical cavity for transferring magnetic flux from one of the plurality of magnets from a first portion to a second portion thereof. A hall sensor is disposed proximate the second portion for sensing magnetic flux in the flux collector, such that the magnetic flux is used to determine a rotated position of the rotor.

The invention relates to a testing method related to an oil pump assembly for an automatic gear box, which comprises the following steps: preparation stage on testing platform; set the preliminary working status; set oil temperature, rotation speed and oil pressure; check a singlechip to determine if all-round data collection is needed; if not, return to the said condition; if yes, collect data from all sensors; the singlechip processes all the sensing information in digital signal; the singlechip compares various temperature-flow rate curve, rotate speed-flow rate curve and pressure-flow rate curve with the theoretical ones, so as to test whether the deviation between the two is no more than 1 percent or not; the testing result can be output and the testing shall be finished if the parameters for all the oil pump have been qualified in the testing. Therefore, the invention verifies and improves the designed oil pump, as well as improves the performance and service life of automatic gear box and the hydraulic system.

An integrated design for dispensing lubricants and similar fluids from bulk containers incorporates a dispense valve (8), a meter (1), a hose (7), a DC powered electric pump (2), power cord (18) and adjustable fluid suction tube (5), all packaged in one portable unit. The unit is capable of dispensing fluids such as standard SAE grade automotive motor oils, automatic transmission fluid, gear lube, hydraulic oil and engine coolant (antifreeze). The pump motor will shut down at completion of dispense; and emergency shut-off to be provided.

An engine idle speed control device set a target idle speed NsetN for a non-traveling range is set to a high value to activate the catalytic converter early, after the engine is started. Upon detecting that the automatic transmission has been shifted from a non-traveling range to a traveling range, the target idle speed is lowered to a first traveling idle speed Nset1. A feedback gain G used for feedback control of the ignition timing is then set to a larger gain value. The larger gain value is set such that it varies based on the temperature of the automatic transmission fluid or other parameter indicative of the engine friction and/or automatic transmission friction. As a result, the ignition timing is retarded in a precise manner, the engine speed is reduced, and the clutch engagement shock is reduced.

A rubber composition contains an antifoam compound that leaches out of the rubber composition when placed in contact with a functional fluid. The antifoam compound is delivered into a functional fluid such as an automatic transmission fluid or an engine oil by contacting the functional fluid with the rubber composition. In addition to the antifoam compound, the rubber composition contains one or more elastomers, which may be selected from a wide variety of natural or synthetic rubbers. In a preferred embodiment, the elastomer comprises a high temperature elastomer such as acrylic elastomer and ethylene acrylic elastomer.

A phthalic acid such as terephthalic acid is made soluble in an oil of lubricating viscosity by first mixing it with at least one phosphorus compound. The resulting product is useful for reducing corrosion in a transmission lubricant.