210 results about "Automatic transmission fluid" patented technology

Automatic transmission fluids are described which contain at least 0.2 wt % of a metal-containing detergent, a dispersant, and a mixture of friction modifiers. The transmission fluids according to the present invention exhibit excellent initial anti shudder properties, excellent anti-shudder durability, and excellent friction durability.

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.

Compositions comprising an oil of lubricating viscosity; an amide represented by the formula R1R2N—C(O)R3 wherein R1 and R2 are hydrocarbyl groups of at least 6 carbon atoms and R3 is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent; a nitrogen-containing dispersant; and a phosphorus-containing compound are suitable for lubricating a transmission.

Provided is an electric motor having improved overall cooling efficiency by enabling a coolant to flow around a stator and around and through a rotor in parallel for the stator and the rotor to allow the stator and the rotor to be cooled in parallel. In the electric motor, after an automatic transmission fluid flowing into a first coolant inflow port (10) passes through a shaft internal flow path and rotor internal flow paths (27), the automatic transmission fluid passes through a coolant exhaust port (20) to flow out of a housing (18). After the automatic transmission fluid flowing into a second coolant inflow port (11) passes through a clearance (31) between the housing (18) and a stator (17) and around coil ends (29) of stator coils (16), the automatic transmission fluid passes through the coolant exhaust port (20) to flow out of the housing (18).

A hybrid electric vehicle is arranged such that a driving force of an engine and a driving force of an electric motor can be transmitted to driving wheels through an automatic transmission having a plurality of forward gears. When it is detected that the vehicle is in a predetermined state in which it is difficult for the electric motor to output an upper limit torque predetermined as a generable maximum torque, a vehicle ECU controls the automatic transmission using a gear shift map configured such that the automatic transmission is downshifted earlier in accordance with a change in the operating state of the vehicle and upshifted later in accordance with a change in the operating state of the vehicle in comparison with a gear shift map that is used when it is not detected that the vehicle is in the predetermined state.

In a segment-type wet friction material, an inner peripheral left corner of one segment piece and an inner peripheral right corner of another segment piece are respectively cut off at a fixed angle to a center line of an oil groove. The oil grooves have first oil grooves and second oil grooves. The second oil groove has nearly a uniform width. The first oil groove has an inner peripheral corner portion that is broadened to the center line of the oil groove from a fixed height. In case of being assembled in an automatic transmission, when the segment-type friction material rotates in one direction, an automatic transmission fluid supplied from an inner circumference bumps and touches the portion that is broadened at the fixed angle at a rear side in the rotating direction. Thus, the automatic transmission fluid is positively supplied to a friction surface of the segment piece so as to restrain a contact between a separator plate and the friction surface. Consequently, excess automatic transmission fluid is discharged from the second oil groove, thereby reducing largely a drag torque by the automatic transmission fluid.

The invention discloses a wear resistance improvement automatic transmission fluid, relates to an automobile automatic transmission fluid, and mainly aims at solving the problems of non ideal wear resistance and antioxidant properties of automobile automatic transmission fluids in the prior art. The composition comprises base oil accounting for 85.0 to 97.0% of the total weight; a viscosity index improver accounting for 0.2 to 10.0% of the total weight; an anti-wear reagent at extreme pressure, accounting for 0.2 to 2.0% of the total weight; an antioxidant accounting for 0.05 to 2.0% of the total weight; an antioxidant anticorrosion anti-wear agent accounting for 0.02 to 1.0% of the total weight; a dispersant accounting for 0.1 to 3.0% of the total weight; a detergent accounting for 0.05 to 2.0% of the total weight; an anti rust agent accounting for 0.05 to 3.0% of the total weight; a metal deactivator accounting for 0.02 to 3.0% of the total weight; a pour point depressant accounting for 0.2 to 8.0% of the total weight; and an antifoaming agent accounting for 0.0001 to 0.02% of the total weight. The wear resistance improvement automatic transmission fluid has the advantages of good wear resistance and antioxidant properties.

A control apparatus for a vehicle having an engine and an automatic transmission includes a rotational speed detection unit that detects the engine speed; a temperature detection unit that detects the temperature of automatic transmission fluid; an calculation unit that calculates a degree of agitation of the automatic transmission fluid based on the detected engine speed and the automatic transmission fluid temperature; an adding unit for adding the calculated degree of agitation to a previously calculated degree of agitation; and a control unit for controlling the automatic transmission based on the sum degree to prevent increasing the degree of agitation.

The automatic transmission fluid filter includes a plastic upper case having an outlet port, a plastic lower case having an inlet port, and a filter element including a filter medium and a plastic holder frame holding the periphery of the filter medium and held between the upper case and lower case, at least one of the upper case and lower case including a pair of joint portions respectively joined to opposite walls a of the holder frame, and a connecting wall connecting the pair of joint portions and having a circular arc longitudinal cross section protruding outward of one case.

Provided is an electric motor having improved overall cooling efficiency by enabling a coolant to flow around a stator and around and through a rotor in parallel for the stator and the rotor to allow the stator and the rotor to be cooled in parallel. In the electric motor, after an automatic transmission fluid flowing into a first coolant inflow port (10) passes through a shaft internal flow path and rotor internal flow paths (27), the automatic transmission fluid passes through a coolant exhaust port (20) to flow out of a housing (18). After the automatic transmission fluid flowing into a second coolant inflow port (11) passes through a clearance (31) between the housing (18) and a stator (17) and around coil ends (29) of stator coils (16), the automatic transmission fluid passes through the coolant exhaust port (20) to flow out of the housing (18).

The invention provides an automatic transmission fluid combination comprising base oil of main amount and additive of minor amount. The combination comprises the following components by taking the gross weight of the combination as benchmark: (a) at least one amine salt of organic phosphate; (b) at least one dispersant; (c) at least one antioxidant; (d) at least one detergent; (x) allowance of the base oil of synthesized lubricating oil. Due to the combined use of the amine salt of organic phosphate of a new structure with the ashless dispersant, the antioxidant and the detergent, the automatic transmission fluid provided by the invention has good antiwear performance and friction property, thus according with Dexron VI and Allison C-4 specification requirements.

Antifoam compositions for functional fluids contain antifoam agents comprising perfluoropolyether compounds (PFPE). An automatic transmission fluid is provided containing the antifoam composition in a lubricating base oil, along with conventional additives such as antiwear agents. Automobile transmissions are provided that contain an automatic transmission fluid containing the new antifoam compositions. In a further embodiment, methods are provided for reducing foam in an engine oil or unwanted noise in an automobile transmission during operation, comprising lubricating the engine or transmission with a lubricating fluid containing the antifoam compositions of the invention.

Compositions comprising an oil of lubricating viscosity; an amide represented by the formula R1R2N—C(O)R3 wherein R1 and R2 are hydrocarbyl groups of at least 6 carbon atoms and R3 is a hydroxyalkyl group of 1 to 6 carbon atoms or a group formed by the condensation of said hydroxyalkyl group, through a hydroxyl group thereof, with an acylating agent; a nitrogen-containing dispersant; and a phosphorus-containing compound are suitable for lubricating a transmission.

An automatic transmission fluid (ATF) filtration system that combines both coarse filtering mesh and microfine depth filtering elements simultaneously to remove a wide range of particulate matter, but also maintains an unrestricted flow of ATF to the pump to ensure its volumetric efficiency is disclosed. In the present invention ATF at system pressure is delivered via a hydraulic circuit to a microfine depth filtering element for depth filtration (i.e. several layers of filter media) and, thereafter, is passed into the intake of the coarse filter element or, alternatively, between the intake of the coarse filter element and the pump intake. Because ATF flow through the coarse filter element is continuous and independent of the microfine depth filter element, the volumetric efficiency of the pump is maintained in all phases of operation even at the highest demand points such as at cold start-up, hot idle, and high volume / demand situations.