Abstract: The link belt for power transmission for a continuously variable transmission, with individual links (2) and a ring package (3, 5), which holds the links (2) together, contains an additional, outer ring package (4) for the purpose of absorbing the radial forces generated on the links (2) is provided, which is arranged around the link belt (1) and is mounted such that it can no longer rotate along with the link belt (1), however is still able to follow the strip's adjusting movement, wherein the ring package (5) ensures that the links are guided and held together.

Abstract: A method of adjusting an operating temperature of a control device (2) of a motor vehicle automatic transmission. The transmission control has a hydraulic unit (3) and an electronic unit (4) with electronic modules. The control device (3)is situated in a transmission housing which is partially filled with transmission oil and at least partly surrounded by transmission oil. The control device (2) has a cooling device (5) by which at least part of the electronic unit (4) is cooled with the transmission oil. The transmission oil has a temperature &THgr;C which is lower than a prevailing transmission oil temperature &THgr;G. The electronic unit (4) is impinged upon with a defined volume flow of the transmission oil.

Abstract: A method for protecting a variator in a continuously variable belt-type transmission of a motor vehicle, simultaneously with a calculation based on an engine signal containing the magnitude of the engine torque and subsequent conversion of a contact-pressure theoretical value, providing the added safety on the variator, that the contact pressure on the variator is measured by a pressure sensor and the maximum transmissible transmission input torque is calculated with reference to this value. The maximum transmissible transmission input torque is then compared with the engine torque to the transmission and in case the maximum transmissible transmission input torque is less than the engine torque, an engine interruption is effected.

Abstract: The invention concerns an oil supply system for an automatic transmission of a motor vehicle having one hydrodynamic starting element. It has one oil pump (2) to convey oil to a variator (9, 10) and/or to shifting elements (12, 13), to a converter unit (19) that can be supplied with oil via two oil lines (23, 25), especially a hydrodynamic torque converter (20) having a converter lock-up clutch (21), and to a lubrication device (28), the same as at least one filter device (3, 31) and one oil cooling device (17). Here are provided one prioritized primary circuit (6) with a main pressure adjusted by a main pressure valve (3) for pressure supply of the variator (9, 10) and/or of the shifting elements (12, 13) and a secondary circuit (7) for oil supply of the lubrication device (28).

Abstract: The invention relates to a method for manually stipulating the transmission ratio of a continuously variable transmission (CVT) for a motor vehicle. The CVT comprises a control device, a shifting or selecting device, a starting element and a variator for adjusting the transmission ratio which is driven, in particular, by an internal combustion engine. The control device processes input signals derived from a driver-vehicle system within the framework of an operational strategy for stipulating the transmission ratio, the rotational speed of the drive motor or a variator input rotational speed. In a first automatic operation mode, the operational strategy automatically selects the transmission multiplication. In a second manual operational mode, the driver can directly intervene, via the shifting or selecting device, in the selection of the transmission multiplication.

Abstract: Within the scope of the method for compensating angular misalignments for the variator of a continuously variable belt-drive transmission having cone pulleys disposed in pairs and one pushing linked band as torque transmitting belt-drive element, the fixed cone pulley of a variator side is designed with a curved outline, a pushing link displacement path being calculated with reference to a crowned pushing link flank outline and then the pushing link displacement path to the other side of the variator is calculated so that the displacement path is free of angular misalignment.

Abstract: In an automatic transmission for a motor vehicle which is controlled by an electronic transmission control device which continuously exchanges signals with a digital engine electronic system of an internal combustion engine, to reduce the thermal load on the automatic transmission in emergency operating mode, a transmission-independent program module (M1) of the digital engine electronics system presets an admissible maximum engine torque for the emergency operating mode (M_mot_max_not).

Abstract: The device for controlling a CVT transmission which is connected with a pendulous drive, especially an internal combustion engine for a motor vehicle having front-transverse drive, has a hydromotor simultaneously used as sensor and actuator, the output signal of which is a function of the size and of the dynamics of the engine torque, the same as an electrohydraulic control unit which controls the actuating areas of the primary and secondary pulleys of the CVT via electromagnetic actuating elements and hydraulic valves. In addition to pressure-regulating valves, pressure-reducing valves and at least one emergency valve, the device has a coupling of the hydromotor with the second pressure-reducing valve via a line which coupling is used for torque modulated control of the second pressure-reducing valve in an emergency operating mode.

Abstract: Within the scope of the method for adjusting the ratio value for a continuously variable transmission having a variator, a minimum contact pressure force P1,min, and/or P2,min is continuously calculated for the two variator discs on the basis of the actual ratio and of the actual torque to be transmitted and according to the calculated contact pressure minimum force the primary or the secondary disc is determined as controlled variable to be used for the variator ratio, the controlled variable being determined by a comparison of the required pressure values P1,soll or P2,soll with the calculated contact-pressure minimum value in a manner such that if P1,soll≦P1,min, the controlled variable changes from the primary to the secondary side and if the condition P2,soll≦P2,min is fulfilled, the secondary side changes to the primary side, the primary side being the controlled variable at the start of the method.

Abstract: The method for monitoring the system pressure of a continuously variable transmission for motor vehicles which, via a permanent mechanical connection, is connected with the prime mover of the motor vehicle consists in that a warning signal is activated for the driver when a drop in system pressure is detected, an entry is made in the transmission fault memory, the clutch on the output side is opened, a signal is sent to the electronic engine control system to prevent uncontrolled acceleration of the engine and the vehicle speed is monitored until it falls below a preset threshold value after which the engine is switched off.

Abstract: A method is described for control of a CVT automatic transmission (1) in which a sensed main pressure (p_hd_act) and a sensed contact pressure (p_s2_act) of a secondary pulley (7) are entered as signals in an electronic transmission control (8). For diagnosis of an error in the sensing of the main pressure (p_hd_act) and/or of the contact pressure (p_s2_act) of the secondary pulley (7) their actual values or comparison variable (|p_hd_act-p_hd_nom|, |p_s2_act-p_s2_nom|) formed therefrom are compared with applicable threshold values (p_hd_min, pd_phd_regdiff, p_s2_min, pd_ps2_regdiff) associated with a range of plausible pressure values.

Abstract: The invention is based on a radial piston pump (1) with a pump body (2), in which pump body (2) are placed pistons (4), and cylinders (5) arrayed radial to a cam (14) and the pistons (4) upon an inward thrust suck in fluid by means of suction side intakes (17) and upon an outward thrust, the pistons (4) impel fluid through pressure openings (7) in the outer end walls (6) of the cylinder (5) into a plenum (10). It is proposed, that in the base of the cylinders (4) respectively a connection boring (32) is made to the cam (14), which connection boring (32) is controlled by a relief valve (18). Upon the exceeding of its opening pressure the relief valve (18) opens and pressure peaks in the cylinder (5) can be diminished by means of said connection boring. At the same time, a pressure buffer between the base of the piston (4) and the bearing shell (16) is formed.

Abstract: Within the scope of the method for regulating the rotational speed difference of a switchable frictional engagement control, specially of a clutch or brake, in the driving train of a motor vehicle by means of a control closed loop with the desired rotational speed difference as reference input and the actual rotational speed difference as controlled variable, together with the clutch pressure or brake pressure to be adjusted, at least one other controlled variable is used, wherein the closed loop comprises a linear governor and damping members (TP1, TP2, TP3) in a manner such that the time shift of the damped variable per reading step does not exceed a predetermined value so that the exciting of the closed loop remains within a stable range for controlling.

Abstract: Within the scope of the method for controlling the engine rotational speed via the torque converter lock-up clutch during the starting and stopping phases of a motor vehicle having a continuously variable transmission combined with other elements of the drive train, the closing and opening of the torque converter lock-up clutch are used as implicit function so as to ensure optimum comfort via the most asymptotic adjustment possible of the rotational speeds gradients of engine and turbine during starting and by a soft, defined separation of the speed characteristic curves of the engine and turbine during stopping. When the vehicle is standing still the forward clutch is moved into standstill disengaged mode so that the torque converter lock-up clutch can be fully closed.

Abstract: In a method for controlling the multiplication for a continuously variable transmission with electrohydraulic control by means of a control loop having a linear PID controller with the specified multiplication of the variator iv_soll as command variable, the actual multiplication iv as regulating variable and the multiplication changing speed as correcting variable, the correcting variable delivered by the PID controller is limited to limiting values determined by the design for an upshift and downshift wherein said limiting values are calculated form the limits determined by construction and from the operating-point dependent limits determined by volume flow and the intersection of both admissible intervals determined by construction and by volume flow is defined as admissible multiplication changing speed range.

Abstract: The automatic transmission for a motor vehicle having one starting element, one input shaft, one output shaft and gear sets for determining the reduction ratio and having one planetary reversing gear for reversal of direction of rotation of the input shaft. In the planetary reversing gear is situated one ring gear consisting of one ring (1) with inner teeth and with a smooth outer wall and of one disc carrier (2) segmentally welded on the ring.

Abstract: The invention is based on a radial piston pump (1) with a pump body (2), in which pump body (2) are placed pistons (4), and cylinders (5) arrayed radial to a cam (14) and the pistons (4) upon an inward thrust suck in fluid by means of suction side intakes (17) and upon an outward thrust, the pistons (4) impel fluid through pressure openings (7) in the outer end walls (6) of the cylinder (5) into a plenum (10) whereby the check valves (22) are formed from an annular coil spring valve (9) which cover the pressure ports (7) and the thereto connected stress relieving corrugations (8), and upon the exceeding of a specified threshold transport pressure, the respective pressure opening (7) opens to the plenum (10). The proposal is made, that a stress relieving zone (27) of a piston-cylinder unit (4, 5) be connected to the pressure zone (5, 7, 26) of a neighboring piston-cylinder unit (4, 5).

Abstract: An arrangement for operating a CVT transmission of a motor vehicle is proposed which comprises a hydraulic circuit supplied from a hydraulic pressure source (8) having two parallel second branches (16, 17) attached to the first branch (9) of the hydraulic circuit each for supplying pressure to a hydraulic actuator (4, 5) for respectively a cone pulley pair (2, 3) of the transmission wherein with the first branch (9) and each second branch (16, 18) an independently controllable pressure valve system (12, 13, 18, 19, 20, 21) is associated for adjusting the hydraulic pressure in the respective branch (9, 16, 17). According to the invention at least one of the pressure valve systems (18, 19, 20, 21) associated with the second branches (16, 17) has a controllable pressure-differential valve (18, 19) connected between the first branch (9) and the second branch (16, 17) concerned.

Abstract: An automatic transmission having at the input a starting element (4), a reversing set (46), a first electronic control unit (65) and a cone pulley (29) fixedly supported on one primary shaft (18) and axially thereto a hydraulically adjustable cone pulley (30), both pulleys forming a primary variator part (19). In addition there is a cone pulley (31) fixedly supported on a secondary shaft (21) and axially thereto a hydraulically adjustable cone pulley (32) together forming a secondary variator part (20) wherein a belt-type organ (37) between the cone pulleys (29, 30, 31,32) drivingly connects the primary variator part (19) with the secondary variator part (20).

Abstract: The device for the contactless measurement of the rotational speed of a first part which rotates during operation and which is arranged inside a second part that either does not rotate or rotates at a rotational speed that is independent of the rotational speed of the first part, has an arrangement which generates a magnetic field and a magnetic field detector, wherein the arrangement which generates the magnetic field has a magnet ring (4) integrated in the inner part (1) and wherein the magnetic field detector is a Hall-effect sensor (3) situated in a housing (6) that surrounds both parts: the second part (2) consists of a non-magnetizable material.