265results about "Hydrodynamic brakes" patented technology

The invention relates to an automotive drive, comprising a cooling circuit with a coolant, a retarder having a rotor and a stator that together form a toroidal working chamber, with the coolant being the working medium of the retarder. The retarder has an inlet for feeding the working medium from the cooling circuit and an outlet for discharging the working medium into the cooling circuit. The present automotive drive is characterized by the following features: the retarder has an additional evacuation outlet, which communicates with the cooling circuit so as to carry the working medium; a leakage pump is interposed in the connection between the evacuation outlet and the cooling circuit.

The invention relates to a drive unit, comprising an internal combustion engine with a crankshaft; an exhaust line; an exhaust gas turbine which is acted on by the exhaust gas line, which is arranged downstream of the internal combustion engine and has the purpose of transmitting a positive torque to the crankshaft in the traction mode; a hydrodynamic unit which is arranged downstream of the exhaust gas turbine and has two turbine blades which form a torus-shaped working chamber; the hydrodynamic unit has a drive connection to the drive train; and a parking brake is provided for securing the primary turbine wheel of the exhaust gas turbine.

The invention discloses an auxiliary brake device applied to a non-drive axle. The auxiliary brake device applied to the non-drive axle comprises an axle shell of the non-drive axle, wherein shaft heads are respectively fixed at two ends of the axle shell, the outer surface of each shaft head is connected with a wheel hub through a bearing, a hydraulic retarder is arranged between the wheel hub and an end portion of each shaft head, each hydraulic retarder comprises a stator impeller fixed on the outer surface of the end portion of each shaft head and a rotor impeller which is covered outside each stator impeller and fixed with the wheel hub, and a hydraulic oil work cavity is formed between the inner surface of each rotor impeller and the outer surface of each stator impeller. An oil inlet pipe and an oil return pipe are arranged on the axle shell, each shaft head is provided with an axial through hole, each axial trough hole forms a part of an oil pipeline passage of each hydraulic retarder, and the oil inlet pipe and the oil return pipe are communicated with the hydraulic oil work cavities through the axial through holes in the shaft heads. The auxiliary brake device applied to the non-drive axle is capable of effectively improving the brake capacity of vehicles, especially a trailer, a semitrailer, a heavy truck and a large bus, and guarantees driving safety.

Method and arrangement for controlling or regulating total auxiliary brake torque in a motor vehicle. The device includes at least one first auxiliary brake (4) of a first type and at least one second auxiliary brake (4, 6) of a second type that is different from the first type. The second auxiliary brake (4, 6) can take the form of a retarder (4, 6). A control system (10, 17) is provided for controlling or regulating the auxiliary brake. Information is stored in the control system regarding characteristics of the respective auxiliary brake (4, 6) and at least one predefined limit value for maximally permitted auxiliary brake torque. The control system (10, 17) is designed such that, if the limit value is exceeded or if a request is made for the brake force from the auxiliary brakes (4, 6) to be moderated, then this is done by turning down or moderating, in the first place, the brake torque of the retarder (6).

The invention discloses an auxiliary downhill control system and control method based on a retarder. The auxiliary downhill control system comprises a signal acquisition unit, an electronic control unit and the retarder, wherein the signal acquisition unit is used for acquiring an opening signal of a brake pedal, an opening signal of an acceleration pedal and a vehicle speed signal; the electronic control unit performs logic judgment according to the three signals and automatically starts or quits an auxiliary downhill control program; after the auxiliary downhill control program is started, the electronic control unit calculates brake torque according to the state of the vehicle and controls the retarder to output the brake torque, so that the vehicle speed is in a proper level and is not increased any more. The retarder is taken as a control object, a control system is established, control strategies are formulated, automatic starting and quitting in an auxiliary downhill mode are realized, the vehicle speed is in a proper level and is not increased any more, the active safety of the vehicle is effectively improved, and the driving burden of a driver is reduced.

The invention relates to a braking device comprising a stator and a rotor. The rotor and the stator are positioned in relation to one another in such a way and a working medium can be supplied or connected in such a way that during a braking operation a braking moment is transferred from the rotor to the stator when the working medium is supplied or connected. The inventive braking device is characterised by the following: a fan impeller, which can enter into and be disconnected from a drive connection with the rotor by the activation and deactivation of a coupling; the fan impeller is configured and positioned in such a way that it supplies a stream of cooling air to the braking device, when the drive connection with the rotor has been made; the coupling is positioned and supplied with working medium in such a way that the supply or connection and evacuation or disconnection of the working medium automatically activates and deactivates the coupling.

The invention relates to a hydrodynamic retarder comprising - a rotor (1) and a stator (2) which form a working chamber (3) with each other; - a first working medium connection (6); - a second working medium connection (7); and - a working medium container (4) that has an outlet (10), which is connected to the first working medium connection via a line, and an inlet (11), which is connected to the second working medium connection via a line; wherein - the working medium container is made of two housing parts (8, 9), which are joined together along a parting line (12). According to the invention: - the two housing parts together enclose the working medium storage volume; - one of the two housing parts simultaneously forms a part of a retarder housing (14) which supports or forms the stator and partly forms all or some of the working medium-conducting connections between the working medium storage volume and the working chamber; and - a separating plate (13) is inserted between the two housing parts, said separating plate together with one or both of the housing parts forming cavities for the working medium-conducting connections and/or the working medium storage volume.

There is provided a retarder control device which is simple in constitution and can reliably apply braking. An engine rotational speed detector detects an engine rotational speed, gear step detection means detects a gear step of a transmission, an accelerator operation detector detects the operated state of an accelerator, and a retarder controller previously stores automatic braking amount determination data representing the relation between the engine rotational speed and the automatic braking amount of a retarder corresponding to each gear step of the transmission and controls the retarder according to the automatic braking amount of the retarder calculated from the automatic braking amount determination data based on the detected engine rotational speed and gear step of the transmission when the accelerator is judged to be off from the detected operated state of the accelerator.

The invention discloses a cooling-liquid medium type hydraulic retarding device for a vehicle. The cooling-liquid medium type hydraulic retarder comprises a hydraulic retarder and a control unit, wherein the control unit can control the working of the hydraulic retarder; the hydraulic retarder is arranged between a vehicle engine crankshaft and a flywheel, and is provided with a retarding working cavity. The cooling-liquid medium type hydraulic retarding device also comprises an inlet pipeline, an outlet pipeline, a pump, a returning pipeline, an inlet throttling valve and an outlet throttling valve; the liquid outlet end of a returning pipeline, the inlet pipeline, the retarding working cavity, the outlet pipeline and the liquid inlet end of the returning pipeline are communicated in sequence to form a circulating pipeline; the pump is connected in the circulating pipeline which is also communicated with a cooling-liquid cavity of an engine; the inlet throttling valve is connected on the inlet pipeline; the outlet throttling valve is connected with the outlet pipeline; the inlet throttling valve and the outlet throttling valve are respectively connected with the control unit in a control manner. The cooling-liquid medium type hydraulic retarding device disclosed by the invention has the advantages that the cooling liquid of the engine is adopted as a medium, the volume is small, the weight is light, the cost is low, the structure is compact, the installation is convenient and the retarding and braking torque can be effectively provided.

A coolant circuit of a motor vehicle, including the following features: a coolant, especially water or a water mixture; a coolant pump having a coolant outlet; a retarder provided with a central ring, the working medium thereof being the coolant; a reversing valve in the flow direction upstream of the retarder and a bypass section for bypassing the retarder, such that the retarder can be connected to and disconnected from the coolant circuit. According to the invention, the coolant pump is arranged in the flow direction upstream of the retarder in such a way that it pumps coolant into the retarder when the retarder is connected, and pumps coolant past the retarder via the bypass section when the retarder is disconnected.

A hydrodynamic braking system with a retarder including a rotor arranged in a rotor housing and a stator arranged in a stator housing, whereby the rotor and the stator together form a working space. The rotor is axially movable relative to the stator, from a first position (braking operating position) to a second position (non-braking operating position), and vice versa. The axial distance between the rotor and the stator in the non-braking operating position is a multiple of the distance separating them in the braking operating position. According to one aspect of the present invention the rotor housing includes an outlet that is located at a distance from the axis of rotation of the rotor and is open toward the rotor in the non-braking operating position such that the operating medium collected by the rotor is conveyed outside the working space through the outlet.

A system for controlling braking of a motor vehicle during downhill driving, in which the vehicle is provided with a service frictional braking device (18) and an auxiliary braking device (25), comprising a retarder brake (26) and a lever (40) for activating the retarder brake by the driver of the vehicle, comprises means (29) adapted to, upon activation of said retarder brake (26) by actuating said lever (40) by the driver for applying a braking action to the vehicle when driving downhill, based upon values of parameters of the driving conditions of the vehicle, calculate whether the auxiliary braking device is able to alone obtain said braking action to be applied to the vehicle. The braking control means (28) is adapted to activate the service frictional braking device to assist said auxiliary braking device when said calculation states that the auxiliary braking device is not able to alone obtain said braking action to be applied to the vehicle.

The invention relates to a method for setting and activating a hydrodynamic retarder (1) of a motor vehicle, in which method the retarder (1) has a regulable hydraulic circuit (15) and means for measuring the hydraulic pressure in the hydraulic circuit (15), and in which method at least one pre-setting takes place in order to generate a braking torque which follows a predefined brake moment characteristic curve which is permanently stored in a control and regulating unit (6) and by means of which the retarder (1) is activated in driving operation. In order to improve the setting accuracy of the braking torque of said retarder, it is provided that the hydraulic pressure in the hydraulic circuit (15) of the retarder (1) is taken into consideration at least during the pre-setting. Additionally provided is a device in which the retarder (1) has a regulable hydraulic circuit (15) with at least one pressure sensor (9), and in which the hydraulic circuit (15) is assigned a control and regulating unit (8) which has a non-volatile data memory and a processor unit in which current input data and stored data can be processed, and in which an output signal for activating an electric valve device (13) and/or an oil filling device of the retarder (1), by means of which a predetermined nominal braking torque (Msoll) can be set, can be generated from the processed data.

A bearing raceway ring (25) disposed near a mounting section (9) is disposed on the outer periphery of a circular cylinder section (19). A fluid-sealed chamber (40) in which a measurement liquid is hermetically enclosed is provided between a first member (8) and the bearing raceway ring (25) which is disposed near the mounting section (9). Pressure acting on the fluid to be measured changes as the bearing raceway ring (25) moves in the cylinder-axis direction, the bearing raceway ring (25) being disposed near the mounting section (9). The fluid-sealed chamber (40) is provided with a pressure sensor (44) capable of detecting a change in the pressure of the fluid to be measured.

The invention discloses a speed retarder of a proportional valve control pump type medium and low power vehicle, comprising a hydraulic pump driving gear, a hydraulic pump and a proportional overflow valve; wherein an inlet of the hydraulic pump is connected with an oil tank; a rotor of the hydraulic pump is mechanically connected with a hydraulic pump driving gear shaft; and the proportional overflow valve 7 is electrically connected with an ECU and connected with an outlet of the hydraulic pump and a heat exchanger by a hydraulic pipeline. The speed retarder has the beneficial effects that 1. the heat generated by energy loss can be taken away by the hydraulic oil while the vehicle is auxiliarily braked by the speed retarder; 2. the speed retarder is easy to be controlled by a computer so as to provide a stable and accurate braking torque; 3. wear is basically not generated and the service life is long; and 4. power source is not needed and the structure is simple.

A braking apparatus for a vehicle, in particular a heavy goods vehicle, includes a drive axle having a transmission gear, such as a differential, around which an amount of oil for lubrication is variable. The brake apparatus further includes at least one friction brake and at least one retarder that is capable of operating to slow the vehicle through the transmission gear. The braking apparatus comprises a brake operating device for operating the at least one friction brake and the least one retarder, and a determining feature to determine an oil level around the transmission gear. The brake operating device, on operation by a user, is arranged to apply the retarder when the oil level around the transmission gear is above a threshold level, and, if the oil level is below the threshold level, the brake operating device is arranged to initiate an increase in the oil level around the transmission gear.

The invention relates to a method for controlling the power transmission of a hydrodynamic retarder, comprising a circulating rotor having vanes and a stator having vanes or a counter-rotating rotor having vanes circulating in the opposite rotational direction to the rotor, which together form a working chamber that can be filled with operating medium by means of an inlet and that can be emptied by means of an outlet, wherein the working chamber is filled in a brake operation with operating medium and a brake torque is generated with the hydrodynamic retarder and, in a non-braking operation, the working chamber is emptied to a specific residual amount of operating medium and substantially no brake torque is generated with the hydrodynamic retarder.; The invention is characterised by the following step: In the non-braking operation, by means of an idling pump, operating medium is conveyed from an operating medium reserve, which is provided outside the working chamber in an operating medium reserve tank, into the working chamber of the hydrodynamic retarder for the adjustment of the residual amount.

The present invention relates to a hydrodynamic brake for a vehicle. A stator (10) and a rotor comprises each an annular recess (14) and a plurality of vanes (18) which are provided in the respective parts of the recess (14). The rotor is arranged to rotate in a direction of rotation such that a relatively high pressure is created on a first side of the respective vanes (18) of the stator (10) and a relatively low pressure of a second side of the respective vane (18) of the stator (10). This pressure difference is used for the supply and the discharge, respectively, of the fluid. The respective supply opening (26) is provided in the stator in the vicinity of said second side of a respective vane and the respective discharge opening (28) is provided in the stator in the vicinity of said second side of a respective vane.