44results about "Hydrostatic brakes" patented technology

The control system comprises a control unit, an oil tank, an oil pump, a heat exchanger, a two-position three-way slide valve, a two-position three-way proportional pressure control slide valve, a switch electromagnetic valve, a proportional electromagnetic valve, a proportional valve and an air source, the air source is respectively connected with the switch electromagnetic valve and the proportional electromagnetic valve, an air outlet of the switch electromagnetic valve is respectively connected with the two-position three-way slide valve and the two-position three-way proportional pressure control slide valve, and an air outlet of the proportional electromagnetic valve is connected with the proportional valve. During working, under the control of the two-position three-way slide valve and the two-position three-way proportional pressure control slide valve, engine oil can quickly enter the brake cavity to quickly generate brake torque, and the proportional electromagnetic valve can control the opening degree of the proportional valve to adjust the flow of the brake engine oil in the brake cavity so as to adjust the brake force. Therefore, the speed changing box has the advantages that the effect taking time of the brake oil cavity is prolonged, engine oil emulsification is prevented, the liquid filling rate is accurately controlled, oil pumping and oil leakage of the speed changing box are prevented, and air loss is reduced.

The present invention relates to the field of mechanical transmission technology, and particularly relates to a multi-stage retardation device. The multi-stage retardation device includes: a sealing assembly, a stator, a rotor assembly, and a medium adjustment assembly; there is liquid in the sealing assembly, the stator and the rotor assembly are combined into a positive displacement pump, a throttle orifice is provided at the liquid outlet of the positive displacement pump, and the medium adjustment assembly changes the throttling damping effect of the throttle orifice by adjusting the viscosity of the medium. The rotor assembly is connected to an external component to be retarded, and the external component to be retarded drives the rotor assembly to rotate, generating high pressure at the liquid outlet, and generating resistance under the throttling effect of the throttle orifice. The mechanical energy of the rotor assembly is converted into the pressure potential energy of the liquid and then into heat energy to generate braking force. The multi-stage retardation assembly provided by the present invention uses the mechanical energy of the component to be retarded itself for energy conversion to achieve retardation braking, and has remarkable energy-saving effects.

This invention discloses a hydraulic retarder for reducing no-load losses, comprising: a stator, a rotor, and hydraulic fluid disposed inside a housing; a rotor shaft fixedly connected to the rotor; a high-gear and a low-gear on the rotor shaft, both loosely fitted on the rotor shaft; a low-gear and a high-gear on the output shaft fixedly fitted on the gearbox output shaft, respectively meshing with the low-gear and high-gear on the rotor shaft; a sliding sleeve axially movable, fitted on the rotor shaft, selectively meshing with either the high-gear or low-gear on the rotor shaft; a shift fork connected to the sliding sleeve for driving its movement; a cylinder including a first piston and a second piston, forming multiple working cylinders; an air source selectively connected to the multiple working cylinders; and the piston rod of the first piston selectively contacting the second piston, the piston rod of the second piston being connected to the shift fork. This invention features reduced no-load losses and increased braking power.

The invention relates to a method (40) for braking a compaction machine (1) operated by means of an electric motor (4). Furthermore, the invention relates to a compaction machine (1), in particular a tandem roller, roller compactor or refuse compactor, for carrying out the method (40).

The present invention belongs to automobile equipment in the transportation industry, and particularly relates to a hydraulic retarder with controllable internal pressure in the oil tank. A pressure sensor is connected to the oil tank, and a water temperature sensor is connected to the cooling water outlet pipe of the heat exchanger. The oil layer in the heat exchanger is connected to the oil tank through an oil inlet pipe, and the oil layer is connected to the rotor through a bypass oil return pipe. The oil inlet of the stator is connected to the oil tank through an oil inlet pipe 1, and the oil outlet of the stator is connected to the throttle valve and a one-way valve in series through an oil inlet pipe 2, and finally connected to the bypass oil return pipe to the oil layer of the heat exchanger. The lubricating oil pump is connected to the bottom of the oil tank through a lubricating oil pump suction pipe. The structure of a stepper motor and a proportional valve is used to replace the electromagnetic air proportional valve, and the proportional valve is driven by a stepper motor to provide the required compressed air for the hydraulic retarder, and then the pressure sensor feedbacks the signal to the ECU controller, so that the braking torque generated by the hydraulic retarder is more stable, with fewer failures, and the control is simpler and more accurate.

The present invention provides a Roots-type magnetorheological fluid medium high-pressure retarder and a car, and relates to the technical field of retarders. The Roots-type magnetorheological fluid medium high-pressure retarder comprises a working housing, a Roots-type transmission assembly, and a magnetic field generating component capable of generating a magnetic field and adjusting the magnetic field strength; a working cavity for the movement of the Roots-type transmission assembly is arranged in the working housing, an oil inlet and an oil outlet connected to the working cavity are provided on the working housing, an oil inlet pipe is connected to the working housing at the oil inlet, and an oil outlet pipe is connected to the working housing at the oil outlet; the working cavity is filled with magnetorheological fluid working medium, and a magnetic field generating component is arranged in the oil inlet pipe and / or the oil outlet pipe. The car comprises a car body and a Roots-type magnetorheological fluid medium high-pressure retarder; the Roots-type magnetorheological fluid medium high-pressure retarder is arranged on the car body, and the Roots-type magnetorheological fluid medium high-pressure retarder is connected to the car drive shaft through a speed reduction and torque increase gear pair. The technical effect of fast retarder response and large braking force is achieved.

A power machine (200) can include a traction lock system to stop movement of the power machine. The traction lock system can include a controller (310) configured to receive a brake input from an operator. In response to receiving the brake input, the controller (310) can temporarily command a target (e.g., reduced) speed of the engine (220) before engaging the brake (300).

Carriage (1) with a brake module (6) for a gravity overhead conveyor, characterized in that the brake module (14) comprises several fluid cylinders (15), one end of which is connected to a carriage (1) and the other end of which is eccentrically connected to an axis (4, 5) of the carriage (1), wherein the fluid cylinders (15) are indirectly eccentrically connected to the axis (4) at different mounting points (16, 17) and the mounting points (16, 17) are arranged on different running wheels (3) assigned to an axis (4, 5).

The present invention provides a commercial vehicle hydraulic pump retarder, which mainly solves the technical problems of the existing retarder, such as large weight and volume, small continuous power, starting lag and poor braking effect at low speed. The retarder includes a pump, and the first inner cavity and the second inner cavity with single-end outlets are respectively provided at both ends of the pump axis. The pressure regulating valve extends into the first inner cavity and is connected to the pump, which is used to adjust the pressure of the liquid in the pump; the clutch device extends into the second inner cavity and is connected to the pump, which is used to realize power transmission; the pump includes a pump housing, a main rotor and N auxiliary rotors located on the outer periphery of the main rotor; the pump housing is provided with N liquid inlet channels; the main rotor is provided with N blades, and the N blades divide the cavity between the main rotor, the auxiliary rotor and the pump housing into N pump chambers, and the first liquid outlet holes are respectively provided between the first inner cavity and the N pump chambers; the pressure regulating valve is provided with a liquid outlet channel; the liquid inlet channel, the pump chamber, the first liquid outlet hole, the first inner cavity and the liquid outlet channel constitute a liquid channel.

Emergency brake method and system method of exerting an emergency braking action in order to slow and / or stop a hydrostatic drive (HY) vehicle (VEH) during a service brake (SB) failure condition, where the brake service includes friction elements arranged to brake the vehicle (VEH) in response to a brake request; the method including, in the event of a service brake failure, a first step of automatically activating a SAHR spring parking brake system (SAHR), a second step to automatically activate hydrostatic braking, to exert said braking action, to complement said service brake system, by carrying out said emergency braking, and wherein said first and second steps are performed automatically and simultaneously in response to said braking request.

The application provides a pump type hydraulic resistance retarder, which mainly solves the technical problems of the existing retarder, such as large weight and volume, small continuous power, starting lag and poor braking effect at low speed. The retarder comprises a pump and a pressure regulating device, the pump comprises a pump shell, a main rotor and N auxiliary rotors located at the outer periphery of the main rotor; the pump shell is provided with N liquid inlet channels; the main rotor is provided with N blades, the N blades divide the cavity between the main rotor, the auxiliary rotors and the pump shell into N pump cavities, an inner cavity with a single-end outlet is axially arranged in the main rotor, and a first liquid outlet hole is arranged between the inner cavity and the N pump cavities; the inner cavity is connected with the pressure regulating device; the pressure regulating device is provided with a liquid outlet channel; and the liquid inlet channel, the pump cavity, the first liquid outlet hole, the inner cavity and the liquid outlet channel form a liquid channel. The pressure regulating device can be embedded or connected externally, so that the application range is wider.

The present invention relates to the technical field of vehicles, and particularly to a retarder non-driving axle and a vehicle. The non-driving axle provided by the present invention includes: a working chamber, a screw rod, and an oil storage chamber. Among them, the working chamber is a sealed chamber located within the non-driving axle housing, and is provided with a closable oil inlet and an oil outlet; the screw rod is located within the working chamber, is connected in series to the inner end of the wheel input shaft, and meshes with the stator within the working chamber to form a screw pump structure; the oil storage chamber is located within the non-driving axle housing, is externally connected to an oil inlet passage and an oil outlet passage, and is connected to the oil inlet through the oil inlet passage and to the oil outlet through the oil outlet passage, so that a circulating oil path is formed between the oil storage chamber and the working chamber. Since large vehicles or trailers have a large number of non-driving axles and require a relatively low retardation power, through the oil path arrangement built into the non-driving axle housing, a high-viscosity oil-assisted retardation structure is formed, which is compact, saves a large amount of space, and effectively reduces costs.

At least some embodiments of the present disclosure are directed to distributed pump architectures used in control systems for multifunctional machines. In some cases, a control system for a multifunctional machine includes three or more control circuits. At least two of the control circuits each has a hydraulic fluid pump and each of the pumps is controlled by a different control circuit. At least two of the hydraulic fluid pump have different flow rates.

A hydraulic / mechanical braking system for a vehicle comprises a cam (128) keyed onto a transmission shaft or a trailing wheel and at least two hydraulic cylinder assemblies (126,129) including a cam follower (127). A hydraulic circuit (C) connects the hydraulic cylinder assemblies together. A master brake valve (113) controls the flow of fluid in the circuit. Actuation of the master brake valve (113) obstructs the flow of fluid and hence the reciprocation of the hydraulic cylinder assemblies, forcing the cam following against the cam to resist rotation.

The invention relates to a method for controlling an engine brake of an internal combustion engine of a drive train of a motor vehicle (10). In one step, an engine brake is activated (40). In a further step, a commutation process is detected (42). Furthermore, in one step, a point in time of deactivation of the engine brake is determined (44) as a function of the identified commutation process. In a further step, the engine brake is deactivated (46) at a deactivation time. The invention also relates to a control device (12).

The invention relates to a brake system (100) for braking a rotation shaft (1), characterised in that it comprises: - at least one piston (4), actuated by means of an electric linear actuator (3), able to move between a retracted release position and a final extended braking position; - a casing (6) adapted to rotate integrally with the rotation shaft, with a cavity closed by a perpendicular cover (5), provided with at least one opening in which the piston (4) is fitted, and the piston (4) having the ability to move forwards into the closed cavity and move backwards, and - a filling occupying the closed cavity, rotating with the casing, consisting of a dispersion (7) or amalgam formed by a powdery or granular product with a lubricating agent.

The utility model discloses a control system of a hydraulic retarder, which comprises a control unit, an oil tank, a variable oil pump, a heat exchanger, a first two-position three-way slide valve, a second two-position three-way slide valve, a switch electromagnetic valve and a proportional electromagnetic valve, the variable oil pump, the heat exchanger, the first two-position three-way slide valve and the hydraulic retarder brake cavity are sequentially connected to form an oil inlet branch; the hydraulic retarder brake cavity, the second two-position three-way slide valve, the variable oil pump and the heat exchanger are sequentially connected to form an oil outlet branch; a control oil liquid outlet of the variable oil pump is connected with the switch electromagnetic valve, and the switch electromagnetic valve is connected with the first two-position three-way sliding valve and the second two-position three-way sliding valve. The proportional electromagnetic valve adjusts the flow of brake oil in the brake cavity by controlling the oil flow of the oil outlet of the variable oil pump so as to adjust the braking force. Therefore, the speed changing box has the advantages that the acting time of the brake cavity is prolonged, engine oil emulsification is prevented, the liquid filling rate is accurately controlled, oil pumping and oil leakage of the speed changing box are prevented, and air loss is reduced.

A method of automatically activating a high-torque braking system in a heavy-duty vehicle configured to operate in at least one low speed, high torque mode and at least one higher speed, lower torque mode is disclosed. The method comprising determining a speed-controller of the vehicle is in a first position which results in the vehicle travelling in a higher-speed, lower-torque mode, and, responsive to detecting braking and a change in position of the speed-controller from the first position to a second, neutral, position, activating a low-speed high torque mode of operation for braking the vehicle.

The invention relates to a hydrostatic vehicle intelligent trailer system and a control method, the hydrostatic vehicle intelligent trailer system comprises at least two groups of closed high-pressure loops, and each group of closed high-pressure loops comprises a walking pump, a walking motor and a hydraulic control reversing valve; the hydraulic control reversing valves of the two closed high-pressure loops are connected through a pipeline, a stop valve and a trailer valve are arranged on the pipeline, the other end of the stop valve is connected with a brake clutch through a pipeline, the brake clutch is connected with an oil supplementing mechanism through a pipeline, and a manual pump, an automatic pump and a trailer reversing valve are integrated in the trailer valve. According to the trailer environment and the trailer distance, a manual mode or an automatic mode can be autonomously adopted to relieve the braking resistance of the hydrostatic walking system, in the trailer process, the system has a braking low-pressure early warning function, the rotating speed of a motor can be automatically adjusted, internal leakage of a control valve and a clutch can be compensated according to the braking pressure requirement, and smooth trailer operation is guaranteed; the brake is prevented from being damaged.

A method for changing the direction of travel of a truck-mounted forklift by an operator located in the truck-mounted forklift, comprising the following method steps: - forwarding a command from the operator to change the direction of travel to a control unit (2), - in the event that the instantaneous speed of the truck-mounted forklift exceeds a predetermined value, reducing the speed below a predetermined limit by the control unit (2) according to a predetermined relationship and subsequently changing the direction of travel by the control unit (2), and preferably accelerating to a predetermined speed according to a predetermined relationship, and - in the event that the instantaneous speed of the truck-mounted forklift does not exceed a predetermined value, immediately changing the direction of travel by the control unit (2), and preferably accelerating to a predetermined speed according to a predetermined relationship.

At least some embodiments of the present disclosure relate to a distributed pump architecture for use in a control system for a multi-function machine. In some cases, the control system for the multi-function machine includes three or more control circuits. At least two of the control circuits each include a hydraulic fluid pump, each pump being controlled by a different control circuit. At least two of the hydraulic fluid pumps have different flow rates.

The present invention belongs to automobile equipment in the transportation industry, and particularly relates to a constant speed deceleration controllable hydraulic retarder. The control unit of the hydraulic retarder is composed of a servo motor, a water temperature sensor, an oil temperature sensor, a pressure sensor, and an electromagnetic reversing valve connected to an ECU controller through a wiring harness to transmit signals. The water temperature sensor is installed on the outlet pipe of the heat exchanger, the electromagnetic reversing valve is installed on the oil inlet pipe, the stator oil inlet is connected to the electromagnetic reversing valve through the oil inlet pipe, the rotor and the lubricating oil pump are coaxially connected through a transmission shaft, the stator is connected to one end of the throttle valve through the oil outlet pipe, a cooling water inlet pipe and a cooling water outlet pipe are provided on one side of the heat exchanger, and one end of the water temperature sensor is connected to the cooling water outlet pipe. According to the driving state of the vehicle, the ECU controller can accurately monitor the feedback signals of the pressure sensor, the water temperature sensor, and the oil temperature sensor, so that the control of the hydraulic retarder can be intelligent and accurate, and the control is more accurate.

Provided is a brake valve group for a hydrostatic transmission system of a railway engineering machinery vehicle, belonging to the technical field of brake valves. The brake valve group is composed of a valve body, a proportional relief valve, four electromagnetic reversing valves, two one-way valves and four pressure sensors. When the vehicle is in emergency braking, the vehicle can be quickly braked, and the reverse torque applied to the engine can be infinitely reduced when going downhill to achieve an auxiliary braking function. The brake valve group not only protects the engine and running hydraulic circuit components from damage, so that the running function of the vehicle can operate normally and the safety of the vehicle is ensured, but also the hydraulic running valve group has small braking energy loss and higher safety performance.

A power machine (200) can include a traction lock system to stop movement of the power machine. The traction lock system can include a controller (310) configured to receive a brake input from an operator. In response to receiving the brake input, the controller (310) can temporarily command a target (e.g., reduced) speed of an engine (220) before engaging the brake (300).

The invention relates to a method for controlling a motor brake of an internal combustion engine of a powertrain of a motor vehicle (10). In one step, the motor brake (40) is activated. In another step, a reversing process (42) is detected. A step is then carried out in which a deactivation time of the motor brake is determined on the basis of the detected reversing process (44), and in another step, the motor brake is deactivated at the deactivation time (46). The invention additionally relates to a controller (12).