90results about How to "Small control force" patented technology

The invention discloses an operating method for a tractor clutch operating device with hydraulic assistance. A booster cylinder is connected with a clutch pull rod through a clevis by a clutch pedal, an output pipeline of a steering constant flow pump of a tractor provides pressure for the booster cylinder, and a piston rod of the booster cylinder is connected with the clutch pull rod through the clevis. When a driver steps on the clutch pedal, firstly power is provided for a throttling valve in the piston rod to enable an upper cavity and a lower cavity in an assistance oil cylinder to generate a pressure difference, the piston rod is pushed to pull the clutch pull rod, the clutch is separated, the easy control of the clutch is achieved, the torque reserve coefficient of the clutch is increased, the operating force of the driver is reduced, and the operating comfort of the driver is improved.

The invention discloses a tail control force induced control pull-type cable remote control underwater vehicle which comprises torpedo type floating bodies, a fixed tilt wing type support, a fixed horizontal main wing, a fixed vertical tail wing, a controllable attack angle horizontal tail wing, a tail horizontal thrust water sprayer pipe system and a main cavity capable of realizing a pull course stabilization function, wherein the main cavity is of a vertical rudder shape, the two torpedo type floating bodies are arranged at two sides above a vertical symmetric surface of the main cavity of the underwater vehicle, the fixed horizontal main wing is connected with the two torpedo type floating bodies through a fixed shaft, two support short plates are arranged between the front part of the fixed horizontal main wing and the main cavity, the fixed tilt wing type support is used for connecting the torpedo type floating bodies with the upper part of the main cavity, and the controllable attack angle horizontal tail wing and the fixed vertical tail wing are arranged above the rear part of the main cavity. The tail control force induced control pull-type cable remote control underwater vehicle is flexible and reliable in control mechanism, better in pull course stability, strong in autonomous stabilizing capacity, high in bow steering, heaving, and swaying movement control efficiencies, and higher in business development value.

The invention provides a novel parafoil and a steering and control method thereof. The parafoil comprises upper wing surfaces, lower wing surfaces, a plurality of wing ribs, two groups of parafoil ropes, two groups of steering ropes, two groups of straphangers and two steering straps. A plurality of flow guide holes are formed on two sides of each upper wing surface symmetrically, a flow guide vane is arranged on the inner side of each upper wing surface and at the position corresponding to each flow guide hole, a plurality of steering rope holes and the steering ropes penetrating the steering rope holes are arranged on two sides of each lower wing surface symmetrically, each flow guide vane is arranged between each upper wing surface and the corresponding lower wing surface, and each flow defector is connected with the corresponding steering rope. The steering ropes are stretched to drive the flow guide vanes to fold and unfold so as to control opening and closing of the flow guide holes, and directional steering and flared landing steering are realized. The novel parafoil has the advantages that aerodynamic performance of the parafoil is changed through the structures of the flow guide vanes, the flow guide holes and the steering ropes, weight of an existing steering mechanism is reduced greatly, steering force is low, the directional steering and the flared landing steering are realized simultaneously, and control accuracy is high.

The invention relates to a novel lower chamber device. The lower part of the novel lower chamber device is provided with double crawler travel mechanisms. A frame is arranged between the double crawler travel mechanisms. The upper part of the frame is provided with a rotating platform. The rotating platform is provided with a cab. The rotating platform at the rear of the cab is assembly connected with the lower end of a telescopic suspension arm. The rotating platform is provided with a lifting mechanism. The lifting mechanism is matched with the telescopic suspension arm. The rotating platform is also provided with a telescopic counterweight mechanism. When the novel lower chamber device is used for operating under the cabin, two modes of complete counterweight extension and complete counterweight shrinkage can be realized, wherein the counterweight extends completely to improve the lifting performance; and the counterweight shrinks completely to improve conformability for the space.

The invention discloses a vehicle steering gear, which comprises a left tie rod, a right tie rod, a steering shaft, a cylindrical cam, a left push rod and a right push rod; the inner wall of the cylindrical cam is formed with a left cam rolling groove and a right cam rolling groove; one end of the left push rod has a left push rod convexity matching with the left cam rolling groove; one end of the right push rod has a right push rod convexity matching with the right cam rolling groove. Since cam mechanism can realization any motion locus curve, so the left cam rolling groove and the right cam rolling groove can be designed to cause the motion locus of the push rod mechanisms in both the grooves to meet Ackermann's curve; thereby, the invention avoids slide phenomenon of wheel when vehicle turns, reduces tire abrasion, prolongs the service life of tire, can realize the transmission ratio variation function of the steering gear easily, and enable the vehicle to achieve better control performance.

The invention relates to a brake system of a mechanical single-drum road roller, which comprises an air storage tank (1), a brake control valve (2), a brake (3), a pressure switch (4) and a changeover governor (5) with a lock, wherein, the brake (3) comprises a cylinder (3.1) and a spring (3.2); the spring (3.2) is sheathed on a piston rod of the cylinder (3.1); the air storage tank (1) is connected with the brake control valve (2) which is connected with a rodless cavity of the cylinder (3.1) of the brake (3); the rodless cavity of the cylinder (3.1) of the brake (3) is connected with the pressure switch (4) which controls the power supply of the changeover governor (5) with a lock; and the pressure switch adopts normally open type pressure switch. The brake system of the invention utilizes an air-break brake principle to connect a pressure switch on a brake control valve or a brake cylinder, and realizes parking brake protection through controlling the changeover governor with a lock by the pressure switch. Only the parking brake is loosed, can the gear be put into gear for driving. The brake system has small operation force and safety and reliability.

A valve device which comprises a valve housing having a plurality of shifting tongues and a valve slide that can move longitudinally in the valve housing. The valve slide is made with diameter sections which co-operate with the shifting tongues depending on an axial position of the valve slide. At least one of the diameter sections is made with at least one, at least approximately groove-like recess that extends in the circumferential direction of the valve slide. The groove-like recesses are functionally connected to an axial bore extending in the valve slide essentially in the axial direction, by way of at least one radial bore extending at least approximately in the radial direction in the valve slide.

The present invention discloses a linear motor assembly used for a stepping machine tool. The linear motor assembly is provided with a linear motor with two secondary units which are arranged on a supporting plate of a sliding support, and each secondary unit is equipped with a primary unit. The supporting plate is sandwiched between the primary units, and the sliding support guides and supports movably along a longitudinal direction via at least one linear guide device. The sliding support can apply an operating force on a cutter at the end side, wherein the operating force is basically vertical with a longitudinal axis to play part.

The invention relates to a multiway electro-hydraulic control valve adopting oil return differential pressure as a pilot oil source. The multiway electro-hydraulic control valve comprises an oil inflow valve group, an oil return pressure adjusting valve group, and multiple electro-hydraulic directional control valve groups arranged between the oil inflow valve group and the oil return pressure adjusting valve group. Common oil inflow channels, middle unloading channels and double-way oil return channels are arranged in valve bodies of the oil inflow valve group, the electro-hydraulic directional control valve groups and the oil return pressure adjusting valve group. The common oil inflow channels are communicated with the common oil return channels in parallel respectively. The middle unloading channels are of a series oil way structure. Pilot oil cylinders are arranged in end covers of the electro-hydraulic directional control valve groups. One end of a directional main valve element of each electro-hydraulic directional control valve group is connected with the corresponding pilot oil cylinder in a coaxially matched mode. Electromagnetic pilot valves are integrated on the electro-hydraulic directional control valve groups. Pilot pressure adjusting valves are arranged in the oil return channels of the oil return pressure adjusting valve group. 2-3 Mpa constant-value differential pressure is formed at the front ends and the rear ends of overflow ports of the pilot pressure adjusting valves. The safety guarantee requirements for remote control over hydraulic machines and safety guarantee for equipment or staff in an emergency can be met, and configuration of pipelines and the oil source is reduced.

The invention discloses an automobile steering device which comprises a let steering pull rod, a right steering pull rod, a steering device shell body, a steering input shaft, a pinion, a left handspike, a right handspike and a cam, wherein, the center of the cam is provided with a ring gear whose center is rotatablely connected with the steering device shell body, and the periphery of the ring gear is provided with a left cam slot and a right cam slot. One end of the left handspike is provided with a left pin roll inserted in the left cam slot, and the other end of the handspike is hinged with the left steering pull rod; and one end of the right handspike is provided with a pin roll inserted in the right cam slot, and the other end of the handspike is hinged with the right steering pull rod. The invention makes use of a cam mechanism to cause rotation angles of the left steering wheel and the right steering wheel meet the Ackermann curve in real time, each wheel of the steering device carries out pure rolling movement when an automobile steers, and the abnormal abrasion is reduced when tyres steer, thus enhancing the life of the tyres greatly. The variable transmission ratio is realized, and the operation stability and the security are enhanced.

The invention belongs to the filed of hydraulic pressure and relates to a hydraulic switch valve. The hydraulic switch valve comprises a switch valve core, a switch valve sleeve and a spring, wherein the switch valve sleeve is of a hollow structure; oil holes communicated with a left cavity and a right cavity of an action cylinder, and four servo control cavities and mechanical operation cavities, are formed in the side wall of the valve sleeve; the four servo control cavities and mechanical operation cavities are mutually separated at intervals; a control opening used for state switching and an oil return opening used for unloading are also formed in the switch valve sleeve; the switch valve core is arranged in the switch valve sleeve and has more than four convex shoulders; the width of the convex shoulders is more than the diameter of the oil holes; the distance between two convex shoulders corresponds to that between two oil holes in the side wall of the switch valve sleeve; and one end of the spring is sleeved on the end head of the switch valve core, and the other end of the spring props against the inner wall of the switch valve sleeve. The convex shoulders of the valve core are used for operating the control cavities to switch operation states of a hydraulic part and distribute flow, so switch interference is avoided, and the operation force is reduced, and the failure rate of the hydraulic part caused when the valve core is locked can be reduced.

The invention discloses a hydraulic brake valve of a feedback piston of a valve core. The hydraulic brake valve comprises a valve body, the valve core, a return spring, a balance spring and a push rod, wherein the valve body is provided with an input port, an output port, an oil return port and a valve core cavity, the input port, the output port and the oil return port are respectively communicated through the valve core cavity, the valve core is connected to the valve core cavity in a sliding manner, and the push rod is movably connected to the upper end of the valve core; a feedback passage is arranged in the valve core, and the feedback channel is communicated between the output port of the valve body and the bottom end of the valve core cavity; the hydraulic brake valve further comprises the feedback piston, wherein the upper part of the feedback piston is contained in the feedback passage, and the bottom end face of the feedback piston is in contact with the bottom surface of the valve core cavity. According to the invention, through redesigning the structure of the feedback passage and adding the feedback piston, the hydraulic brake valve has the characteristics of high flow, low control force, stable output pressure and controllable size.

The invention discloses a valve-controlled hydraulic transmission system applied to an exoskeleton robot. The valve-controlled hydraulic transmission system comprises a hydraulic oil source, a manualservo valve, an oil-filling one-way valve, an oil cylinder, a first mechanical arm and a second mechanical arm which is hinged to the first mechanical arm. The hydraulic oil source comprises a servo motor, a hydraulic pump and an oil tank; the servo motor drives the hydraulic pump; the hydraulic pump sucks oil from the oil tank to be supplied to the manual servo valve; the manual servo valve has mechanical position feedback to form closed-loop control; an oil outlet of the manual servo valve communicates with an oil inlet cavity of the oil cylinder and further communicates with the oil tank through the oil-filling one-way valve; and the manual servo valve comprises a reversing valve, a reversing control mechanism connected with the reversing valve, and a control mechanism travel limiting device. Under the joint cooperation effect of the manual servo valve, the oil-filling one-way valve and the oil cylinder, the control mode of the exoskeleton robot is simplified, the working reliability and safety are effectively improved, the working speed is increased while energy consumption is reduced, and the production and using cost is reduced.

The invention discloses a parking brake control mechanism, which comprises a brake handle, a stay cable assembly and a brake handle locking mechanism, wherein one end of the brake handle is rotatably connected with a toothed plate seat through a rotating shaft, and a fan-shaped toothed plate is arranged on the toothed plate seat; the stay cable assembly is linked with the brake handle and includes a pull rod and a stay cable wiring board, one end of the pull rod is connected with the stay cable wiring board, and the other end of the pull rod is connected with a rotating shaft component on the rotating shaft; and the brake handle locking mechanism includes the toothed plate seat, a push rod, a push rod seat, a return spring and a button, one end of the push rod is provided with a pawl, the other end of the push rod is arranged in an inner hole at the end of the brake handle to be connected with the buttonthrough the return spring and the push rod seat, and the pawl is unlocked from the fan-shaped toothed plate. The parking brake control mechanism has the advantages that the technical structure is simple, the push rod is used as a pawl unlocking transfer device, reliability is good, durability is high, transmission efficiency is high, the stay cable wiring board is arranged under the car body floor for easy arrangement and after sales maintenance, and the button can be plated with chrome, so that the parking brake control mechanism can be beautifully shaped, and can be popularized on a large scale.

The invention relates to a hydraulic pilot valve arrangement and a hydraulic valve arrangement having the same. The hydraulic pilot valve arrangement for pilot-controlling a valve includes at least one pilot valve configured to be activated electromagnetically in a pulse-width-modulated fashion. The pilot valve is configured to be activated ballistically or inversely ballistically. The hydraulic valve arrangement including the hydraulic pilot valve arrangement also has a valve configured to be pilot-controlled by the pilot valve arrangement.

The invention relates to a fuel injector for a fuel injection system, in particular a common rail injection system, having a nozzle body (1) and having an injector body (2), wherein in the nozzle body (1) there is formed a high-pressure bore (3) for accommodating a nozzle needle (4) which can perform a stroke movement and by means of the stroke movement of which at least one injection opening (5) can be opened up or closed off, and wherein in the injector body (2) there is formed a low-pressure chamber (6) for accommodating a piezoelectric actuator (7), which low-pressure chamber can be or is hydraulically coupled via a coupling device (8) to the nozzle needle (4) in such a way that the nozzle needle (3) assumes the closed position thereof when the piezoelectric actuator (7) is electrically discharged. According to the invention, the coupling device (8) comprises a first and a second disk-shaped coupler body (9, 10) with in each case one cylinder bore (11, 12) for accommodating in each case one coupler piston (15, 16) which delimits a coupler chamber (13, 14). The invention also relates to a method for the manufacture and/or assembly of a nozzle needle assembly for a fuel injector.