Oleo Hydraulics And Pneumatics

Hydraulic Pump

Hydraulic steering unit arrangement, in particular for boats

Hydraulic steering unit arrangement, comprising a first hydraulic pump connected to a steering wheel, a piston cylinder device hydraulically coupled to the first hydraulic pump and arranged for connection to a steering mechanism, a second hydraulic pump and a second piston cylinder device hydraulically coupled via a servo valve to the second hydraulic pump.

The second piston cylinder device is connected to the steering mechanism. The servo valve has an actuating element which is affected by the first piston cylinder device to activate the second piston cylinder device, and which comprises a tubular element limitedly displaceable relative to the servo valve housing. A guide is axially displaceably mounted in the tubular element and is joined to the piston cylinder devices. The guide is provided, at a portion extending out of the tubular element, with a stop which can be fixed at different axial positions on the extending portion to limit the maximum extent of stroke of the piston cylinder devices in one direction.

In a known steering arrangement of this type especially designed for boats, the piston rod of the first hydraulic cylinder is displaceably mounted in the tubular actuating element of the servo valve, while its cylinder has one end fixed to one end of the actuating element. The distal end of the piston rod together with the piston rod of the other piston cylinder device is connected to a steering arm on a rudder shaft or a steerable outboard drive unit. In such a steering device, the maximum piston rod extension is determined by the length of stroke of the piston in the first cylinder and in order to adapt the maximum extension of the piston rod to the required maximum deflection of the steering arm, a stop sleeve at the distal end of the cylinder is used or alternatively axially spaced mounting holes in the distal end of the piston rod. By means of the stop sleeve or the choice of mounting holes, the length of travel can be varied in steps and in this manner be adapted to the steering arm pivot movement required for the installation in question.

The purpose of the present invention is to provide a steering arrangement of the type described by way of introduction in which the maximum steering arm swing can be simply varied with the steering arrangement mounted in place to thus make it possible for the customer to make the required adjustment. Said arrangement can also be made more compact and less bulky athwartships.

This is achieved according to the invention by virtue of the fact that a guide means is axially displaceably mounted in the tubular element and is joined to the piston cylinder devices and that the guide means is provided, at a portion extending out of the tubular element, with a stop which can be fixed at different axial positions on the extending portion to limit the maximum extent of stroke of the piston cylinder devices in one direction.

The stop can be formed of a nut on a threaded portion of the guide rod, which makes possible, in a simple manner, continuous adjustment of the maximum extension of the piston rod. The arrangement makes possible placement of piston cylinder devices side by side, which reduces the total length of the steering arrangement and thus the space requirement athwartships.

In addition to being able to limit the steering deflection in a simple manner by means of the described arrangement, there is provided a more compact configuration of the steering arrangement as compared to the conventional arrangement, in which the piston rod 6 on the cylinder 11 would extend through the valve tube 14, since this would mean that the righthand end of the cylinder 11 must be fixed to the lefthand end of the valve tube.

The present invention relates to a hydraulic steering unit arrangement comprising a first hydraulic pump connected to a steering wheel, a piston cylinder device hydraulically coupled to the first hydraulic pump and arranged for connection to a steering mechanism, a second hydraulic pump and a second piston cylinder device hydraulically coupled via a servo valve to the second hydraulic pump, said second piston cylinder device being arranged to be connected to the steering mechanism, said servo valve having an actuating element which is affected by the first piston cylinder device to activate the second piston cylinder device and which comprises a tubular element limitedly displaceable relative to the servo valve housing.

About the Author

Zhongyi Hydraulic Motor Company is a professional engaged in radial piston motor,axial piston motor,slewing transmission,danfoss motor,hydraulic orbital motor,hydraulic steering unit. All products are strictly tested before delivery by testing bench and comprehensive testing facilities to ensure the quality.

Air/Hydraulic Foot Pump $498.95 With shop air as the energy source, this pump has the power and oil capacity (80 cu. in. usable oil) to drive even the large 55-ton rams. It is an ideal all-around power source for dozens of body, frame, and alignment applications. It can be used with a variety of rams, presses, and hydraulic pullers operating at up to 10,000 PSI. An internal relief valve protects the hydraulic components regardless of hydraulic pressure. In addition, a two-stage release mechanism gives fast or metered ram return while reducing hydraulic shock. These pumps require 9 c.f.m. at 100 PSI air pressure at the pump. Develops 10,000 PSI at 100 PSI air pressure. 3/8'' NPTF oil port. 98 cu. in. usable oil capacity in plastic reservoir. Wt., 15 lbs., 3 oz.

OTC Stinger Air/Hydraulic Pump $304.95 ? Pump operates on shop air (40-100 PSI/ 9 scfm con-sumption), driving a variety of sgl. acting rams, presses, and hydraulic pullers operating at up to 10,000 PSI? Internal relief valve protects the hydraulic components regardless of hydraulic pressure? Two-stage release mechanism gives fast or metered ram return while reducing hydraulic shock? Pump, hold or release load with foot lever control? Reservoir capacity is 105 cu. in. (98 cu. in. usable)

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Xa11 - Hydraulic Pump $929.17 [277-XA-11] Truck Delivery

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Porto-Power Air/Hydraulic Foot Pump - 10 Ton $546.95 ? Includes hydraulic hose, mounting base plate ? 10,000 PSIBy Blackhawk Automotive.

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OTC Air/ Hydraulic Pump. Each $472.34 Manufacturer: OTC. Each. Features Benefits: With shop air as the energy source, these pumps have the power and oil capacity (80 cu. in. usable oil) to drive even the large 55-ton rams. They are ideal all-around power sources for dozens of body, frame,

Pa-133 - 10000 Air Hydraulic Pump $801.71 [277-PA-133] UPC: 66200510000 12 LB

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Strut Spring Compressor - Hydraulic $610.95 ? Smooth long stroke 4-ton ram with remote hydraulic pump provides effortless, safe, one man operation ? Angle rotatable spring clasp bracket adjusts to fit most strut spring makes and models ? Adjustable strut shaft clasp secures the strut during operation ? Sliding ram bracket provides multiple height adjustment ? Can be permenantly mounted to concrete wall or floorBy Omega.

Jack Hydraulic Clutch System $279.99 Magura Jack Hydraulic Clutch System Eliminates cables which fray and collect dirt and rust Self adjusting; delivers consistent pull - no more "adjust-on-the-fly" Doesn't fade throughout moto Smooth and gentle pull offers better control of power and reduces arm pump No more fading pressure point Up to 20% reduction of lever pull Forged lever blade with reach adjust is ready to mount Filled with biodegradable mineral oil Used by Andrew Short, Grant Langston, Jeremy McGrath and many more

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Black Bull Hydraulic 8-ton Bottle Jack $65.5 Floor jack boasts a solid cast iron base for maximum stabilityHydraulic bottle jack contains an adjustable extension screw capJack uses a replaceable pump cartridgeCleated, non-slip screw capHydraulic bypass prevents ram over-travel

JET 456620 AHJ-20, 20-Ton AHJ Series Air/Hydraulic Bottle Jack $209.99 20-Ton AHJ Series Air/Hydraulic Bottle Jack - 456620. Carrying Handle. Pump Handle. Heavy-Duty Molded Case

JET 456612 AHJ-12, 12-Ton AHJ Series Air/Hydraulic Bottle Jack $169.99 12-Ton AHJ Series Air/Hydraulic Bottle Jack - 456612. Carrying Handle. Pump Handle. Heavy-Duty Molded Case