DE2013253A1 - Piston pump - Google Patents

Description

Patent attorney Dipl. Ing. CWallach H. MRI «70

Dipl. Ing. G. Koch
Dr. T. Halbach
8 Munich 2
Kiufingbrstr. 8, Tel. 24027Ö 12 529 - Wg / St.

Frederick Arthur Summerlin, Harpenden, Hertf ./England Piston pump

The invention relates to a piston pump, wherein a The aim of the invention is to provide a pump that can be used in a hydraulic transmission system of those Design can be used, the subject of the patent,. (German patent application P 15 OO 497.4) is. It was determined, that it is important in this transmission system that the pump has low losses and high efficiency because when the pump is not supplying fluid to the load, the pump is operating at maximum pressure and essential fluid PS between the cylinders circulate.

According to the invention, a piston pump has one or more of the following features.

The piston (or cylinder) can be eccentric on the main shaft be arranged so that it effectively forms an integral formation with the connecting rod, whereby a Rotary connection is avoided. -

A pivotable cylinder (or piston) could be a swash plate drive to the piston (or cylinder) to be used.

The cylinder (or piston) can be in a ball joint be held, which allows tilting when driving the pump, so that significant lateral loads between the piston and the cylinder.

The cylinder (or piston) can be arranged in a bore whose cross-sectional area is equal to the cross-sectional area of the cylinder is so that the cylinder during the Does not absorb any hydraulic axial forces during operation.

One or more of these features make a significant difference Reduction of the pump losses, so that these with a higher WIrkuigsgrafi works and still easier to build iat. ■ As a rule, all burdens are released rotating surfaces and all bearings are ball bearings or hydro3tatiache bearings.

The invention can be put into practice in various ways. In the following, an example is described with reference to the drawing; in the drawing shows ι

1 shows a schematic cross section of a cylinder

a three-cylinder pump designed according to the invention;

Fig. 2 is a partially sectioned view of the pump Direction of arrow II in Fig. 1j

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Fig. 3 shows a top view of a valve member of the pump.

St? The piston 3 is fastened by a hydrostatic connecting rod bearing 4 on an eccentric arm of the main crankshaft 1 so that the piston 3 and the connecting rod essentially form a one-piece member 3, the connecting rod bearing being carried by the piston. The main bearing 1 is supported in ball bearings 2.

The cylinder 5 is designed at the outer end with an inner ball connecting member 6, the outer load being universally pivotable in a ball housing 5 of an upper bore 7 so that the cylinder can tilt when the piston moves back and forth , whereby lateral loads between the dsm piston 3 and the cylinder 5 are avoided. The cylinder leads directly into the bore 7 ₈ has the same diameter as the cylinder 5, so that no hydraulic axial forces are applied to the cylinder during operation.

Bore 7 i * id ball link 6 are through a sealing ring 8 made of a low friction material such as Nylon, or acetal loaded with molybdenum sulphide, sealed, the ring θ is in a tight fit in the body of the pump head 15> »Neck lengths 9 and 10 hold the ring 8 and the ball member 6 fixed; however, the ring 9 must be in the V 4se work that it does not prevent the oil pressure on the (> the first side of the ball joint acts what a hydraulic A. initial force on the cylinder.

The hydrostatic cylindrical journal bearing is lubricated through a small bore 11 at the inner end of the

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Piston using the work EB ^ rcmungarsittela. This Bearing has a small axial play, so that the piston can always be axially aligned with the cylinder and all other misdirections between hole 7 and the axis of the crankshaft are taken up by the ball connection 6.

The head 15 has automatic inlet and outlet valves 12 and 13 'each of which is supported by a flexible disc 17 that with had. 18 work together, each of which has a ring of openings (not shown). Any of these Disc has a ring part 19 »including the openings to be marked» this part through with a central door part curved a flexibility causing spokes 21 connected let * The discs 17 are fastened in the middle by bolts 22 to the plates 1Θ. Am ring with 1/8 inch openings (.3, 175 mm) diameter worked up to DrUoken from about 600 pounds per square should (4i22 kg / mm) satisfactory.

In the transmission system gon & ß Patent ·. «(Douteohe patent application P 15 OO 497.4} and also in the patent ... (German Patent application P 19 57 105.2) had a connection from Pump output to an accumulator or a shunt current upwards compared to the tentiles - eu this For this purpose, the bore 7 can be connected directly to the accumulator or the shunt.

In the patent ... (German. Patent application P 19 57 105.2) is a three phase arrangement is shown using a three phase shunt and for this application the same three as shown in Fig. 2 would be arranged axially along the main shaft and at top dead center with shaft angles of 120 ° from each other

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BATHROOM OBlGlNAL

^{v 7} JH) 13253

remote piston and cylinder assemblies their three holes 7 in connection with the three arms of the three-phase shunt

Ee it may be necessary to have the crankcase from assemblable Φβϋβη builds to the assembly to facilitate the connecting rod bearings for the crankshaft.

Alternatively, the pistons could also be arranged radially around the main shaft.

It should be noted that the side forces between piston and cylinder are here essentially eliminated, and that attack all loads on rotating surfaces, whereby furthermore, the piston is continuously driven by the crankshaft. This way the mechanical Losses are reduced and high speeds, for example up to 6000 revolutions per minute, are possible.

■ Patent claims s

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Claims (9)

Claims ι Piston pump, marked Through a cylinder brown that through, two susanmenpaseende Parts (5, 5) is formed, one of which is in such a way. Let a drive arranged that a relative back and forth Moving movement between the ropes is produced while the other part attached to a universal joint let. 2. Pump according to claim 1 »thereby g β k β η η - but that the universal joint is a ball joint (6) 3. Pump according to claim 2, characterized in that the cylinder space "it has a discharge" channel via the ball (6) la connection. 4. Punp # according to claim 3 _t d * 4ttrph gek β η η aeionnet, dal the QueysehnltteflUohe of the canal is equal to that of the cylinder roughness. 5 · Point according to claim 3 or 4 »thereby g e i- know that a cylinder member (· 5) the Ball carries, which is located in a bearing in the outlet channel 009840 / US4 finds, where the hydraulic pressure ία 3ylInder none
Axial force evokes each ball and channel. 6 · Pump according to one of the preceding daduroh g e k e η n £ e i ο h η e t that an inlet valve or one discharge valve or both valves are provided are »where each is in the form of a flexible plate. Let »dl · in the unbent state form a ventilating fining covers 7 «'Puape ns oh one of the g'eke.nneeioanet duroh one
• Red outlet and iron the valve-controlled
bridging outlet
or elnea AkkuBUlator. 8 «'ifebjrsylinderp-ajKpki äadureh gek β η ε β ei ο h. net «that each cylinder corresponds to one or more of the previous A & eprttoke is trained. 9. Doll naoh sit & s » ύ · ν Toroergoing Ansprttebi, by gekiniii ^ iobEit # dal the © gate of each of the Oil leather (5) essentriaeti fi ^ f a drive shaft of the Punp " is arranged Blank page