Hydraulic cylinder

FIELD: engines and pumps.

SUBSTANCE: hydraulic cylinder comprises a casing, a piston, a rod, lugs and seals, the casing and rod representing cylindroids. The casing, piston and rod cross-section edges are described by the expression x2/a2+y/b2=1, where a is the ellipse larger half-axis length, b is the ellipse smaller half-axis. The casing, piston and rod cross-section edges should meet the following condition, i.e. a/b=1.8...2.7.

EFFECT: higher bending resistance in the cylinder lengthwise plane and ruling out the piston rotation in the casing relative to lengthwise axis.

6 dwg

 

THE TECHNICAL FIELD TO WHICH THE INVENTION RELATES.

The invention relates to the field of lifting and transport machinery and hydraulics, cylinders, disposable automobile cranes, cranes-manipulators. The invention can be used for the manufacture of hydraulic cylinders for moving the retractable boom sections, cylinders extension of outriggers, hydraulic cylinders hanging, cylinders change boom crane or a jib crane.

THE LEVEL OF TECHNOLOGY.

There are a large number of analogues of the claimed invention, both domestic and foreign developments. Thus, similar to the cylinders described in EN 2219381, EN 2219382, EN 2219383 and other sources, can work under bending loads. However, they are not designed to transmit torque.

From among the known analogues of the proposed technical solution closest (prototype) can serve as a double-acting hydraulic cylinder for sections of the multiple boom truck crane KS-59711 (Manual KS-59711.00.000 OM). The specified cylinder includes a housing, a piston, rod, lugs, and seal.

The disadvantages of the cylinder are:

i. low resistance to bending.

ii. no transmission of torque applied to prose the am of the cylinder.

DISCLOSURE OF THE INVENTION.

The present invention is improving the strength characteristics of the cylinders.

In accordance with the invention this object is achieved in that the inventive hydraulic cylinder includes a housing, a piston, rod, lugs, seals and from the prototype differs in that the body is made in the form of direct elliptic cylinder, the piston is made in the form of direct elliptic cylinder and the rod is made in the form of direct elliptic cylinder and in cross section the boundaries of the body, the rod and piston are described by the equation: x2/a2+y2/in2=1,

where a is the length of the semimajor axis of the ellipse;

in the length of the minor axis of the ellipse,

and for the borders of the body, the rod and piston, the condition:

a/b=1.8 2.7....

Technical results are:

i. Increased resistance to bending in the longitudinal plane of the cylinder, passing through the large axis of the outer boundary of the cross-sections of the housing, piston and rod of the hydraulic cylinder.

ii. Preventing rotation of the piston in the housing about the longitudinal axis, which will provide a perception of the hydraulic torque applied to the eyes.

For the housing of the hydraulic cylinder, the semimajor axis of the ellipse is the size of the range from 0.5 m to 0.05 m, the Thickness of the body is the amount of from 0.002 m to 0.02 m

CU IS RIGID DESCRIPTION OF THE DRAWINGS.

The invention is illustrated by drawings Figure 1 is 6, which shows a longitudinal section of the inventive hydraulic cylinder, the cross section a-a cylinder, the cross section b-B holes for feeding the working fluid in the retraction of the rod section In the pair of bearing hinge 17 and the lugs 1, the extension element D, showing the sealing ring 21 and the clamping ring 22, the extension element E, showing the protective washer 19 and the cuff 20.

THE IMPLEMENTATION OF THE INVENTION.

The inventive hydraulic cylinder includes a housing 10, a piston 11, the piston rod 9, the lugs 1, rubber seals, 3, 7, 14, ring 2, the wiper 4, a nut 5 and 16, 19, the screw 15, the bearing of the hinge 17, the grease fitting 18, the cuff 20, the ring sealing profile, the clamping ring, the washer 23, the tube 24, the sleeve 25. Supply to the piston cavity marked "A"supply to the rod end marked "B". The housing 10 is made in the form of direct elliptic cylinder, the piston 11 is also made in the form of direct elliptic cylinder and the piston rod 9 is made in the form of direct elliptic cylinder.

On the section a-a introduced the following notation:

26 - the semimajor axis of the outer boundary of the cross-section of the body;

27 - the semimajor axis of the inner boundary of the cross-section of the casing and the outer boundary of the piston;

28 - the semimajor axis of the outer boundary of the cross-section of stock;

29 - big poluo the ü internal boundaries of the cross-section of the rod;

30 is the smaller radius of the inner boundary of the cross-section of stock;

31 - the smaller the radius of the outer boundary of the cross-section of stock;

32 - the smaller the radius of the inner boundary of the cross-section of the casing and the outer boundary of the piston;

33 - the smaller the radius of the outer boundary of the cross-section of the hull.

In the cross section of the inner and outer boundary of the housing, the claimed hydraulic cylinder is described by the equation:

x2/a2+y2/in2=1,

where a is the length of the semimajor axis of the outer boundary of the cross-section of the shell elliptical, has a value of 0.15 m;

in the length of the smaller axis of the outer boundary of the cross-section of the shell elliptical, has a value of 0.08 m, and for the border corps condition:

a/b=1.875.

In cross section the outer border of the piston (inner border of the cross-section of the hull claimed cylinder is described by the equation:

x2/a2+y2/in2=1,

where a is the length of the semimajor axis of the outer boundary of the cross-section of the piston elliptical, has a value of 0.14 m;

in the length of the smaller axis of the outer boundary of the cross-section of the piston elliptical, has a value of 0.07 m, and for the border of the piston is provided:

a/b=2.0.

Cylinder prototype does not perceive cu is shining moment applied to the eyes, and can perceive only compressive and Flexural loads.

For comparison of the prototype and claimed cylinder will accept that the area of the piston is the same.

The diameter of the piston cylinder of the prototype will be 0.2 m, the area of the piston is equal 0.0314 m2. The outer diameter of the cylinder of the prototype will be 0.22 m wall Thickness equal to 0.01 m

The moment resistance of the cross-section of the housing of the hydraulic cylinder prototype in bending about an axis "x" is determined by the formula:

Wx=π(D4-d4)32D,

where D is the outer diameter of the cylinder of the prototype;

d - inner diameter of the cylinder of the prototype (piston diameter).

Then

The maximum bending stress in the cross section of the housing of the hydraulic cylinder of the prototype is determined by the formula:

where Mtechnology- the value of the bending moment in the cross-section of the housing cylinder.

The outer surface of the shell announced cylinder ratio a/b equal to 1.875, namely a=0.15 m=0.08 m

The inner surface of the case stated hydrocylinder ratio a/b equal to 2.0. namely, a=0.14 m=0.07 m

The surface area of the piston claimed cylinder also equal 0.0314 m2.

The moment resistance of the cross brings the I corps claimed cylinder in bending is determined by the formula:

Wx=π(A3In-a3in)/4A

where a is the semimajor axis of the ellipse of the outer surface of the housing cylinder;

and the semiminor axis of the ellipse of the outer surface of the housing cylinder;

In - the semimajor axis of the ellipse of the inner surface of the housing cylinder;

in - the semiminor axis of the ellipse of the inner surface of the housing cylinder.

Then

Comparing the results of calculations by formula 1 and formula 2, we get that the moment resistance of the cross-section of the hull claimed cylinder in bending is 24% higher than the moment of resistance of a similar cross-section of the cylinder of the prototype.

The maximum bending stress in the cross section of the hull claimed cylinder (see formula 2) is 24% less than the maximum voltage in the same section of the cylinder of the prototype.

As mentioned previously, the claimed hydraulic works in torsion.

The moment resistance of the cross-section of the hull claimed cylinder when the torsion is determined by the formula:

WHK=π(AB2-AB2)/2.

For this example, WHK=0.00043 m3.

The maximum voltage torsional corps claimed cylinder is determined by the formula:

Tmax=Mto/WCC,

where Mto- torque.

At Tmax=7·108PA (Steel W tempered) allowable torque will be 301000 Nm.

The same effect is achieved by replacing the circular cross-section rods on the elliptical.

The claimed hydraulic cylinder, may be applied as a hydraulic cylinder extension section boom truck crane, can significantly simplify the design of the sections.

Presented in the claims range a/b=1.8 2.7...for the borders of the body, the rod and piston are selected from the condition of possibility of realization of production of JSC Avtokran. Currently JSC Avtokran, Nitrostyrene conduct comprehensive studies of the pistons where the outer surface of the shell cross-section condition: a/b=1.875. a/b=1.95 and a/b=1.80.

The claimed hydraulic cylinder can be used in automotive crane as gidropony, cylinder extension outriggers, hydraulic cylinder extending and retracting the boom or section of the jib. Extremely effectively may be the use of the cylinder as the cylinder changes the boom of the crane or crane.

Thus, the technical results of the invention are achieved. Provides increased resistance to bending. Prevents rotation of the piston in the housing about the longitudinal axis, both the Petit perception cylinder torque attached to the eyelets.

Cylinder, comprising a housing, a piston rod; eyes, seal, characterized in that the casing is made in the form of direct elliptic cylinder, the piston is made in the form of direct elliptic cylinder, and the rod is made in the form of direct elliptic cylinder, and the cross-sectional boundary of the housing, the rod and piston are described by the equation:

x2/a2+y2/in2=1,

where a is the length of the semimajor axis of the ellipse;

in the length of the minor axis of the ellipse,

and for the borders of the body, the rod and piston condition:

a/b=1,8 2,7....



 

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