The rotation mechanism of the excavator

 

(57) Abstract:

The invention relates to earth-moving machines, namely excavators. The rotation mechanism of the excavator contains the hydraulic motor, the shaft of which is connected to the shaft-gear reducer through an elastic coupling, consisting of slave and master hub and the brake disc type. The rotation mechanism is further provided with a hydraulic damper, comprising a housing with radial partitions and shaft with blades placed on the slave coupling flexible coupling with a gap between the blades and the inner surface of the housing, the gap is defined by the following ratio:

< / BR>
where b is the width of the blades; W=W- dynamic viscosity of the liquid;W- kinematic viscosity of the fluid; is the density of the working fluid; Z - number of blades; l is the length of the slit; D and D is the inner diameter and the shaft diameter;DFT- the angular velocity of the shaft; MDFT- braking torque damper. Increases the reliability of the rotation mechanism of the excavator. 2 Il.

The invention relates to earth-moving machines, namely excavators.

The mechanism of rotation of the platform (and.with. The USSR 1678990 A1, IPC E 02 F 9/12, 1991), which includes the engine, koblavi protrusion to mate with the bore of the platform, output gear, which engages with a ring gear.

The disadvantage of this device is the presence of high peak load at the time of start and stop of rotation of the turntable.

Known for turning mechanism (Excavator shovel universal EA-A. Technical description. The instruction manual. - Carpets, 1978, page 61, Fig. 19, 59), which includes a hydraulic motor, an elastic coupling comprising coupling sleeve and rubber pieces, three-stage gearbox and brake.

The disadvantage of this device is the frequent breakage of the gear teeth, occurring under the influence of peak load at the time of acceleration/deceleration of the turntable.

The objective of the invention is to improve the reliability of the rotation mechanism of the excavator by reducing peak load at the time of acceleration/deceleration of the platform.

This task is solved in that the rotation mechanism of the excavator, containing the hydraulic motor, the shaft of which is connected to the shaft-gear reducer through an elastic coupling, consisting of slave and master hub and the brake disc type, according to the invention is further provided with a hydraulic damper, comprising a housing with a radial the inner surface of the housing, the size of the gap is determined by the following ratio:

< / BR>
where b is the width of the blades;

W=W- dynamic viscosity of the liquid;

W- kinematic viscosity;

- the density of working fluid;

Z - number of blades;

l is the length of the slit;

D and D is the inner diameter and the shaft diameter;

DFT- the angular velocity of the shaft;

MDFT- braking torque damper.

The proposed damper mechanism of rotation of the excavator can reduce the peak load, increases the service life of the gear rotation mechanism, improves ergonomic conditions of the driver.

In Fig.1 shows a brake mechanism rotate with the hydraulic damper in the context of Fig.2 - section a-a in Fig.1.

The rotation mechanism consists of an axial piston hydraulic motor 1, a shaft 2 which is connected to the shaft-gear 3 gear flexible coupling comprising two coupling halves, the leading 4 and led 5, made with slots 6, and the rubber checkers 7. The brake mechanism of rotation of the disc type - normally-closed, consisting of a driven disk 8 with friction linings 9, the adjusting disk 10 is pressed against the slave disk 8 by the spring 11, is located between the elastic mu is rpusa, which is a driven disk 8 brake mechanism of rotation, with two radial partitions 13 and shaft 14 with two blades 15 mounted on the slots 6 slave coupling 5. The blades 15 of the shaft 14 is installed with a gap relative to the inner surface of the housing in the form of a slave disk 8, through which the throttled liquid when it is switched on or off turning mechanism for a limited angle. The size of the gap is determined from the following equation:

< / BR>
where b is the width of the blades;

W=W- dynamic viscosity of the liquid;

W- kinematic viscosity;

- the density of working fluid;

Z - number of blades;

l is the length of the slit;

D and D is the inner diameter and the shaft diameter;

DFT- the angular velocity of the shaft;

MDFT- braking torque damper.

To connect the damper to the work you want when you turn off the turning mechanism was trailing off and applying brakes. This is ensured by the admission of fluid to the brake cylinders 16 through uncontrollable throttle.

The device operates as follows.

When turned on, and the acceleration of the rotation mechanism in the first stage deistvitel shaft 2 of the motor 1 through the coupling to rotate the shaft 14 of the damper on some angle and reduce the value of dynamic torque by throttling fluid from one cavity of the damper to another through the gap between the blades 15 and the housing in the form of a slave disk 8. When turning off of the motor 1 and the slow rotation of the shaft 2, the clutch and the shaft 14 of the damper under the action of inertial forces of the rotating part of the excavator will rotate the damper casing with a friction lining 9 and the reverse movement of the shaft 14 of the damper and the damping part of the braking energy. When this occurs, the delay turn on the brakes because of the orifice in the hydroline cylinder 16 and the return of the blades 15 of the damper to its original position. The degree of delay is determined by the adjustment area of the throttle bore in the hydraulic drive.

The rotation mechanism of the excavator, containing the hydraulic motor, the shaft of which is connected to the shaft-gear reducer through an elastic coupling, consisting of slave and master hub and the brake disc type, wherein the rotation mechanism is further provided with a hydraulic damper, comprising a housing with radial partitions and shaft with blades placed on the slave coupling flexible coupling with a gap between the blades and the inner surface of the housing, the gap is defined by the following ratio:

< / BR>
where b is the width of the blades;

W=W- dynamic viscosity of the liquid;

W- kinematic viscosity of liquid the first diameter and the shaft diameter;

DFT- the angular velocity of the shaft;

MDFT- braking torque damper.

 

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