RU2068511C1 - Vibration isolator - Google Patents

Abstract

FIELD: self-propelled vehicles; vibration insulation of units. SUBSTANCE: vibration isolator has housing, core arranged in housing, resilient member with projection placed in circular clearance between housing and core and connected by outer side surface to housing and by inner surface, to core. It has also first and second washers, first washer has bead engaging with projection of resilient member and pressed to core. Outer diameter of first washer exceeds inner diameter of housing. Surfaces of resilient member at side of washers are made concave, and surface at outer side has circular limiting step engaging with second washer. Central through holes are made in core and washers. Screw passed through these holes projects from second washer. Gaskets are placed between core and washers. EFFECT: enhanced vibration insulation. 2 cl, 3 dwg

Description

 The invention relates to the field of vibration isolation technology and relates to vibration isolators for components of self-propelled machines.

Known vibration isolator containing a housing, a core located inside it, placed in an annular gap, between them an elastic element with a protrusion attached from the outside to the housing, and from the inside to the core, and the upper and lower washers, the latter being provided with a collar in contact with the protrusion of the elastic element and is drawn to the core [1]
In the known vibration absorber, the outer diameter of the lower washer is smaller than the inner diameter of the housing. With a large upward movement of the core, the elastic element may detach from the body and capsize the cab. The same thing can happen when the nut that compresses the lower washer is loosened.

Another vibration isolator is also known, comprising a housing, a core located in it with a central hole, located in an annular gap, between them an elastic element with a protrusion, attached by an outer lateral surface to the housing, an inner surface to the core, two washers installed from opposite ends of the core, the first washer made with a collar in contact with the protrusion of the elastic element, a screw passing through the Central holes of the core and washers and protruding above the second washer [2]
Known vibration isolator is the closest to the invention in terms of technical nature and the achieved result.

 In the known vibration absorber, the outer diameter of the lower washer is smaller than the inner diameter of the housing. With a large upward movement of the core, the elastic element may detach from the body and capsize the cab.

 In addition, in the known vibration absorber there is no sufficient restriction of movement. It can also lead to breaking ties during large movements of the cab. This all reduces reliability.

 The objective of the invention is to increase reliability with large vertical movements, increase fixation and reduce torque (tipping moment).

 This object is achieved in that the vibration isolator comprises a housing, a core located therein with a central hole, an elastic element with a protrusion located in the annular gap between them, an outer side surface attached to the housing, an inner surface to the core, two washers installed from opposite ends of the core, the first the washer is made with a collar in contact with the protrusion of the elastic element, a screw passing through the central holes of the core and washers and protruding above the second washer, the outer diameter emp first washer exceeds the internal diameter of the housing, the surface of the elastic member by the washers are concave on the outer side surface of the elastic member is formed restrictive protrusion disposed to come into contact with the second washer. Additionally, shims are located between the core and the washers.

In FIG. 1 shows a General view of the vibration isolator, a longitudinal section;
in FIG. 2 static characteristic of a vibration isolator;
in FIG. 3 static characteristics of the vibration isolator at a different gap between the core and the lower washer, where the curves a, b and c correspond to the gaps 0; 2.5 and 3.5 mm.

 The vibration isolator (Fig. 1) contains a housing 1, a core 2 located inside it, located in the annular gap between them, an elastic element 3 with protrusions 4 and 10, attached from the outside to the housing 1, and from the inside to the core 2, and the upper 5 and the bottom 6 of the washer, the latter having a collar 7 in contact with the protrusion 10 of the elastic element 3 and pressed against the core 2, the outer diameter of the lower washer 6 exceeds the inner diameter of the housing 1, the surface 8, 9 of the elastic element 3 from the side of the washers 5, 6 are concave, and the surface is on the outside and there is an annular restrictive protrusion 4 in contact with the upper washer 5. A central through hole 11 is made in the core 2 and the upper washer 5, and a screw 12 is located therein, which protrudes above the upper washer 5, and between the core 2 and the washers 5, 6 are shims 13, 14.

 Vibration isolator works as follows.

 When installing the bottom washer 6 screw 12 is pressed against the core 2 until it stops, deforming the elastic element. After installing a vibration-isolating object, such as a cab, the upper part of the elastic element 3 continues to deform, and the lower part with the protrusion 10 restores its original shape due to the displacement of the lower washer 6 down, reducing the rigidity of the vibration isolator and increasing the efficiency of vibration isolation.

 When the load increases above the nominal when the object moves down, the upper washer 5 starts to contact the protrusion 4 with a sharp increase in the stiffness of the vibration isolator, and when the object moves up the lower washer 6 compresses the protrusion 10 of the elastic element 3 also with a sharp increase in the stiffness of the vibration isolator, which increases reliability by maintaining connections and communications.

 The execution of the surfaces of the elastic element 3 concave provides a sharp increase in the rigidity of the vibration isolator when the washers 5 and 6 come in contact with the protrusions 4, 10 of the elastic element.

 As a result, the proposed device has a high vibration isolation efficiency, as it has a “soft” characteristic in the range of nominal loads on the vibration isolator (Fig. 2) and, at the same time, due to its design features, has the ability to limit the deviations of the vibration-insulated object to acceptable values and thereby ensures the safety of communications during the operation of machines. In addition, the proposed device does not allow separation of the cab from the machine in emergency conditions, which is necessary from the safety conditions of the operator.

 Thus, the implementation of the outer diameter of the lower washer in excess of the inner diameter of the housing 1, and the surfaces of the elastic element 3 from the side of the washer concave will improve the reliability of the vibration isolator. The execution of the screw 12 protruding above the upper washer for fastening the vibration isolation object does not require the use of elements to stop it from self-unscrewing and the screw falling down.

 Adjusting gaskets allow you to change the characteristic of the vibration isolator, because when they are installed, the load changes, at which a gap appears between the shoulder 7, for example, the lower washer 6 and the protrusion 4 of the elastic element 3 (Fig. 3).

Claims (2)

 1. Vibration isolator comprising a housing, a core located in it with a central hole, an elastic element with a protrusion located in the annular gap between them, attached by an outer lateral surface to the housing, an inner surface to the core, two washers mounted from opposite ends of the core, the first washer is made with a collar in contact with the protrusion of the elastic element, a screw passing through the Central holes of the core and washers and protruding above the second washer, characterized in that the outer surfaces are elastic th element by the washers are concave on the outer side surface of the elastic member is formed restrictive protrusion mounted for contacting the second washer, and the outer diameter of the first washer exceeds the internal diameter of the housing.  2. The vibration isolator according to claim 1, characterized in that it is equipped with shims installed between the core and the washers.

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