CN202833642U - Rubber supporting bearing - Google Patents

Abstract

The utility model belongs to the compound technology of elastic bearings and relates to a rubber supporting bearing. The rubber support bearing includes a small joint, a group of spherical metal spacers, an intermediate transition metal piece, several layers of flat metal spacers and rubber layers between the spacers, and a large joint. Between the spherical metal spacer and the small joint, between the spherical metal spacer and the intermediate transition metal piece, and between the spherical metal spacers are vulcanized and bonded together through the rubber layer. The space between the flat metal spacer and the large joint and between the flat metal spacers are vulcanized and bonded together through the rubber layer, and the ratio of the total thickness of the rubber layer of the spherical metal spacer to the total thickness of the flat metal spacer is 1.0 ~10.0. The utility model has the advantages of making the compression stiffness and radial stiffness of the bearing realize stiffness matching within a relatively large load range, simple structure, free and flexible design, and the like.

Description

A rubber support bearing

technical field

The utility model belongs to the composite technology of elastic bearings and relates to a rubber supporting bearing.

Background technique

Helicopter rotor systems all use vibration damping devices, usually using elastic bearing structures to reduce the impact of rotor shimmy on the fuselage, which can withstand large centrifugal loads and large flapping shimmy pitch, effectively reducing the vibration of the fuselage. It avoids the ground resonance and air resonance of the helicopter, which greatly improves the safety and comfort of the helicopter. In addition, the use of elastic bearing structure can greatly improve the service life of the blade and rotor system, thereby prolonging the service life of the whole machine. key functional components.

The rubber support bearing in the prior art includes spherical metal spacers, flat metal spacers, rubber layers between the spacers, large and small joints, and intermediate transition metal pieces. Among them, the large joint is a flat metal structure, and the total thickness of the adhesive layer of the flat structure is too large, so that the radial stiffness of the elastic bearing is relatively low. When the radial stiffness is required, it is difficult for this structure to meet the design of radial stiffness and axial stiffness at the same time. Require.

Utility model content

The purpose of the utility model is to propose a rubber support bearing capable of matching the compression stiffness and the radial stiffness in a relatively large range.

The technical scheme of the utility model is: a rubber supporting bearing, which includes a small joint, a group of spherical metal spacers, an intermediate transition metal piece, several layers of flat metal spacers, and a large joint. The spherical metal spacers are made of spherical rubber The layers are bonded together, and one end of the bonded spherical metal spacer is connected to the small joint, and the other end is connected to the intermediate transition metal piece. The flat metal spacers are bonded together by the flat rubber layer, and the glued One end of the integrally connected flat metal spacer is connected to the intermediate transition metal piece, and the other end is connected to the large joint, wherein the ratio of the total thickness of the spherical rubber layer to the total thickness of the flat rubber layer is between 1.0 and 10.0.

The number of layers of the spherical metal spacer is 4-10 layers, and that of the flat metal spacer is 1-6 layers.

The thickness of the spherical metal spacer and the flat metal spacer is 0.5 mm to 1.5 mm, and the thickness tolerance is controlled at ±0.1 mm.

The thickness of the rubber layer of the spherical metal spacer and the thickness of the flat rubber layer are 0.5 mm to 2.0 mm.

Each spherical metal spacer is concentric, and the area between the spherical metal spacers from the small joint to the middle transitional metal structure gradually becomes larger, between the smallest spherical metal spacer and the small joint, between the largest spherical metal spacer and the middle The transitional metal structures and the spherical spacers are vulcanized and bonded together through the rubber layer.

There is a metal boss between the large joint and the flat rubber layer.

There are through holes in the center of the large joints, small joints, spherical metal spacers, flat metal spacers and intermediate transition metal parts, and the through holes are coaxial after being bonded into a whole by the adhesive layer.

The thickness of each spherical rubber layer should be guaranteed to be uniform and concentric with the center of the sphere, and the thickness of each flat rubber layer should be guaranteed to be uniform and parallel to each other.

The spherical metal spacer is rounded at the transition between the spherical surface and the curling edge. The inner circle radius R1 is R0.5mm-R3mm, and the outer circle radius R2 is R0.5mm-R4mm.

The utility model has the advantages that: the rubber support bearing of the utility model adopts multi-layer spherical bearing and multi-layer cylindrical bearing compound, and by controlling the number of layers of the spherical metal spacer and the flat metal spacer and the thickness of each rubber layer, the interface is maintained Under the premise of keeping the appearance size unchanged, the compression stiffness and radial stiffness can be matched within a large load range, meeting the different design requirements of the helicopter rotor system for elastic bearing compression stiffness, flapping stiffness, torsional stiffness, and radial stiffness. Moreover, the design is free and flexible, the structure is simple, the processing cost is low, and the forming is easy.

Description of drawings

Fig. 1 is a schematic structural view of the first embodiment of the rubber support bearing of the present invention.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a bottom view of Fig. 1 .

Fig. 4 is a sectional view along line A-A of Fig. 1 .

Fig. 5 is a cross-sectional view of the curling of the spherical metal spacer.

Fig. 6 is a schematic structural view of the second embodiment of the rubber support bearing of the present invention.

Fig. 7 is a B-B sectional view of Fig. 6 .

Among them, 1-small joint, 2-spherical rubber layer, 3-spherical metal spacer, 4-intermediate transition metal piece, 5-flat rubber layer, 6-flat metal spacer, 7-large joint, 8-metal boss .

Detailed ways

Below the utility model is described in further detail.

Referring to Figures 1 to 4, where Figure 1 is a schematic structural view of the first embodiment of the rubber support bearing of the present invention, Figure 2 is a top view of Figure 1, Figure 3 is a bottom view of Figure 1, and Figure 4 is A-A of Figure 1 cutaway view. In this embodiment, the rubber support bearing includes a group of spherical metal spacers, several layers of flat metal spacers, rubber layers between the spacers, large and small joints, and intermediate transition metal pieces.

After the group of spherical metal spacers 3 are vulcanized and bonded into one by the spherical rubber layer 2, each spherical metal spacer is concentric with the center of the sphere, the thickness of each spherical metal spacer is uniform, and the spherical metal spacers are small joints. The area between the intermediate transition metal parts gradually increases, between the smallest spherical metal spacer and the small joint, between the largest layer of spherical metal spacer and the intermediate transition metal part, and between each spherical metal spacer through rubber The layers are bonded together by vulcanization.

The thickness of the flat metal spacer 6 is uniform, and the spacers are parallel to each other after vulcanization and bonding of the flat rubber layer 5, and the bottom flat metal spacer is connected to the intermediate transition metal piece through the rubber layer. Cementing, the uppermost flat metal spacer is cemented with the large joint through the rubber layer, and vulcanized and bonded into one.

The center of the large joint 7, the small joint 1, the spherical metal spacer 3, the flat metal spacer 6 and the intermediate transition metal piece 4 are all provided with a round hole, and all the metal pieces are bonded into a whole through the glue layer. The central circular hole of the metal piece is coaxial.

The thickness of the spherical rubber layer 2 and the flat rubber layer 5 can be the same or different. The thickness of each spherical rubber layer should be uniform and concentric with the center of the sphere, and the thickness of each flat rubber layer 5 should be uniform and parallel to each other. However, the ratio of the total thickness of the spherical rubber layer to the total thickness of the flat rubber layer is controlled between 1.0 and 10.0, so as to achieve the matching of compression stiffness and radial stiffness within a relatively large load range.

The number of layers of the spherical metal spacer is 4-10 layers, and that of the flat metal spacer is 1-6 layers. The thickness of the spherical metal spacer 3 and the flat metal spacer 6 is 0.5mm-2mm, the thickness tolerance is controlled at ±0.1mm, and the material is stainless steel, alloy steel, aluminum alloy or titanium alloy. The materials of the large joint 7, the small joint 1 and the intermediate transition metal piece 4 are stainless steel, aluminum alloy and titanium alloy.

The spherical metal spacer 3 should be rounded at the transition between the spherical surface and the curling, as shown in Figure 5, the size of the inner radius R1 and the outer radius R2 should be reduced as much as possible under the condition that the process is satisfied, usually R1 takes R0.5mm~R3mm according to the thickness of the metal part and the molding process, and R2 takes R0.5mm~R4mm.

The working principle of the utility model is: the large joint 7 and the small joint 1 of the rubber support bearing are connected with the bearing sleeve and the flexible beam of the helicopter respectively. The dynamic load caused by the rotation of the propeller is transmitted to the small joint through the flexible beam, and then transmitted to the large joint step by step through each rubber layer. The deformation of each rubber layer plays a role of buffering and transitioning the dynamic load, thereby reducing the vibration of the fuselage. When the dynamic load caused by the rotation of the propeller is transmitted to the small joint of the bearing, it bears complex superimposed alternating loads of centrifugal, torsional, swinging, and radial directions at the same time. The service life of the bearing usually shows that fatigue cracks appear in the rubber layer and gradually deepen and expand. lead to bearing failure, and the fatigue cracks of the rubber layer are closely related to the equivalent strain under superimposed alternating loads. If the stiffness in one direction is too high, it will affect the overall damping performance of the bearing. If the stiffness is too low, the rubber layer will be over-strained. Therefore, according to the actual dynamic load of the blade, the stiffness index requirements in each direction will be given to the bearing. The utility model meets the bearing interface and the basic appearance size by controlling the spherical metal spacer The ratio of the total thickness of the adhesive layer to the total thickness of the flat metal spacer adhesive layer realizes the matching of compression stiffness and radial stiffness in a wide range, and has no major impact on torsional stiffness and flapping stiffness. The stiffness design index is flexibly optimized to meet the stiffness performance design requirements.

Embodiment one

A rubber support bearing, as shown in Figures 1 to 5. The small joint 1, the large joint 7, and the intermediate transition metal piece 4 are made of aluminum alloy, and the spherical metal spacer 3 is made of stainless steel, with a thickness of 0.6mm, and the thickness tolerance range is controlled within ±0.1mm. A set of spherical metal spacers is 7 pieces, the area of the small joint to the intermediate transition metal piece increases step by step, and the outer edge of each spherical metal spacer is curled. The spacers are kept concentric and coaxial, thereby ensuring that the spherical rubber layers are concentric and uniform in thickness.

The flat metal spacer 6 is a flat circular spacer made of stainless steel material, the thickness is 0.6mm, and the thickness tolerance range is controlled within ±0.1mm. The shape and size of each flat metal spacer are the same, and there are 2 flat metal spacers in total. The thickness uniformity of each flat rubber layer and the parallelism between the rubber layers are guaranteed by the flatness of the flat metal spacer and the precision molding die. In addition, there is a metal boss between the large joint and the flat rubber layer for adjusting and controlling the thickness of the flat rubber layer.

There is a threaded hole in the center of the small joint 1 for connection during assembly. The threaded hole runs through the small joint 1 and has a through hole in the center of other metal parts. The center through hole of the spherical metal spacer 3 and the flat metal spacer 6 and their outer edges It should have good coaxiality. After rubber vulcanization and molding, the central holes of all metal parts remain coaxial.

The thickness of the rubber layer connected to each spherical metal spacer is the same, and the thickness of the rubber layer connected to each flat circular spacer is the same. The ratio of the total thickness of the spherical rubber layer 2 to the total thickness of the flat rubber layer 5 is 3.5.

The spherical metal spacer 3 is rounded at the transition between the spherical surface and the curling edge, R1 is 2mm, and R2 is 3mm.

According to the test, the compression stiffness of the structural bearing is 4660N/mm, the radial stiffness is 236N/mm, and the ratio of compression stiffness to radial stiffness is 19.7, which can meet the stiffness matching design requirements under the condition of large radial load.

Embodiment two

A rubber support bearing, as shown in Figure 6 and Figure 7. The small joint 1, the large joint 7, and the intermediate transition metal piece 4 are made of aluminum alloy, and the spherical metal spacer 3 is made of stainless steel, with a thickness of 0.6mm, and the thickness tolerance range is controlled within ±0.1mm. A set of spherical metal spacers is 7 pieces, the area of the small joint to the intermediate transition metal piece increases step by step, and the outer edge of each spherical metal spacer is curled. The spacers are kept concentric and coaxial, thereby ensuring that the spherical rubber layers are concentric and uniform in thickness.

The flat metal spacer 6 is a flat circular spacer made of stainless steel, the thickness of which is 0.6mm, and the thickness tolerance range is controlled within ±0.1mm. The shape and size of each flat circular spacer are the same, and the flat circular spacer There are 4 layers in total. The thickness uniformity of each flat rubber layer and the parallelism between the rubber layers are guaranteed by the flatness of the flat metal spacer and the precision molding mold.

There is a threaded hole in the center of the small joint 1 for connection during assembly. The threaded hole runs through the small joint 1 and has a through hole in the center of other metal parts. The edge should have good coaxiality. After rubber vulcanization and molding, the central holes of all metal parts should remain coaxial.

The thickness of the rubber layer connected to each spherical metal spacer is the same, and the thickness of the rubber layer connected to each flat circular spacer is the same. The ratio of the total thickness of the spherical rubber layer 2 to the total thickness of the flat rubber layer 5 is 1.5.

The spherical metal spacer 3 is rounded at the transition between the spherical surface and the curling edge, R1 is 2mm, and R2 is 3mm.

The test results show that the compression stiffness of the structural bearing is 3070N/mm, the radial stiffness is 120N/mm, and the ratio of compression stiffness to radial stiffness is 25.6, which can meet the stiffness matching design requirements under the condition of small radial load.

Claims (9)

1. A rubber support bearing, which comprises a small joint, a group of spherical metal spacers, an intermediate transition metal piece, several layers of flat metal spacers, and a large joint, and the spherical metal spacer [3] consists of a spherical rubber layer [2 ] bonded into one, and one end of the bonded spherical metal spacer is connected to the small joint, and the other end is connected to the intermediate transition metal piece, and the flat metal spacer is bonded as a whole by a flat rubber layer [5] , and one end of the bonded flat metal spacer is connected to the intermediate transition metal piece, and the other end is connected to the large joint. It is characterized in that the ratio of the total thickness of the spherical rubber layer [2] to the total thickness of the flat rubber layer [5] is 1.0 ~10.0. 2. The rubber support bearing according to claim 1, characterized in that: the number of layers of the spherical metal spacer is 4-10 layers, and the number of layers of the flat metal spacer is 1-6 layers. 3. The rubber support bearing according to claim 2, characterized in that: the thickness of the spherical metal spacer [3] and the flat metal spacer [6] is 0.5 mm to 1.5 mm, and the thickness tolerance is controlled at ±0.1 mm . 4. Any rubber support bearing according to claim 3, characterized in that: the thickness of the rubber layer of the single-layer spherical metal spacer and the thickness of the flat rubber layer are 0.5 mm to 2.0 mm. 5. The rubber support bearing according to any one of claims 1 to 4, characterized in that: each spherical metal spacer is concentric, and the area between the small joint and the intermediate transitional metal structure of the spherical metal spacer gradually becomes larger , Between the smallest spherical metal spacer and the small joint, between the largest layer of spherical spacer and the intermediate transitional metal structure, and between the spherical spacers are vulcanized and bonded into one body through the rubber layer. 6. The rubber support bearing according to claim 5, characterized in that there is a metal boss between the large joint and the flat rubber layer. 7. The rubber support bearing according to claim 6, characterized in that: the large joint [7], the small joint [1], the spherical metal spacer [3], the flat metal spacer [6] and the intermediate transition metal There are through holes in the very center of the parts [4], and each through hole is coaxial after being bonded into a whole by the glue layer. 8. The rubber support bearing according to claim 7, characterized in that: the thickness of each spherical rubber layer should be uniform and concentric with the center of the sphere, and the thickness of each flat rubber layer [5] should be uniform and parallel to each other. 9. The rubber support bearing according to claim 7, characterized in that, the spherical metal spacer [3] is rounded at the transition between the spherical surface and the curling, R1 is R0.5mm-R3mm, R2 is R0.5mm ~R4mm.

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