A ball-hinged end-face constrained variable-damping stiffness vibration isolator

Abstract

The present invention relates to a ball-joint type end-face constrained variable-damping stiffness vibration isolator, belonging to the technical field of vibration damping devices. Both ends of the bow-shaped bracket of the vibration isolator are respectively supported on the vertical central axis through vibration isolation components; both ends of the central axis respectively have a necking section and a threaded section with gradually reduced diameters in sequence, and a connector assembly is sleeved on the middle section between the two necking sections at both ends through a slider; the vibration isolation component includes a stepped elastic barrel ring with its inner end embedded in the support hole at the bent end of the bow-shaped bracket; the outer end of the stepped elastic barrel ring is embedded in the inner embedded groove on the inner end face of the limit seat; the stepped elastic barrel ring has stepped inner holes corresponding to the inner end and the outer end respectively, and the small diameter of the stepped inner hole is larger than the diameter of the necking section of the central axis and smaller than the diameter of the middle section of the central axis.

Description

Technical Field

[0001] The present invention relates to a vibration isolator, in particular to a ball hinge type end-face constrained variable damping stiffness vibration isolator, belonging to the technical field of vibration reduction devices. Background Art

[0002] Retrieval shows that the Chinese patent document with the application number 201721464238.5 discloses "A Small Ball Hinge Tooth-shaped Vibration Damper". This vibration damper includes an outer gear ring assembly installed at both ends of an arcuate bracket, an inner gear ring assembly installed at both ends of a vertical central axis, and a connecting cylinder assembly installed in the middle of the central axis; the outer gear ring assembly includes an outer ring fixedly connected to the arcuate bracket and an inner gear fixed inside the outer ring, the inner gear ring assembly includes an inner ring fixedly connected to the central axis and an outer gear fixed outside the inner ring, the inner gear and the outer gear mesh with each other and at least one of them is made of an elastic material; the connecting cylinder assembly contains a slider that forms a moving pair with the central axis, the slider has a shaft end cavity for accommodating the inner end of the connecting shaft and is hinged to a horizontally extending connecting shaft through a ball hinge head, the connecting shaft and the central hole of the ball hinge head form a horizontal moving pair, and the inner end of the connecting shaft is wrapped with an elastic buffer pad, which can form various combined relationships to obtain zero stiffness, buffer vibration reduction, and elastic vibration absorption, and has unique vibration isolation, vibration reduction, and buffer effects.

[0003] However, with the continuous development and change of vibration reduction and isolation technologies, the technical solutions of the above patent present the following main areas for improvement in practice: 1) It fails to meet the required rotational decoupling requirements (decoupling means separating two kinds of motions); 2) The limiting angle is not easy to control. In addition, there are also deficiencies such as a relatively small elastic tooth load capacity, a risk of tooth skipping, and the inability to obtain damping when there is a gap between teeth and limited front and rear displacements. Summary of the Invention

[0004] The purpose of the present invention is: aiming at the above-mentioned areas for improvement existing in the prior art, through structural improvement, to propose a ball hinge type end-face constrained variable damping stiffness vibration isolator that can achieve rotational decoupling and is easy to meet the control of the limiting angle on the premise of meeting the basic requirements of vibration isolation.

[0005] To achieve the above purpose, the basic structure of the ball hinge type end-face constrained variable damping stiffness vibration isolator of the present invention is: including an arcuate bracket bent at both ends, and both ends of the arcuate bracket respectively support a vertical central axis through vibration isolation components; both ends of the central axis respectively have a necking section and a threaded section with gradually reduced diameters in sequence, and a connecting head assembly is sleeved on the middle section between the two necking sections through a slider.

[0006] The vibration isolation component includes a stepped elastic barrel ring with its inner end embedded in the support hole at the bent end of the bow-shaped bracket; the outer end of the stepped elastic barrel ring is embedded in the inner embedding groove on the inner end face of the limit seat; the stepped elastic barrel ring has stepped inner holes corresponding to the inner end and the outer end respectively, and the small diameter of the stepped inner hole is larger than the diameter of the necking section of the central shaft and smaller than the diameter of the middle section of the central shaft;

[0007] The outer end face of the limit seat has an outer embedding groove with a penetrating direction perpendicular to the inner embedding groove. A rectangular elastic limit block with a predetermined gap is embedded in the outer embedding groove. A cushion ring with its inner end limited to the outer end of the necking section of the central shaft is installed in the inner hole of the elastic limit block. The outer end of the cushion ring extends out an extension edge for pressing the elastic limit block; a fastener for pressing the elastic limit block through the extension edge is installed on the central shaft.

[0008] After adopting the present invention, not only axial and circumferential elastic buffer structures are provided, which can meet the vibration isolation requirements, but also the predetermined gap structure of the vibration isolation component not only realizes rotational decoupling, but also can adjust the rotation angle by setting the size of the gap as required, thus simply and reasonably solving the problems existing in the prior art.

[0009] A further improvement of the present invention is that the connector assembly includes an inner embedding plate fixedly connected to the slider. One end of the inner embedding plate away from the slider has a depression for the inner end of the cavity tube to insert and be fixedly connected to each other. The outer end of the cavity tube is inserted into the end face depression of the outer embedding plate and fixedly connected; the inner hole of the cavity tube has a middle partition ring. An articulated tube tightly fitted with the inner hole of the cavity tube is installed between the middle partition ring and the outer embedding plate. A connecting shaft is slidably fitted in the inner hole of the articulated tube. One end of the connecting shaft adjacent to the central shaft forms an enlarged diameter head located between the inner embedding plate and the middle partition ring, and a buffer pad wraps the enlarged diameter head. This connector structure enables the present invention to obtain the required front and rear damping displacements.

[0010] A further improvement of the present invention is that elastic washers are respectively lined on both sides of the buffer pad. Thus, the materials of the buffer pad and the elastic washers can be selected according to needs to realize variable damping constraints for the front and rear displacements.

[0011] A further improvement of the present invention is that the inner end of the stepped elastic barrel ring is a circular ring section and the outer end is a rectangular section. This is more conducive to ensuring rotational decoupling and realizing variable damping for rotational vibration isolation.

[0012] A further improvement of the present invention is that the extension edge is embedded in the depression at the outer end of the elastic limit block. In this way, by selecting the elastic material, the requirements for various vibration isolation damping changes in the central axis direction can be further met. Description of the Drawings

[0013] The following further describes the present invention with reference to the drawings.

[0014] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0015] Figure 2 is Figure 1 One of the schematic structural diagrams of the top view working state of the embodiment.

[0016] Figure 3 is Figure 1 The schematic three-dimensional structure diagram of the embodiment.

[0017] Figure 4 is Figure 1 The schematic three-dimensional exploded structure diagram of the embodiment. Specific implementation mode Embodiment 1

[0018] The ball hinge type end face constrained variable damping stiffness vibration isolator of this embodiment is as Figures 1 to 4 shown, and includes an arcuate bracket 1 with bent ends at both ends. The two ends of the arcuate bracket 1 are respectively supported by vibration isolation components 2 installed by screws 2-6 to support the vertical central axis 3; both ends of the central axis 3 respectively have a necking section 3-1 and a threaded section 3-2 with gradually reduced diameters in sequence. A connector assembly 5 is sleeved on the middle section 3-3 between the two necking sections through a slider 4.

[0019] The vibration isolation component 2 includes a stepped elastic barrel ring 2-4 with an inner end circular ring section embedded in the support hole at the bent end of the arcuate bracket; the outer end rectangular section of the elastic barrel ring 2-4 is embedded in the inner embedding groove 2n on the inner end face of the limit seat 2-3; the stepped elastic barrel ring 2-4 has stepped inner holes corresponding to the inner end circular ring section and the outer end rectangular section respectively. The small diameter of the stepped inner hole is larger than the diameter of the necking section 3-1 of the central axis 3 but smaller than the diameter of the middle section 3-3 of the central axis 3.

[0020] The outer end face of the limit seat 2-3 has an outer embedding groove 2w with a penetration direction perpendicular to the inner embedding groove 2n. A rounded rectangular elastic limit block 2-2 with a predetermined gap is embedded in the outer embedding groove 2w. The inner hole of the elastic limit block 2-2 is equipped with a gasket ring 2-5 with the inner end limited to the outer end of the necking section 3-1 of the central axis. The outer end of the gasket ring 2-5 extends out an extension edge that presses the elastic limit block 2-2; the extension edge is embedded in the depression at the outer end of the elastic limit block 2-2; a nut 2-1 that presses the elastic limit block 2-2 through the extension edge is installed on the central axis 3.

[0021] The connector assembly 5 includes an inlaid plate 5-1 fixedly connected to the slider 4 by countersunk screws. One end of the inlaid plate 5-1 away from the slider 4 has a depression where the inner ends of the insertion cavity tubes 5-2 are threadedly connected and fastened to each other. The inner hole of the cavity tube 5-2 has a middle partition ring, and its outer end is inserted into and fixedly connected to the end face depression of the outer inlaid plate 5-7. An articulated tube 5-6 that is tightly fitted with the inner hole of the cavity tube 5-2 is installed between the middle partition ring and the outer inlaid plate 5-7. A connecting shaft 5-4 is slidably fitted in the inner hole of the articulated tube 5-6. One end of the connecting shaft 5-4 adjacent to the central shaft 3 forms an enlarged diameter head located between the inlaid plate 5-1 and the middle partition ring. The enlarged diameter head wraps a buffer pad 5-8, and elastic washers 5-3 and 5-5 are respectively lined on both sides of the buffer pad 5-8.

[0022] In the prior art, the decoupling control of the limit angle and the front-back displacement is restricted by the tooth profile meshing structure, interdependent and mutually restrictive. In fact, it is almost impossible to set an appropriate backlash to meet the needs of both the front-back displacement and the angular displacement at the same time. In the structure of this embodiment, the axial displacement of the elastic limit block depends on the shape and size of the hole on the end face of the bow-shaped bracket, and is not affected by or does not affect the circumferential rotation. The rotation limit depends on the predetermined clearance between the elastic limit block and the limit seat, and the decoupling is convenient and easy to adjust. Secondly, when the elastic tooth meshing limit in the prior art is overloaded, it is inevitable to have tooth skipping or even tooth breakage due to relatively low rigidity. However, the limit structure of the inlaid groove of the limit seat in this embodiment (see Figure 2 ) completely solves this problem and improves the safety and reliability. In addition, according to needs, by selecting and changing the shape and hardness of the vulcanized rubber part of the rectangular elastic limit block 2-2, changing the hole shape, hole diameter and hardness of the stepped elastic barrel ring 2-4, changing the thickness and hardness of the elastic washers 55-3 and 5-5, installing springs and rubber pads with different stiffnesses between the central shaft 3 and the slider 4, etc.; various variable dampings can be very flexibly realized.

[0023] In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A ball hinge type end face constrained variable damping stiffness vibration isolator, comprising an arched bracket bent at both ends, and both ends of the arched bracket are respectively supported on a vertical central axis through vibration isolation components; characterized in that: Both ends of the central axis are respectively provided with a necking section and a threaded section with gradually decreasing diameters in sequence. A connector assembly is sleeved on the middle section between the two necking sections through a slider. The vibration isolation assembly includes a stepped elastic barrel ring with its inner end embedded in the support hole at the bent end of the bow-shaped bracket; the outer end of the stepped elastic barrel ring is embedded in the inner embedded groove on the inner end face of the limit seat; the stepped elastic barrel ring has stepped inner holes corresponding to the inner end and the outer end respectively, and the small diameter of the stepped inner hole is larger than the diameter of the necking section of the central axis and smaller than the diameter of the middle section of the central axis. The outer end face of the limit seat has an outer embedded groove with a penetration direction perpendicular to the inner embedded groove. An elastic limit block is embedded in the outer embedded groove. A gasket with its inner end limited to the outer end of the necking section of the central axis is installed in the inner hole of the elastic limit block. The outer end of the gasket extends out an extended edge for pressing the elastic limit block; a fastener for pressing the elastic limit block through the extended edge is installed on the central axis.

2. The ball hinge type end face constrained variable damping stiffness vibration isolator according to claim 1, characterized in that: The connector assembly includes an inner embedded plate fixedly connected to the slider. One end of the inner embedded plate away from the slider has a recess for the inner end of the cavity tube to be inserted and fixedly connected to each other. The outer end of the cavity tube is inserted into the end face recess of the outer embedded plate and fixedly connected; a middle partition ring is arranged in the inner hole of the cavity tube. A hinge tube tightly fitted with the inner hole of the cavity tube is installed between the middle partition ring and the outer embedded plate. A connecting shaft is slidably fitted in the inner hole of the hinge tube. One end of the connecting shaft adjacent to the central axis forms an enlarged diameter head located between the inner embedded plate and the middle partition ring, and a buffer pad wraps the enlarged diameter head.

3. The ball hinge type end face constrained variable damping stiffness vibration isolator according to claim 2, characterized in that: Elastic washers are respectively lined on both sides of the buffer pad.

4. The ball hinge type end face constrained variable damping stiffness vibration isolator according to claim 3, characterized in that: The inner end of the stepped elastic barrel ring is a circular ring section, and the outer end is a rectangular section.

5. The ball hinge type end face constrained variable damping stiffness vibration isolator according to claim 4, characterized in that: The extended edge is embedded in the recess at the outer end of the elastic limit block.

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