A one-way resistance progressive rotational damper

Abstract

This utility model relates to the field of damper technology, specifically to a unidirectional resistance-gradient rotary damper; it includes a housing, a rotating shaft, damping oil, and a cover plate: a limiting post is provided inside the housing; the outer periphery of the rotating shaft has a gradient profile and blades, with oil holes on the blades, and a one-way valve assembly movably disposed within the oil holes; when the rotating shaft rotates in a first direction, the one-way valve assembly closes the oil holes, and the gap between the gradient profile and the limiting post gradually decreases, resulting in a gradual increase in rotational resistance; when the rotating shaft rotates in a second direction, the one-way valve assembly opens the oil holes, reducing the rotational resistance. This utility model, through the above technical solution, provides a rotary damper capable of achieving unidirectional resistance-gradient variation.

Description

Technical Field

[0001] This utility model relates to the field of damper technology, specifically to a unidirectional resistance gradually changing rotary damper. Background Technology

[0002] Rotary dampers are widely used in various mechanical devices that require control of rotational speed, such as furniture hinged doors, car glove boxes, and hinge mechanisms. They generate damping torque during relative rotational motion by utilizing the viscous properties of damping oil, thereby achieving slow and smooth movement of moving parts.

[0003] Traditional rotary dampers typically provide only constant rotary damping. Even with adjustments to the damping magnitude through methods such as changing the damping oil, they cannot achieve gradual damping that increases with the stroke. In scenarios such as furniture flaps and equipment lids that require coordinated freefall movements, the required drop resistance increases with the drop height. Constant damping is insufficient to meet this requirement, easily leading to insufficient resistance in the later stages of the fall, causing impact collisions and affecting the stability and lifespan of the mechanism. Therefore, there is an urgent need for a rotary damper that can achieve unidirectional gradual resistance change. Utility Model Content

[0004] This invention solves the problems mentioned in the background art by using a gradually changing profile on the outer periphery of the rotating shaft to form a gradually changing gap with the limiting post inside the housing, and combining it with a one-way valve assembly at the oil hole of the blade to achieve a gradual increase in resistance when the rotating shaft rotates in the first direction and a decrease in resistance when it rotates in the second direction.

[0005] The purpose of this utility model is achieved as follows: a unidirectional resistance gradually varying rotary damper includes a housing, a rotating shaft, damping oil, and a cover plate.

[0006] The housing is equipped with a limiting post;

[0007] The outer periphery of the rotating shaft is provided with a gradient profile and blades, the blades are provided with oil holes, and a one-way valve assembly is provided in the oil holes;

[0008] When the shaft rotates along the first direction, the one-way valve assembly closes the oil hole, and the gap between the gradient profile and the limiting post gradually decreases, while the rotational resistance gradually increases; when the shaft rotates along the second direction, the one-way valve assembly opens the oil hole, and the rotational resistance decreases.

[0009] The present invention is further configured such that the gradient contour is an arc-shaped contour, and its radial dimension gradually increases along the first direction, so that the gradient contour has a narrow part and a wide part.

[0010] The present invention is further configured such that the one-way valve assembly includes a steel ball and an elastic retaining ring, the steel ball being movably disposed within the oil hole, and the elastic retaining ring being fixed to the blade to limit the movement range of the steel ball.

[0011] The present invention is further configured such that when the rotating shaft rotates in the first direction, the steel ball closes the oil hole; when the rotating shaft rotates in the second direction, the steel ball disengages from the oil hole.

[0012] The present invention is further configured such that when the rotating shaft rotates to its maximum angle along the first direction, the gradient contour abuts against the limiting post to form a rotation limit.

[0013] The present invention is further configured such that there are two blades, which are arranged circumferentially at intervals along the axis of rotation.

[0014] The present invention is further provided with a sealing ring between the upper end of the rotating shaft and the cover plate.

[0015] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0016] 1. By gradually reducing the gap between the gradient profile and the limiting post, the damping force increases with the rotation angle, which improves the stability and adaptability of the mechanism under conditions such as free fall.

[0017] 2. The unidirectional opening and closing is achieved through the cooperation of the steel ball and the oil hole, allowing the damping oil to flow smoothly in the second direction, which improves the ease and flexibility of operation.

[0018] 3. By using the arc-shaped structure with a gradually changing profile and the circumferentially spaced blades, the rotating shaft can achieve accurate positioning and stable rotation between the limiting posts, thereby improving the structural reliability of the damper and the consistency of the damping output. Attached Figure Description

[0019] Figure 1 This is an exploded view of this utility model;

[0020] Figure 2 This is a top view of the present invention;

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 4 This is a utility model Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0023] Figure 5 This is a schematic diagram of rotation in the first direction of this utility model;

[0024] Figure 6This is a schematic diagram of the second direction of rotation of this utility model.

[0025] The attached figures are labeled as follows: 1. Housing; 2. Shaft; 3. Damping oil; 4. Cover plate; 5. Limiting post; 6. Gradient profile; 60. Wide part of the profile; 61. Narrow part of the profile; 7. Blade; 8. Oil hole; 9. One-way valve assembly; 90. Steel ball; 91. Elastic retaining ring; 10. Sealing ring. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-6 :

[0027] Example 1:

[0028] This embodiment provides a unidirectional resistance gradually varying rotary damper, including a housing 1, a rotating shaft 2, damping oil 3, and a cover plate 4:

[0029] The housing 1 is provided with a limiting post 5;

[0030] The outer periphery of the rotating shaft 2 is provided with a gradient contour 6 and blades 7. The blades 7 are provided with oil holes 8, and the oil holes 8 are provided with one-way valve components 9.

[0031] When the rotating shaft 2 rotates along the first direction, the one-way valve assembly 9 closes the oil hole 8, and the gap between the gradient contour 6 and the limiting post 5 gradually decreases, and the rotational resistance gradually increases; when the rotating shaft 2 rotates along the second direction, the one-way valve assembly 9 opens the oil hole 8, and the rotational resistance decreases.

[0032] This one-way resistance gradually varying rotary damper mainly includes a housing 1, a rotating shaft 2, damping oil 3, a cover plate 4, a limiting post 5, blades 7, oil holes 8, a one-way valve assembly 9, and a sealing ring 10. Before installing the rotating shaft 2 into the housing 1, the steel ball 90 is movably placed in the oil hole 8 of the blade 7, and then the elastic retaining ring 91 is snapped and fixed at the port of the corresponding oil hole 8 on the blade 7, completing the assembly of the one-way valve assembly 9. Before the cover plate 4 is closed, the sealing ring 10 is embedded in the annular groove at the upper end of the rotating shaft 2, so that the sealing ring 10 is tightly fitted with the outer circumference of the rotating shaft 2. During assembly, a metered amount of damping oil 3 is first injected into the housing 1, and then the rotating shaft 2 is installed into the housing 1, so that the damping oil 3 immerses the area of ​​the blade 7 at the lower part of the rotating shaft 2. Then, the cover plate 4 is closed at the open end of the housing 1. The cover plate 4 can be fixedly connected to the housing 1 through a flange riveting process to form a sealed cavity.

[0033] The housing 1 is a cylindrical structure with one open end. A limiting post 5 is integrally formed on its inner bottom surface. The limiting post 5 extends axially and is used to abut against the gradient profile 6 on the rotating shaft 2 when the shaft 2 rotates to its limit position, thus providing a limiting function. The rotating shaft 2 is a stepped shaft, passing through the housing 1 and rotatable relative to it. The outer circumference of the rotating shaft 2 is provided with the gradient profile 6 and blades 7. The gradient profile 6 is located on the outer circumferential surface of the rotating shaft 2 and has an arc-shaped structure. The wider radial side of this arc-shaped profile is the wide section 60, and the narrower radial side is the narrow section 61. Its radial dimension gradually increases along a first direction, meaning the profile gradually widens from narrow. When the rotating shaft 2 rotates along the first direction, the portion of the gradient profile 6 opposite the limiting post 5 gradually transitions from the wide section 60 to the narrow section 61, causing the clearance between them to gradually decrease during rotation, thereby changing the flow space of the damping oil 3.

[0034] There are two blades 7, which are integrally formed with the rotating shaft 2 and are arranged at intervals along the circumference of the rotating shaft 2. The limiting post 5 is located between the two blades 7. Each blade 7 has an oil hole 8 that runs through both sides of the blade 7.

[0035] An oil hole 8 is equipped with a one-way valve assembly 9. This one-way valve assembly 9 is a component that can open and close the oil hole 8 according to the rotation direction of the rotating shaft 2. It can complete the closing and opening action of the oil hole 8 under the thrust of the damping oil 3 when the rotating shaft 2 rotates in different directions. The one-way valve assembly 9 consists of a steel ball 90 and an elastic retaining ring 91. The diameter of the steel ball 90 is larger than the minimum aperture of the oil hole 8, and it is movably placed inside the oil hole 8. The elastic retaining ring 91 is snapped and fixed on the blade 7 and located at one end of the oil hole 8. It is used to limit the range of movement of the steel ball 90 from the oil hole 8, so that the steel ball 90 can only move between the elastic retaining ring 91 and the inner wall of the oil hole 8.

[0036] A sealing ring 10 is provided between the upper end of the rotating shaft 2 and the cover plate 4. The sealing ring 10 is embedded in the annular groove at the upper end of the rotating shaft 2 and abuts against the inner wall of the cover plate 4. It is used to prevent the damping oil 3 in the housing 1 from leaking from the fit gap between the rotating shaft 2 and the cover plate 4, and to ensure that a sealed oil cavity is formed inside the housing 1.

[0037] During operation, the shaft 2 rotates within the housing 1. Damping oil 3 within the housing 1 submerges the blades 7 and the gradient profile 6 area of ​​the shaft 2. The viscous properties of the damping oil 3 provide the basic damping force for the damper. Its flow resistance is positively correlated with the size of the flow space; the smaller the flow space, the greater the viscous resistance of the damping oil 3. Simultaneously, the on / off state of the oil hole 8 directly determines the flow path of the damping oil 3, thus affecting its overall flow resistance. When the shaft 2 rotates along the first direction, the steel ball 90 moves towards the opening of the oil hole 8 under the thrust of the damping oil 3 and closes the oil hole 8, preventing the damping oil 3 from flowing through it. Simultaneously, as the shaft 2 continues to rotate, the gap between the arc-shaped gradient profile 6 on the outer periphery of the shaft 2 and the limiting post 5 on the inner wall of the housing 1 gradually decreases with the rotation angle, and the flow resistance of the damping oil 3 increases synchronously, causing the rotational resistance of the shaft 2 to gradually increase with the rotation process. When the shaft 2 rotates to its maximum angle along the first direction, the gradient profile 6 and the limiting post 5... The two parts abut against each other, forming a rotation limit for the rotating shaft 2, restricting the continued rotation of the rotating shaft 2; when the rotating shaft 2 rotates in a second direction opposite to the first direction, the steel ball 90 moves away from the oil hole 8 passage under the thrust of the damping oil 3, disengaging from the oil hole 8 and making the oil hole 8 open, so that the damping oil 3 can flow freely through the open oil hole 8, and the pressure inside the oil cavity is released. At this time, the rotational resistance of the rotating shaft 2 is greatly reduced, achieving a small damping rotation effect, which meets the usage requirements of the damper with gradual change of resistance in one direction and small damping rotation in the other direction.

[0038] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A unidirectional resistance gradually varying rotary damper, comprising a housing (1), a rotating shaft (2), damping oil (3), and a cover plate (4), characterized in that: The housing (1) is provided with a limiting post (5); The outer periphery of the rotating shaft (2) is provided with a gradient profile (6) and blades (7), and the blades (7) are provided with oil holes (8), and the oil holes (8) are provided with one-way valve assembly (9). When the shaft (2) rotates in the first direction, the one-way valve assembly (9) closes the oil hole (8), and the gap between the gradient profile (6) and the limiting post (5) gradually decreases, and the rotational resistance gradually increases; when the shaft (2) rotates in the second direction, the one-way valve assembly (9) opens the oil hole (8), and the rotational resistance decreases.

2. The unidirectional resistance gradually varying rotary damper according to claim 1, characterized in that, The gradient profile (6) is an arc-shaped profile, and its radial dimension gradually increases along the first direction, so that the gradient profile has a wide part (60) and a narrow part (61).

3. The unidirectional resistance gradually varying rotary damper according to claim 1, characterized in that, The one-way valve assembly (9) includes a steel ball (90) and an elastic retaining ring (91). The steel ball (90) is movably disposed in the oil hole (8), and the elastic retaining ring (91) is fixed on the blade (7) to limit the movement range of the steel ball (90).

4. A unidirectional resistance gradually varying rotary damper according to claim 3, characterized in that, When the shaft (2) rotates in the first direction, the steel ball (90) closes the oil hole (8); when the shaft (2) rotates in the second direction, the steel ball (90) disengages from the oil hole (8).

5. A unidirectional resistance gradually varying rotary damper according to claim 1, characterized in that, When the rotating shaft (2) rotates to its maximum angle along the first direction, the gradient contour (6) abuts against the limiting post (5) to form a rotation limit.

6. A unidirectional resistance gradually varying rotary damper according to claim 1, characterized in that, The blades (7) are two in number and are arranged circumferentially at intervals along the axis of rotation (2).

7. A unidirectional resistance gradually varying rotary damper according to claim 1, characterized in that, A sealing ring (10) is provided between the upper end of the rotating shaft (2) and the cover plate (4).

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