Rotary damper

Abstract

The utility model relates to the technical field of automobile parts, in particular to a rotary damper. A rotary damper comprises a shell and a rotor, a check ring is inwards formed at the bottom of the shell, a damping cavity is formed between the inner wall of the shell and the check ring, an end cover is arranged on the upper portion of the rotor, an annular rotary core is arranged on the lower portion of the rotor, the rotary core is coaxially installed in the damping cavity, and damping liquid is injected into a gap between the damping cavity and the rotary core. A damping surface is axially arranged on the outer wall of the rotating core, a damping hole communicated with an inner cavity of the rotating core is formed in the damping surface, an annular surface is arranged on the inner side of the bottom of the end cover, the diameter of the annular surface is larger than that of the check ring, and a gap is reserved between the annular surface and the top of the check ring; and the convex ring is clamped on the clamping groove. The check ring has the advantages that the step is arranged on the outer wall of the top of the check ring, a gap is formed between the check ring and the ring face, no barrier exists, tight matching is guaranteed, and the rotating speed is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, and in particular to a rotary damper. Background Art

[0002] The existing rotary damper used for the roof handle of the car or the like is generally installed on the rotating shaft of the handle. The general structure of this type of damper is composed of a shell with a cavity and a rotor arranged in the shell cavity, and the cavity is filled with damping fluid. There are various rotor structures of this type of damper. Previously, the rotor was too tight in the shell, which affected the rotation speed. The damping effect was very good at the beginning of use, but after repeated use, the damping was reduced and the damping function was easily lost. Summary of the invention

[0003] In order to solve the technical problems that the rotor is too tightly fitted in the housing and the damping function is easily lost due to reduced damping, the utility model provides a rotary damper.

[0004] The technical solution of the utility model is as follows:

[0005] A rotary damper comprises a shell and a rotor, wherein a retaining ring is formed inwardly at the bottom of the shell, a damping cavity is arranged between the inner wall of the shell and the retaining ring, an end cover is arranged at the upper part of the rotor, and a circular ring-shaped rotating core is arranged at the lower part of the rotor. The rotating core is coaxially installed in the damping cavity, and a damping fluid is filled in the gap between the damping cavity and the rotating core. A damping surface is axially provided on the outer wall of the rotating core, and a damping hole connected to the inner cavity of the rotating core is provided on the damping surface. An annular surface is arranged on the inner side of the bottom of the end cover, and the diameter of the annular surface is larger than the diameter of the retaining ring. A gap is left between the annular surface and the top of the retaining ring. A circle of grooves is arranged on the upper inner wall of the shell, and a convex ring is arranged on the upper outer wall of the rotor, and the convex ring is clamped on the groove.

[0006] A sealing step is arranged at the opening of the shell, and a circle of depression is arranged at the upper part of the outer wall of the shell.

[0007] The outer wall of the rotating core has smooth cutouts on both sides, and two damping surfaces parallel to each other are arranged.

[0008] The damping surface is perpendicular to the diameter of the rotating core.

[0009] A damping groove is provided on the inner cavity wall of the rotating core at a position opposite to the damping surface.

[0010] A sealing ring a is sleeved on the bottom of the end cover, and the sealing ring a is sleeved on the rotating core.

[0011] The outer wall of the top of the retaining ring is provided with a step, and a sealing ring b is provided at the step.

[0012] The technical solution of the utility model has a novel structure and an ingenious and simple design. The outer wall of the top of the retaining ring is provided with a step, and there is a gap with the annular surface without obstruction, ensuring that it is not tightly fitted and does not affect the rotation speed. The damping hole connects the damping surface and the damping groove, which makes the rotating core obtain uniform resistance due to the obstruction of the flow of the damping fluid during the rotation process, and the damping effect is lasting and the service life is long; the setting of the damping groove makes the inner cavity of the rotating core also produce a damping effect with the damping oil, further making the resistance more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 , 2 It is a structural schematic diagram of the utility model;

[0014] Figure 3 It is a structural schematic diagram of the housing of the utility model;

[0015] Figure 4 , 5 It is a structural schematic diagram of the shell of the utility model. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Example

[0017] like Figure 1 , 2 , 3, 4, 5, a rotary damper, comprising a housing 6 and a rotor 1, wherein the upper outer wall of the housing 6 has a circle of depression, the bottom of the housing 6 forms a retaining ring 15 inwardly, a damping chamber 3 is provided between the inner wall of the housing 6 and the retaining ring 15, an end cover 7 is provided on the upper part of the rotor 1, a protrusion is provided on the top of the end cover 7 for external shaft clamping, a circular hole is provided in the middle of the end cover 7, and the edge is relatively rotating core 4 It extends outward to form a disc-shaped edge, and a sealing ring a8 is provided at the corner between the edge and the rotating core 4 to seal the gap between the damping chamber 3 and the rotating core 4. The lower part of the rotor 1 is an annular rotating core 4, which is coaxially installed in the damping chamber 3. The gap between the damping chamber 3 and the rotating core 4 is filled with damping fluid. There is a gap between the rotating core 4 and the bottom of the damping chamber 3, leaving a damping fluid space. A damping surface 9 is axially opened on the outer wall of the rotating core 4, and a damping hole 10 connected to the inner cavity of the rotating core 4 is opened on the damping surface 9. There is an annular surface on the inner side of the bottom of the end cover 7, and the diameter of the annular surface is greater than the diameter of the retaining ring 15. There is a gap between the annular surface and the top of the retaining ring 15. A circle of grooves is provided on the upper inner wall of the shell 6, and a convex ring is provided on the upper outer wall of the rotor 1. The convex ring is clamped on the groove. There are depressions on the inner and outer sides of the rotating core 4. There are more gaps left in the damping chamber, and the movement is smooth.

[0018] The opening of the housing 6 is provided with a sealing step 2, and the upper part of the outer wall of the housing 6 is provided with a circle of depression. The bottom surface of the sealing step 2 is flush with the top of the damping surface 9.

[0019] There are smooth cuts on both sides of the outer wall of the rotating core 4, and two damping surfaces 9 are parallel to each other. The damping surface 9 is a plane parallel to the axis of the rotating core 4, which is equivalent to cutting a plane shape on the cylindrical outer wall of the rotating core 4. The two damping surfaces 9 are parallel to each other and perpendicular to a diameter of the rotating core 4.

[0020] The damping surface 9 is perpendicular to the diameter of the rotating core 4 .

[0021] A damping groove 12 is provided on the inner cavity wall of the rotating core 4 at a position opposite to the damping surface 9 .

[0022] A sealing ring a8 is sleeved on the bottom of the end cover 7 , and the sealing ring a8 is sleeved on the rotating core 4 .

[0023] The outer wall at the top of the retaining ring 5 is provided with a step, and a sealing ring b is provided at the step. The step is lower than the top of the damping groove 12, has no contact, and is not easy to be rubbed.

[0024] When in use, the shell 6 is generally cylindrical, with an axial hole 13 extending from top to bottom in the center to accommodate the rotation of the external shaft. The damping chamber 3 is annular, coaxially arranged with the axial hole 13, the bottom of the damping chamber 3 is sealed, and the upper end is open. A sealing step 2 coaxial with the axial hole 13 is provided at the top of the damping chamber 3 on the shell 6. The sealing step 2 is used to clamp the sealing ring a8 to prevent the damping oil from leaking out. A circle of concave grooves 11 is provided at the waist position on the outer wall of the shell 6 to fix the axial position of the shell 6. A convex positioning block 5 is provided on the outer wall of the shell 6 along the axial direction to prevent the shell 6 from rotating. The combination of the groove 11 and the positioning block 5 can stably fix the shell 6 in the installation position. Since a damping surface 9 with a damping hole 10 is provided on the outer wall of the rotating core 4, the rotating core 4 Two damping surfaces 9 are provided on the outer wall thereof opposite to each other, a damping groove 12 is provided on the inner wall of the rotating core 4 at a position corresponding to the damping surface 9, the bottom plane of the damping groove 12 is parallel to the damping surface 9, and two damping holes 10 are provided on each damping surface 9, and the damping holes 10 connect the damping surface 9 and the damping groove 12, so that the rotating core 4 obtains uniform resistance due to the obstruction of the flow of the damping fluid during the rotation process, and the damping effect is long-lasting and the service life is long; the setting of the damping groove 12 enables the inner cavity of the rotating core 4 to also produce a damping effect with the damping oil, further making the resistance more uniform.

[0025] It should be understood that the above description is only a preferred embodiment of the present invention and is not sufficient to limit the technical solution of the present invention. For ordinary technicians in this field, within the spirit and principles of the present invention, additions, substitutions, changes or improvements can be made according to the above description, and all these additions, substitutions, changes or improved technical solutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A rotary damper, comprising a housing (6) and a rotor (1), characterized in that: A retaining ring (15) is formed inwardly at the bottom of the shell (6), a damping chamber (3) is provided between the inner wall of the shell (6) and the retaining ring (15), an end cover (7) is provided at the upper part of the rotor (1), a ring-shaped rotating core (4) is provided at the lower part of the rotor (1), the rotating core (4) is coaxially mounted in the damping chamber (3), a damping fluid is injected into the gap between the damping chamber (3) and the rotating core (4), a damping surface (9) is provided axially on the outer wall of the rotating core (4), a damping hole (10) connected to the inner chamber of the rotating core (4) is provided on the damping surface (9), an annular surface is provided on the inner side of the bottom of the end cover (7), the diameter of the annular surface is larger than the diameter of the retaining ring (15), a gap is left between the annular surface and the top of the retaining ring (15), a circle of clamping groove is provided on the upper inner wall of the shell (6), a convex ring is provided on the upper outer wall of the rotor (1), and the convex ring is clamped on the clamping groove.

2. A rotary damper according to claim 1, characterized in that: A sealing step (2) is provided at the opening of the shell (6), and a circle of depression is formed on the upper portion of the outer wall of the shell (6).

3. A rotary damper according to claim 1, characterized in that: The outer wall of the rotating core (4) has smooth cutouts on both sides, and is provided with two mutually parallel damping surfaces (9).

4. A rotary damper according to claim 1, characterized in that: The damping surface (9) is perpendicular to the diameter of the rotating core (4).

5. A rotary damper according to claim 1, characterized in that: A damping groove (12) is provided on the inner cavity wall of the rotating core (4) at a position opposite to the damping surface (9).

6. A rotary damper according to claim 1, characterized in that: A sealing ring a (8) is sleeved on the bottom of the end cover (7), and the sealing ring a (8) is sleeved on the rotating core (4).

7. A rotary damper according to claim 1, characterized in that: The outer wall of the top of the retaining ring (15) is provided with a step, and a sealing ring b is provided at the step.

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