Piston ring type squeeze film damper
Through the combined design of the piston ring and the end cover, the use of lubricating oil extrusion and magnetic attraction, combined with the oil storage chamber and the spring groove, the problem of poor piston ring sealing is solved and the vibration reduction effect of the damper is improved.
Patent Information
- Application Number
- CN202423248562.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The existing piston ring type squeeze film damper has poor sealing effect under rapidly changing oil film pressure, resulting in poor vibration reduction effect of the damper.
The piston ring and end cover are designed in combination. The piston ring is made of ferromagnetic material and the end cover is a magnet. The piston ring is tightly attached to the oil film cavity through lubricating oil extrusion and magnetic attraction. An oil storage cavity and a spring groove are set between the inner ring and the outer ring. The spring provides axial tension to maintain the sealing effect.
It improves the sealing effect of the damper, reduces air intake, enhances the vibration reduction performance of the damper, and prevents sealing failure caused by relative rotation of the piston ring under high working conditions.
Smart Images
Figure CN223447542U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to damper technical field, concretely relates to a piston ring type extrusion oil film damper. BACKGROUND
[0002] The piston ring installed in the extrusion oil film damper mainly functions to reduce the leakage of lubricating oil from the oil film and the suction of external air, thereby increasing the damping coefficient of the extrusion oil film damper. After the piston ring is installed into the ring groove, the outer circle of the piston ring is tightly attached to the outer ring of the extrusion oil film damper under the action of its own elasticity, and the piston ring is pushed to the outside of the ring groove and tightly attached to the side wall of the ring groove under the action of oil pressure, achieving a sealing effect. The installation diagram of each piston ring is shown in FIG. Figure 1
[0003] In theory, lubricating oil can only flow out through the gap and oil leakage hole of the piston ring, and external air can only enter the inside of the extrusion oil film damper through the gap and oil leakage hole of the piston ring, and the fluid flow-out or flow-in channel is significantly reduced compared with the open extrusion oil film damper without the piston ring structure, thereby reducing the axial flow of lubricating oil and enabling the lubricating oil to be fully extruded, and in addition, effectively reducing the suction of air and improving the completeness of the oil film.
[0004] In fact, due to the large periodic change of the oil film pressure of the extrusion oil film damper, the relative angle of the gap of the two piston rings will also change, and the piston ring structure will be offset under the rapidly changing oil film pressure, which will lead to sealing failure. These factors will reduce the sealing effect of the piston ring structure and make the damping effect of the damper worse. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a piston ring type extrusion oil film damper to solve the problems of poor sealing effect of the piston ring and poor damping effect of the damper in the prior art.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0007] A piston ring type extrusion oil film damper, comprising an inner ring, an outer ring, two piston rings and two end covers, the outer ring is sleeved on the outside of the inner ring, an oil inlet hole is arranged on the outer ring, an oil film cavity is arranged between the inner ring and the outer ring, and the oil inlet hole is in communication with the oil film cavity; a gap is arranged on the piston ring, and the two piston rings are located in the oil film cavity; the two end covers are arranged on the left and right sides of the inner ring and the outer ring respectively, the end cover is fixedly connected with the outer ring, and a slight displacement can occur between the end cover and the inner ring, and the piston ring and the end cover cooperate to tightly attach the piston ring to the cavity wall of the oil film cavity.
[0008] Optionally, the piston ring is made of a ferromagnetic material, and the end cover is a magnet.
[0009] Optionally, spring grooves are uniformly arranged in the circumferential direction inside the end cover, springs are arranged in the spring grooves, one end of the spring is connected with the groove wall of the spring groove, and the other end of the spring is connected with the piston ring.
[0010] Optionally, at least three spring grooves are arranged in one end cover.
[0011] Optionally, two piston ring grooves are oppositely arranged on the inner ring and the outer ring, the opening of the piston ring groove on the inner ring is opposite to the opening of the piston ring groove on the outer ring, a gap is arranged between the inner ring and the outer ring, and the oil film cavity is a space enclosed by the piston ring grooves and the gap.
[0012] Optionally, the piston ring groove on the outer ring is larger than the piston ring groove on the inner ring.
[0013] Optionally, rubber is wrapped on the piston ring, and the part of the piston ring wrapped with rubber is tightly attached to the inner wall of the piston ring groove.
[0014] Optionally, the axial length of the inner ring is slightly smaller than the axial length of the outer ring.
[0015] Optionally, a sealing rubber ring is arranged between the inner ring and the end cover.
[0016] Optionally, an oil storage cavity is enclosed between the inner ring, the piston ring, the outer ring, the end cover and the sealing rubber ring.
[0017] Beneficial effects: the piston ring type extrusion oil film damper has the following advantages:
[0018] (1) the piston ring and the end cover are arranged, the piston ring is covered with rubber, the piston ring is tightly attached to the oil film cavity through the cooperation of the end cover and the piston ring in addition to the extrusion of the lubricating oil, and the cooperation between the end cover and the piston ring is not affected by the oil film pressure, compared with the extrusion mode of the oil film in the prior art, the sealing effect of the design is better, and the damping effect of the damper is improved.
[0019] (2) the oil storage cavity is arranged, the oil storage cavity can store a certain amount of lubricating oil, and the lubricating oil can reduce the air suction phenomenon in the oil film cavity of the damper, thereby increasing the damping effect.
[0020] (3) the spring grooves are arranged, the springs are arranged in the spring grooves, the axial tension is provided through the springs, the sealing effect is maintained, the design can prevent the relative rotation of the two piston rings when the damper works under high working conditions, thereby ensuring that the relative gap angle between the two piston rings remains consistent, and preventing the damping effect from being reduced due to the change of the relative gap angle. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1Fig. 1 is a schematic diagram of the overall structure of a damper in the background art;
[0022] Figure 2 Fig. 2 is a schematic diagram of the overall structure of a piston ring type squeeze oil film damper in Example 1;
[0023] Figure 3 Fig. 3 is a sectional view of the piston ring type squeeze oil film damper in Example 1;
[0024] Figure 4 Fig. 4 is a schematic diagram of the overall structure of a piston ring in Example 1;
[0025] Figure 5 Fig. 5 is a schematic diagram of the overall structure of a piston ring type squeeze oil film damper in Example 2;
[0026] Figure 6 Fig. 6 is a sectional view of the piston ring type squeeze oil film damper in Example 2.
[0027] In the figure: 1, inner ring; 2, piston ring; 3, outer ring; 4, end cover; 5, oil inlet hole; 6, oil film cavity; 7, notch; 8, rubber; 9, spring groove; 10, spring; 11, piston ring groove; 12, gap; 13, sealing rubber ring; 14, oil storage cavity. DETAILED DESCRIPTION
[0028] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the present application will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application.
[0029] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.
[0030] In the description of the utility model, it needs to be understood that the use of "first", "second" and other words to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning if there is no further declaration, so it cannot be understood as a limitation on the protection scope of the utility model.
[0031] Embodiment 1
[0032] As Figures 2-4 shown, the embodiment provides a piston ring type extrusion oil film damper, which comprises an inner ring 1, an outer ring 3, two piston rings 2 and two end covers 4, the inner ring 1 and the outer ring 3 are both cylindrical, the piston ring 2 and the end cover 4 are both circular, the outer ring 3 is sleeved on the outside of the inner ring 1, an oil inlet hole 5 is arranged on the outer ring 3, an oil film cavity 6 is arranged between the inner ring 1 and the outer ring 3, the oil inlet hole 5 communicates with the oil film cavity 6; a notch 7 is arranged on the piston ring 2, and the two piston rings 2 are both located in the oil film cavity 6; the two end covers 4 are arranged on the left and right sides of the inner ring 1 and the outer ring 3 respectively, the end cover 4 is fixedly connected with the outer ring 3, and a slight displacement can occur between the end cover 4 and the inner ring 1, and the piston ring 2 and the end cover 4 cooperate to tightly adhere the piston ring 2 to the cavity wall of the oil film cavity 6.
[0033] Specifically, the oil inlet hole 5 is a small circular hole arranged on the surface of the outer ring 3, the oil inlet hole 5 penetrates the outer ring 3 along the radial direction and communicates with the oil film cavity 6, and the number of the oil inlet hole 5 is determined according to the actual situation.
[0034] Preferably, the piston ring 2 is made of a ferromagnetic material, and the end cover 4 is a magnet; on one hand, the piston ring 2 can be tightly adhered to the cavity wall of the oil film cavity 6 through the extrusion of the lubricating oil, and on the other hand, the piston ring 2 can also be tightly adhered to the cavity wall of the oil film cavity 6 through the magnetic attraction between the end cover 4 and the piston ring 2, and the double effects make the sealing effect of the piston ring 2 better.
[0035] The piston ring type extrusion oil film damper of the utility model is provided with the piston ring 2 and the end cover 4, the piston ring 2 can be tightly adhered to the cavity wall of the oil film cavity 6 through the magnetic attraction between the end cover 4 and the piston ring 2 in addition to being tightly adhered to the cavity wall of the oil film cavity 6 through the extrusion of the lubricating oil, and the magnetic attraction between the end cover 4 and the piston ring 2 is not affected by the oil film pressure, compared with the existing technology which only uses the oil film extrusion, the sealing effect of the design is better, and the damping effect of the damper is improved.
[0036] In one of the embodiments, referring to Figure 3, two piston ring grooves 11 are oppositely arranged on the inner ring 1 and the outer ring 3, the openings of the piston ring grooves 11 on the inner ring 1 are opposite to the openings of the piston ring grooves 11 on the outer ring 3, a gap 12 is arranged between the inner ring 1 and the outer ring 3, and the oil film cavity 6 is a space enclosed by the piston ring grooves 11 and the gap 12; specifically, the two piston ring grooves 11 on the inner ring 1 and the two piston ring grooves 11 on the outer ring 3 are oppositely arranged with the oil inlet hole 5 as the axis, the cross section of the piston ring groove 11 is triangular, the cross section of the piston ring 2 is rectangular, and the piston ring 2 is further wrapped with rubber 8; specifically, the rubber 8 is wrapped on two adjacent surfaces of the piston ring 2, one of the surfaces wrapped with the rubber 8 is tightly attached to the inner wall of the piston ring groove 11 on the inner ring 1, and the other surface wrapped with the rubber 8 is tightly attached to the inner wall of the piston ring groove 11 on the outer ring 3, and a sealing surface is formed between the piston ring 2 and the piston ring groove 11.
[0037] In one of the embodiments, referring to Figure 3 , the piston ring groove 11 on the outer ring 3 is larger than the piston ring groove 11 on the inner ring 1.
[0038] In one of the embodiments, referring to Figure 3 , the axial length of the inner ring 1 is slightly smaller than the axial length of the outer ring 3, and there is a certain gap between the inner ring 1 and the end cover 4; a sealing rubber ring 13 is arranged in the gap between the inner ring 1 and the end cover 4, and an oil storage cavity 14 is enclosed between the inner ring 1, the piston ring 2, the outer ring 3, the end cover 4 and the sealing rubber ring 13; the oil storage cavity 14 can store a small amount of lubricating oil leaked from the sealing surface, and the lubricating oil can reduce the air suction phenomenon in the oil film cavity 6 of the damper, thereby increasing the damping effect.
[0039] Embodiment 2
[0040] As shown in Figures 4-6 , the embodiment provides a piston ring type extrusion oil film damper, which comprises an inner ring 1, an outer ring 3, two piston rings 2 and two end covers 4, the inner ring 1 and the outer ring 3 are both cylindrical, and the piston ring 2 and the end cover 4 are both circular; the outer ring 3 is sleeved outside the inner ring 1, the outer ring 3 is provided with an oil inlet hole 5, an oil film cavity 6 is arranged between the inner ring 1 and the outer ring 3, the oil inlet hole 5 is in communication with the oil film cavity 6; the piston ring 2 is provided with a notch 7, and the two piston rings 2 are both located in the oil film cavity 6; the two end covers 4 are respectively arranged on the left and right sides of the inner ring 1 and the outer ring 3, the end cover 4 is fixedly connected with the outer ring 3, a slight displacement can occur between the end cover 4 and the inner ring 1, and the piston ring 2 is tightly attached to the cavity wall of the oil film cavity 6 in cooperation with the end cover 4.
[0041] Specifically, the oil inlet hole 5 is a small circular hole arranged on the surface of the outer ring 3, the oil inlet hole 5 penetrates the outer ring 3 in the radial direction and is in communication with the oil film cavity 6, and the number of the oil inlet hole 5 is determined according to the actual situation.
[0042] Preferably, referring to Figure 6 , the end cover 4 is uniformly provided with spring grooves 9 inside in the circumferential direction, the spring grooves 9 are provided with springs 10, one end of the spring 10 is connected with the groove wall of the spring groove 9, the other end is connected with the piston ring 2, specifically, at least three spring grooves 9 are provided in one end cover 4; the axial tension is provided by the spring 10, the sealing effect is maintained, the relative rotation of the two piston rings 2 can be effectively prevented when the damper works under high working conditions, so as to ensure that the relative gap angle between the two piston rings 2 is consistent, and the damper effect is prevented from being reduced due to the change of the relative gap angle.
[0043] In one embodiment, referring to Figure 6 , the inner ring 1 and the outer ring 3 are relatively provided with two piston ring grooves 11, the opening of the piston ring groove 11 on the inner ring 1 is opposite to the opening of the piston ring groove 11 on the outer ring 3, the gap 12 is provided between the inner ring 1 and the outer ring 3, and the oil film cavity 6 is a space enclosed by the piston ring groove 11 and the gap 12; specifically, the two piston ring grooves 11 on the inner ring 1 and the two piston ring grooves 11 on the outer ring 3 are relatively arranged with the oil inlet hole 5 as the axis, the cross section of the piston ring groove 11 is triangular, the cross section of the piston ring 2 is rectangular, and the piston ring 2 is further wrapped with rubber 8, specifically, the rubber 8 is wrapped on two adjacent surfaces of the piston ring 2, one of the surfaces wrapped with rubber 8 is tightly attached to the inner wall of the piston ring groove 11 on the inner ring 1, and the other surface wrapped with rubber 8 is tightly attached to the inner wall of the piston ring groove 11 on the outer ring 3, and the sealing surface is formed between the piston ring 2 and the piston ring groove 11.
[0044] In one embodiment, referring to Figure 6 , the piston ring groove 11 on the outer ring 3 is larger than the piston ring groove 11 on the inner ring 1.
[0045] In one embodiment, referring to Figure 6 , the axial length of the inner ring 1 is slightly smaller than the axial length of the outer ring 3, and there is a certain gap between the inner ring 1 and the end cover 4; the sealing rubber ring 13 is arranged in the gap between the inner ring 1 and the end cover 4, and the oil storage cavity 14 is enclosed between the inner ring 1, the piston ring 2, the outer ring 3, the end cover 4 and the sealing rubber ring 13; the oil storage cavity 14 can store a small amount of lubricating oil leaked from the sealing surface, which can reduce the air suction phenomenon in the oil film cavity 6 of the damper, thereby increasing the damping effect.
[0046] Finally, it should be pointed out that: the above only describes the preferred embodiments of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A piston ring type squeeze film damper, characterized in that: The invention comprises an inner ring (1), an outer ring (3), two piston rings (2) and two end covers (4), wherein the outer ring (3) is sleeved on the outside of the inner ring (1), an oil inlet hole (5) is provided on the outer ring (3), an oil film cavity (6) is provided between the inner ring (1) and the outer ring (3), and the oil inlet hole (5) is communicated with the oil film cavity (6); a notch (7) is provided on the piston ring (2), and both the piston rings (2) are located in the oil film cavity (6); the two end covers (4) are respectively provided on the left and right sides of the inner ring (1) and the outer ring (3), the end covers (4) are fixedly connected to the outer ring (3), and a slight displacement can occur between the end covers (4) and the inner ring (1), and the piston ring (2) and the end covers (4) cooperate to make the piston ring (2) tightly attached to the wall of the oil film cavity (6).
2. The piston ring type squeeze film damper according to claim 1, characterized in that: The piston ring (2) is made of ferromagnetic material, and the end cover (4) is a magnet.
3. The piston ring type squeeze film damper according to claim 1, characterized in that: The end cover (4) is provided with spring grooves (9) uniformly along the circumferential direction. A spring (10) is provided in the spring groove (9). One end of the spring (10) is connected to the groove wall of the spring groove (9), and the other end is connected to the piston ring (2).
4. The piston ring type squeeze film damper according to claim 3, characterized in that: At least three spring slots (9) are provided in an end cover (4).
5. The piston ring type squeeze film damper according to any one of claims 1 to 4, characterized in that: Two piston ring grooves (11) are arranged opposite to each other on the inner ring (1) and the outer ring (3); the opening of the piston ring groove (11) on the inner ring (1) is opposite to the opening of the piston ring groove (11) on the outer ring (3); a gap (12) is arranged between the inner ring (1) and the outer ring (3); and the oil film cavity (6) is a space enclosed by the piston ring groove (11) and the gap (12).
6. The piston ring type squeeze film damper according to claim 5, characterized in that: The piston ring groove (11) on the outer ring (3) is larger than the piston ring groove (11) on the inner ring (1).
7. The piston ring type squeeze film damper according to claim 5, characterized in that: The piston ring (2) is wrapped with rubber (8), and the portion of the piston ring (2) wrapped with rubber (8) is in close contact with the inner wall of the piston ring groove (11).
8. The piston ring type squeeze film damper according to claim 1, characterized in that: The axial length of the inner ring (1) is slightly smaller than the axial length of the outer ring (3).
9. The piston ring type squeeze film damper according to claim 8, characterized in that: A sealing rubber ring (13) is provided between the inner ring (1) and the end cover (4).
10. The piston ring type squeeze film damper according to claim 9, characterized in that: An oil storage chamber (14) is enclosed between the inner ring (1), the piston ring (2), the outer ring (3), the end cover (4) and the sealing rubber ring (13).