Piston end piece and magnetorheological damper piston

Abstract

The utility model discloses a piston end piece, which relates to the technical field of magneto-rheological dampers, is used in a magneto-rheological damper piston and comprises a piston end piece body, more than two protruding parts are arranged on the outer edge of the piston end piece body at intervals in the circumferential direction, and any protruding part extends towards the radial direction of the piston end piece body. An opening allowing magnetorheological fluid to circulate is formed between every two adjacent protruding parts, the openings are formed through the arrangement of the two or more protruding parts, machining can be conveniently conducted in a stamping mode, arc-shaped holes do not need to be machined through a milling machine, production efficiency can be remarkably improved, and production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetorheological dampers, in particular to a piston end piece and a piston of a magnetorheological damper. Background Art

[0002] A magnetorheological damper is a damping device using magnetorheological fluid as the medium. Its working principle is as follows: The cylinder body of the magnetorheological damper is filled with magnetorheological fluid. When the piston slides up and down in the cylinder body, the magnetorheological fluid flows through the damping gap on the piston. By applying currents with different intensities to the excitation coil on the piston iron core, magnetic fields with different intensities are generated in the damping gap, causing the magnetorheological fluid flowing through the damping gap to exhibit viscosity changes, thereby realizing the regulation of the damping force of the magnetorheological damper.

[0003] In the existing magnetorheological dampers, the used piston end pieces are usually provided with several arc-shaped holes for the circulation of magnetorheological fluid. The arc-shaped holes usually need to be machined by a milling machine, which has the problems of low processing efficiency and high processing cost. Therefore, it is an urgent problem to provide a piston end piece that is more convenient for production and processing, improve the processing efficiency, and reduce the processing cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a piston end piece that is more convenient for production and processing, so as to solve the problems existing in the above-mentioned prior art, improve the processing efficiency, and reduce the processing cost.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] A piston end piece for a piston of a magnetorheological damper, including a piston end piece body. Two or more protruding parts are arranged at intervals in the circumferential direction on the outer edge of the piston end piece body. Any one of the protruding parts extends radially towards the piston end piece body, and an opening allowing the magnetorheological fluid to flow through is formed between two adjacent protruding parts.

[0007] In an exemplary embodiment, the piston end piece includes an upper end piece for being installed at the upper end of the piston of the magnetorheological damper and a lower end piece for being installed at the lower end of the piston of the magnetorheological damper. Among them,

[0008] An installation hole for allowing the piston rod to pass through is arranged at the axis center of the piston end piece body of the upper end piece;

[0009] A positioning structure for cooperating with the piston iron core in the piston of the magnetorheological damper to keep the lower end piece concentric with the iron core is arranged on the piston end piece body of the lower end piece.

[0010] In an exemplary embodiment, the positioning structure is a positioning hole, or the positioning structure is a positioning protrusion protruding from the surface of the piston end piece body.

[0011] The present utility model also provides a piston of a magnetorheological damper, which includes a piston rod, a piston sleeve, a piston core, an upper end piece and a lower end piece. The upper end piece and the lower end piece adopt the above-mentioned piston end pieces. A through installation hole is provided at the center of the upper end piece. One end of the piston rod passes through the installation hole of the upper end piece and is connected to the upper end of the piston core. The lower end piece is coaxially installed at the lower end of the piston core. The piston sleeve is sleeved outside the upper end piece, the piston core and the lower end piece. Steps are provided at both ends of the piston sleeve, and the top of the steps is curled inward and buckled on the upper end piece and the lower end piece to form an integral piston.

[0012] In an exemplary embodiment, a transition fit or an interference fit is provided between the outer edge of the protruding portion of the upper end piece and the lower end piece and the vertical inner wall of the step.

[0013] In an exemplary embodiment, an external thread is provided at one end of the piston rod connected to the piston core, a threaded hole is provided at the center of the upper end of the piston core, and the piston rod is screwed into the threaded hole of the piston core through the external thread.

[0014] In an exemplary embodiment, a snap ring groove is provided on the piston rod, the snap ring groove is located between the upper end piece and the piston core, and a snap ring for axially positioning the upper end piece is provided in the snap ring groove.

[0015] In an exemplary embodiment, at least one winding groove is provided on the outer wall of the piston core, an exciting coil is wound in the winding groove, a central hole is axially provided inside the piston rod, a lead groove communicating with the winding groove and the central hole inside the piston rod is provided in the piston core, and the wire of the exciting coil is led out through the lead groove and the central hole in sequence.

[0016] In an exemplary embodiment, the steps at both ends of the piston sleeve are more than 0.5 mm higher than the upper end piece and the lower end piece before curling inward.

[0017] In an exemplary embodiment, the piston core is provided with a normally open small hole penetrating from the upper end to the lower end, and through holes communicating with the normally open small hole are provided on the upper end piece and the lower end piece.

[0018] By arranging more than two protruding portions at intervals in the circumferential direction of the outer edge of the piston end piece body of the present utility model, any one of the protruding portions extends radially towards the piston end piece body, and an opening allowing the magnetorheological fluid to flow through is formed between two adjacent protruding portions, which is convenient for processing the circumferential protruding portion structure by stamping, without using a milling machine to process an arc-shaped hole, and can significantly improve production efficiency and reduce production costs.

[0019] The piston of the magnetorheological damper disclosed in the present utility model has the corresponding technical effects of the above-mentioned piston end piece due to the adoption of the above-mentioned piston end piece, and thus will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic diagram of an exemplary embodiment of the upper end piece of the piston end piece disclosed in the present utility model;

[0022] Figure 2 Schematic diagram of an exemplary embodiment of the lower end piece of the piston end piece disclosed in the present utility model;

[0023] Figure 3 Cross-sectional schematic diagram of an exemplary embodiment of the magnetorheological damper piston disclosed in the present utility model;

[0024] Figure 4 Three-dimensional schematic diagram of an exemplary embodiment of the piston core disclosed in the present utility model;

[0025] Figure 5 For Figure 4 Cross-sectional schematic diagram;

[0026] Figure 6 Side view of an exemplary embodiment of the piston sleeve before curling disclosed in the present utility model;

[0027] Figure 7 For Figure 5 Cross-sectional schematic diagram taken along the A-A direction;

[0028] Wherein, 1, upper end piece; 2, lower end piece; 3, protruding part; 4, opening; 5, mounting hole; 6, positioning structure; 7, through hole; 8, piston rod; 9, piston sleeve; 10, piston core; 11, snap ring; 12, O-ring; 13, winding groove; 14, exciting coil; 15, central hole; 16, lead groove; 17, wire passing groove; 18, wire; 19, normally open small hole; 20, magnetorheological damper cylinder body; 21, guide strip; 22, guide strip mounting groove; 23, step. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] It should also be noted that in the embodiments of the present application, the same reference numerals are used to represent the same component or the same part.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0032] Any component provided by the present utility model can either be assembled from multiple separate components or be a single component manufactured by an integral forming process.

[0033] One of the purposes of the present utility model is to provide a piston end piece that is more convenient for production and processing, so as to solve the problems existing in the prior art, improve processing efficiency, and reduce processing costs.

[0034] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] This embodiment provides a piston end piece for a magnetorheological damper piston. Referring to Figures 1 to 2 , the piston end piece includes a piston end piece body. Two or more protruding parts 3 are arranged at intervals in the circumferential direction on the outer edge of the piston end piece body. Any one of the protruding parts 3 extends in the radial direction of the piston end piece body and away from the center of the piston end piece body. An opening 4 allowing the magnetorheological fluid to flow through is formed between two adjacent protruding parts 3. Since the protruding parts 3 on the circumference of the piston end piece body can be processed and formed by stamping, the processing is convenient and fast. There is no need to use a milling machine to mill an arc-shaped hole to form an opening for the magnetorheological fluid to pass through, which can significantly improve the processing efficiency, reduce the processing cost, and will not weaken the strength of the piston end piece body; as a preferred embodiment, the protruding parts 3 are evenly distributed in the circumferential direction of the piston end piece body to ensure that the damping force of the magnetorheological fluid acts evenly on the piston end piece.

[0036] As an implementation manner of this embodiment, when the piston end piece is applied to the piston of a magnetorheological damper, it includes an upper end piece 1 for being installed at the upper end of the piston of the magnetorheological damper, and a lower end piece 2 for being installed at the lower end of the piston of the magnetorheological damper. Among them, an installation hole 5 for the piston rod to pass through is provided at the axis of the piston end piece body of the upper end piece 1; a positioning structure 6 for cooperating with the piston iron core in the piston of the magnetorheological damper to keep the lower end piece concentric with the iron core is provided on the piston end piece body of the lower end piece 2.

[0037] As an implementation manner of this embodiment, the positioning structure 6 can be set as a positioning hole, or the positioning structure 6 can be set as a positioning protrusion protruding from the surface of the piston end piece body.

[0038] Another object of the present utility model is to provide a piston of a magnetorheological damper. Referring to Figures 3 to 7 , the piston of the magnetorheological damper includes a piston rod 8, a piston sleeve 9, a piston iron core 10, an upper end piece 1 and a lower end piece 2. A through installation hole 5 is provided at the axis of the upper end piece 1. One end of the piston rod 8 passes through the installation hole 5 of the upper end piece 1 and is connected to the upper end of the piston iron core 10. The lower end piece 2 is coaxially installed at the lower end of the piston iron core 10 through the positioning structure 6. The piston sleeve 9 is sleeved outside the upper end piece 1, the piston iron core 10 and the lower end piece 2. Steps 23 are provided at both ends of the piston sleeve 9. Referring to Figure 3 and Figure 7 , the top of the step 23 is curled inwards by means of press riveting or spin riveting and buckled on the upper end piece 1 and the lower end piece 2 to form an integral piston. The curled step 23 includes a horizontal part buckled on the upper end piece 1 and the lower end piece 2, and a vertical part located on the outer side surface of the outer edge of the upper end piece 1 and the lower end piece 2. Those skilled in the art are well aware that in order to ensure that the magnetorheological fluid can flow through the piston, holes can be opened on the iron core or the piston sleeve, or a gap allowing the magnetorheological fluid to pass through can be provided between the iron core and the piston sleeve. The way of leaving holes or gaps is not limited to one kind. For example, in this embodiment, the piston iron core 10 is provided with a through hole communicating with the openings 4 on both the upper end piece 1 and the lower end piece 2, or a gap communicating with the openings 4 on the upper end piece 1 and the lower end piece 2 is provided between the piston iron core 10 and the piston sleeve 9 to realize the flow of the magnetorheological fluid in the piston of the magnetorheological damper.

[0039] In order to further ensure the coaxiality of the upper end piece 1, the lower end piece 2 and the piston sleeve 9, and at the same time bear the lateral and axial loads of the piston sleeve 9 through the upper end piece 1 and the lower end piece 2, as an implementation manner of this embodiment, there is an interference fit or a transition fit between the outer edges of the protruding parts of the upper end piece 1 and the lower end piece 2 and the vertical inner walls of the steps 23.

[0040] To avoid the risk of the piston rod 8 being pulled out under large loads, as an implementation manner of this embodiment, one end of the piston rod 8 connected to the piston iron core 10 is provided with an external thread, and a threaded hole is provided at the center of the upper end of the piston iron core 10. The piston rod 8 is screwed into the threaded hole of the piston iron core 10 through the external thread, and the main damping force load and the end impact load are borne by the thread. The upper end piece 1 only needs to bear a very small part of the damping force load, avoiding the piston rod 8 from being pulled out.

[0041] As an implementation manner of this embodiment, referring to Figure 3 , a snap ring groove is provided on the piston rod 8. The snap ring groove is located between the upper end piece 1 and the piston iron core 10, and a snap ring 11 for axially positioning and locking the upper end piece 1 is provided in the snap ring groove.

[0042] As an implementation manner of this embodiment, referring to Figure 3 , an O-ring groove is further provided between the snap ring groove and the external thread on the piston rod 8. An O-ring 12 is provided in the O-ring groove to achieve the sealing fit between the piston rod 8 and the piston iron core 10.

[0043] As an implementation manner of this embodiment, referring to Figure 3 and Figure 4 , at least one winding groove 13 is provided on the outer wall of the piston iron core 10. An exciting coil 14 is wound in the winding groove 13. A central hole 15 is axially provided inside the piston rod 8. A lead groove 16 communicating with the winding groove 13 and the central hole 15 inside the piston rod 8 is provided in the piston iron core 10. The wire 18 of the exciting coil 14 is led out through the lead groove 16 and the central hole 15 in sequence. When there are two or more winding grooves 13, a wire passing groove 17 for the wire 18 to pass through is provided between adjacent winding grooves 13, so that the wires of two or more exciting coils 14 are continuously wound. When different intensities of current are applied to the exciting coil 14, different intensities of magnetic fields can be generated in the gap between the piston iron core 10 and the piston sleeve 9, changing the viscosity of the magnetorheological fluid flowing through the gap and regulating the damping force acting on the piston; As an implementation manner of this embodiment, insulating layers (not shown in the figure) are laid on the bottom and side walls of the winding groove 13, the lead groove 16 and the wire passing groove 17. After the exciting coil 14 is wound, a layer of insulating layer is also laid on the top of the exciting coil 14 to achieve full protection and insulation of the exciting coil 14.

[0044] As an implementation manner of this embodiment, the piston iron core 10 is made of a material with good magnetic conductivity, such as pure iron for electrical engineering, low-carbon steel, etc., while the upper end piece 1 and the lower end piece 2 are made of non-magnetic materials, such as aluminum alloy, 304 / 316 stainless steel, etc., to reduce magnetic leakage, so that the magnetic field is concentrated in the gap between the piston iron core 10 and the piston sleeve 9.

[0045] As an implementation manner of this embodiment, before the steps 23 at both ends of the piston sleeve 9 are curled inwards, they exceed the height of the upper end piece 1 and the lower end piece 2 by more than 0.5 mm. The upper limit value of the exceeded height can be adaptively adjusted according to the actual situation to ensure that the piston sleeve 9 can tightly fasten the upper end piece 1 and the lower end piece 2. At the same time, after the steps 23 are curled inwards, the opening 4 is not completely blocked and there is no interference with other structures.

[0046] In order to further enhance the damping effect of the magnetorheological fluid and the piston, as an implementation manner of this embodiment, referring to Figure 1 、 Figure 2 and Figure 5 , the piston core 10 may have a through hole 19 that runs through from the upper end to the lower end. Through holes 7 communicating with the through hole 19 are provided on the upper end piece 1 and the lower end piece 2. The number of the through holes 7 is not less than the number of the through hole 19. In other implementation manners, the through hole 19 and the through holes 7 may not be provided either.

[0047] As an implementation manner of this embodiment, referring to Figure 3 、 Figure 6 and Figure 7 , a guide band installation groove 22 is provided on the outer wall of the piston sleeve 9. A guide band 21 is provided between the guide band installation groove 22 and the inner wall of the magnetorheological damper cylinder body 20 to enable the piston of the magnetorheological damper to slide axially in the cylinder better. In other implementation manners, the guide band installation groove 22 and the guide band 21 may not be necessary structures.

[0048] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A piston end piece, which is used in a piston of a magnetorheological damper, is characterized in that: It includes a piston end piece body, and two or more protruding parts are arranged at intervals in the circumferential direction on the outer edge of the piston end piece body. Any one of the protruding parts extends radially towards the piston end piece body, and an opening allowing the magnetorheological fluid to flow through is formed between two adjacent protruding parts.

2. The piston end piece according to claim 1, characterized in that: The piston end piece includes an upper end piece for being installed at the upper end of the piston of the magnetorheological damper, and a lower end piece for being installed at the lower end of the piston of the magnetorheological damper, wherein, An installation hole for the piston rod to pass through is arranged at the axis center of the piston end piece body of the upper end piece; A positioning structure is arranged on the piston end piece body of the lower end piece for cooperating with the piston iron core in the magnetorheological damper piston to keep the lower end piece concentric with the iron core.

3. The piston end piece according to claim 2, characterized in that: The positioning structure is a positioning hole, or the positioning structure is a positioning protrusion protruding from the surface of the piston end piece body.

4. A piston of a magnetorheological damper, characterized in that: It includes a piston rod, a piston sleeve, a piston iron core, an upper end piece and a lower end piece. The upper end piece and the lower end piece adopt the piston end piece according to any one of claims 1 to 3. A through installation hole is arranged at the axis center of the upper end piece. One end of the piston rod passes through the installation hole of the upper end piece and is connected to the upper end of the piston iron core. The lower end piece is coaxially installed at the lower end of the piston iron core. The piston sleeve is sleeved outside the upper end piece, the piston iron core and the lower end piece. Steps are arranged at both ends of the piston sleeve, and the top of the step is curled inwards and buckled on the upper end piece and the lower end piece to form an integral piston.

5. The piston of the magnetorheological damper according to claim 4, characterized in that: There is an interference fit or a transition fit between the outer edges of the protruding parts of the upper end piece and the lower end piece and the vertical inner wall of the step.

6. The piston of the magnetorheological damper according to claim 4, characterized in that: An external thread is arranged at one end of the piston rod connected to the piston iron core, a threaded hole is arranged at the center of the upper end of the piston iron core, and the piston rod is screwed into the threaded hole of the piston iron core through the external thread.

7. The piston of the magnetorheological damper according to claim 6, characterized in that: A snap ring groove is arranged on the piston rod, the snap ring groove is located between the upper end piece and the piston iron core, and a snap ring for axially positioning the upper end piece is arranged in the snap ring groove.

8. The piston of the magnetorheological damper according to claim 4, characterized in that: At least one winding groove is arranged on the outer wall of the piston iron core, an excitation coil is wound in the winding groove, a central hole is axially arranged inside the piston rod, a lead groove communicating with the winding groove and the central hole inside the piston rod is arranged in the piston iron core, and the wire of the excitation coil is led out through the lead groove and the central hole in sequence.

9. The piston of the magnetorheological damper according to claim 4, wherein: Before the steps at both ends of the piston sleeve are curled inwards, they are more than 0.5 mm higher than the upper end piece and the lower end piece.

10. The piston of the magnetorheological damper according to claim 4, characterized in that: The piston iron core has a through small hole arranged from the upper end to the lower end, and through holes communicating with the through small hole are arranged on the upper end piece and the lower end piece.

Images