Cylindrical piston rod volume compensation structure for damper

Abstract

The invention discloses a cylindrical piston rod volume compensation structure for a damper, which is used in a single-cylinder single-rod damper or a double-cylinder magnetorheological damper and comprises a compensation valve, a compression valve, a cylindrical piston rod, a bolt and a nut. The barrel-type piston rod is of a barrel-shaped structure with the hollow interior, one closed end and the other open end, the barrel wall of the barrel-type piston rod is in a step shape, and the barrel-type piston rod comprises a large-diameter section and a small-diameter section. The thickness of the cylinder wall of the large-diameter section is larger than that of the cylinder wall of the small-diameter section, and the large-diameter section is located on one side of the open end. A compensation valve and a compression valve are arranged at the open end of the cylindrical piston rod and used for controlling compression and recovery stroke compensation performance. The compensation cavity of the cylinder type piston rod is used as a volume compensation cavity of a single-cylinder single-rod damper or a double-cylinder magnetorheological damper, the volume compensation cavity is creatively changed from the bottom to the built-in piston rod, the overall length of the damper is shortened, and integration and miniaturization of the damper structure are achieved.

Description

Technical Field

[0001] This invention relates to the field of buffer technology, specifically a cylindrical piston rod volume compensation structure for dampers. Background Technology

[0002] Due to the incompressibility of the working fluid, single-rod dampers must be equipped with a volumetric compensation structure to offset the volume change caused by piston rod displacement. Single-rod dampers have single-cylinder and double-cylinder structures. In existing technologies, double-cylinder structures achieve compensation through a gas chamber between the working cylinder and the reservoir; single-cylinder structures typically have a compensation space at the bottom of the steel cylinder, using a floating piston or diaphragm to isolate the gas, and some designs use an external auxiliary cylinder for compensation connected by pipelines. Current magnetorheological dampers generally adopt the above-mentioned single-cylinder structure and its volumetric compensation scheme, but there is a significant drawback: single-cylinder single-rod dampers generally require a large charging pressure, which will cause the damper to have a certain additional stiffness effect, affecting dynamic performance. Summary of the Invention

[0003] The purpose of this invention is to provide a cylindrical piston rod volume compensation structure for a damper, including a compensation valve, a compression valve, a cylindrical piston rod, bolts, and nuts.

[0004] The cylindrical piston rod is a hollow, closed-end, and open-end cylindrical structure. The cylinder wall of the piston rod is stepped, comprising a large-diameter section and a small-diameter section. The wall thickness of the large-diameter section is greater than that of the small-diameter section, and the large-diameter section is located on the open end side.

[0005] The open end of the cylindrical piston rod is provided with a compensation valve and a compression valve. The compression valve is located near the compensation chamber, which is the inner cavity of the cylindrical piston rod.

[0006] A through hole is provided at the center of the compensation valve and the compression valve. A bolt passes through the through hole and is fixed by a nut, so that the compensation valve and the compression valve are assembled on the cylindrical piston rod.

[0007] The compensation valve has several flow holes S1 spaced apart in the circumferential direction.

[0008] The compression valve has several flow holes S2 spaced apart in the circumferential direction.

[0009] The cylindrical piston rod volume compensation structure can be used in single-cylinder single-outlet rod dampers or double-cylinder magnetorheological dampers.

[0010] When used in a single-cylinder single-outlet rod damper / double-cylinder magnetorheological damper, the cylindrical piston rod is coaxially arranged inside the cavity of the single-cylinder single-outlet rod damper sleeve / double-cylinder magnetorheological damper sleeve, and the compensation cavity of the cylindrical piston rod is used as the volume compensation cavity of the single-cylinder single-outlet rod damper / double-cylinder magnetorheological damper.

[0011] The compensation chamber of the cylindrical piston rod is filled with gas, and the cavity of the single-cylinder single-outlet rod damper sleeve / double-cylinder magnetorheological damper sleeve is filled with liquid.

[0012] Furthermore, the distance between the through hole and the flow hole S1 on the compensation valve is less than the distance between the through hole and the flow hole S2 on the compression valve.

[0013] Furthermore, when the cylinder piston rod is pressed down, the liquid inside the sleeve and below the cylinder piston rod flows through the compensation valve under pressure and impacts the compression valve, causing the compression valve to bend upwards, thereby allowing the liquid to enter the compensation chamber and achieving volume compensation during the compression process.

[0014] When the cylindrical piston rod is pulled up, the liquid in the compensation chamber flows through the compression valve and impact compensation valve under pressure, causing the compensation valve to bend downwards, thereby allowing the liquid to enter the cavity below the cylindrical piston rod, achieving volume compensation during the recovery process.

[0015] Furthermore, the internal air pressure change of the single-cylinder single-outlet rod damper / double-cylinder magnetorheological damper depends on the square of the ratio of the outer diameter to the inner diameter of the cylindrical piston rod.

[0016] Furthermore, the end face of the closed end of the cylindrical piston rod is connected to a piston threaded connector.

[0017] Furthermore, when the cylindrical piston rod volume compensation structure is used in a single-cylinder single-outlet rod damper, the single-cylinder single-outlet rod damper also includes a damper sleeve.

[0018] The damper sleeve is a cylindrical structure that is hollow inside, closed at both ends, and has a receiving hole I on one of the closed ends.

[0019] The cylindrical piston rod is coaxially disposed inside the damper sleeve, and the small-diameter section of the cylindrical piston rod passes through the receiving hole I, so that the outer wall of the large-diameter section of the cylindrical piston rod and the inner wall of the damper sleeve form a damping channel I.

[0020] The large-diameter section of the cylindrical piston rod divides the damper sleeve cavity into upper liquid chamber I and lower liquid chamber I.

[0021] The upper liquid chamber I and the lower liquid chamber I are connected through a damping channel I.

[0022] The upper liquid chamber I is a cavity formed by the outer wall of the small-diameter section of the cylindrical piston rod and the inner wall of the damper sleeve. The lower liquid chamber I is a cavity formed by the compensating valve and the inner wall of the damper sleeve.

[0023] When the piston rod is pressed down, the liquid in the lower liquid chamber I flows through the compensation valve and impacts the compression valve under pressure, causing the compression valve to bend upwards, thereby allowing the liquid to enter the compensation chamber and achieving volume compensation during the compression process.

[0024] When the cylinder piston rod is pulled up, the liquid in the compensation chamber flows through the compression valve and impact compensation valve under pressure, causing the compensation valve to bend downwards, thereby allowing the liquid to enter the lower liquid chamber I, achieving volume compensation during the restoration process.

[0025] Furthermore, when the cylindrical piston rod volume compensation structure is used in a dual-cylinder magnetorheological damper, the dual-cylinder magnetorheological damper also includes an end cap I, an outer cylinder of the damper, a magnetic circuit assembly, an inner cylinder of the damper, and an end cap II.

[0026] The damper outer cylinder is a hollow cylindrical structure with open ends. End cap I and end cap II are respectively installed on the open ends. An accommodating hole II is provided in the center of end cap II.

[0027] The magnetic circuit assembly includes a yoke and a coil wound on the yoke.

[0028] The magnetic yoke and the inner cylinder of the damper are coaxially arranged in the outer cylinder of the damper, so that the inner wall of the outer cylinder of the damper forms a damping channel II and a flow channel cavity between the outer wall of the magnetic yoke and the outer wall of the inner cylinder of the damper, respectively. The damping channel II is connected to the flow channel cavity.

[0029] The damper inner cylinder is a hollow cylindrical structure with one open end and the other closed end, and the closed end has a receiving hole III. The closed end of the damper inner cylinder is attached to the end cap II, and the open end is connected to the magnetic yoke.

[0030] A flow hole S3 is provided on the inner wall of the damper near the end cap II, which is used to connect the inner cylinder cavity of the damper and the flow channel cavity.

[0031] One end of the magnetic yoke is connected to end cap I, and the other end is connected to the open end of the inner cylinder of the damper. A flow hole S4 is provided in the center of the magnetic yoke, and the flow hole S4 communicates with the cavity of the inner cylinder of the damper.

[0032] A flow hole S5 is provided on the side wall of the magnetic yoke near the end cap I. The flow hole S5 connects the damping channel II and the flow hole S4.

[0033] The cylindrical piston rod is coaxially disposed in the inner cylinder of the damper, and the small-diameter section of the cylindrical piston rod passes through the receiving hole II and the receiving hole III.

[0034] The large-diameter section of the cylindrical piston rod divides the inner cylinder of the damper into an upper liquid chamber II and a lower liquid chamber II.

[0035] The upper liquid chamber II is a cavity formed by the outer wall of the small-diameter section of the cylindrical piston rod and the inner wall of the damper inner cylinder. The lower liquid chamber II is a cavity formed by the compensating valve, the inner wall of the damper inner cylinder, and the magnetic yoke flow hole S4.

[0036] The upper liquid chamber II and the lower liquid chamber II are connected through the flow hole S5, the damping channel II, the flow channel cavity and the flow hole S3.

[0037] When the piston rod is pressed down, the liquid in the lower liquid chamber II flows through the compensation valve and impacts the compression valve under pressure, causing the compression valve to bend upwards, thereby allowing the liquid to enter the compensation chamber and achieving volume compensation during the compression process.

[0038] When the cylinder piston rod is pulled up, the liquid in the compensation chamber flows through the compression valve and impact compensation valve under pressure, causing the compensation valve to bend downwards, thereby allowing the liquid to enter the lower liquid chamber II, achieving volume compensation during the recovery process.

[0039] Furthermore, a friction ring is fitted on the outer wall of the large-diameter section of the cylindrical piston rod. The friction ring contacts the inner wall of the damper inner cylinder to prevent the liquid in the upper liquid chamber II and the lower liquid chamber II from flowing through the gap between the outer wall of the large-diameter section of the cylindrical piston rod and the inner wall of the damper inner cylinder.

[0040] Furthermore, the magnetic yoke is connected to the inner cylinder of the damper by threads and sealed with thread sealant.

[0041] The technical effects of this invention are undeniable, and its beneficial effects are as follows:

[0042] 1. Based on the structure of the traditional single-outlet damper, this invention creatively changes the volume compensation cavity from the bottom to the inside of the piston rod, shortening the overall length of the damper and realizing the integration and miniaturization of the damper structure.

[0043] 2. The present invention increases the volume of the volume compensation cavity, reduces the pressure change in the compensation cavity caused by compression and recovery, and reduces the additional stiffness effect caused by pressure change.

[0044] 3. When this invention is applied to a single-rod ordinary damper that uses hydraulic oil as the working medium, it can achieve the same mechanical effect as a double-cylinder bidirectional hydraulic shock absorber without using a floating piston or an external auxiliary cylinder, thus greatly simplifying the structure. Attached Figure Description

[0045] Figure 1 Schematic diagram of a cylindrical piston rod volume compensation structure used in a single-cylinder, single-outlet rod damper;

[0046] Figure 2 Schematic diagram of a cylindrical piston rod volume compensation structure used in a double-cylinder magnetorheological damper;

[0047] Figure 3 A schematic diagram (single cylinder) showing the volume compensation of magnetorheological fluid entering and exiting the inner cavity as the piston moves.

[0048] In the diagram: 1. Damper sleeve; 2. Compensating valve; 3. Compression valve; 4. Cylindrical piston rod; 5. Piston threaded connector; 6. Bolt; 7. Damping channel I; 8. End cap I; 9. Damper outer cylinder; 10. Magnetic yoke; 11. Damper inner cylinder; 12. End cap II; 13. Flow hole S1; 14. Flow hole S5. Detailed Implementation

[0049] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0050] Example 1:

[0051] See Figure 1 or Figure 2 A cylindrical piston rod volume compensation structure for a damper includes a compensation valve 2, a compression valve 3, a cylindrical piston rod 4, a bolt 6, and a nut.

[0052] The cylindrical piston rod 4 is a hollow, closed-end, and open-end cylindrical structure. The cylindrical wall of the cylindrical piston rod 4 is stepped, including a large-diameter section and a small-diameter section. The wall thickness of the large-diameter section is greater than that of the small-diameter section, and the large-diameter section is located on the open end side.

[0053] The open end of the cylindrical piston rod 4 is provided with a compensation valve 2 and a compression valve 3. The compression valve 3 is located near the compensation chamber, which is the inner cavity of the cylindrical piston rod 4.

[0054] A through hole is provided at the center of the compensation valve 2 and the compression valve 3. The bolt 6 passes through the through hole and is fixed by the nut, so that the compensation valve 2 and the compression valve 3 are assembled on the cylindrical piston rod 4.

[0055] The compensation valve 2 has several flow holes S1 spaced apart in the circumferential direction.

[0056] The compression valve 3 has several flow holes S2 spaced apart in the circumferential direction.

[0057] The cylindrical piston rod volume compensation structure can be used in single-cylinder single-outlet rod dampers or double-cylinder magnetorheological dampers.

[0058] When used in a single-tube single-outlet rod damper / double-tube magnetorheological damper, the cylindrical piston rod 4 is coaxially arranged in the cavity of the single-tube single-outlet rod damper sleeve / double-tube magnetorheological damper sleeve, and the compensation cavity of the cylindrical piston rod 4 is used as the volume compensation cavity of the single-tube single-outlet rod damper / double-tube magnetorheological damper.

[0059] The compensation chamber of the cylindrical piston rod 4 is filled with gas, and the cavity of the single-cylinder single-outlet rod damper sleeve / double-cylinder magnetorheological damper sleeve is filled with liquid.

[0060] Example 2:

[0061] The main structure of this embodiment is the same as that of embodiment 1. Furthermore, the distance between the through hole and the flow hole S1 on the compensation valve 2 is less than the distance between the through hole and the flow hole S2 on the compression valve 3.

[0062] Example 3:

[0063] The main structure of this embodiment is the same as any one of embodiments 1 to 2. Furthermore, when the cylindrical piston rod 4 is pressed down, the liquid inside the sleeve and below the cylindrical piston rod 4 flows through the compensation valve 2 under pressure and impacts the compression valve 3, causing the compression valve 3 to bend upward, thereby allowing the liquid to enter the compensation chamber and realize volume compensation during the compression process.

[0064] When the cylindrical piston rod 4 is pulled up, the liquid in the compensation chamber flows through the compression valve 3 and impacts the compensation valve 2 under pressure, causing the compensation valve 2 to bend downwards, thereby allowing the liquid to enter the cavity below the cylindrical piston rod 4, thus achieving volume compensation during the restoration process.

[0065] Example 4:

[0066] The main structure of this embodiment is the same as any one of embodiments 1 to 3. Furthermore, the internal air pressure change of the single-cylinder single-outlet rod damper / double-cylinder magnetorheological damper depends on the square of the ratio of the outer diameter to the inner diameter of the cylindrical piston rod 4.

[0067] According to the ideal gas compression equation, the change in volume is inversely proportional to the change in pressure. Other dampers have small overall compensation chamber volumes, resulting in a large rate of volume change during the piston stroke as the piston rod moves in and out of the damper. This invention increases the overall compensation chamber volume, allowing the piston rod to experience a smaller rate of volume change within its maximum allowable stroke (= changed volume / overall volume, the denominator is larger, therefore the overall volume is smaller), thus leading to a smaller change in compensation pressure.

[0068] Example 5:

[0069] The main structure of this embodiment is the same as any one of embodiments 1 to 4. Furthermore, the end face of the closed end of the cylindrical piston rod 4 is connected to a piston threaded connector 5.

[0070] Example 6:

[0071] The main structure of this embodiment is the same as any one of embodiments 1 to 5. Furthermore, when the cylindrical piston rod volume compensation structure is used for a single-cylinder single-outlet rod damper, the single-cylinder single-outlet rod damper also includes a damper sleeve 1.

[0072] The damper sleeve 1 is a cylindrical structure that is hollow inside, closed at both ends, and has a receiving hole I on one of the closed ends.

[0073] The cylindrical piston rod 4 is coaxially disposed inside the damper sleeve 1, and the small-diameter section of the cylindrical piston rod 4 passes through the receiving hole I, so that a damping channel I7 is formed between the outer wall of the large-diameter section of the cylindrical piston rod 4 and the inner wall of the damper sleeve 1.

[0074] The large-diameter section of the cylindrical piston rod 4 divides the cavity of the damper sleeve 1 into an upper liquid chamber I and a lower liquid chamber I.

[0075] The upper liquid chamber I and the lower liquid chamber I are connected by a damping channel I7.

[0076] The upper liquid chamber I is the cavity formed by the outer wall of the small-diameter section of the cylindrical piston rod 4 and the inner wall of the damper sleeve 1. The lower liquid chamber I is the cavity formed by the compensating valve 2 and the inner wall of the damper sleeve 1.

[0077] When the piston rod 4 is pressed down, the liquid in the lower liquid chamber I flows through the compensation valve 2 and impacts the compression valve 3 under pressure, causing the compression valve 3 to bend upward, thereby allowing the liquid to enter the compensation chamber and realizing volume compensation during the compression process.

[0078] When the cylinder piston rod 4 is pulled up, the liquid in the compensation chamber flows through the compression valve 3 and impacts the compensation valve 2 under pressure, causing the compensation valve 2 to bend downwards, thereby allowing the liquid to enter the lower liquid chamber I, thus achieving volume compensation during the restoration process.

[0079] Example 7:

[0080] The main structure of this embodiment is the same as that of embodiment 6. Furthermore, the diameter of the receiving hole I is slightly larger than the diameter of the small diameter section of the cylindrical piston rod, which is used to set a sealing ring. The sealing ring allows the small diameter section of the cylindrical piston rod 4 to seal the liquid inside the damper during the tension and compression process.

[0081] The diameter of the receiving hole I is smaller than the diameter of the large diameter section of the cylindrical piston rod, and it is used to limit the movement of the cylindrical piston rod 4.

[0082] Example 8:

[0083] The main structure of this embodiment is the same as any one of embodiments 1 to 5. Further, see [link to embodiment 1-5]. Figure 2 When the cylindrical piston rod volume compensation structure is used in a dual-cylinder magnetorheological damper, the dual-cylinder magnetorheological damper further includes an end cap I8, an outer damper cylinder 9, a magnetic circuit assembly, an inner damper cylinder 11, and an end cap II12.

[0084] The damper outer cylinder 9 is a hollow cylindrical structure with open ends. End caps I 8 and II 12 are respectively installed on the open ends. An accommodating hole II is provided in the center of the end cap II 12.

[0085] The magnetic circuit assembly includes a yoke 10 and a coil wound on the yoke 10.

[0086] The magnetic yoke 10 and the inner cylinder 11 of the damper are coaxially arranged in the outer cylinder 9 of the damper, so that the inner wall of the outer cylinder 9 of the damper forms a damping channel II and a flow channel cavity between the outer wall of the magnetic yoke 10 and the outer wall of the inner cylinder 11 of the damper, respectively.

[0087] The damping channel II is connected to the flow channel cavity.

[0088] The inner cylinder 11 of the damper is a hollow cylindrical structure with one open end and the other closed end, and the closed end has a receiving hole III. The closed end of the inner cylinder 11 is attached to the end cap II 12, and the open end is connected to the magnetic yoke 10.

[0089] A flow hole S3 is provided on the cylinder wall of the inner cylinder 11 near the end cap II12, which is used to connect the cavity of the inner cylinder 11 and the flow channel cavity.

[0090] One end of the magnetic yoke 10 is connected to the end cap I8, and the other end is connected to the open end of the inner cylinder 11 of the damper. A flow hole S4 is provided in the center of the magnetic yoke 10, and the flow hole S4 communicates with the cavity of the inner cylinder 11 of the damper.

[0091] A flow hole S5 is provided on the side wall of the magnetic yoke 10 near the end cap I8. The flow hole S5 connects the damping channel II and the flow hole S4.

[0092] The cylindrical piston rod 4 is coaxially disposed in the inner cylinder 11 of the damper, and the small diameter section of the cylindrical piston rod 4 passes through the receiving hole II and the receiving hole III.

[0093] The large-diameter section of the cylindrical piston rod 4 divides the cavity of the inner cylinder 11 of the damper into an upper liquid chamber II and a lower liquid chamber II.

[0094] The upper liquid chamber II is a cavity formed by the outer wall of the small diameter section of the cylindrical piston rod 4 and the inner wall of the inner cylinder 11 of the damper. The lower liquid chamber II is a cavity formed by the compensating valve 2, the inner wall of the inner cylinder 11 of the damper, and the flow hole IV 101 of the magnetic yoke 10.

[0095] The upper liquid chamber II and the lower liquid chamber II are connected through the flow hole S5, the damping channel II, the flow channel cavity and the flow hole S3.

[0096] When the piston rod 4 is pressed down, the liquid in the lower liquid chamber II flows through the compensation valve 2 and impacts the compression valve 3 under pressure, causing the compression valve 3 to bend upward, thereby allowing the liquid to enter the compensation chamber and realizing volume compensation during the compression process.

[0097] When the cylinder piston rod 4 is pulled up, the liquid in the compensation chamber flows through the compression valve 3 and impacts the compensation valve 2 under pressure, causing the compensation valve 2 to bend downwards, thereby allowing the liquid to enter the lower liquid chamber II, thus achieving volume compensation during the restoration process.

[0098] Example 9:

[0099] The main structure of this embodiment is the same as that of embodiment 8. Furthermore, the diameters of the receiving holes II and III are slightly larger than the diameter of the small diameter section of the cylindrical piston rod, which are used to set the sealing ring. The sealing ring allows the small diameter section of the cylindrical piston rod 4 to seal the liquid inside the damper during the tension and compression process.

[0100] The diameters of the receiving holes II and III are smaller than the diameter of the large-diameter section of the cylindrical piston rod, and are used to limit the movement of the cylindrical piston rod 4.

[0101] Example 10:

[0102] The main structure of this embodiment is the same as any one of embodiments 8 to 10. Furthermore, a friction ring is sleeved on the outer wall of the large diameter section of the cylindrical piston rod 4. The friction ring contacts the inner wall of the inner cylinder 11 of the damper and is used to prevent the liquid in the upper liquid chamber II and the lower liquid chamber II from flowing through the gap between the outer wall of the large diameter section of the cylindrical piston rod 4 and the inner wall of the inner cylinder 11 of the damper.

[0103] Example 11:

[0104] The main structure of this embodiment is the same as any one of embodiments 8 to 11. Furthermore, the magnetic yoke 10 and the damper inner cylinder 11 are connected by threads and sealed with thread sealant.

[0105] Example 12:

[0106] The main structure of this embodiment is the same as any one of embodiments 1 to 11. Further, see [link to embodiment 1]. Figure 1 It mainly includes a damper sleeve 1, a compensation valve 2 with a flow hole I 21, a compression valve 3 with a flow hole II 31, a cylindrical piston rod 4, a piston threaded connector 5, and a fixing bolt 6.

[0107] The bottom of the cylindrical piston rod 4 of the damper is thickened to form a gap damping channel with the outer damper sleeve. The damping force output by the damper is provided by this channel. The cylindrical piston rod 4 only provides volume compensation function.

[0108] When the cylindrical piston rod 4 is at its lowest point, the built-in compensation chamber should be in a state where liquid and air coexist, to avoid excessive compression of the damper and gas leakage from the compensation chamber.

[0109] The damper compression valve 3 and compensation valve 2 can isolate the compensation chamber and liquid chamber of the cylindrical piston rod 4, preventing air from flowing into the liquid when it is stationary.

[0110] During the downward compression of the cylindrical piston rod 4 from its midpoint, due to the piston rod's volume intruding into the damper sleeve 1 and the incompressibility of the fluid, the liquid in the liquid chamber, under pressure, flows through the compensation valve's flow hole I21, impacting the compression valve 3 and causing it to bend upwards. This allows the liquid to enter the compensation chamber, achieving volume compensation during the compression process. The specific process is as follows: Figure 1 As shown.

[0111] During the upward pulling process of the cylindrical piston rod 4 from the midpoint, due to the incompressibility of the piston rod volume being drawn out of the damper sleeve 1 and the liquid inside, the liquid in the built-in compensation chamber will flow through the compression valve flow hole II 31 under pressure, impacting the compensation valve 2 and causing it to bend upwards, thus allowing it to enter the liquid chamber, achieving volume compensation during the stretching process. The specific process is as follows: Figure 1 As shown.

[0112] This invention can also be used in magnetorheological dampers. If there is a need to adjust the output of damping force and there is enough space, a coil can be arranged at the thickened part of the lower end of the cylindrical piston rod 4, and the output of damping force can be adjusted by applying an excitation current.

[0113] See Figure 2 It mainly includes end cap I8, damper outer cylinder 9, magnetic yoke 10 with through hole S1, fixing bolt 6, compensation valve 2 with flow hole I21, compression valve 3 with flow hole II31, cylindrical piston rod 4, damper inner cylinder 11 with flow hole III111, end cap II12 and piston threaded connector 5.

[0114] The piston head of the cylindrical piston rod 4 and the inner cylinder 11 of the damper are in contact with a friction ring to prevent the magnetorheological fluid on both sides of the piston head from communicating and flowing with each other.

[0115] The opening pressure and orifice pressure of the cylindrical piston rod 4, the compensation valve 2 with flow orifice I 21, and the compression valve 3 with flow orifice II 31 are relatively small, and they only provide volume compensation for the damper and do not dominate the force output of the damper. The damping force output is jointly regulated by the damping channel between the magnetic yoke 10 and the outer cylinder 9 of the damper and the magnetic field generated by the magnetic yoke 10.

[0116] A flow hole IV101 is cut out inside the magnetic yoke 10 so that the magnetorheological fluid can enter the inner and outer cylinder channels through the magnetic yoke 10 and finally flow back to the inner cylinder 11 of the damper through the flow hole III111 on the inner cylinder 11 of the damper. The upper part of the magnetic yoke 10 is connected to the inner cylinder 11 of the damper by threads and sealed with thread sealant to ensure that the magnetorheological fluid will not enter the interior of the inner cylinder 11 of the damper through the gap.

[0117] The gap between the damper yoke 10 and the damper outer cylinder 9 is a damping channel, and the damping force output is controlled by applying an excitation current to the winding coil of the yoke 10.

[0118] During the process of the cylindrical piston rod 4 being pressed down from the midpoint, due to the piston rod volume intruding into the inner cylinder 9 and inner cylinder 11 of the damper and the incompressibility of the magnetorheological fluid, the magnetorheological fluid in the magnetorheological fluid cavity will flow through the flow hole I21 of the compensation valve 2 under pressure and impact the compression valve 3, causing it to bend upward, thereby allowing the magnetorheological fluid to enter the built-in compensation cavity, realizing the volume compensation of the cavity during the compression process.

[0119] During the upward pulling process of the cylindrical piston rod 4 from the midpoint, due to the incompressibility of the piston rod volume being drawn away from the outer cylinder 9 and inner cylinder 11 of the damper and the magnetorheological fluid, the magnetorheological fluid in the built-in compensation cavity will flow through the flow hole II 31 of the compression valve 3 under pressure, impacting the compensation valve 2 and causing it to bend upward, thereby allowing the magnetorheological fluid to enter the magnetorheological fluid cavity, realizing the volume compensation of the cavity during the stretching process.

[0120] Example 13:

[0121] The main structure of this embodiment is the same as any one of embodiments 1 to 12. Furthermore, the technical solution adopted by this invention is as follows: the volume compensation chamber of a traditional single-outlet magnetorheological damper is placed inside a cylindrical piston rod. A valve plate is arranged at the bottom of the piston rod to adjust the opening pressure of the damper during the recovery and compression strokes. Its main compensation structure includes a cylindrical piston rod, a recovery valve plate, and a compression valve plate. Because the large diameter of the cylindrical piston rod increases the volume compensation space, the rate of gas volume change when achieving the volume compensation function can be reduced, thus reducing the additional stiffness effect.

[0122] The piston rod has a hollow cylindrical structure with a through hole at the bottom. The valve plate is fixed to the inside and outside of the through hole by bolts and nuts to control the compression and recovery stroke compensation performance. See also Figure 3 The left side represents the compression stroke, and the right side represents the recovery stroke.

[0123] In this invention, the valve plate is used only for regulating the inflow and outflow of liquid in the compensation chamber, while the damping force output of the damper is achieved by setting different damping channels according to the structure, for example... Figure 3 The bottom of the piston rod is widened to form a damping channel with the cylinder wall, so as to realize the output of damping force during the compression and recovery strokes.

Claims

1. A cylindrical piston rod volume compensation structure for a damper, characterized in that: Includes a compensating valve (2), a compression valve (3), a cylindrical piston rod (4), a bolt (6), and a nut; The cylindrical piston rod (4) is a cylindrical structure that is hollow inside, closed at one end and open at the other end; the cylindrical wall of the cylindrical piston rod (4) is stepped, including a large diameter section and a small diameter section; the wall thickness of the large diameter section is greater than the wall thickness of the small diameter section, and the large diameter section is located on one side of the open end. The open end of the cylindrical piston rod (4) is provided with a compensation valve (2) and a compression valve (3). The compression valve (3) is located near the compensation chamber, which is the inner cavity of the cylindrical piston rod (4). The compensation valve (2) and the compression valve (3) are provided with through holes at their center positions. Bolts (6) pass through the through holes and are fixed by nuts so that the compensation valve (2) and the compression valve (3) are assembled on the cylindrical piston rod (4). The compensation valve (2) has several flow holes S1 spaced apart in the circumferential direction; The compression valve (3) is provided with a plurality of flow holes S2 spaced apart in the circumferential direction; The cylindrical piston rod volume compensation structure can be used in single-cylinder single-outlet rod dampers or double-cylinder magnetorheological dampers. When used in a single-cylinder single-outlet rod damper / double-cylinder magnetorheological damper, the cylindrical piston rod (4) is coaxially arranged in the cavity of the single-cylinder single-outlet rod damper sleeve / double-cylinder magnetorheological damper sleeve, and the compensation cavity of the cylindrical piston rod (4) is used as the volume compensation cavity of the single-cylinder single-outlet rod damper / double-cylinder magnetorheological damper. The compensation chamber of the cylindrical piston rod (4) is filled with gas, and the cavity of the single-cylinder single-outlet rod damper sleeve / double-cylinder magnetorheological damper sleeve is filled with liquid.

2. The cylindrical piston rod volume compensation structure for a damper according to claim 1, characterized in that: The distance between the through hole and the flow hole S1 on the compensation valve (2) is less than the distance between the through hole and the flow hole S2 on the compression valve (3).

3. The cylindrical piston rod volume compensation structure for a damper according to claim 1, characterized in that: When the cylinder piston rod (4) is pressed down, the liquid inside the sleeve and below the cylinder piston rod (4) flows through the compensation valve (2) under pressure and impacts the compression valve (3), causing the compression valve (3) to bend upward, thereby allowing the liquid to enter the compensation chamber and realize volume compensation during the compression process; When the cylindrical piston rod (4) is pulled up, the liquid in the compensation chamber flows through the compression valve (3) and the impact compensation valve (2) under pressure, causing the compensation valve (2) to bend downward, thereby allowing the liquid to enter the cavity below the cylindrical piston rod (4) to achieve volume compensation during the restoration process.

4. A cylindrical piston rod volume compensation structure for a damper according to claim 1 or 3, characterized in that: The internal air pressure change of the single-cylinder single-outlet rod damper / double-cylinder magnetorheological damper depends on the square of the ratio of the outer diameter to the inner diameter of the cylindrical piston rod (4).

5. A cylindrical piston rod volume compensation structure for a damper according to claim 1, characterized in that: The end face of the closed end of the cylindrical piston rod (4) is connected to a piston threaded connector (5).

6. A cylindrical piston rod volume compensation structure for a damper according to any one of claims 1 to 5, characterized in that: When the cylindrical piston rod volume compensation structure is used in a single-cylinder single-outlet rod damper, the single-cylinder single-outlet rod damper also includes a damper sleeve (1). The damper sleeve (1) is a cylindrical structure that is hollow inside, closed at both ends, and has a receiving hole I on one of the closed ends. The cylindrical piston rod (4) is coaxially arranged inside the damper sleeve (1), and the small diameter section of the cylindrical piston rod (4) passes through the receiving hole I, so that a damping channel I (7) is formed between the outer wall of the large diameter section of the cylindrical piston rod (4) and the inner wall of the damper sleeve (1). The large-diameter section of the cylindrical piston rod (4) divides the cavity of the damper sleeve (1) into the upper liquid chamber I and the lower liquid chamber I; The upper liquid chamber I and the lower liquid chamber I are connected through a damping channel I (7); The upper liquid chamber I is a cavity formed by the outer wall of the small diameter section of the cylindrical piston rod (4) and the inner wall of the damper sleeve (1); the lower liquid chamber I is a cavity formed by the compensation valve (2) and the inner wall of the damper sleeve (1); When the piston rod (4) is pressed down, the liquid in the lower liquid chamber I flows through the compensation valve (2) and impacts the compression valve (3) under pressure, causing the compression valve (3) to bend upward, thereby allowing the liquid to enter the compensation chamber and realize volume compensation during the compression process; When the cylinder piston rod (4) is pulled up, the liquid in the compensation chamber flows through the compression valve (3) and the impact compensation valve (2) under pressure, causing the compensation valve (2) to bend downward, thereby allowing the liquid to enter the lower liquid chamber I, thus realizing volume compensation during the restoration process.

7. A cylindrical piston rod volume compensation structure for a damper according to any one of claims 1 to 5, characterized in that: When the cylindrical piston rod volume compensation structure is used in a double-cylinder magnetorheological damper, the double-cylinder magnetorheological damper also includes end cap I (8), damper outer cylinder (9), magnetic circuit assembly, damper inner cylinder (11) and end cap II (12). The damper outer cylinder (9) is a hollow cylindrical structure with open ends. End cap I (8) and end cap II (12) are installed on the open ends on both sides respectively. The end cap II (12) has a receiving hole II in the center. The magnetic circuit assembly includes a yoke (10) and a coil wound on the yoke (10); The magnetic yoke (10) and the inner cylinder (11) of the damper are coaxially arranged in the outer cylinder (9) of the damper, so that the inner wall of the outer cylinder (9) of the damper forms a damping channel II and a flow channel cavity between the outer wall of the magnetic yoke (10) and the outer wall of the inner cylinder (11) of the damper, respectively. The damping channel II is connected to the flow channel cavity; The inner cylinder (11) of the damper is a cylindrical structure with a hollow interior, one open end and the other closed end, and the closed end is provided with a receiving hole III; the closed end of the inner cylinder (11) is attached to the end cap II (12), and the open end is connected to the magnetic yoke (10). The inner cylinder (11) of the damper has a flow hole S3 on the side of the cylinder wall near the end cap II (12) for connecting the cavity of the inner cylinder (11) of the damper and the flow channel cavity. One end of the magnetic yoke (10) is connected to the end cap I (8), and the other end is connected to the open end of the inner cylinder (11) of the damper; a flow hole S4 is provided in the center of the magnetic yoke (10), and the flow hole S4 is connected to the cavity of the inner cylinder (11) of the damper. The magnetic yoke (10) has a flow hole S5 on the side wall near the end cap I (8), and the flow hole S5 connects the damping channel II and the flow hole S4. The cylindrical piston rod (4) is coaxially arranged in the inner cylinder (11) of the damper, and the small diameter section of the cylindrical piston rod (4) passes through the receiving hole II and the receiving hole III; The large-diameter section of the cylindrical piston rod (4) divides the cavity of the inner cylinder (11) of the damper into the upper liquid chamber II and the lower liquid chamber II; The upper liquid chamber II is a cavity formed by the outer wall of the small diameter section of the cylindrical piston rod (4) and the inner wall of the inner cylinder (11) of the damper; the lower liquid chamber II is a cavity formed by the compensation valve (2), the inner wall of the inner cylinder (11) of the damper, and the flow hole S4 of the magnetic yoke (10). The upper liquid chamber II and the lower liquid chamber II are connected through the flow hole S5, the damping channel II, the flow channel cavity and the flow hole S3; When the piston rod (4) is pressed down, the liquid in the lower liquid chamber II flows through the compensation valve (2) and impacts the compression valve (3) under pressure, causing the compression valve (3) to bend upward, thereby allowing the liquid to enter the compensation chamber and realize volume compensation during the compression process; When the cylinder piston rod (4) is pulled up, the liquid in the compensation chamber flows through the compression valve (3) and the impact compensation valve (2) under pressure, causing the compensation valve (2) to bend downward, thereby allowing the liquid to enter the lower liquid chamber II, thus realizing volume compensation during the restoration process.

8. A cylindrical piston rod volume compensation structure for a damper according to claim 7, characterized in that: A friction ring is fitted on the outer wall of the large diameter section of the cylindrical piston rod (4). The friction ring contacts the inner wall of the damper inner cylinder (11) to prevent the liquid in the upper liquid chamber II and the lower liquid chamber II from flowing through the gap between the outer wall of the large diameter section of the cylindrical piston rod (4) and the inner wall of the damper inner cylinder (11).

9. A cylindrical piston rod volume compensation structure for a damper according to claim 7, characterized in that: The magnetic yoke (10) is connected to the inner cylinder of the damper (11) by threads and sealed with thread sealant.

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