CN219159423U

CN219159423U - Structure for preventing leakage of periphery of small gland in sealing element of double-circulation oil pressure damper

Info

Publication number: CN219159423U
Application number: CN202223189609.7U
Authority: CN
Inventors: 刘剑; 石世锋; 刘子威; 唐家栋
Original assignee: Zhuzhou Times Equipment Technology Co Ltd
Current assignee: Zhuzhou Times Equipment Technology Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-06-09
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a structure for preventing leakage of the periphery of a small gland in a sealing element of a double-circulation oil pressure shock absorber, which comprises a guide seat, a piston rod and the small gland, wherein the upper end surface of the guide seat is provided with an annular boss, the small gland is installed in the annular boss through matching of an external thread and an internal thread of the annular boss, an annular small gasket is arranged below the small gland, an L-shaped installation position formed by intersecting an annular inner side wall and a bottom plane is arranged on the inner side of the guide seat below the small gasket, a second sealing ring is arranged at the L-shaped installation position, a U-shaped groove with a downward opening is arranged on the bottom surface of the second sealing ring, an inner side pressing ring and an outer side pressing ring are respectively arranged on the inner side and the outer side of the U-shaped groove, the inner wall of the inner side pressing ring is pressed on the periphery of the piston rod, a gap is reserved between the bottom surface of the inner side pressing ring and the bottom plane of the L-shaped installation position, a first sealing rib is arranged on the bottom surface of the outer side pressing ring, and the first sealing rib is pressed by the guide seat. Through the arrangement, the problem of leakage of damping fluid from the periphery of the small gland can be prevented.

Description

Structure for preventing leakage of periphery of small gland in sealing element of double-circulation oil pressure damper

Technical Field

The utility model relates to a structure for preventing leakage of the periphery of a small gland in a sealing element of a double-circulation oil pressure damper, and belongs to the technical field of oil pressure dampers.

Background

The oil pressure shock absorber for the vehicle is used for reducing the suspension vibration of the vehicle, ensuring the safe and stable running of the railway vehicle on a line and improving the riding comfort of passengers. The oil pressure vibration damper can be divided into a single-cycle oil pressure vibration damper and a double-cycle oil pressure vibration damper according to the flow direction of oil when the vibration damper moves, the vibration damper with the same flow direction of oil when the vibration damper stretches and compresses is called a single-cycle vibration damper, and the vibration damper with different flow directions of oil when the vibration damper stretches and compresses is called a double-cycle vibration damper. A static seal is arranged between the upper end face of the outer oil cylinder sleeve of the shock absorber and the guide seat, and a dynamic seal is arranged between the guide seat and the piston rod, so that no leakage is ensured when the shock absorber moves. The quality guarantee period of the existing oil pressure shock absorber is higher and higher, leakage is not allowed in the maintenance period from delivery to next delivery, only one layer of dynamic seal is arranged between the guide seat and the piston rod of the double-circulation oil pressure shock absorber, and the oil leakage failure rate is high in the quality guarantee period.

Fig. 4 and 5 show a closed structure of a prior art double-circulation oil pressure damper, which relates to an outer cylinder liner 1, an inner cylinder liner 2, a piston rod 3, and the like. Specifically, a guide seat 4, a large gland 9, a small gland 10 and the like are arranged at the port part of the upper end of the double-circulation oil pressure shock absorber. The guide seat 4 is cylindrical, the center of the guide seat is provided with a first shaft hole, the upper end surface between the outer peripheral surface of the guide seat 4 and the first shaft hole is provided with an annular boss 401, and the inner wall of the annular boss 401 is provided with an internal thread; the center of the small gland 10 is provided with a shaft hole II, and the periphery of the small gland 10 is provided with external threads; the large gland 9 is annular, the periphery of the large gland is provided with external threads, and the inner wall of the upper end of the external cylinder sleeve 1 is provided with internal threads. The small gland 10 is screwed into the inner wall of the annular boss 401 through external threads on the periphery to be arranged in the annular boss 401, so that the small gland is fixedly connected with the guide seat 4. The large gland 9 is fixed in the port of the upper end part of the outer cylinder liner 1 through the matching of the external threads of the periphery and the internal threads of the outer cylinder liner 1, and meanwhile, the top end surface of the guide seat 4 outside the annular boss 401 is pressed at the upper end of the inner cylinder liner 2 through the large gasket 5, so that the guide seat 4 is fixed in the port of the outer cylinder liner 1 of the double-circulation oil pressure damper.

The first shaft hole of the guide seat 4 fixed in the port of the upper end part of the outer oil cylinder sleeve 1 is correspondingly communicated with the second shaft hole of the small gland 10, and the piston rod 3 is positioned in the first shaft hole and the second shaft hole. A first sealing ring 7 is arranged between the inner wall of the shaft hole II of the small gland 10 and the piston rod 3, and the first sealing ring 7 is a low-pressure sealing ring; an annular small gasket 6 is arranged below the small gland 10, and a second sealing ring 8 is arranged between the guide seat 4 below the small gasket 6 and the piston rod 3; an annular large gasket 5 is arranged between the lower part of the large gland 9 and the guide seat 4, and a sealing ring III 11 is arranged between the inner wall of the outer cylinder sleeve 1 under the large gasket 5 and the guide seat 4.

In addition, a guide ring 15 and a stoneley seal 14 (Gelai ring+O-shaped ring) are sequentially arranged downwards on the inner wall of the first shaft hole of the guide seat 4 below the second sealing ring 8, and the stoneley seal 14 is a first sealing piece for preventing damping fluid in the inner cylinder sleeve 2 from being carried upwards by the piston rod 3. However, it is difficult for the stoneley seal 14 to completely prevent the damping fluid from being carried up by the piston rod 3, so that a second seal ring 8 is required to achieve complete blocking.

An annular L-shaped mounting position 403 of a second sealing ring 8 with an L-shaped section, which is formed by an inner side wall 4032 and a bottom plane 4031, is formed on the inner side of the guide seat 4 below the annular small gasket 6; the bottom surface of sealing washer two 8 is located the basal plane 4031 of L shape installation position 403, and the outer peripheral face of sealing washer two 8 is laminated with the inside wall 4032 of L shape installation position 403, and the inside wall 4032 of sealing washer two 8 is laminated and is pressed on piston rod 3, makes sealed between guide holder 4 and the piston rod 3, and sealing washer two 8 top surfaces are laminated with the interior half 601 of the lower bottom surface of gasket 6 mutually, and the outer half 602 of the lower bottom surface of gasket 6 is then laminated and is pressed on the top surface 402 that guide holder 4 is located annular boss 401 inboard. The bottom surface of the second sealing ring 8 is provided with a U-shaped groove 801 with a downward opening, the lower part of the second sealing ring 8 is divided into an inner pressing ring 802 and an outer pressing ring 803, the inner wall of the inner pressing ring 802 is provided with an annular convex rib 806, the annular convex rib 806 is always hooped on the periphery of the piston rod 3 by the inner pressing ring 802, and damping fluid in the inner cylinder sleeve 2 is prevented from being upwards carried out by the piston rod 3.

The closed structure of the dual-cycle oil pressure damper of the prior art has the defect that after a period of use, the oil seepage damping fluid phenomenon exists between the gaps of the periphery of the small gland 10 and the inner wall screw thread of the annular boss 401. For this phenomenon, we have found two cases that lead to this phenomenon through multiple disassembly tests and studies, including: firstly, damping fluid leaks to a gap between the periphery of the small gland 10 and the inner wall of the annular boss 401 in a threaded fit manner through the space between the outer half surface 602 of the lower bottom surface of the small gasket 6 and the top surface 402 of the guide seat 4 positioned on the inner side of the annular boss 401; second, there is leakage of damping fluid between the upper surface of the small gasket 6 and the lower bottom surface of the small gland 10 to the gap where the periphery of the small gland 10 is in threaded fit with the inner wall of the annular boss 401.

The first situation occurs because the second seal ring 8 is not tightly compressed, and the damping fluid flows between the outer half 602 of the lower bottom surface of the small gasket 6 and the top surface 402 of the guide seat 4 located inside the annular boss 401 through the gap between the outer pressure ring 803 of the second seal ring 8 and the guide seat 4.

The second situation occurs because the second sealing ring 8 is compressed too tightly, so that the bottom surface of the inner pressing ring 802 of the second sealing ring 8 is pressed against the guide seat 4, after the annular convex rib 806 is worn by the piston rod 3 which is continuously drawn, the inner pressing ring 802 cannot shrink and tightly adhere to the piston rod 3, so that the damping fluid moves upward along with the piston rod 3, and after the second sealing ring 8 is blocked, leakage occurs between the upper surface of the steering gasket 6 and the lower bottom surface of the small gland 10.

To prevent the leakage, the following measures are required.

Disclosure of Invention

The utility model aims to solve the technical problems that: how to solve the problem of outward oil seepage (damping fluid) between the gaps of the screw thread fit of the periphery of the small gland and the inner wall of the annular boss.

Aiming at the problems, the technical scheme provided by the utility model is as follows:

the utility model provides a prevent structure of little gland periphery seepage in dual cycle oil pressure shock absorber sealing member, including the guide holder, piston rod and little gland, the guide holder up end has annular boss, little gland passes through the internal thread cooperation of external screw thread and annular boss and installs in annular boss, be equipped with annular little gasket under little gland, the guide holder inboard of gasket below is equipped with the L shape installation position that constitutes by annular inside wall and bottom plane intersection, be equipped with sealing washer two at L shape installation position, the bottom surface of ring seal two has the U type groove of opening decurrent, the inside and outside in U type groove are inboard clamping ring and outside clamping ring respectively, the inner wall subsides of inboard clamping ring is pressed at the piston rod periphery, there is the clearance between the bottom surface of inboard clamping ring and the bottom plane of L shape installation position, be equipped with close pressure bead one in the bottom surface of outside clamping ring, close pressure bead one is compressed tightly by the guide holder.

Further, a second sealing rib is arranged on the top surface of the second outer side of the sealing ring where the outer side pressing ring is located, and the second sealing rib is pressed by the small gasket.

Further, the number of the lower compaction bead I and the upper compaction bead II is two respectively.

Further, a sealing ring IV is arranged between the outer half surface of the lower bottom surface of the small gasket and the top surface of the inner side of the annular boss of the guide seat.

Further, a seal ring five is arranged between the small gasket and the small gland.

The beneficial effects are that: the phenomenon of outward oil seepage between the gaps of the periphery of the small gland and the inner wall screw thread fit of the annular boss can be thoroughly avoided; the leakage-proof pressure of the sealing ring can be relieved.

Drawings

FIG. 1 is a schematic cross-sectional view of a structure for preventing leakage from the periphery of a small gland in a seal for a dual cycle hydraulic shock absorber according to the present utility model;

FIG. 2 is a partial schematic view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the second seal ring;

FIG. 4 is a schematic cross-sectional view of a prior art dual cycle oil pressure damper seal;

fig. 5 is a partial schematic view of fig. 4.

In the figure: 1. an outer cylinder sleeve; 2. an inner oil cylinder sleeve; 3. a piston rod; 4. a guide seat; 401. an annular boss; 402. a top surface; 403. an L-shaped mounting position; 403. 1 a bottom plane; 4032. an inner sidewall; 5. a large gasket; 6. a small gasket; 601. an inner half surface; 602. an outer half face; 7. a first sealing ring; 8. a second sealing ring; 801. a U-shaped groove; 802. an inner pressing ring; 803. an outer pressing ring; 804. the first dense pressing convex edge is; 805. a second dense pressing rib; 806. annular rib; 9. a large gland; 10. a small gland; 11. a third sealing ring; 12. a sealing ring IV; 13. a fifth sealing ring; 14. a stoneley seal; 15. a guide ring.

Detailed Description

The utility model is further described below with reference to examples and figures:

as shown in fig. 1-3, a structure for preventing leakage of the periphery of a small gland in a sealing member of a dual-circulation oil pressure shock absorber comprises a guide seat 4, a piston rod 3 and a small gland 10, wherein an annular boss 401 is arranged on the upper end face of the guide seat 4, the small gland 10 is installed in the annular boss 401 through matching of external threads and internal threads of the annular boss 401, an annular small gasket 6 is arranged under the small gland 10, an L-shaped installation position 403 formed by intersecting an annular inner side wall 4032 and a bottom plane 4031 is arranged on the inner side of the guide seat 4 under the small gasket 6, a sealing ring II 8 is arranged on the L-shaped installation position 403, a U-shaped groove 801 with an opening downwards is arranged on the bottom face of the sealing ring II 8, an inner side pressing ring 802 and an outer side pressing ring 803 are respectively arranged on the inner side and the outer side of the U-shaped groove 803, a gap is reserved between the bottom face of the inner side pressing ring 802 and the bottom plane 4031 of the L-shaped installation position 403, a sealing rib 804 is arranged on the bottom face of the outer side pressing ring 803, and the sealing rib 804 is pressed by the guide seat 4. A gap is formed between the bottom surface of the inner pressing ring 802 and the bottom surface 4031 of the L-shaped mounting position 403, and after the annular rib 806 is worn by the piston rod 3 which is continuously drawn, the inner pressing ring 802 can automatically contract and cling to the piston rod 3 by virtue of elasticity, so that damping fluid cannot pass between the annular rib 806 and the outer circumferential surface of the piston rod 3. The bottom surface of the outer pressing ring 803 is provided with a first sealing rib 804, the first sealing rib 804 is pressed by the guide seat 4, so that damping fluid reaching the U-shaped groove 801 is prevented from seeping from a gap between the outer pressing ring 803 and the guide seat 4, and therefore, no damping fluid seeps between the outer half surface 602 of the lower bottom surface of the small gasket 6 and the top surface 402 of the guide seat 4, which is positioned inside the annular boss 401. Since the annular rib 806 can automatically contract and cling to the piston rod 3, damping fluid cannot pass between the annular rib 806 and the outer peripheral surface of the piston rod 3, and no damping fluid can flow between the upper surface of the small gasket 6 and the lower bottom surface of the small gland 10. Through the arrangement, the phenomenon of outward oil seepage damping fluid between the gaps of the periphery of the small gland 10 and the inner wall of the annular boss 401 in threaded fit is avoided.

The top surface of the outer side of the second sealing ring 8 where the outer side pressing ring 803 is arranged is provided with a second sealing rib 805, and the second sealing rib 805 is pressed by the small gasket 6. This is to prevent seepage of the first sealing rib 804 below, and prevent backflow of seepage damping fluid to the piston rod 3 via the top surface of the outer side of the second sealing ring 8 and the inner half 601 of the lower bottom surface of the small gasket 6.

The two

pressing ribs

804 and 805 can be used to balance the stress.

Further, a fourth sealing ring 12 is arranged between the outer half surface 602 of the lower bottom surface of the small gasket 6 and the top surface 402 of the guide seat 4, which is positioned inside the annular boss 401. In this way, if seepage occurs in the first sealing rib 804 below, the seepage can be prevented from leaking outwards between the outer half surface 602 of the lower bottom surface of the small gasket 6 and the top surface 402 of the guide seat 4 positioned inside the annular boss 401, and the gap between the periphery of the small gland 10 and the inner wall of the annular boss 401 in a threaded fit manner.

Further, a seal ring five 13 is provided between the small gasket 6 and the small gland 10. In order to prevent the damping fluid from ascending between the annular rib 806 and the outer circumferential surface of the piston rod 3, the fifth seal ring 13 can prevent the damping fluid from leaking outwards through the gap between the upper surface of the small gasket 6 and the lower bottom surface of the small gland 10, which is in threaded fit with the outer circumference of the small gland 10 and the inner wall of the annular boss 401.

The above embodiments are merely illustrative of the present utility model and several improvements or modifications, which can be made by others without departing from the principles of the present utility model, should be considered as falling within the scope of the present utility model.

Claims

1. The utility model provides a prevent structure of little gland periphery seepage in dual cycle oil pressure shock absorber sealing member, including guide holder (4), piston rod (3) and little gland (10), guide holder (4) up end has annular boss (401), little gland (10) are installed through the internal thread cooperation of external screw thread and annular boss (401), annular little gasket (6) have been set up under little gland (10), guide holder (4) inboard below little gasket (6), be equipped with L shape installation position (403) that constitute by annular inside wall (4032) and basal plane (4031) intersection, be equipped with sealing washer two (8) at L shape installation position (403), the bottom surface of annular sealing washer two (8) has opening decurrent U type groove (801), the inside and outside of U type groove (801) are inboard clamping ring (802) and outside clamping ring (803) respectively, the inner wall subsides of inboard clamping ring (802) are pressed at piston rod (3) periphery, its characterized in that: a gap is reserved between the bottom surface of the inner pressing ring (802) and the bottom surface (4031) of the L-shaped mounting position (403), a first pressing convex rib (804) is arranged on the bottom surface of the outer pressing ring (803), and the first pressing convex rib (804) is pressed by the guide seat (4).

2. The structure for preventing leakage of the periphery of a small gland in a seal of a dual cycle oil pressure damper according to claim 1, wherein: the top surface of the outer side of the second sealing ring (8) where the outer side pressing ring (803) is positioned is provided with a second sealing convex rib (805), and the second sealing convex rib (805) is pressed by the small gasket (6).

3. The structure for preventing leakage of the periphery of a small gland in a seal of a dual cycle oil pressure damper according to claim 2, wherein: the number of the lower compaction bead I (804) and the upper compaction bead II (805) is two respectively.

4. The structure for preventing leakage of the periphery of a small gland in a seal of a dual cycle oil pressure damper according to claim 1, wherein: a sealing ring IV (12) is arranged between the outer half surface (602) of the lower bottom surface of the small gasket (6) and the top surface (402) of the guide seat (4) positioned at the inner side of the annular boss (401).

5. The structure for preventing leakage of the periphery of a small gland in a seal of a dual cycle oil pressure damper according to claim 1, wherein: a seal ring five (13) is arranged between the small gasket (6) and the small gland (10).