CN112196932A - Throttle valve for buffer - Google Patents
Throttle valve for buffer Download PDFInfo
- Publication number
- CN112196932A CN112196932A CN202011028759.2A CN202011028759A CN112196932A CN 112196932 A CN112196932 A CN 112196932A CN 202011028759 A CN202011028759 A CN 202011028759A CN 112196932 A CN112196932 A CN 112196932A
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- Prior art keywords
- valve
- valve seat
- side wall
- circle
- annular
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/58—Arrangements or adaptations of shock-absorbers or springs
- B64C25/60—Oleo legs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention belongs to the technical field of structural design of helicopters, and discloses a throttle valve for a buffer, which comprises: valve pin, valve seat, valve barrel, big spring, valve cover, little spring, outer retaining ring and interior retaining ring. The valve seat is of an H-shaped tubular structure, a group of oil holes are distributed in an annular mode at the position, close to the side wall, of the middle partition plate, a small hole is formed in the center of the middle partition plate, and a circle of annular holes are formed in the side wall of the upper cavity of the valve seat; a group of valve pins are arranged in the holes at the upper part of the valve seat; the valve sleeve is provided with an annular groove on the middle side wall of the inner circle, 1 group of oil holes are arranged in the middle of the groove, the inner circle of the valve sleeve is assembled on the excircle of the middle upper part of the valve seat, the large spring is assembled on the excircle of the lower part of the valve seat, the upper part of the large spring is attached to the lower end face of the valve sleeve, the outer retaining ring is assembled on the lower part of the valve seat, the upper end face of the outer retaining ring is in contact with the lower end face of the large spring, the large spring is compressed, the valve cover is inversely assembled in the lower cavity of the. The throttle valve is suitable for buffers with different landing speed requirements.
Description
Technical Field
The invention belongs to the technical field of structural design of helicopters, and particularly relates to a throttle valve for a buffer.
Background
A throttling valve for a buffer is used for an undercarriage buffer, and the requirement that the buffer is suitable for different landing speeds can be met by adjusting the size of a damping hole according to the oil pressure in the buffer.
The defects of the background art are as follows:
the existing throttle valve for the buffer usually adopts a fixed oil hole or an oil needle structure, is usually suitable for the design of the buffer with constant landing speed, has larger landing speed span (more than 0.5 m/s-12.8 m/s) for helicopters, particularly crash-resistant undercarriages, adopts the multi-stage buffers in series to meet the requirements of normal landing and crash resistance, and has more complex structure and higher weight cost.
Disclosure of Invention
The purpose of the invention is as follows: a throttle valve for a buffer is provided which is adaptable to different landing speed requirements.
The technical scheme of the invention is as follows:
a throttle valve for a damper, comprising: the valve comprises a valve pin, a valve seat, a valve sleeve, a large spring, a valve cover, a small spring, an outer retainer ring and an inner retainer ring;
the valve seat is of an H-shaped tubular structure and is divided into an upper cavity and a lower cavity by a central partition plate; a circle of annular first oil holes are axially formed in the periphery of the central partition plate close to the side wall;
the upper end of the valve seat is connected with the upper end of a buffer piston rod;
the outer side wall of the upper end of the valve seat is provided with a ring-shaped boss; the annular boss is provided with a group of first through holes along the axial direction;
the valve pins are of T-shaped cylindrical structures, and a group of valve pins are arranged in the first through hole from top to bottom;
the valve sleeve is of a tubular structure and is sleeved on the outer side wall of the upper cavity of the valve seat;
the outer retainer ring is of a tubular structure and is sleeved at the bottom of the valve seat;
the large spring is sleeved on the outer side wall of the valve seat and between the valve sleeve and the outer retainer ring;
the valve cover is of a U-shaped annular structure and is inversely assembled in the lower cavity of the valve seat;
the small retainer ring is of a tubular structure and is arranged at the bottom end inside the lower cavity of the valve seat,
the small spring is arranged between the small retainer ring and the bottom of the valve cover.
Furthermore, a circle of second oil holes are formed in the side wall of the upper cavity of the valve seat along the radial direction.
Furthermore, a circle of annular groove is formed in the inner side wall of the valve sleeve; and a circle of third oil holes matched with the second oil holes are radially arranged in the annular groove. The valve sleeve is mainly used for increasing the area of the damping hole and reducing the damping force after the valve sleeve moves downwards under the action of oil pressure through the valve pin and the compression spring moves downwards.
Further, a second through hole is formed in the center of the central partition plate of the valve seat, and the area of the second through hole is not more than 30% of the total area of the circle of the first oil holes. The buffer has the main effects that the buffer is used as a rebound fixed oil hole, provides larger damping for the rebound of the buffer, and prevents the buffer from having the phenomenon of higher rebound speed.
Furthermore, a third through hole is formed in the center of the bottom of the valve cover, and the diameter of the third through hole is smaller than the difference value between the diameter of a circle formed by the circle centers of the circle of the annular first oil holes and the diameter of the first oil holes.
Further, the diameter of the third through hole is larger than that of the second through hole. When guaranteeing that third oilhole and second oilhole coincide, fluid can pass through the second oilhole completely.
Further, an annular flange edge is arranged on the outer side wall of the upper end of the valve sleeve; the upper end face of the annular flange is in contact with the lower end face of the annular boss of the valve seat, and the upper end face of the annular flange is also in contact with the bottom end face of the valve pin.
Furthermore, the side wall of the lower end of the valve seat is provided with a pin along the radial direction for fixing the outer retainer ring and the inner retainer ring.
The invention has the beneficial effects that:
the invention has simple and compact structure, can meet the damping requirements of the buffer at different landing speeds, can improve the buffering performance of the buffer and reduce the structural complexity of the buffer.
Drawings
FIG. 1 is a schematic view of a throttle valve for a damper;
FIG. 2 is a schematic diagram of a positive stroke, low speed operation of the throttle valve;
FIG. 3 is a schematic diagram of the positive stroke high speed operation of the throttle valve;
FIG. 4 is a schematic diagram of reverse throttle operation;
description of numbering: 1 valve pin, 2 valve seats, 3 valve sleeves, 4 large springs, 5 valve covers, 6 small springs, 7 outer check rings and 8 inner check rings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural composition diagram of the invention, and the throttle valve comprises a valve pin 1, a valve seat 2, a valve sleeve 3, a large spring 4, a valve cover 5, a small spring 6, an outer retainer 7, an inner retainer 8 and the like. The valve seat 2 is in an H-shaped tubular structure, a group of oil holes are distributed in an annular mode at the position, close to the side wall, of the middle partition plate, a small hole is formed in the center of the middle partition plate, and a circle of annular holes are formed in the side wall of the upper cavity of the valve seat; the valve seat 2 is connected with the upper end of a piston rod of the buffer to divide the buffer into two oil cavities; the tail of the valve pin 1 is of a T-shaped cylindrical structure, and a group of valve pins 1 are arranged in holes in the upper part of the valve seat 2; the valve bush 3 is of a T-shaped tubular structure, the side wall of the middle of an inner circle is provided with an annular groove, the middle of the groove is provided with 1 group of oil holes, the inner circle of the valve bush 3 is assembled on the excircle of the middle upper part of the valve seat 2, and the upper part of the valve bush 3 is respectively contacted with the upper and lower end surfaces of the valve seat and the end surface of the valve pin 1; big spring 4 assembles on the lower part excircle of disk seat 2, and the terminal surface laminating under 3 upper portions of big spring and the valve barrel 3, outer retainer ring assembly in the lower part of disk seat, the terminal surface contact under up end and the big spring 3, compresses big spring 4, and valve cover 5 is "U" type annular structure, and the hole is dug at the center, and the assembly is invertedly at disk seat 2 lower part intracavity, and little spring 6 assembles inside in the valve gap, and the lower extreme passes through little retainer ring 6 to be fixed in the cavity of 2 lower parts of disk seat.
FIG. 2 is the normal stroke small speed working principle of the present invention, the oil pressure in the oil chamber can only overcome the acting force of the small spring 6 to open the valve cover 5, at this time, the oil hole in the center of the valve seat 2 is completely opened, and the oil enters the oil return chamber through the damping hole to generate the damping force; FIG. 3 is a positive stroke high speed working principle of the present invention, the oil pressure in the oil chamber can overcome the acting force of the small spring 6 to open the valve cover 5, meanwhile, the oil pressure acts on the valve sleeve 3 through the valve pin 1, the oil hole in the middle of the side wall of the valve sleeve 3 and the damping hole in the side wall of the valve seat 2 are combined with each other by overcoming the acting force of the large spring 4, and the oil in the oil chamber enters the oil return chamber through the central damping hole and the side wall damping of the valve seat 2 to generate; FIG. 4 shows the reverse stroke working principle of the present invention, the upper part of the valve sleeve 3 is attached to the end surface of the valve seat 2 under the pressure of the oil return chamber and the acting force of the large spring 4, the oil hole on the side wall of the valve seat 2 is closed, the upper part of the valve cover 5 is attached to the middle end surface of the valve seat 2 under the pressure of the oil return chamber and the acting force of the large spring 4, the oil hole at the center of the valve seat 2 close to the side wall, the center oil hole of the valve cover 5 coincides with the center small oil hole of the valve seat 2, and at this time.
The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A throttle valve for a buffer is characterized in that: the throttle valve includes: the valve comprises a valve pin, a valve seat, a valve sleeve, a large spring, a valve cover, a small spring, an outer retainer ring and an inner retainer ring;
the valve seat is of an H-shaped tubular structure and is divided into an upper cavity and a lower cavity by a central partition plate; a circle of annular first oil holes are axially formed in the periphery of the central partition plate close to the side wall;
the upper end of the valve seat is connected with the upper end of a buffer piston rod;
the outer side wall of the upper end of the valve seat is provided with a ring-shaped boss; the annular boss is provided with a group of first through holes along the axial direction;
the valve pins are of T-shaped cylindrical structures, and a group of valve pins are arranged in the first through hole from top to bottom;
the valve sleeve is of a tubular structure and is sleeved on the outer side wall of the upper cavity of the valve seat;
the outer retainer ring is of a tubular structure and is sleeved at the bottom of the valve seat;
the large spring is sleeved on the outer side wall of the valve seat and between the valve sleeve and the outer retainer ring;
the valve cover is of a U-shaped annular structure and is inversely assembled in the lower cavity of the valve seat;
the small retainer ring is of a tubular structure and is arranged at the bottom end inside the lower cavity of the valve seat,
the small spring is arranged between the small retainer ring and the bottom of the valve cover.
2. The throttle valve for a shock absorber according to claim 1, wherein: and a circle of second oil holes are formed in the side wall of the upper cavity of the valve seat along the radial direction.
3. The throttle valve for a shock absorber according to claim 2, wherein: the inner side wall of the valve sleeve is provided with a circle of annular grooves; and a circle of third oil holes matched with the second oil holes are radially arranged in the annular groove.
4. The throttle valve for a shock absorber according to claim 2, wherein: and a second through hole is formed in the center of the central partition plate of the valve seat, and the area of the second through hole is not more than 30% of the total area of the circle of the first oil holes.
5. The throttle valve for a shock absorber according to claim 4, wherein: and a third through hole is formed in the center of the bottom of the valve cover, and the diameter of the third through hole is smaller than the difference value between the diameter of a circle formed by the circle centers of the circle of the annular first oil holes and the diameter of the first oil holes.
6. The throttle valve for a shock absorber according to claim 5, wherein: the diameter of the third through hole is larger than that of the second through hole.
7. The throttle valve for a shock absorber according to claim 6, wherein: the outer side wall of the upper end of the valve sleeve is provided with an annular flange edge; the upper end face of the annular flange is in contact with the lower end face of the annular boss of the valve seat, and the upper end face of the annular flange is also in contact with the bottom end face of the valve pin.
8. The throttle valve for a shock absorber according to claim 7, wherein: and the side wall of the lower end of the valve seat is radially provided with a pin for fixing the outer check ring and the inner check ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028759.2A CN112196932B (en) | 2020-09-25 | 2020-09-25 | Throttle valve for buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028759.2A CN112196932B (en) | 2020-09-25 | 2020-09-25 | Throttle valve for buffer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112196932A true CN112196932A (en) | 2021-01-08 |
| CN112196932B CN112196932B (en) | 2022-04-22 |
Family
ID=74008431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011028759.2A Active CN112196932B (en) | 2020-09-25 | 2020-09-25 | Throttle valve for buffer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112196932B (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1563273A (en) * | 1976-02-04 | 1980-03-26 | Messier Hispano Sa | Shock absorber |
| DE4406918A1 (en) * | 1993-03-18 | 1994-09-22 | Fichtel & Sachs Ag | Damping valve device |
| US5409088A (en) * | 1991-04-12 | 1995-04-25 | Yamaha Hatsudoki Kabushiki Kaisha | Shock absorber |
| JP2000225823A (en) * | 1999-02-04 | 2000-08-15 | Kayaba Ind Co Ltd | Loading amount sensitive type hydraulic buffer |
| CN1601138A (en) * | 2003-09-27 | 2005-03-30 | 吕崇耀 | Method for changing hydraulic overflow in large flux into buffered throttle |
| CN101016926A (en) * | 2007-02-06 | 2007-08-15 | 南京航空航天大学 | Undercarriage bumper having inner flow regulating valve |
| FR2902850A1 (en) * | 2006-06-21 | 2007-12-28 | Soben Soc Par Actions Simplifi | Hydraulic end-stop device for adjustable shock absorber of e.g. helicopter, has outer tube integrated with actuator arranged outside body, and including openings mapped with openings of inner tube so that fluid rapidly flows via openings |
| CN102138024A (en) * | 2008-09-01 | 2011-07-27 | Zf腓特烈港股份公司 | Adjustable damping valve |
| CN102562915A (en) * | 2010-12-30 | 2012-07-11 | 杨洁 | Self-adaptive damping adjustment diverter valve of self-adaptive variable damper shock absorber |
| JP2012140981A (en) * | 2010-12-28 | 2012-07-26 | Hitachi Automotive Systems Ltd | Damping force adjusting-type shock absorber |
| KR101398755B1 (en) * | 2013-05-16 | 2014-05-27 | 주식회사 만도 | Variable hydraulic stopping damper |
| CN203670326U (en) * | 2013-12-18 | 2014-06-25 | 常德中联重科液压有限公司 | Overflow valve of oily function is mended in area |
| CN105626764A (en) * | 2014-10-27 | 2016-06-01 | 蒋磊 | Method for buffering undercarriage by mixing rubber and spring |
| CN105782324A (en) * | 2016-04-28 | 2016-07-20 | 广州汽车集团股份有限公司 | Solenoid valve assembly externally arranged on absorber and absorber |
| CN107143604A (en) * | 2017-06-29 | 2017-09-08 | 黄永宁 | Damper from main inlet control valve and its staged method of discharge |
| CN110701234A (en) * | 2019-10-22 | 2020-01-17 | 中国北方车辆研究所 | Shock acceleration sensitive valve for shock absorber |
-
2020
- 2020-09-25 CN CN202011028759.2A patent/CN112196932B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1563273A (en) * | 1976-02-04 | 1980-03-26 | Messier Hispano Sa | Shock absorber |
| US5409088A (en) * | 1991-04-12 | 1995-04-25 | Yamaha Hatsudoki Kabushiki Kaisha | Shock absorber |
| DE4406918A1 (en) * | 1993-03-18 | 1994-09-22 | Fichtel & Sachs Ag | Damping valve device |
| JP2000225823A (en) * | 1999-02-04 | 2000-08-15 | Kayaba Ind Co Ltd | Loading amount sensitive type hydraulic buffer |
| CN1601138A (en) * | 2003-09-27 | 2005-03-30 | 吕崇耀 | Method for changing hydraulic overflow in large flux into buffered throttle |
| FR2902850A1 (en) * | 2006-06-21 | 2007-12-28 | Soben Soc Par Actions Simplifi | Hydraulic end-stop device for adjustable shock absorber of e.g. helicopter, has outer tube integrated with actuator arranged outside body, and including openings mapped with openings of inner tube so that fluid rapidly flows via openings |
| CN101016926A (en) * | 2007-02-06 | 2007-08-15 | 南京航空航天大学 | Undercarriage bumper having inner flow regulating valve |
| CN102138024A (en) * | 2008-09-01 | 2011-07-27 | Zf腓特烈港股份公司 | Adjustable damping valve |
| JP2012140981A (en) * | 2010-12-28 | 2012-07-26 | Hitachi Automotive Systems Ltd | Damping force adjusting-type shock absorber |
| CN102562915A (en) * | 2010-12-30 | 2012-07-11 | 杨洁 | Self-adaptive damping adjustment diverter valve of self-adaptive variable damper shock absorber |
| KR101398755B1 (en) * | 2013-05-16 | 2014-05-27 | 주식회사 만도 | Variable hydraulic stopping damper |
| CN203670326U (en) * | 2013-12-18 | 2014-06-25 | 常德中联重科液压有限公司 | Overflow valve of oily function is mended in area |
| CN105626764A (en) * | 2014-10-27 | 2016-06-01 | 蒋磊 | Method for buffering undercarriage by mixing rubber and spring |
| CN105782324A (en) * | 2016-04-28 | 2016-07-20 | 广州汽车集团股份有限公司 | Solenoid valve assembly externally arranged on absorber and absorber |
| CN107143604A (en) * | 2017-06-29 | 2017-09-08 | 黄永宁 | Damper from main inlet control valve and its staged method of discharge |
| CN110701234A (en) * | 2019-10-22 | 2020-01-17 | 中国北方车辆研究所 | Shock acceleration sensitive valve for shock absorber |
Non-Patent Citations (1)
| Title |
|---|
| 刘向尧等: "国内中小型无人机起落缓冲装置的研究现状与展望", 《贵州农机化》 * |
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| Publication number | Publication date |
|---|---|
| CN112196932B (en) | 2022-04-22 |
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