CN105673931A - Piston for avoiding clamping stagnation - Google Patents

Piston for avoiding clamping stagnation Download PDF

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Publication number
CN105673931A
CN105673931A CN201610210304.XA CN201610210304A CN105673931A CN 105673931 A CN105673931 A CN 105673931A CN 201610210304 A CN201610210304 A CN 201610210304A CN 105673931 A CN105673931 A CN 105673931A
Authority
CN
China
Prior art keywords
piston
cylindrical
external diameter
clamping stagnation
outer diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610210304.XA
Other languages
Chinese (zh)
Inventor
余红波
琚永光
白永刚
马宗宇
王康恋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Long Gong (shanghai) Precision Hydraulic Co Ltd
Original Assignee
Long Gong (shanghai) Precision Hydraulic Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Long Gong (shanghai) Precision Hydraulic Co Ltd filed Critical Long Gong (shanghai) Precision Hydraulic Co Ltd
Priority to CN201610210304.XA priority Critical patent/CN105673931A/en
Publication of CN105673931A publication Critical patent/CN105673931A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K51/00Other details not peculiar to particular types of valves or cut-off apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J1/00Pistons; Trunk pistons; Plungers

Abstract

The invention provides a piston for avoiding clamping stagnation. The piston is characterized by comprising a first part, a second part and a third part which are successively arranged from top to bottom, wherein the first part and the second part are in a cylindrical shape, the top surface of the third part is in a circular shape, the outer diameter of the third part is greater than the outer diameter of the first part, the outer diameter of the first part is greater than the outer diameter of the second part, and the side surface of the second part is transitioned to the top surface of the third part in a rounding manner. An outer circular groove for installing a round wire snap ring is canceled, one second cylindrical part and one third cylindrical part are added on the basis of the outer cylindrical surface of the traditional piston, and the side surface of the second cylindrical part is transitioned to the top surface of the third cylindrical part in a rounding manner. The piston is simple in structure, long in service life, and capable of better solving the clamping stagnation situation of the piston, reducing the after-sale maintenance expense of a pilot control valve, and improving the application efficiency and application quality of a hydraulic pilot control system of a whole machine.

Description

A kind of piston avoiding clamping stagnation
Technical field
The present invention relates to a kind of piston avoiding clamping stagnation, belong to pilot-actuated valve design of part technical field.
Background technology
Pilot-actuated valve is mainly used in the pilot hydraulic control system of small type hydraulic excavator and other engineering machinery, is the important component part of pilot control system. In pilot hydraulic control system, pilot-actuated valve working solution force feed is provided by guide's delivery valve, by controlling pilot-actuated valve, pilot control hydraulic oil acts on corresponding main valve and controls connection, main valve is driven to control connection valve core movement, implement the corresponding action of executive component, thus meeting the action request to executive component of operator. Piston assembly is one of important ingredient of pilot-actuated valve.
As shown in Figure 1, piston assembly in the market, when piston relies on spring compression force to reset, in order to limit the position of piston movement, piston is provided with the cylindrical groove 1-1 of equipped certain specification elastic spring, utilizes elastic spring to simultaneously act on piston seat and piston realizes restriction piston movement position. Owing to piston seat material hardness is relatively low, elastic spring hardness is higher, after pilot-actuated valve long-term work, piston seat inner conical surface is deformed by elastic spring impact force, inner conical surface intersects seamed edge internal diameter with interior cylinder and tapers into, when seamed edge contacts with outside piston cylinder, frictional force during piston reset is caused to become larger, when frictional force is more than spring compression force, piston will reset thus there is clamping stagnation, cause that pilot-actuated valve cannot operate, it is impossible to meet the action request to executive component of operator.
Summary of the invention
The technical problem to be solved there is provided the piston avoiding clamping stagnation of a kind of simple in construction and long service life, the problem solving pilot control valve piston clamping stagnation.
In order to solve above-mentioned technical problem, the invention provides a kind of piston avoiding clamping stagnation, it is characterized in that, being cylindrical including the Part I set gradually from top to bottom, Part II and Part III, Part I and Part II, the end face of Part III is circular, its external diameter is more than the external diameter of Part I, the external diameter of Part I is more than the external diameter of Part II, wherein, adopts rounding transition between side and the end face of Part III of Part II.
Preferably, described Part III is cylindrical.
Preferably, the upside of described Part I is provided with hemisphere portion, reverse frustoconic part it is provided with between described Part I and Part II, the external diameter of the end face of reverse frustoconic part is equal with the external diameter of Part I, the external diameter of the bottom surface of reverse frustoconic part is equal with the external diameter of Part II, and described hemisphere portion, Part I, reverse frustoconic part, Part II and Part III are one-body molded.
Compared with prior art, the invention has the beneficial effects as follows:
Present invention eliminates dress elastic spring cylindrical groove, the basis of the external cylindrical surface of traditional piston adds second cylindrical part and third cylindrical section is divided, between the end face that the side of the second cylindrical part and third cylindrical section are divided, adopt rounding transition. Present configuration is simple, long service life, can solve the situation of piston clamping stagnation better, reduces pilot-actuated valve valve after-sales service expense, improves the service efficiency of complete machine Hydraulic guide control system and uses quality.
Accompanying drawing explanation
Fig. 1 is conventional piston structural representation;
Fig. 2 is a kind of piston structure schematic diagram avoiding clamping stagnation;
Fig. 3 is the close-up schematic view of I in Fig. 2;
Fig. 4 is piston assembly sectional view;
Fig. 5 is the close-up schematic view of II in Fig. 4.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is expanded on further. Should be understood that these embodiments are merely to illustrate the present invention rather than restriction the scope of the present invention. In addition, it is to be understood that after having read the content that the present invention lectures, the present invention can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application appended claims limited range equally.
Embodiment
As shown in Figure 2, the piston avoiding clamping stagnation of the present invention, by setting gradually hemisphere portion 4 from top to bottom, Part I 1, reverse frustoconic part 5, Part II 2 and Part III 3 form, Part I 1, Part II 2 and Part III 3 are cylindrical, the upside of described Part I 1 is provided with hemisphere portion 4, by reverse frustoconic part 5 transition between described Part I 1 and Part II 2, the external diameter of the end face of reverse frustoconic part 5 is equal with the external diameter of Part I 1, the external diameter of the bottom surface of reverse frustoconic part 5 is equal with the external diameter of Part II 2, described hemisphere portion 4, Part I 1, reverse frustoconic part 5, Part II 2 and Part III 3 are one-body molded.
As it is shown on figure 3, the external diameter of the first cylindrical part 1 ensure that piston can pass through flexibly, and little with the gap of piston seat inner cylinder face. The end face of Part III 3 is circular, and its external diameter is more than the external diameter of Part I 1, and the external diameter of Part I 1 is more than the external diameter of Part II 2, wherein, adopts rounding 2-3 transition between the side 2-2 and the end face 2-4 of Part III 3 of Part II 2.
During use, as shown in Figure 4 and Figure 5, pilot-actuated valve working piston return, piston seat lower end outer toroid plane 5-1 and the end face 2-4 of Part III 3 contacts generation impact force, impact force contact was touched by former line and is changed over face contact, lifting surface area becomes big, effect pressure reduces, so that piston seat is very little by impact force deflection, add rounding 2-3, above-mentioned impact force is the side 2-2 that the active force converted to upwards directly acts on Part II 2, but the side 2-2 external diameter that will not cause Part II 2 becomes big, simultaneously when pilot-actuated valve long-term work, the external diameter of the permanent side 2-2 more than Part II 2 of the produced seamed edge internal diameter of collision place deformation, so the fault of piston clamping stagnation is completely avoided.

Claims (3)

1. the piston avoiding clamping stagnation, it is characterized in that, including the Part I (1) set gradually from top to bottom, Part II (2) and Part III (3), Part I (1) and Part II (2) are cylindrical, the end face of Part III (3) is circular, its external diameter is more than the external diameter of Part I (1), the external diameter of Part I (1) is more than the external diameter of Part II (2), wherein, rounding (2-3) transition is adopted between side (2-2) and the end face (2-4) of Part III (3) of Part II (2).
2. avoid the piston of clamping stagnation as claimed in claim 1, it is characterised in that described Part III (3) is cylindrical.
3. avoid the piston of clamping stagnation as claimed in claim 1, it is characterized in that, the upside of described Part I (1) is provided with hemisphere portion (4), it is provided with reverse frustoconic part (5) between described Part I (1) and Part II (2), the external diameter of the end face of reverse frustoconic part (5) is equal with the external diameter of Part I (1), the external diameter of the bottom surface of reverse frustoconic part (5) is equal with the external diameter of Part II (2), described hemisphere portion (4), Part I (1), reverse frustoconic part (5), Part II (2) and Part III (3) are one-body molded.
CN201610210304.XA 2016-04-06 2016-04-06 Piston for avoiding clamping stagnation Pending CN105673931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610210304.XA CN105673931A (en) 2016-04-06 2016-04-06 Piston for avoiding clamping stagnation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610210304.XA CN105673931A (en) 2016-04-06 2016-04-06 Piston for avoiding clamping stagnation

Publications (1)

Publication Number Publication Date
CN105673931A true CN105673931A (en) 2016-06-15

Family

ID=56308464

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610210304.XA Pending CN105673931A (en) 2016-04-06 2016-04-06 Piston for avoiding clamping stagnation

Country Status (1)

Country Link
CN (1) CN105673931A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857642A (en) * 1973-02-26 1974-12-31 Ingersoll Rand Co Flexible or universal coupling means
CN2674204Y (en) * 2003-12-24 2005-01-26 沈阳气体压缩机股份有限公司 Piston rod
KR20090009988U (en) * 2008-03-28 2009-10-01 현대제철 주식회사 Flange Structure for Piston Rod of Hydraulic Cylinder
CN101941657A (en) * 2010-09-20 2011-01-12 中煤邯郸煤矿机械有限责任公司 Integral seal jack
CN201779251U (en) * 2010-08-31 2011-03-30 安徽省临泉县智创精机有限公司 Small piston
CN102182563A (en) * 2011-01-25 2011-09-14 浙江亿日气动科技有限公司 Pressure limiting seal piston and exhaust brake butterfly valve thereof
CN102765674A (en) * 2012-07-04 2012-11-07 常熟通润汽车零部件股份有限公司 Piston rod and cylinder body matched structure for hydraulic jack
CN202657901U (en) * 2012-06-25 2013-01-09 郑州煤矿机械集团股份有限公司 Rubber pipe connector for deep hole piston rod of hydraulic support jack
CN203431152U (en) * 2013-08-13 2014-02-12 宁波镇明转轴有限公司 Piston shaft of oil supply system of engine
CN205618816U (en) * 2016-04-06 2016-10-05 龙工(上海)精工液压有限公司 Avoid piston of jamming

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857642A (en) * 1973-02-26 1974-12-31 Ingersoll Rand Co Flexible or universal coupling means
CN2674204Y (en) * 2003-12-24 2005-01-26 沈阳气体压缩机股份有限公司 Piston rod
KR20090009988U (en) * 2008-03-28 2009-10-01 현대제철 주식회사 Flange Structure for Piston Rod of Hydraulic Cylinder
CN201779251U (en) * 2010-08-31 2011-03-30 安徽省临泉县智创精机有限公司 Small piston
CN101941657A (en) * 2010-09-20 2011-01-12 中煤邯郸煤矿机械有限责任公司 Integral seal jack
CN102182563A (en) * 2011-01-25 2011-09-14 浙江亿日气动科技有限公司 Pressure limiting seal piston and exhaust brake butterfly valve thereof
CN202657901U (en) * 2012-06-25 2013-01-09 郑州煤矿机械集团股份有限公司 Rubber pipe connector for deep hole piston rod of hydraulic support jack
CN102765674A (en) * 2012-07-04 2012-11-07 常熟通润汽车零部件股份有限公司 Piston rod and cylinder body matched structure for hydraulic jack
CN203431152U (en) * 2013-08-13 2014-02-12 宁波镇明转轴有限公司 Piston shaft of oil supply system of engine
CN205618816U (en) * 2016-04-06 2016-10-05 龙工(上海)精工液压有限公司 Avoid piston of jamming

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Application publication date: 20160615