CN103256270A - Pedal pilot valve - Google Patents

Pedal pilot valve Download PDF

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Publication number
CN103256270A
CN103256270A CN201310196136XA CN201310196136A CN103256270A CN 103256270 A CN103256270 A CN 103256270A CN 201310196136X A CN201310196136X A CN 201310196136XA CN 201310196136 A CN201310196136 A CN 201310196136A CN 103256270 A CN103256270 A CN 103256270A
Authority
CN
China
Prior art keywords
valve
spool
frustum
oil
diameter
Prior art date
Application number
CN201310196136XA
Other languages
Chinese (zh)
Inventor
王小忠
刘建辉
张志恒
高火金
王硕
王献岭
张记方
Original Assignee
平原机器厂(新乡)
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 平原机器厂(新乡) filed Critical 平原机器厂(新乡)
Priority to CN201310196136XA priority Critical patent/CN103256270A/en
Publication of CN103256270A publication Critical patent/CN103256270A/en

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Abstract

The invention relates to a pedal pilot valve which comprises a valve body, a valve core is arranged in a valve core mounting hole of the valve body in a penetrating mode, an annular boss is arranged between an oil return cavity of the valve body and an oil inlet of the valve body and on the hole wall of the valve core mounting hole, and an upper protruded shoulder and a lower protruded shoulder are arranged on the valve core, wherein the upper protruded shoulder and the lower protruded shoulder are used for being matched with the annular boss in a sliding mode. A pedal plate used for pushing the valve core to move down through a push rod is arranged on the valve body, and a frustum is arranged at the lower end of the upper protruded shoulder in a downward-protruded mode, wherein the diameter of the upper end of the frustum is large, and the diameter of the lower end of the frustum is small. The diameter of the large end of the frustum is smaller than or equal to the diameter of the upper protruded shoulder, the frustum and the upper protruded shoulder are arranged in a coaxial line mode, and an upper throttling groove is formed in the periphery of the frustum, wherein the upper throttling groove is used for communicating a decompression opening and the oil return cavity through a center hole of the valve core. The pedal pilot valve can guarantee the service life of the valve core and the service life of the valve body and guarantee stable oil mass changes of hydraulic oil in the process of communicating and breaking the oil return cavity and the decompression opening.

Description

Foot-operated pilot valve

Technical field

The foot-operated pilot valve that the present invention relates to use in the engineering machinery.

Background technique

Foot-operated pilot valve is the hydraulic product that is widely used in various engineering machinery and construction machinery equipment, main effect is the commutation of accurately controlling main reversing valve at the hydraulic system medium-long range, and then control the accurate action of executive components such as required oil hydraulic motor and oil cylinder, this type product is widely used in the walking hydraulic control of equipment at present.Existing foot-operated pilot valve such as Chinese patent CN202659966U disclosed " a kind of foot-operated pilot valve ", in comprising, this foot-operated pilot valve is provided with the valve body of oil back chamber and the valve gap that lid is loaded on the valve body upper end, the top of valve gap is hinged with foot treadle, valve body is provided with the return opening that is communicated with oil back chamber, also is provided with the spool mounting hole that is communicated with oil back chamber and filler opening and the pressure-reduction outlet that is communicated with the spool mounting hole on the valve body.Be provided with the spool of center hole in being coated with in the spool mounting hole, between filler opening and oil back chamber, be provided with annular boss on the hole wall of spool mounting hole, be arranged at intervals with up and down on the spool for annular boss sealed sliding upper and lower convex shoulder movingly, last convex shoulder is provided with for the last throttling groove by center hole conducting pressure-reduction outlet and oil back chamber, and following convex shoulder is provided with for the following throttling groove by center hole conducting pressure-reduction outlet and filler opening.The upper end outer race of spool is equipped with spring mounting seat, spring mounting seat and valve body and spool lower end are top-loaded with Returnning spring and driving spring respectively, spring mounting seat is provided with the spool perforation of passing for spool, be provided with diameter less than the spool shaft shoulder of spool piercing aperture in the top of spool perforation on the spool, pad is equipped with the transmission pad between the spool shaft shoulder and the spring mounting seat, the diameter of bore of transmission pad is less than the diameter of the spool shaft shoulder, this transmission pad is formed dress by two semi-circular pads, in the top of spring mounting seat the push rod guide sleeve is installed on the valve body, guiding is coated with the push rod that is promoted by foot treadle in the endoporus of push rod guide sleeve, the lower end of push rod cooperates with the spring mounting seat pushing tow, and the lower end of push rod also is provided with the shaft shoulder pilot hole that installs for spool shaft shoulder guiding.During use, when foot treadle is in meta (when namely not overturning), Returnning spring by the transmission pad with spool and push rod pushing tow on the top, pressure-reduction outlet is communicated with oil back chamber and return opening by center hole and last throttling groove, pressure oil is back to fuel tank, and the pressure of pressure-reduction outlet is zero; When foot treadle overturns, the footboard drives push rod moves down, push rod drives spool by driving spring and moves down, throttling groove and oil back chamber are disconnected, pressure-reduction outlet is communicated with filler opening by center hole and following throttling groove, pressure oil is through filler opening, radially oil-through hole and pressure-reduction outlet output, thereby realizes corresponding main valve work.

The problem that existing this foot-operated pilot valve exists is: because last throttling groove is arranged on the cylindricality circumferential surface of convex shoulder, move in the process that makes throttling groove connection oil back chamber and pressure-reduction outlet at spool, can only come conducting pressure-reduction outlet and oil back chamber by last throttling groove, move down in the process that disconnects oil back chamber and pressure-reduction outlet at spool, the closed process of last throttling groove also can be very rapidly, in the process of conducting and disconnection oil back chamber and pressure-reduction outlet, the flow nonlinear change of hydraulic oil, the changes in flow rate of hydraulic oil is steady inadequately; On the other hand, the foul particle that accumulates between convex shoulder and the annular boss can cause wearing and tearing to the outer circumferential face of spool and the hole wall of spool mounting hole, influences the working life of spool and valve body.

Summary of the invention

The object of the present invention is to provide a kind of working life that can guarantee spool and valve body, can guarantee that again hydraulic-oil quantity changes foot-operated pilot valve stably in the process of conducting and disconnection oil back chamber and pressure-reduction outlet.

In order to address the above problem, technological scheme of the present invention is:

Foot-operated pilot valve, comprise valve body, be coated with spool in the spool mounting hole of valve body, between the oil back chamber of valve body and filler opening, be provided with annular boss on the hole wall of spool mounting hole, spool be provided with for described annular boss sealed sliding movingly, following convex shoulder, valve body is provided with by push rod and promotes the foot treadle that described spool moves down, it is big that the described lower ends downward that goes up convex shoulder convexes with upper end diameter, the frustum that lower end diameter is little, the Outside diameter of described frustum is not more than the described diameter of going up convex shoulder, described frustum and the described convex shoulder of going up are coaxially set, and offer on the outer circumferential face of described frustum for the last throttling groove by the center hole conducting pressure-reduction outlet on the spool and oil back chamber.

The described upward span of throttling groove on above-below direction is not less than the axial height of described frustum.

The described semicircle that is shaped as that goes up throttling groove.

Beneficial effect of the present invention is: spool is when being on the top, filler opening is by the following convex shoulder shutoff of spool, pressure-reduction outlet passes through center hole, radial clearance between last throttling groove and frustum and the annular boss and oil back chamber conducting, when needs filler opening and pressure-reduction outlet conducting, spool moves down, last throttling groove is gradually by shutoff, radial clearance between frustum and the annular boss is also dwindled gradually simultaneously, radial clearance between frustum and the annular boss is dwindled gradually the flow of hydraulic oil between pressure-reduction outlet and the oil back chamber is diminished gradually, the flow of hydraulic oil keeps linear change, changes in flow rate is steady, has reduced flow resistance; In like manner, in the process of pressure-reduction outlet and oil back chamber conducting, the flow of hydraulic oil becomes greatly gradually, and the flow of hydraulic oil is linear variation also; In addition, radial clearance between frustum and the annular boss can also store the foul particle, when spool moves down, the foul particle is stored in the radial clearance between frustum and the annular boss, can not damage the face that is sealed and matched between convex shoulder and the annular boss, guarantee the working life of spool and valve body, when spool moves, foul particle between frustum and the annular boss in the gap is dashed to oil back chamber by hydraulic oil, and then flows into corresponding fuel tank.

Description of drawings

Fig. 1 is the structural representation of an embodiment of foot-operated pilot valve among the present invention;

Fig. 2 is the schematic representation that cooperates of spool and valve body among Fig. 1;

Fig. 3 is the cooperation schematic representation that spool among Fig. 1, push rod close spring mounting seat;

Fig. 4 is the plan view of Fig. 3 medi-spring fitting seat.

Embodiment

The embodiment of foot-operated pilot valve is shown in Fig. 1 ~ 4: be provided with the valve body 1 of oil back chamber 29 and the valve gap 15 that lid is loaded on the valve body upper end in comprising, the top of valve gap is hinged with pedal 19, is covered with boot seal 22 on the pedal.The spool mounting hole 33 that valve body is provided with return opening 28, filler opening 30, pressure-reduction outlet 31 and communicates with return opening, filler opening, pressure-reduction outlet, return opening is arranged on the chamber wall of oil back chamber.Between oil back chamber and filler opening, be provided with annular boss 33-1 on the hole wall of spool mounting hole, guiding is coated with spool 2 in the annular boss, be arranged at intervals with up and down on the spool for annular boss sealed sliding last convex shoulder 2-1 movingly and following convex shoulder 2-2, the lower ends downward of last convex shoulder convexes with the frustum 37 that upper end diameter is big, lower end diameter is little, frustum and last convex shoulder are coaxially set, the Outside diameter of frustum is slightly less than the diameter of convex shoulder, so more helps to store the booty particle.Offer on the outer circumferential face of frustum for by the center hole on the spool and the last throttling groove 34-1 of oil-through hole 35 conducting pressure-reduction outlets and oil back chamber radially, offer on the following convex shoulder for by described center hole and the following throttling groove 34-2 of oil-through hole conducting pressure-reduction outlet and filler opening radially, the shape of upper and lower throttling groove is semicircle, and the span of last throttling groove on above-below direction is greater than the axial height of frustum.The upper end of spool is set with spring mounting seat 8, be top-loaded with Returnning spring 6 and driving spring 7 between spring mounting seat and valve body and the spool respectively, Returnning spring and driving spring all adopt the low-carbon (LC) Spring Steel Wire, spring mounting seat is provided with the spool perforation 40 that runs through spring mounting seat along the vertical direction, the shape of cross section of spool perforation is Pear Shaped, the big bore portion 40-1 of spool perforation passes from the bottom to top for the spool shaft shoulder 2-3 on the spool, the diameter of the aperture part 40-2 of spool perforation is less than the external diameter of the spool shaft shoulder, and is big, the bore of aperture part joint is not less than the spool external diameter that is connected with spool shaft shoulder lower end.Be provided with push rod guide sleeve 13 in the top of spring mounting seat on the valve body, be coated with push rod 14 by Yx RunddichtringO 11 sealing guiding in the endoporus of push rod guide sleeve, the lower end of push rod 14 cooperates with the upper end pushing tow of spring mounting seat, the lower end of push rod is provided with the shaft shoulder pilot hole 14-1 that vertically leads and install for the spool shaft shoulder, and the little bore portion of shaft shoulder pilot hole and spool perforation is coaxially set.The upper end of push rod is used for cooperating with pedal bottom pushing tow, the lower end of push rod guide sleeve is provided with the flange 32 that turns up, the upper end of push rod guide sleeve is plugged in guide sleeve first mounting hole 27 on the valve gap, the flange that turns up of push rod guide sleeve seals in guide sleeve second mounting hole 25 that is inserted on the valve body by O RunddichtringO 10, be provided with installation step 26 between guide sleeve second mounting hole and the oil back chamber, installation step has spacing be directed upwardly, be used for the step surface that block cooperates bottom the flange that turns up, pad is equipped with two adjusting pads 24 between the following stomidium edge of the upper-end surface of the flange that turns up and guide sleeve first mounting hole.Spool lower end outer circumferential face is provided with multi-turn along the balancing slit 36 of the axially spaced-apart setting of spool.12 expression dust rings among the figure; 16 expression hexagon socket head cap screws; 17 expression locking nuts; 18 expression lock screws; Hexagonal fastening screw trip bolt in 20 expressions; 21 expression pedal hinging shafts.

When pedal was in meta, pedal was not to the push rod application of force, and spool is on the top, and pressure-reduction outlet is by center hole, radially oil-through hole and last throttling groove are communicated with oil back chamber and return opening; When pedal during to the push rod application of force, push rod promotes spool by driving spring and moves down, and oil back chamber is by shutoff, and pressure-reduction outlet is by center hole, radially oil-through hole and following throttling groove are communicated with filler opening.The setting of balancing slit reduces hydraulic card clamping force significantly, because it can play the effect of spool being pushed to the valve body hole center, therefore can reduce leakage rate again simultaneously; In addition, balancing slit provides the place of storage booty particle, thereby can alleviate the booty particle to the scratch on spool and valve body hole surface.The technology capability of U-shaped throttling groove is better, and changes in flow rate is steady, and the flow fine setting property of micro-control section is linear substantially, and the antiblocking characteristic is good, has improved the linear performance of foot-operated pilot valve.The assembly process of spring mounting seat and spool is: at first the spool shaft shoulder on the spool is passed by the big bore portion top of spool perforation, the spool that promotes to be connected with spool shaft shoulder lower end then moves in the little bore portion of spool perforation, then spool shaft shoulder guiding is plugged in the shaft shoulder pilot hole on the push rod, be subjected to the position-limiting action of shaft shoulder pilot hole, spool is limited in the little bore portion of spool perforation, because the aperture of little bore portion is less than the external diameter of the spool shaft shoulder, so the upper end hole of little bore portion cooperates with the lower end thrust of the spool shaft shoulder along meeting, in that spring mounting seat is stressed when moving, spring mounting seat can drive on the spool and move.The present invention is by being arranged to a hardy hole with spool perforation, uses a spring mounting seat just can realize installation to spool not needing to arrange gasket construction, makes the simple while of product structure, also made things convenient for the installation of spool.

In other embodiment of this foot-operated pilot valve: according to the height difference of turning up between flange and guide sleeve second mounting hole, the number of regulating pad can also be one, three or other number; The number of turns of balancing slit can also be a circle, three circle or other number of turns; The shape of upper and lower throttling groove also can be square, U-shaped or other shape; The span that last throttling groove is gone up along the vertical direction also can be equal to or less than the axial height of frustum; The Outside diameter of frustum also can be identical with the diameter of last convex shoulder.

Claims (3)

1. ride pilot valve, comprise valve body, be coated with spool in the spool mounting hole of valve body, between the oil back chamber of valve body and filler opening, be provided with annular boss on the hole wall of spool mounting hole, spool be provided with for described annular boss sealed sliding movingly, following convex shoulder, valve body is provided with by push rod and promotes the foot treadle that described spool moves down, it is characterized in that: it is big that the described lower ends downward that goes up convex shoulder convexes with upper end diameter, the frustum that lower end diameter is little, the Outside diameter of described frustum is not more than the described diameter of going up convex shoulder, described frustum and the described convex shoulder of going up are coaxially set, and offer on the outer circumferential face of described frustum for the last throttling groove by the center hole conducting pressure-reduction outlet on the spool and oil back chamber.
2. foot-operated pilot valve according to claim 1 is characterized in that: describedly go up the axial height that the span of throttling groove on above-below direction is not less than described frustum.
3. foot-operated pilot valve according to claim 1 and 2 is characterized in that: the described semicircle that is shaped as that goes up throttling groove.
CN201310196136XA 2013-05-24 2013-05-24 Pedal pilot valve CN103256270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310196136XA CN103256270A (en) 2013-05-24 2013-05-24 Pedal pilot valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310196136XA CN103256270A (en) 2013-05-24 2013-05-24 Pedal pilot valve

Publications (1)

Publication Number Publication Date
CN103256270A true CN103256270A (en) 2013-08-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310196136XA CN103256270A (en) 2013-05-24 2013-05-24 Pedal pilot valve

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106065884A (en) * 2016-08-19 2016-11-02 龙工(上海)精工液压有限公司 Effectively reduce the structure of foot valve fore-set abrasion

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012576A (en) * 1959-02-24 1961-12-12 Commercial Shearing Control valves with spool check and spool alignment devices
GB2281115A (en) * 1993-08-17 1995-02-22 Kubota Kk Hydraulic pilot valve
JPH0882304A (en) * 1994-09-12 1996-03-26 Shin Caterpillar Mitsubishi Ltd Fluid pressure pilot valve
CN1356481A (en) * 2001-12-27 2002-07-03 卢永松 Balancing valve
JP2007205427A (en) * 2006-01-31 2007-08-16 Kawasaki Precision Machinery Ltd Pilot valve
CN201236972Y (en) * 2008-07-02 2009-05-13 浙江苏强格液压有限公司 Variable pin pilot valve
CN101893010A (en) * 2009-05-21 2010-11-24 上海立新液压有限公司 Hydraulic balanced valve
CN201991859U (en) * 2011-04-06 2011-09-28 邵燕平 Four-path pedal pilot valve
CN202659966U (en) * 2012-05-11 2013-01-09 贵州强流液压有限责任公司 Foot stepping pilot valve
CN203272308U (en) * 2013-05-24 2013-11-06 平原机器厂(新乡) Pedal pilot valve

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012576A (en) * 1959-02-24 1961-12-12 Commercial Shearing Control valves with spool check and spool alignment devices
GB2281115A (en) * 1993-08-17 1995-02-22 Kubota Kk Hydraulic pilot valve
JPH0882304A (en) * 1994-09-12 1996-03-26 Shin Caterpillar Mitsubishi Ltd Fluid pressure pilot valve
CN1356481A (en) * 2001-12-27 2002-07-03 卢永松 Balancing valve
JP2007205427A (en) * 2006-01-31 2007-08-16 Kawasaki Precision Machinery Ltd Pilot valve
CN201236972Y (en) * 2008-07-02 2009-05-13 浙江苏强格液压有限公司 Variable pin pilot valve
CN101893010A (en) * 2009-05-21 2010-11-24 上海立新液压有限公司 Hydraulic balanced valve
CN201991859U (en) * 2011-04-06 2011-09-28 邵燕平 Four-path pedal pilot valve
CN202659966U (en) * 2012-05-11 2013-01-09 贵州强流液压有限责任公司 Foot stepping pilot valve
CN203272308U (en) * 2013-05-24 2013-11-06 平原机器厂(新乡) Pedal pilot valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106065884A (en) * 2016-08-19 2016-11-02 龙工(上海)精工液压有限公司 Effectively reduce the structure of foot valve fore-set abrasion

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Application publication date: 20130821