CN203272308U - Pedal pilot valve - Google Patents
Pedal pilot valve Download PDFInfo
- Publication number
- CN203272308U CN203272308U CN 201320287545 CN201320287545U CN203272308U CN 203272308 U CN203272308 U CN 203272308U CN 201320287545 CN201320287545 CN 201320287545 CN 201320287545 U CN201320287545 U CN 201320287545U CN 203272308 U CN203272308 U CN 203272308U
- Authority
- CN
- China
- Prior art keywords
- spool
- valve body
- diameter
- valve
- frustum
- 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.)
- Expired - Fee Related
Links
- 239000000945 filler Substances 0.000 claims description 14
- 239000003921 oil Substances 0.000 abstract description 34
- 239000010720 hydraulic oil Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000006837 decompression Effects 0.000 abstract 2
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 7
- 230000014509 gene expression Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 235000014443 Pyrus communis Nutrition 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Landscapes
- Mechanically-Actuated Valves (AREA)
Abstract
The utility model relates to a pedal pilot valve which comprises a valve body. A valve element is installed in a valve element installation hole of the valve body in a penetrated mode, an annular boss is arranged at the position, between an oil return cavity of the valve body and an oil inlet of the valve body, of the hole wall of the valve element installation hole, an upper protruding shoulder and a lower protruding shoulder which are in sealing and sliding fit with the annular boss are arranged on the valve element, a pedal plate for pushing the valve element to downwards move through a push rod is arranged on the valve body, a taper-shaped table is downwards arranged at the lower end of the upper protruding shoulder in a protruding mode, the diameter of the upper end of the taper-shaped table is large, the diameter of the lower end of the taper-shaped table is small, the diameter of the big end of the taper-shaped table is not larger than the diameter of the upper protruding shoulder, the taper-shaped table and the upper protruding shoulder are coaxially arranged, and an upper throttling groove for communicating a decompression opening and the oil return cavity through a central hole in the valve element is formed in the peripheral face of the taper-shaped table. The pedal pilot valve can guarantee the service life of the valve element and the valve body, and guarantee that oil quantity changes of hydraulic oil are stable in the processes of connecting and disconnecting the oil return cavity with the decompression opening.
Description
Technical field
The utility model relates to the pedal pilot valve that uses in engineering machinery.
Background technique
Pedal pilot valve is the hydraulic product that is widely used in various engineering machinery and construction machinery equipment, Main Function is accurately to control the commutation of main reversing valve at the hydraulic system medium-long range, and then control the accurate action of the 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 pedal pilot valve as disclosed in Chinese patent CN202659966U " a kind of pedal pilot valve ", be provided with the valve body of oil back chamber in this pedal pilot valve comprises and mount cover in the valve gap of valve body upper end, the top of valve gap is hinged with foot treadle, be provided with the return opening that is communicated with oil back chamber on valve body, also be 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 valve body.Be provided with the spool of center hole in being coated with in the spool mounting hole, be provided with annular boss on the hole wall of spool mounting hole between filler opening and oil back chamber, be arranged at intervals with up and down on spool for annular boss sealed sliding upper and lower convex shoulder movingly, be provided with on upper convex shoulder for the upper throttling groove by center hole conducting pressure-reduction outlet and oil back chamber, be provided with on lower convex shoulder for the lower 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 respectively Returnning spring and driving spring, be provided with the spool perforation of passing for spool on spring mounting seat, be provided with diameter less than the spool shaft shoulder of spool piercing aperture in the top of spool perforation on spool, between the spool shaft shoulder and spring mounting seat, pad is equipped with the transmission pad, 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 valve body, in the endoporus of push rod guide sleeve, guiding is coated with the push rod that is promoted by foot treadle, the lower end of push rod coordinates with the spring mounting seat pushing tow, 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 to the upper position, pressure-reduction outlet is communicated with oil back chamber and return opening by center hole and upper 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 moves down by driving spring band movable valve plug, throttling groove and oil back chamber are disconnected, pressure-reduction outlet is communicated with filler opening by center hole and lower 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 pedal pilot valve exists is: be arranged on due to upper throttling groove on the cylindricality circumferential surface of upper convex shoulder, move on spool throttling groove is communicated with in the process of oil back chamber and pressure-reduction outlet, can only come conducting pressure-reduction outlet and oil back chamber by upper throttling groove, move down in the process that disconnects oil back chamber and pressure-reduction outlet at spool, the closed process of upper throttling groove also can be very rapidly, in conducting and disconnecting the process of oil back chamber and pressure-reduction outlet, the flow nonlinear change of hydraulic oil, the changes in flow rate of hydraulic oil is steady not; On the other hand, the foul particle that is gathered between convex shoulder and annular boss can cause wearing and tearing to the outer circumferential face of spool and the hole wall of spool mounting hole, affects the working life of spool and valve body.
The model utility content
The purpose of this utility model is to provide a kind of working life that can guarantee spool and valve body, can guarantee that again hydraulic-oil quantity changes pedal pilot valve stably in the process of conducting and disconnection oil back chamber and pressure-reduction outlet.
In order to address the above problem, the technical solution of the utility model is:
pedal pilot valve, comprise valve body, be coated with spool in the spool mounting hole of valve body, be provided with annular boss on the hole wall of spool mounting hole between the oil back chamber of valve body and filler opening, be provided with on spool for described annular boss sealed sliding movingly, lower convex shoulder, be provided with on valve body by push rod and promote the foot treadle that described spool moves down, it is large that the lower end of described upper convex shoulder convexes with upper end diameter downwards, the frustum that lower end diameter is little, the Outside diameter of described frustum is not more than the diameter of described upper convex shoulder, described frustum and described upper convex shoulder are coaxially set, offer on the outer circumferential face of described frustum for the upper throttling groove by the center hole conducting pressure-reduction outlet on spool and oil back chamber.
The span of described upper throttling groove on above-below direction is not less than the axial height of described frustum.
Described upper throttling groove be shaped as semicircle.
the beneficial effects of the utility model are: spool is when being in the upper position, filler opening is by the lower convex shoulder shutoff of spool, pressure-reduction outlet passes through center hole, radial clearance between upper throttling groove and frustum and annular boss and oil back chamber conducting, when needs filler opening and pressure-reduction outlet conducting, spool moves down, upper throttling groove is gradually by shutoff, radial clearance between frustum and annular boss is also dwindled gradually simultaneously, radial clearance between frustum and annular boss is dwindled gradually the flow of hydraulic oil between pressure-reduction outlet and oil back chamber is diminished gradually, the flow of hydraulic oil keeps linear change, changes in flow rate is steady, 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 annular boss can also store the foul particle, when spool moves down, the foul particle is stored in radial clearance between frustum and annular boss, can not damage the face that is sealed and matched between convex shoulder and annular boss, guarantee the working life of spool and valve body, when moving on spool, foul particle in frustum and annular boss gap is rushed 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 pedal pilot valve in the utility model;
Fig. 2 is the schematic diagram that coordinates of spool and valve body in Fig. 1;
Fig. 3 is the cooperation schematic diagram that spool in 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 pedal pilot valve is as shown in Fig. 1 ~ 4: be provided with the valve body 1 of oil back chamber 29 in comprising and mount cover in the valve gap 15 of valve body upper end, the top of valve gap is hinged with pedal 19, is covered with boot seal 22 on pedal.The spool mounting hole 33 that is provided with return opening 28, filler opening 30, pressure-reduction outlet 31 on valve body and communicates with return opening, filler opening, pressure-reduction outlet, return opening is arranged on the chamber wall of oil back chamber.Be provided with annular boss 33-1 on the hole wall of spool mounting hole between oil back chamber and filler opening, in annular boss, guiding is coated with spool 2, be arranged at intervals with up and down on spool for annular boss sealed sliding upper convex shoulder 2-1 and lower convex shoulder 2-2 movingly, the lower end of upper convex shoulder convexes with the frustum 37 that upper end diameter is large, lower end diameter is little downwards, frustum and upper 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 spool and the upper throttling groove 34-1 of oil-through hole 35 conducting pressure-reduction outlets and oil back chamber radially, offer on lower convex shoulder for by described center hole and the lower 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 upper 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 respectively Returnning spring 6 and driving spring 7 between spring mounting seat and valve body and spool, Returnning spring and driving spring all adopt the low-carbon spring steel silk, be provided with the spool perforation 40 that runs through along the vertical direction spring mounting seat on spring mounting seat, the shape of cross section of spool perforation is Pear Shaped, the large bore portion 40-1 of spool perforation passes from the bottom to top for the spool shaft shoulder 2-3 on spool, the diameter of the aperture part 40-2 of spool perforation is less than the external diameter of the spool shaft shoulder, greatly, 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 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 coordinates 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 coordinates for pushing tow bottom pedal, 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 the first mounting hole 27 on valve gap, the flange that turns up of push rod guide sleeve seals in guide sleeve the second mounting hole 25 that is inserted on valve body by O RunddichtringO 10, be provided with installation step 26 between guide sleeve the second mounting hole and oil back chamber, installation step has spacing be directed upwardly, be used for the step surface that block coordinates bottom the flange that turns up, turn up the upper-end surface of flange and guide sleeve the first mounting hole lower stomidium along between pad be equipped with two and regulate pads 24.Be provided with multi-turn on the outer circumferential face of spool lower end along the balancing slit 36 of the axially spaced-apart setting of spool.12 expression dust rings in 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, to the push rod application of force, spool was not in the upper position to pedal, and pressure-reduction outlet is by center hole, radially oil-through hole and upper throttling groove are communicated with oil back chamber and return opening; During to the push rod application of force, push rod promotes spool by driving spring and moves down when pedal, and oil back chamber is by shutoff, and pressure-reduction outlet is by center hole, radially oil-through hole and lower throttling groove are communicated with filler opening.The setting of balancing slit significantly reduces hydraulic card clamping force, simultaneously because it can play the effect of spool being pushed to the valve body hole center, therefore can reduce leakage rate again; 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 it is linear that the flow rate fine-tuning of micro-control section is substantially, and the antiblocking characteristic is good, has improved the linear performance of pedal pilot valve.the assembly process of spring mounting seat and spool is: at first pass above the large bore portion of the spool shaft shoulder on spool by the spool perforation, then the spool that promotes to be connected with spool shaft shoulder lower end moves in the little bore portion that spool bores a hole, then spool shaft shoulder guiding is plugged in the shaft shoulder pilot hole on 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, due to the aperture of the little bore portion external diameter less than the spool shaft shoulder, so the upper end hole of little bore portion coordinates with the lower end thrust of the spool shaft shoulder along meeting, when moving on spring mounting seat is stressed, spring mounting seat can be with on movable valve plug and move.The utility model is by being arranged to a hardy hole with spool perforation, uses a spring fitting toilet can realize installation to spool not needing to arrange gasket construction, makes the simple while of product structure, also facilitated the installation of spool.
In other embodiment of this pedal pilot valve: according to the height difference of turning up between flange and guide sleeve the 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 can be also square, U-shaped or other shape; The span that upper 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 upper convex shoulder.
Claims (3)
1. pedal pilot valve, comprise valve body, be coated with spool in the spool mounting hole of valve body, be provided with annular boss on the hole wall of spool mounting hole between the oil back chamber of valve body and filler opening, be provided with on spool for described annular boss sealed sliding movingly, lower convex shoulder, be provided with on valve body by push rod and promote the foot treadle that described spool moves down, it is characterized in that: it is large that the lower end of described upper convex shoulder convexes with upper end diameter downwards, the frustum that lower end diameter is little, the Outside diameter of described frustum is not more than the diameter of described upper convex shoulder, described frustum and described upper convex shoulder are coaxially set, offer on the outer circumferential face of described frustum for the upper throttling groove by the center hole conducting pressure-reduction outlet on spool and oil back chamber.
2. pedal pilot valve according to claim 1, it is characterized in that: the span of described upper throttling groove on above-below direction is not less than the axial height of described frustum.
3. pedal pilot valve according to claim 1 and 2 is characterized in that: described upper throttling groove be shaped as semicircle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320287545 CN203272308U (en) | 2013-05-24 | 2013-05-24 | Pedal pilot valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320287545 CN203272308U (en) | 2013-05-24 | 2013-05-24 | Pedal pilot valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203272308U true CN203272308U (en) | 2013-11-06 |
Family
ID=49502730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320287545 Expired - Fee Related CN203272308U (en) | 2013-05-24 | 2013-05-24 | Pedal pilot valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203272308U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256270A (en) * | 2013-05-24 | 2013-08-21 | 平原机器厂（新乡） | Pedal pilot valve |
-
2013
- 2013-05-24 CN CN 201320287545 patent/CN203272308U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256270A (en) * | 2013-05-24 | 2013-08-21 | 平原机器厂（新乡） | Pedal pilot valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201875226U (en) | Sequence valve | |
| CN203784001U (en) | Overflow valve | |
| CN203322343U (en) | Direct-acting overflow valve | |
| CN104728204A (en) | Distributor for tractor | |
| CN203272308U (en) | Pedal pilot valve | |
| CN203335887U (en) | Bi-direction sealing triple-eccentric butterfly valve | |
| CN203272311U (en) | Pedal pilot control valve | |
| CN103256270A (en) | Pedal pilot valve | |
| CN201925513U (en) | Top mounted ball valve of inner-propped compound seal forged steel | |
| CN201925504U (en) | Square integrated-cover-type hand-operated rising-stem wedge-shaped gate valve | |
| CN203272312U (en) | Spring installation seat for pilot valve and manual pilot valve using installation seat | |
| CN204493334U (en) | There is the used with tractor distributor of auto-reset function | |
| CN203272310U (en) | Manual operation pilot valve and valve element thereof | |
| CN209856413U (en) | Quick cut-off safety valve | |
| CN103256269A (en) | Manual pilot valve and spool thereof | |
| CN203441916U (en) | Direction adjustable oil bolt assembly | |
| CN103256268A (en) | Pedal pilot control valve | |
| CN201934109U (en) | Ultra-large-flow safety valve | |
| CN203297183U (en) | Manual pilot valve | |
| CN204099652U (en) | A kind of operation equipment of proportional multi-way valve | |
| CN104776078A (en) | Distributor with automatic restoring function for tractor | |
| CN203809835U (en) | Automatic switch valve | |
| CN203412838U (en) | Hydraulic control one-way valve for hydraulic system of excavator | |
| CN202708138U (en) | Stop valve | |
| CN203272309U (en) | Pedal pilot valve and guide sleeve installation structure thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 453000 Jiefang Road, Henan, Xinxiang, No. 1 Patentee after: Xinxiang Pingyuan Aviation Equipment Co., Ltd. Address before: 453000 Jiefang Road, Henan, Xinxiang, No. 1 Patentee before: Pingyuan Machine Factory (Xinxiang) |
|
| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20210524 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |