CN105736353A - Long pin used in central pre-tightening structure of plunger pump - Google Patents
Long pin used in central pre-tightening structure of plunger pump Download PDFInfo
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- CN105736353A CN105736353A CN201410753390.XA CN201410753390A CN105736353A CN 105736353 A CN105736353 A CN 105736353A CN 201410753390 A CN201410753390 A CN 201410753390A CN 105736353 A CN105736353 A CN 105736353A
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- long pin
- ball pivot
- cylinder body
- internal spline
- sector structure
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Abstract
The invention provides a long pin used in a central pre-tightening structure of a plunger pump. A fan-shaped structure is arranged at the tail end of the long pin. By the adoption of the long pin, stress concentration caused by pin pre-tightening can be reduced, and parts and the overall structure of the plunger pump are prevented from being damaged to a certain extent; and adjustment is easy, popularization is easy, and especially the long pin has high practical value for design of intermediate-pressure and low-pressure swash plate type axial plunger pumps.
Description
Technical field
The invention belongs to axial plunger pump center pre-pressing structure design field, particularly to the long pin used in the pre-pressing structure of a kind of plunger displacement pump center.
Background technology
At present, cam-type axial piston pump, generally by the pattern of center convolution shape spring and disk spring, cylinder body carried out pretension with dividing a food tray and ensures that plunger assembly backhaul makes piston shoes head and swash plate be adjacent to all the time, forming hydraulic support structure.But use disk spring to make plunger assembly backhaul, it is desirable to radial dimension is bigger.Simultaneously because force value is relatively big under disk spring unit deformation amount, trickle change in size is bigger on the impact of pretension force value.Between ball pivot and cylinder body, use coil spring pretension, spring base need to be increased, make pump axial dimension increase to some extent.Use coil spring to lengthen pin pattern and carry out pretension, easy to adjust, compact conformation, piston shoes-swash plate, cylinder body-point food tray can be carried out pretension simultaneously, but due to architectural limitation, pin diameter is less, concentrate easily caused by stress, make pin easily at the binding end facial disfigurement of ball pivot under the effect of hydraulic coupling and pretightning force, form pit, cause that plunger displacement pump work is unstable even to be destroyed.The present invention carries out pre-compact form and improves, increase sectorial area in long pin with ball-joint contravention, reduce in pretension process and cause stress to concentrate, be prevented effectively from the integrally-built destruction of part and plunger displacement pump using coil spring to add long pin.
Summary of the invention
It is an object of the invention to: the plunger displacement pump coil spring solving existing structure compact dimensions adds the design problem that long pin center pre-pressing structure generation stress is concentrated.
Technical solution of the present invention provides the long pin used in the pre-pressing structure of a kind of plunger displacement pump center, described center pre-pressing structure includes, cylinder body 1, ball pivot 2, helical spring 3, pad 4, long pin 5, described cylinder body 1 is cylindrical for hollow structure cavity, internal spline is had with the link of described ball pivot 2, described ball pivot 2 is the hemispherical end face other end for hollow structure one end is cylindrical end face, the inner edge of described ball pivot 2 is with internal spline, the end of described long pin 5 has a sector structure, described long pin is arranged on the internal spline place of described cylinder body 1, the cap end in contact pad 4 of described long pin 5, described pad 4 contacts one end of helical spring 3, pressure effect by described helical spring 3, the end sector structure of described long pin 5 withstands on the cylindrical end face of described ball pivot 2.
Preferably, the uniform position on the circumference that the internal spline of described cylinder body 1 is formed reams three rooted teeth of described internal spline, and described long pin 5 is arranged on and reams in the groove that tooth is formed and fixed by circlip.
Preferably, the sector structure of described long pin 5 with the center of circle of described ball pivot 2 for the center of circle, the little 0.2～0.5mm of ball pivot 2 described in radius ratio.
Preferably, the sector structure of described long pin 5 is to head of a nail direction rounding, it is to avoid interfere.
Preferably, the distance of ball pivot 2 and cylinder body 1 when the sector structure segment thickness of described long pin 5 is depressed into extreme position less than coil spring 3.
The invention have the advantage that and can improve the stress concentration that pin pretension causes, avoid the destruction to plunger pump component and population structure to a certain extent, regulate simple, it is easy to promote, particularly with in, the design of low pressure cam-type axial piston pump have higher use value.
Accompanying drawing explanation
Below accompanying drawing of the present invention is illustrated:
Centered by Fig. 1, pre-pressing structure illustrates figure；
Fig. 2 is long pin structure chart.
Detailed description of the invention
The embodiment of the present invention provides a kind of long pin used in the pre-pressing structure of plunger displacement pump center as shown in Figure 2, and the end of described long pin has a sector structure.
As shown in Figure 1, first coil spring 3 is placed in cylinder body 1, both sides are equipped with pad 4, right-hand member is carried out axial limiting by hole back-up ring 10, and the left side of left side pad 4 is withstood long pin 5 cylinder body 1 splined section uniform on three, cylinder body 1 spline place circumference uniform position on three place's circumference and spline tooth is carried out correction of the flank shape, when making long pin 5 be placed on this place, radius of a circle value residing for pin cylindrical is equal with spline path, splined driveshaft part is got out of the way by the position of circlip 9 back-up ring, avoid interference with to block long pin 5 and prevent vibration, it is easily installed power transmission shaft, so a point food tray left end for cylinder body 1 its right end face with pump is carried out pretension.Meanwhile, being close to the right side of ball pivot 4 on the left of long pin 5, ball pivot 2 is carried on a shoulder pole retainer 8 and is made piston shoes head and swash plate 6 pretension of plunger assembly 7.
The wherein centrage of the fan-shaped cylindrical R1 of long pin 5 and ball pivot 2 column part centerline collineation.The radius R1 of fan-shaped end face designs 0.2～0.5mm less of ball pivot 2 column part external diameter simultaneously.And rounding R2, it is to avoid interfering with retainer 8 in the process changing swash plate angle, sector structure segment thickness determines according to the distance between ball pivot 2 and cylinder body 1, the distance of ball pivot 2 and cylinder body 1 when thickness is depressed into extreme position less than coil spring 3.
Claims (5)
- null1. the long pin used in a plunger displacement pump center pre-pressing structure，Described center pre-pressing structure includes，Cylinder body (1)、Ball pivot (2)、Helical spring (3)、Pad (4)、Long pin (5)，Described cylinder body (1) is cylindrical for hollow structure cavity，Internal spline is had with the link of described ball pivot (2)，Described ball pivot (2) is the hemispherical end face other end for hollow structure one end is cylindrical end face，The inner edge of described ball pivot (2) is with internal spline，It is characterized in that，The end of described long pin (5) has a sector structure，Described long pin is arranged on the internal spline place of described cylinder body (1)，Cap end in contact pad (4) of described long pin (5)，One end of described pad (4) contact helical spring (3)，Pressure effect by described helical spring (3)，The end sector structure of described long pin (5) withstands on the cylindrical end face of described ball pivot (2).
- 2. long pin according to claim 1, it is characterized in that, uniform position on the circumference that the internal spline of described cylinder body (1) is formed reams three rooted teeth of described internal spline, and described long pin (5) is arranged on and reams in the groove that tooth is formed and fixed by circlip.
- 3. long pin according to claim 1, it is characterised in that the sector structure of described long pin (5) with the center of circle of described ball pivot (2) for the center of circle, ball pivot described in radius ratio (2) little 0.2～0.5mm.
- 4. long pin according to claim 3, it is characterised in that the sector structure of described long pin (5) is to head of a nail direction rounding, it is to avoid interfere.
- 5. long pin according to claim 4, it is characterised in that the distance of ball pivot (2) and cylinder body (1) when the sector structure segment thickness of described long pin (5) is depressed into extreme position less than coil spring (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410753390.XA CN105736353A (en) | 2014-12-10 | 2014-12-10 | Long pin used in central pre-tightening structure of plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410753390.XA CN105736353A (en) | 2014-12-10 | 2014-12-10 | Long pin used in central pre-tightening structure of plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105736353A true CN105736353A (en) | 2016-07-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410753390.XA Pending CN105736353A (en) | 2014-12-10 | 2014-12-10 | Long pin used in central pre-tightening structure of plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105736353A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2776628A (en) * | 1952-07-10 | 1957-01-08 | Vickers Inc | Power transmission |
| GB2010387A (en) * | 1977-12-14 | 1979-06-27 | Dowty Hydraulic Units Ltd | Swash Plate Machine |
| CN1203318A (en) * | 1997-06-25 | 1998-12-30 | 沙厄股份有限公司 | Retaining system for slipper holddown pins |
| CN1222655A (en) * | 1998-01-09 | 1999-07-14 | 沙厄股份有限公司 | Integral holddown pin mechanism for hydraulic power units |
| US20060174758A1 (en) * | 2003-03-19 | 2006-08-10 | Josef Beck | Pressure pin and axial piston machine having said pressure pin |
| CN101074656A (en) * | 2006-04-21 | 2007-11-21 | 沙厄-丹福丝股份有限公司 | Intagral slider pressing device |
-
2014
- 2014-12-10 CN CN201410753390.XA patent/CN105736353A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2776628A (en) * | 1952-07-10 | 1957-01-08 | Vickers Inc | Power transmission |
| GB2010387A (en) * | 1977-12-14 | 1979-06-27 | Dowty Hydraulic Units Ltd | Swash Plate Machine |
| CN1203318A (en) * | 1997-06-25 | 1998-12-30 | 沙厄股份有限公司 | Retaining system for slipper holddown pins |
| CN1222655A (en) * | 1998-01-09 | 1999-07-14 | 沙厄股份有限公司 | Integral holddown pin mechanism for hydraulic power units |
| US20060174758A1 (en) * | 2003-03-19 | 2006-08-10 | Josef Beck | Pressure pin and axial piston machine having said pressure pin |
| CN101074656A (en) * | 2006-04-21 | 2007-11-21 | 沙厄-丹福丝股份有限公司 | Intagral slider pressing device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160706 |