CN104728037A - Piston used for ball type hydraulic motor - Google Patents
Piston used for ball type hydraulic motor Download PDFInfo
- Publication number
- CN104728037A CN104728037A CN201510138917.2A CN201510138917A CN104728037A CN 104728037 A CN104728037 A CN 104728037A CN 201510138917 A CN201510138917 A CN 201510138917A CN 104728037 A CN104728037 A CN 104728037A
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- China
- Prior art keywords
- ball
- plunger body
- hydraulic motor
- piston
- socket
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/002—Reciprocating-piston liquid engines details; components parts
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Motors (AREA)
Abstract
The invention discloses a piston used for a ball type hydraulic motor. The piston comprises a plunger piston body (1), a steel ball (2), a ball cushion (4) and a bolt (16), wherein a hydrostatic pressure support (12), a screw hole (13) with a thread and a lower bottom hole (28) are formed in the plunger piston body (1); a plunger piston body bottom hole (6) is formed in a plunger piston body bottom (7) at the lower part of the plunger piston body (1); the lower bottom hole (28) is formed in the plunger piston body bottom hole (6); the screw hole (13) of the plunger piston body (1) is communicated with the hydrostatic pressure support (12) and the lower bottom hole (28) respectively; and the hydrostatic pressure support (12) is communicated with the bottom of a ball hole (15). The piston has excellent economy, is low in cost, and simple and convenient to machine; the contact area of the steel ball and the ball cushion is reduced and the friction is reduced; and the lubrication of the bottom of the steel ball is improved and the service life of the piston is prolonged.
Description
Technical field
The present invention relates to a kind of low friction steel ball piston, belong to the application of ball oil hydraulic motor.
Background technique
A kind of bulb stopper oil hydraulic motor has been invented in United Kingdom National engineering experiment room, and in this motor, each piston column cock body top ball-and-socket is built with baton round pad, and the recess of ball pad is equipped with steel ball, and this steel ball can roll on the guide rail of this oil hydraulic motor.When oil hydraulic motor runs, the hydraulic cylinder of oil hydraulic motor is relative with guide rail to be rotated, and this piston column cock body moves with the direction living reciprocating motion in hydraulic cylinder, and the steel ball in piston rolls on guide rail.For each piston, the thrust rib of baton round pad is set in the ball-and-socket at piston column cock body top, prevents ball pad from skidding off from plunger body top axis direction recess.
In prior art, be shaped by machining for limiting the thrust rib surface of steel ball, its manufacturing process is complicated, and manufacture cost is high, and especially machining accuracy is difficult to ensure card.Ball cushion material adopts injected plastics material, and when steel ball is slided on ball pad, surface friction drag is large, can cause steel ball operational difficulties, and heating is serious, forms ball pad and embraces steel ball phenomenon, make to become sliding movement when the guide rail of steel ball and motor runs, and then by rail damage.
F4 material is exactly teflon, is generally called " non-sticking lining " or " easy clean pot material "; It is a kind of Prof. Du Yucang macromolecular material employing fluorine and replace all hydrogen atoms in polyethylene.This material has the feature of antiacid alkali resistant, anti-various organic solvent, is dissolved in all solvents hardly.Meanwhile, teflon has resistant to elevated temperatures feature, and its friction factor is extremely low, has aging life-span best in plastics.High lubrication---be friction factor the lowest in solid material.Do not adhere to: be surface tension minimum in solid material, do not adhere to any material.
Summary of the invention
For the piston of ball oil hydraulic motor, it is characterized in that, the described piston for ball oil hydraulic motor comprises plunger body 1, steel ball 2, ball pad 4 and bolt 16, the top 14 of described plunger body 1 is provided with substantially horizontal and runs through plunger body 1 ball-and-socket 15, liquid static-pressure support 12 is had in described plunger body 1, screwed screw 13 and bottom bottom outlet 28, plunger body bottom outlet 6 is had on 7 bottom the plunger body of described plunger body 1 bottom, plunger body bottom outlet 6 has bottom bottom outlet 28, screw 13 in described plunger body 1 respectively with liquid static-pressure support 12, bottom bottom outlet 28 conducting, conducting bottom described liquid static-pressure support 12 and ball-and-socket 15, described liquid static-pressure support 12, screwed screw 13 and bottom bottom outlet 28 are about the axis of symmetry A Central Symmetry of plunger body 1, described ball pad 4 is the bowl structure of the lower hollow that the F4 composite material of low coefficient of friction is formed, be arranged in ball-and-socket 15, the outer convex spherical 9 of described ball pad 4 is close to the internal surface of ball-and-socket 15, steel ball 2 is placed on the interior concave spherical surface 8 of ball pad 4, the rib 11 of the bottom of described ball pad 4 is placed in the endoporus 18 of restriction ball pad 4 movement, the rib 11 of described ball pad 4 surrounds rib endoporus 17.
Described ball-and-socket 15 is semicircle, and the axis of symmetry A of home position at plunger body 1 and the infall of transverse axis B, the top of described ball-and-socket 15 is in same level, and overlaps with transverse axis B.
The outer convex spherical 9 of described ball pad 4 is fixed on the internal surface of ball-and-socket 15 by tackiness agent 10, the center line of described ball pad 4 overlaps with axis of symmetry A, and top is in same level, and overlaps with transverse axis B.
Described bolt 16 is arranged on screw 13.
Gap is left in the bottom of the rib 11 of described ball pad 4 and the bottom of liquid static-pressure support 12.
The bottom of described plunger body 1 also comprises circular groove 5.
Described ball-and-socket 15 top is provided with the bound edge 3 for limiting steel ball 2 movement in vertical direction, and described bound edge 3 is bent inwards to centre of sphere extruding by mould, is in the position pushing down steel ball 2.
The cross section of described bound edge 3 is cylinder section, cone cross section, the one in part-conical body section.
The cross section of described bound edge 3 is cylinder section, cone cross section, part-conical body section, respectively corresponding 3a type, 3b type, 3c type.
Advantage of the present invention is:
1) Economy is good, with low cost, processes easy;
2) reduce the area of contact of steel ball and ball pad, reduce friction, increasing action power, raises the efficiency;
3) improve the lubrication bottom steel ball, increase the working life of piston.
Accompanying drawing explanation
Fig. 1 is the structural section figure of the piston for oil hydraulic motor of assembling bolt 16;
Fig. 2 is the structural section figure of the piston for oil hydraulic motor of unassembled bolt 16;
Fig. 3 is the sectional view of ball pad 4;
The sectional view of Fig. 4 to be bound edge 3 be 3a type;
The sectional view of Fig. 5 to be bound edge 3 be 3b type;
The sectional view of Fig. 6 to be bound edge 3 be 3c type;
In figure: 1, plunger body, 2, steel ball, 3, bound edge, 4, ball pad, 5, circular groove, 6, plunger body bottom outlet, 7, plunger base, 8, interior concave spherical surface, 9, outer convex spherical, 10, tackiness agent, 11, rib, 12, liquid static-pressure support, 13, screw, 14, top, 15, ball-and-socket, 16, bolt, 17, rib endoporus, 18, endoporus, 28, bottom endoporus.
Embodiment
Illustrate below in conjunction with embodiment:
Embodiment 1, for the piston of ball oil hydraulic motor, comprise plunger body 1, steel ball 2, ball pad 4 and bolt 16, plunger body 1 is cylindrical body, top 14 is provided with substantially horizontal and runs through plunger body 1 ball-and-socket 15, liquid static-pressure support 12 is had in plunger body 1, screwed screw 13 and bottom bottom outlet 28, have plunger body bottom outlet 6 on 7 bottom the plunger body of plunger body 1 bottom, plunger body bottom outlet 6 have bottom bottom outlet 28, screw 13 in plunger body 1 respectively with liquid static-pressure support 12, bottom bottom outlet 28 conducting, conducting bottom liquid static-pressure support 12 and ball-and-socket 15.
Ball-and-socket 15 is semicircle, and the axis of symmetry A of home position at plunger body 1 and the infall of transverse axis B, the top of ball-and-socket 15 is in same level, and overlaps with transverse axis B.The outer convex spherical 9 of ball pad 4 is fixed on the internal surface of ball-and-socket 15 by tackiness agent 10, the center line of ball pad 4 overlaps with axis of symmetry A, and top is in same level, and overlaps with transverse axis B.
Bolt 16 is arranged on screw 13.Gap is left in the bottom of the rib 11 of ball pad 4 and the bottom of liquid static-pressure support 12.The bottom of plunger body 1 also comprises circular groove 5.
Ball-and-socket 15 top is provided with the bound edge 3 for limiting steel ball 2 movement in vertical direction, and bound edge 3 is bent inwards to centre of sphere extruding by mould, is in the position pushing down steel ball 2.The cross section of bound edge 3 is cylinder section, corresponding 3a type.
For the piston of ball oil hydraulic motor, the F4 composite material that ball pad 4 is placate by low friction forms, the outer convex spherical 9 of ball pad 4 is close in ball-and-socket 15, steel ball 2 is placed on the interior concave spherical surface 8 of ball pad 4, the rib 11 of ball pad 4 is placed in the endoporus 18 on plunger body 1 bottom ball-and-socket 15, and endoporus 18 is placed restrictions on ball pad 4 and moved in its hole.
The bound edge 3 at the top of plunger body 1, extrudes the centre of sphere of bound edge 3 to steel ball 2 with a mould, bound edge 3 is bent, pushes down steel ball 2, steel ball 2 can not be moved axially, but do not affect the rotation of steel ball 2.
There is screw 13 centre of plunger body 1, its upper end communicates with the endoporus 17 of rib 11 on ball pad 4, the lower end of screw 13 communicates with the bottom endoporus 28 of plunger body bottom outlet 6, construction bolt 16 in screw 13, ball pad 4 is arranged in the ball-and-socket 15 of plunger body 1, scribble elastic adhesive 10 at the outer convex spherical 9 of ball pad 4 and the surface of ball-and-socket 15, the existence of tackiness agent 10 makes to seal between them, makes ball pad 4 can not rotation in ball-and-socket 15 simultaneously.
When plunger body 1 is in the cylinder body of oil hydraulic motor, make the steel ball 2 in plunger body 1 on top 14 guide rail of plunger body 1, make substantially horizontal by the input of hydraulic oil and slide.Hydraulic oil is under the effect of hydraulic coupling, enter the slot between bolt 16 and screw 13, enter ball rebasing portion endoporus 17 to make between steel ball 2 and ball pad 4, to form a liquid static-pressure support 12, it makes the friction system between steel ball 2 and ball pad 4 reduce, improve the mechanical efficiency of oil hydraulic motor, do not affect again the volumetric efficiency of oil hydraulic motor.
Plunger body 1 is mounted in the hole of the cylinder body of oil hydraulic motor, when pressurized hydraulic oil enters cylinder body, the hydraulic coupling P of hydraulic oil makes the steel ball 2 on plunger body 1 top 14 withstand the guide rail of oil hydraulic motor, plunger body 1 is made to produce a tangential force by steel ball 2 and guide rail, this tangential force makes plunger body 1 drive the cylinder body of oil hydraulic motor to move, and makes plunger body 1 move up and down in cylinder body simultaneously.Steel ball 2 and guide rail are done to roll and are rotated, and the coefficient of rolling friction of their Contact is F1.Steel ball 2 concave spherical surface 8 in ball pad 4 does running of sliding, and this is to the coefficient of sliding friction F2 of contact object.Oil hydraulic motor is run well, and coefficient of sliding friction F1 is less than coefficient of rolling friction F2.
Ball pad 4 and steel ball 2 that F4 composite material does, its friction factor 2-3 order of magnitude lower than dry friction coefficient under the lubrication of flow stream pressure oil, PV value raising 1 ~ 2 order of magnitude of its pressure P and speed V, extreme pressure PV value is greater than 135 ~ 150Mpa.m/s, minimized friction coefficient is 0.002, and its abrasion loss is than falling the end 3 ~ 5 order of magnitude during dry friction.
The pressure oil that liquid static-pressure support 12 relies on oil hydraulic motor to input as fluid pressure source to the fluid supplying certain pressure between friction surface, carry by liquid static-pressure support body static pressure, thus hydrostatic support operationally, no matter remain static by the element supported, still be in motion state, have one deck lubricant film to be separated by the working surface of friction pair.
Liquid static-pressure support 12 has very little friction factor compared with rolling bearing, sliding bearing.Its advantage is;
1) speed is extremely low also can start when being even zero under liquid lubrication, and coefficient of starting friction is little, and this is to requiring that the oil hydraulic motor be applied on vehicle carries, through be everlasting level land and slope is started, braking operation time advantageous particularly;
2) oil hydraulic motor worked under making to be in liquid lubrication state, greatly reduces wearing and tearing during normal use, increases long service life;
3) friction factor is at low speeds at 0.001-0.003, almost nil, than rolling friction or little many of sliding friction, improves the mechanical efficiency of oil hydraulic motor.
Claims (8)
1. for the piston of ball oil hydraulic motor, it is characterized in that, the described piston for ball oil hydraulic motor comprises plunger body (1), steel ball (2), ball pad (4) and bolt (16), the top (14) of described plunger body (1) is provided with substantially horizontal and runs through plunger body (1) ball-and-socket (15), liquid static-pressure support (12) is had in described plunger body (1), screwed screw (13) and bottom bottom outlet (28), bottom the plunger body of described plunger body (1) bottom, (7) there is plunger body bottom outlet (6), plunger body bottom outlet (6) has bottom bottom outlet (28), screw (13) in described plunger body (1) respectively with liquid static-pressure support (12), bottom bottom outlet (28) conducting, described liquid static-pressure support (12) and ball-and-socket (15) conducting, described liquid static-pressure support (12), screwed screw (13) and bottom bottom outlet (28) are about the axis of symmetry A Central Symmetry of plunger body (1), the bowl structure of the lower hollow that the F4 composite material that described ball pad (4) is low coefficient of friction is formed, be arranged in ball-and-socket (15), the outer convex spherical of described ball pad (4) (9) is close to the internal surface of ball-and-socket (15), steel ball (2) is placed on the interior concave spherical surface (8) of ball pad (4), the rib (11) of the bottom of described ball pad (4) is placed in the endoporus (18) of restriction ball pad (4) movement, the rib (11) of described ball pad (4) surrounds rib endoporus (17).
2. the piston for ball oil hydraulic motor according to claim 1, it is characterized in that, described ball-and-socket (15) is semicircle, the axis of symmetry A of home position at plunger body (1) and the infall of transverse axis B, the top of described ball-and-socket (15) is in same level, and overlaps with transverse axis B.
3. the piston for ball oil hydraulic motor according to claim 1, it is characterized in that, the outer convex spherical (9) of described ball pad (4) is fixed on the internal surface of ball-and-socket (15) by tackiness agent (10), the center line of described ball pad (4) overlaps with axis of symmetry A, top is in same level, and overlaps with transverse axis B.
4. the piston for ball oil hydraulic motor according to claim 1, is characterized in that, described bolt (16) is arranged on screw (13).
5. the piston for ball oil hydraulic motor according to claim 1, is characterized in that, gap is left in the bottom of the rib (11) of described ball pad (4) and the bottom of liquid static-pressure support (12).
6. the piston for ball oil hydraulic motor according to claim 1, is characterized in that, the bottom of described plunger body (1) also comprises circular groove (5).
7. the piston for ball oil hydraulic motor according to claim 1, it is characterized in that, described ball-and-socket (15) top is provided with the bound edge (3) for limiting steel ball (2) movement in vertical direction, described bound edge (3) is bent inwards to centre of sphere extruding by mould, is in the position pushing down steel ball (2).
8., according to the arbitrary described piston for ball oil hydraulic motor of claim 1 or 7, it is characterized in that, the cross section of described bound edge (3) is cylinder section, cone cross section, the one in part-conical body section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510138917.2A CN104728037A (en) | 2015-03-27 | 2015-03-27 | Piston used for ball type hydraulic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510138917.2A CN104728037A (en) | 2015-03-27 | 2015-03-27 | Piston used for ball type hydraulic motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104728037A true CN104728037A (en) | 2015-06-24 |
Family
ID=53452308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510138917.2A Pending CN104728037A (en) | 2015-03-27 | 2015-03-27 | Piston used for ball type hydraulic motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104728037A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320728A (en) * | 2020-09-28 | 2022-04-12 | 大同金属工业株式会社 | Bearing arrangement for radial piston machine |
| CN114320729A (en) * | 2020-09-28 | 2022-04-12 | 大同金属工业株式会社 | Bearing arrangement for radial piston machine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4718803U (en) * | 1971-04-02 | 1972-11-02 | ||
| JPS5257503A (en) * | 1975-11-07 | 1977-05-12 | Hitachi Constr Mach Co Ltd | Hydraulic pressure pump motor |
| US4043255A (en) * | 1970-09-02 | 1977-08-23 | National Research Development Corporation | Cam follower piston |
| JPH0370876A (en) * | 1989-08-08 | 1991-03-26 | Mannesmann Rexroth Gmbh | Piston for multistroke piston machine |
| CN202266368U (en) * | 2011-09-29 | 2012-06-06 | 宁波市北仑广源液压有限公司 | Hydraulic motor piston with thickened rim |
| DE102011012306A1 (en) * | 2011-02-25 | 2012-09-27 | Robert Bosch Gmbh | Radial piston engine i.e. hydraulic motor, has hydrostatic release-unit comprising aperture that is connected to working chamber of cylinder-piston unit, and grooves extending from aperture to roller and provided at piston in contact region |
| CN103201513A (en) * | 2010-07-23 | 2013-07-10 | 罗伯特·博世有限公司 | Radial piston machine and piston for a radial piston machine of this type |
| CN204691983U (en) * | 2015-03-27 | 2015-10-07 | 上海市闸北区物流工程技术研究所 | For the piston of ball oil hydraulic motor |
-
2015
- 2015-03-27 CN CN201510138917.2A patent/CN104728037A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4043255A (en) * | 1970-09-02 | 1977-08-23 | National Research Development Corporation | Cam follower piston |
| JPS4718803U (en) * | 1971-04-02 | 1972-11-02 | ||
| JPS5257503A (en) * | 1975-11-07 | 1977-05-12 | Hitachi Constr Mach Co Ltd | Hydraulic pressure pump motor |
| JPH0370876A (en) * | 1989-08-08 | 1991-03-26 | Mannesmann Rexroth Gmbh | Piston for multistroke piston machine |
| CN103201513A (en) * | 2010-07-23 | 2013-07-10 | 罗伯特·博世有限公司 | Radial piston machine and piston for a radial piston machine of this type |
| DE102011012306A1 (en) * | 2011-02-25 | 2012-09-27 | Robert Bosch Gmbh | Radial piston engine i.e. hydraulic motor, has hydrostatic release-unit comprising aperture that is connected to working chamber of cylinder-piston unit, and grooves extending from aperture to roller and provided at piston in contact region |
| CN202266368U (en) * | 2011-09-29 | 2012-06-06 | 宁波市北仑广源液压有限公司 | Hydraulic motor piston with thickened rim |
| CN204691983U (en) * | 2015-03-27 | 2015-10-07 | 上海市闸北区物流工程技术研究所 | For the piston of ball oil hydraulic motor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320728A (en) * | 2020-09-28 | 2022-04-12 | 大同金属工业株式会社 | Bearing arrangement for radial piston machine |
| CN114320729A (en) * | 2020-09-28 | 2022-04-12 | 大同金属工业株式会社 | Bearing arrangement for radial piston machine |
| CN114320729B (en) * | 2020-09-28 | 2024-01-19 | 大同金属工业株式会社 | Bearing device of radial piston device |
| CN114320728B (en) * | 2020-09-28 | 2024-04-16 | 大同金属工业株式会社 | Bearing device of radial piston device |
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Application publication date: 20150624 |
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