CN101504075B - Line contact type spherical hinge kinematic pair - Google Patents
Line contact type spherical hinge kinematic pair Download PDFInfo
- Publication number
- CN101504075B CN101504075B CN2009100259725A CN200910025972A CN101504075B CN 101504075 B CN101504075 B CN 101504075B CN 2009100259725 A CN2009100259725 A CN 2009100259725A CN 200910025972 A CN200910025972 A CN 200910025972A CN 101504075 B CN101504075 B CN 101504075B
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- Prior art keywords
- piston
- spherical
- connecting rod
- hole
- spherical crown
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
- F16J1/22—Connection to driving members with connecting-rods, i.e. pivotal connections with universal joint, e.g. ball-joint
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
The invention discloses a line contact spherical hinge moving pair, which comprises a connecting rod, a piston and an oil cylinder body, wherein a spherical crown on the top end of the connecting rod is contacted and matched with an inner ball socket in the piston; and the middle part on the top surface of the piston is provided with a balance oil hole which runs through the inner ball socket. The inner ball socket of the piston of the moving pair is a profile hole, an upper taper hole at the upper end of the piston is tangential to the spherical crown at the top of the connecting rod, the middle section of the piston is a spherical hole, and the lower end of the piston is a lower taper hole of which the upper end is tangential to the spherical hole at a parallel point in the center of the spherical crown. When the spherical crown of the connecting rod is matched with the upper taper hole of the piston, a distance H between the centers of the spherical crown and the upper taper hole is 0.5 to 1.2 millimeters, and the matching of the spherical crown and the upper taper hole is the contact between a straight line and a curve surface, and a line contact part is provided with a wedge corner; lubricating oil which enters from the balance oil hole is easy to form a wedged oil film at the wedge corner; and the wedged oil film directly improves the lubricating condition of a sphericalhinge structure and effectively avoids burning accidents caused by the lack of oil for the movement of the spherical hinge structure with a heavy load. The line contact spherical hinge moving pair keeps lubrication when carrying the heavy load, is flexible in rotation, less in heat productivity and long in service life, and is particularly suitable to be used as the spherical hinge structure of ahigh-power hydraulic motor.
Description
Technical field
The present invention relates to a kind of mechanical motion pair, particularly a kind of spherical hinge structure that is adapted at motion under the heavy load.
Background technique
The linkage structure of craspedodrome piston and swing connecting bar is spherical hinge structure in the dynamic power machine.The spherical hinge structure of prior art is that connection rod sphere contacts with ball-and-socket face in the piston, and surface of contact is big more between the two, and specific contact pressure is more little, shows that then this spherical hinge structure fit quality is good more.The traditional spherical hinge structure of this kind is widely used in the machinery powered by conventional energy, satisfies the transmission of power requirement fully.Along with manufacturing development, the equipment of maximization, heavy loading need be equipped with the power plant of corresponding power, the spherical hinge structure of prior art is applied in the high-power hydraulic transmission, the spherical hinge structure that is connected with piston because of connecting rod bears heavy load, between surface of contact, be difficult for setting up lubricant film, the heat that kinetic friction produces is difficult for leaving, the just very fast inefficacy of this spherical hinge structure under this operating mode, and the inefficacy form of expression mainly is that spherical hinge structure is killed mutually.
Summary of the invention
The present invention is primarily aimed at prior art is difficult for setting up lubricant film under the heavy load condition deficiency, propose a kind of simple in structure, easy to manufacture, enough lubricant films are arranged during heavy load, make rotate flexibly, heating value is few, the line contact type spherical hinge kinematic pair of long service life.
The present invention is achieved through the following technical solutions technical goal.
Line contact type spherical hinge kinematic pair, it comprises connecting rod, piston and cylinder body.Described connecting rod top is provided with the spherical crown that radius is Rg, and this spherical crown touches with piston endosphere socket and spigot joint and cooperates, the balance oil hole of ball-and-socket in the piston-top surface middle part is provided with and connects.Its improvements are: the interior ball-and-socket of described piston is an irregularly-shaped hole, the last taper hole and the connecting rod top spherical crown that are in the upper end are tangent, the spherical pore radius that is in the stage casing is Rw, and the bottom is a lower cone hole, and the lower cone hole upper end is tangent at the equal place, spherical crown center of connecting rod with spherical pore.When the spherical crown of described connecting rod cooperated with taper hole on the piston, the spherical crown radius R g center of connecting rod and spherical pore radius R w center were H=0.5～1.2mm apart.
In the said structure, the last taper hole and the connecting rod top spherical crown points of tangency of ball-and-socket in the piston are to the line formation cone tip angle of the centre of sphere, relative piston medial axis angle theta=20～30 °.The interior ball-and-socket stage casing spherical pore radius R w of piston is greater than spherical crown radius R g, Rw=1.05～1.3Rg.
The present invention compared with prior art has following good effect:
1, the last taper hole of the spherical crown of connecting rod and piston cooperate be straight line with curved surface between contact, this line contacting point has the angle of wedge, the lubricant oil that enters from balance oil hole easily forms wedge-shaped oil film at this, wedge-shaped oil film directly improves the lubricating condition of spherical hinge structure, and the spherical hinge structure motion is because of oil starvation generation sintering accident when effectively avoiding heavy duty;
2, the uncovered structure of ball-and-socket is than full subsumption architecture rapid heat dissipation in the piston, and under the wedge-shaped oil film condition, spherical hinge structure motion heating value is few;
3, the spherical inner hole of the epicone boring ratio prior art of piston easily shapes, and need not grinding process.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the prior art structural representation.
Embodiment
Below with reference to the accompanying drawings shown in and in conjunction with the embodiments, the invention will be further described.
Line contact type spherical hinge kinematic pair shown in the accompanying drawing 1, it comprises connecting rod 1, piston 2 and cylinder body 3.Described connecting rod 1 top is provided with the spherical crown that radius is Rg, and this spherical crown touches with piston 2 endosphere socket and spigot joints and cooperates, the balance oil hole 2.4 of ball-and-socket in the middle part on piston 2 tops is provided with and connects.The interior ball-and-socket of described piston 2 is an irregularly-shaped hole, and the last taper hole 2.1 and the connecting rod 1 top spherical crown that are in the upper end are tangent, angle theta=20～30 of the relative piston of tangent point 2 medial axis °.Spherical pore 2.2 radiuses that are in the stage casing are Rw, Rw=1.05～1.3Rg.The bottom is a lower cone hole 2.3, and lower cone hole 2.3 upper ends are tangent at the equal place, spherical crown center of connecting rod 1 with spherical pore 2.2.When the spherical crown of described connecting rod 1 cooperated with taper hole 2.1 on the piston 2, both centre distance was H=0.5～1.2mm.Present embodiment is that single flow is the piston 2 of 12.6L/r radial plunger type motor and the line contact type spherical hinge kinematic pair of connecting rod 1.
Connecting rod 1 top spherical crown radius R g=35mm wherein, the spherical pore 2.2 radius R w=37mm in the piston 2 in the ball-and-socket, Rw=1.06Rr.When the spherical crown of connecting rod 1 cooperated with taper hole 2.1 on the piston 2, the spherical crown radius R g center of connecting rod 1 and spherical pore 2.2 radius R w centers were at a distance of H=0.8mm.The last taper hole 2.1 of connecting rod 1 top spherical crown and piston 2 is tangent, angle theta=20 of the relative piston of tangent point 2 medial axis °.Under said structure and definite value parameter, the last taper hole 2.1 of the spherical crown of connecting rod 1 and piston 2 cooperates be straight line with curved surface between contact, this line contacting point has the angle of wedge, the lubricant oil that enters from balance oil hole 2.4 easily forms wedge-shaped oil film at this, wedge-shaped oil film directly improves the lubricating condition of spherical hinge structure, and the spherical hinge structure motion is because of oil starvation generation sintering accident when effectively avoiding heavy duty.In addition, ball-and-socket adopts uncovered structure in the piston 2 of the present invention, than the full subsumption architecture rapid heat dissipation of prior art shown in Figure 2, can not produce superheating phenomenon.Spherical hinge structure has good lubricating condition, rotates flexible, few, the long service life of heating value under fully loaded transportation condition.
Claims (3)
1. line contact type spherical hinge kinematic pair, it comprises connecting rod (1), piston (2) and cylinder body (3); Described connecting rod (1) top is provided with the spherical crown that radius is Rg, and this spherical crown touches with piston (2) endosphere socket and spigot joint and cooperates, the balance oil hole (2.4) of ball-and-socket in piston (2) end face middle part is provided with and connects; It is characterized in that: the interior ball-and-socket of described piston (2) is an irregularly-shaped hole, the last taper hole (2.1) that is in the upper end is tangent with connecting rod (1) top spherical crown, spherical pore (2.2) radius that is in the stage casing is Rw, the bottom is lower cone hole (2.3), and lower cone hole (2.3) upper end is tangent at the equal place, spherical crown center of connecting rod (1) with spherical pore (2.2); The spherical crown of described connecting rod (1) is gone up taper hole (2.1) when cooperating with piston (2), and the spherical crown radius R g center of connecting rod (1) and spherical pore (2.2) radius R w center are H=0.5～1.2mm apart.
2. line contact type spherical hinge kinematic pair according to claim 1, it is characterized in that: the last taper hole (2.1) of the interior ball-and-socket of described piston (2), with connecting rod (1) top spherical crown points of tangency, form the cone tip angle to the line of the centre of sphere, relatively angle theta=20～30 of piston (2) medial axis °.
3. line contact type spherical hinge kinematic pair according to claim 1 is characterized in that: interior ball-and-socket stage casing spherical pore (2.2) the radius R w of described piston (2) is greater than spherical crown radius R g, Rw=1.05～1.3Rg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100259725A CN101504075B (en) | 2009-03-16 | 2009-03-16 | Line contact type spherical hinge kinematic pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100259725A CN101504075B (en) | 2009-03-16 | 2009-03-16 | Line contact type spherical hinge kinematic pair |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101504075A CN101504075A (en) | 2009-08-12 |
| CN101504075B true CN101504075B (en) | 2010-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100259725A Expired - Fee Related CN101504075B (en) | 2009-03-16 | 2009-03-16 | Line contact type spherical hinge kinematic pair |
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| Country | Link |
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| CN (1) | CN101504075B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059708A (en) * | 2009-11-11 | 2011-05-18 | 鸿富锦精密工业（深圳）有限公司 | Spherical hinge |
| DE102012214146A1 (en) * | 2011-08-26 | 2013-02-28 | Schaeffler Technologies AG & Co. KG | Piston rod connection |
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2009
- 2009-03-16 CN CN2009100259725A patent/CN101504075B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101504075A (en) | 2009-08-12 |
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| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100728 Termination date: 20200316 |