CN109458399A - A kind of circumferential change wall thickness bearing shell - Google Patents

A kind of circumferential change wall thickness bearing shell Download PDF

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Publication number
CN109458399A
CN109458399A CN201910029953.3A CN201910029953A CN109458399A CN 109458399 A CN109458399 A CN 109458399A CN 201910029953 A CN201910029953 A CN 201910029953A CN 109458399 A CN109458399 A CN 109458399A
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China
Prior art keywords
bearing
groove
wall thickness
bearing shell
change wall
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Pending
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CN201910029953.3A
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Chinese (zh)
Inventor
李玩幽
刘冲培
卢熙群
赵滨
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Harbin Engineering University
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Harbin Engineering University
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Priority to CN201910029953.3A priority Critical patent/CN109458399A/en
Publication of CN109458399A publication Critical patent/CN109458399A/en
Pending legal-status Critical Current

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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C37/00—Cooling of bearings
    • F16C37/002—Cooling of bearings of fluid bearings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mechanical Engineering (AREA)
  • Pure & Applied Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Theoretical Computer Science (AREA)
  • Operations Research (AREA)
  • Algebra (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

The purpose of the present invention is to provide a kind of circumferential change wall thickness bearing shell, lower bearing inner surface is machined with the groove that a molded line is cosine function curve.The groove covers entire lower bearing inner surface, and the maximum value d of depth of groovemWith the ratio between bearing bush radius projection gap c dm/ c is 0.03~0.3.Geometric gap invention increases bearing in supporting region reduces bearing maximum temperature to increase bearing minimum oil film thickness, while reducing bearing friction power.This extends the service life of bearing, improves diesel engine reliability of operation and durability.

Description

A kind of circumferential change wall thickness bearing shell
Technical field
The present invention relates to a kind of sliding bearings, the specifically bearing shell of sliding bearing.
Background technique
Sliding bearing is one of friction pair important in diesel engine, and greasy property is directly related to the reliability of diesel engine With durability.Under severe duty, bearing minimum oil film thickness can be significantly reduced, and bearing is in a higher work temperature at this time Degree, bearing friction power are also larger.This severe exacerbation lubrication state of bearing, shortens the service life of bearing, reduces bavin Oil machine reliability of operation and durability.
Summary of the invention
The purpose of the present invention is to provide a kind of circumferential change wall thickness bearing shells for being able to extend bearing service life.
The object of the present invention is achieved like this:
A kind of circumferential change wall thickness bearing shell of the present invention, it is characterized in that: it is cosine letter that lower bearing inner surface, which is machined with a molded line, The groove of number curve.
The present invention may also include:
1, the groove covers entire lower bearing inner surface, and the maximum value d of depth of groovemWith bearing bush radius projection gap c it Compare dm/ c is 0.03~0.3.
2, the curved dies of groove areIn formula, θ is the circumferential angle of bearing Degree, and 0 π of < θ≤2.
Present invention has an advantage that invention increases bearing supporting region geometric gap, to increase bearing most Small oil film thickness reduces bearing maximum temperature, while reducing bearing friction power.This extends the service life of bearing, mentions High diesel engine reliability of operation and durability.
Detailed description of the invention
Fig. 1 a is conventional bearing shell schematic diagram, and Fig. 1 b is A-A schematic diagram；
Fig. 2 a is structural schematic diagram of the invention, and Fig. 2 b is B-B schematic diagram；
Fig. 3 a is bearing minimum oil film thickness hminWith dmThe changing rule of/c, Fig. 3 b are bearing maximum temperature TmaxWith dm/c Changing rule, Fig. 3 c be bearing friction power f with dmThe changing rule of/c.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
In conjunction in Fig. 1 a- Fig. 3 c, Fig. 1 a, B is plain bushing width, and d is plain bushing thickness.In Fig. 2 a, in lower bearing Inner surface processes the groove that a molded line is cosine function curve, and groove covers entire lower bearing inner surface.If depth of groove Maximum value be dm, then the curved dies of groove be
In formula, θ is the circumferential angle of bearing, and 0 π of < θ≤2.
Using certain Crankshaft of Marine Diesel Engine base bearing as research object, it is based on hot fluid lubrication theory, has studied circumferential change wall Affecting laws of the thick bearing shell to bearing lubrication performance.
The generalized Reynolds equation that its lubricating status is described for crankshaft of diesel engine base bearing, under lower state is
In formula, R is bearing radius, and p oil film pressure, U journal surface linear velocity, σ is the composite roughness on two surfaces, φθ Circumferential pressure flow factor, φyAxial compressive force flow factor, φsShear flow factor, hTRandom oil film thickness, ρlLubricating oil is close Degree, F0,F1,F2Lubricating oil viscosity function.
The oil film pressure of boundary is calculated using Reynolds boundary condition, specially
In formula, paFor environmental pressure, psCharge oil pressure, Γ oil groove boundary.
Asperity contact pressure P between bearing shell and axle journalaspFor
Pasp=KEF2.5(h/σ)
In formula, K is coefficient of elasticity；E is synthetical elastic modulus；And F2.5(h/ σ) indicates the distribution in the case of different film thickness ratios Function.
The energy equation of control oil film Temperature Distribution is under lower state
In formula, cl,kl,ρlFor the specific heat, thermal coefficient, density of lubricating oil, u, v, w lubricating oil is along θ to, y to, z to stream Speed, μaspDry friction coefficient between axle journal, two surface of bearing shell.
The equation of heat conduction that bearing shell Temperature Distribution is controlled under lower state can be expressed as under cylindrical coordinate
In formula, cb,kb,ρbFor the specific heat of bearing shell, density, thermal coefficient, rbBearing shell radial coordinate.
The boundary that bearing shell is contacted with environment is converctive heat transfer boundary
In formula, hbFor the convection transfer rate between bearing shell surface and air, T0Environment temperature, n indicate the method for contact surface To.
Bearing shell-oil film interface boundary is heat flow continuum boundary
It is circumferentially temperature-resistant that axle journal-lubricating oil boundary meets axle journal, and circumferential net heat flow is zero
Oil tank boundary is that oil film temperature meets quadratic polynomial distribution, and bearing bush temperature meets a multinomial distribution
Flume outlet boundary is that meet temperature gradient be null boundary condition to oil film temperature, and bearing bush temperature meets free convection side Boundary's condition
In formula, houtFor the heat transfer coefficient in bearing shell exit.
The calculation formula of bearing friction power f is
In formula, φf,φfs,φfpFor the shear stress factor.
Using finite difference calculus discrete generalized Reynolds equation, oil film energy equation and the bearing shell equation of heat conduction, in conjunction with Corresponding boundary condition solves oil film pressure field and bearing temperature field with correlation criteria.As a result as shown in figure 3, wherein dm/ c=0 Corresponding to plain bushing.The circumferential wall thickness bearing shell that becomes increases bearing minimum oil film thickness it can be seen from Fig. 3 a-c, reduces axis Maximum temperature is held, while reducing bearing friction power.

Claims (3)

1. a kind of circumferential change wall thickness bearing shell, it is characterized in that: it is cosine function curve that lower bearing inner surface, which is machined with a molded line, Groove.
2. a kind of circumferential change wall thickness bearing shell according to claim 1, it is characterized in that: the groove covers in entire lower bearing Surface, and the maximum value d of depth of groovemWith the ratio between bearing bush radius projection gap c dm/ c is 0.03~0.3.
3. a kind of circumferential change wall thickness bearing shell according to claim 1, it is characterized in that: the curved dies of groove areIn formula, θ is the circumferential angle of bearing, and 0 π of < θ≤2.
CN201910029953.3A 2019-01-11 2019-01-11 A kind of circumferential change wall thickness bearing shell Pending CN109458399A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910029953.3A CN109458399A (en) 2019-01-11 2019-01-11 A kind of circumferential change wall thickness bearing shell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910029953.3A CN109458399A (en) 2019-01-11 2019-01-11 A kind of circumferential change wall thickness bearing shell

Publications (1)

Publication Number Publication Date
CN109458399A true CN109458399A (en) 2019-03-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910029953.3A Pending CN109458399A (en) 2019-01-11 2019-01-11 A kind of circumferential change wall thickness bearing shell

Country Status (1)

Country Link
CN (1) CN109458399A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0445472A1 (en) * 1990-03-02 1991-09-11 Morgan Construction Company Bushing for oil film bearing
CN102400999A (en) * 2010-09-16 2012-04-04 重庆长安汽车股份有限公司 Bearing bush of engine crank link mechanism
CN202707787U (en) * 2012-05-28 2013-01-30 石家庄金士顿轴承科技有限公司 Dynamic pressure sliding oil film bearing
CN203488554U (en) * 2013-09-17 2014-03-19 北汽福田汽车股份有限公司 Bearing bush and engine with same
JP2016161015A (en) * 2015-02-27 2016-09-05 大豊工業株式会社 Slide bearing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0445472A1 (en) * 1990-03-02 1991-09-11 Morgan Construction Company Bushing for oil film bearing
CN102400999A (en) * 2010-09-16 2012-04-04 重庆长安汽车股份有限公司 Bearing bush of engine crank link mechanism
CN202707787U (en) * 2012-05-28 2013-01-30 石家庄金士顿轴承科技有限公司 Dynamic pressure sliding oil film bearing
CN203488554U (en) * 2013-09-17 2014-03-19 北汽福田汽车股份有限公司 Bearing bush and engine with same
JP2016161015A (en) * 2015-02-27 2016-09-05 大豊工業株式会社 Slide bearing

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Application publication date: 20190312

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