Bimetal Steel Backed Leaded Bronze Bushing

Bimetallic steel backed lead bronze coating bush suitable for oil lubricated applications. This material has a high load capacity and good fatigue properties. It is widely used in automotive applications such as compressors, steering gear, power steering, pedal pads, kingpin bearings, tailgate pivots, mechanical handling and lifting equipment, hydraulic motors and pumps, agricultural machinery, etc.

Structure

1.Bi-metal Sintered bronze layer: Good wear resistance and excellent load carrying capacity.

2.Steel backing: Setting the foundation of the bushings,the steel backing provides exceptional stability, load carrying and heat dissipation characteristics.

Bimetal Bushing Technical

Technical Data
Bimetal Bushing		720 Bimetal Bushing	700 Bimetal Bushing	20 Bimetal Bushing
Data
Material type	CuPb10Sn10/ CuSn6Zn6Pb3	CuPb24Sn4	CuPb30	AlSn20Cu
Hardmess of bronze alloy	70~100HB	45~70HB	30~45HB	30~40HB
Max. dynamic Load	65N/mm	38N/mm	25N/mm	30N/mm2
“Mpa Sapphire” fatigue class	125	115	105	105
Friction coenncient(oil)	0.06~0.14	0.06~0.16	0.08~0.16	0.08~0.17
PV limit(Grease)	2.8N/mm .M/s	2.8N/mm .M/s	–	–
PV limit(Oil)	10N/mm .M/s	10N/mm .M/s	8N/mm .M/s	6N/mm2.M/s
Max. temperature	260 C	200 C	170 C	150oC
Load limit	150N/mm	130N/mm	120N/mm	100N/mm2
Speed limit v max.	5m/s	10m/s	15m/s	25m/s
Hardness of mating surface	53 HRC	50 HRC	270 HB	250 HB
Tensile strength	150N/mm	150N/mm	200N/mm	200N/mm2

Standard Bimetal Bushing Size

Cylindrical Bearing, Flange Bearing.

Non-Standard Size

Cylindrical Bearing, Flange Bearing, Thrust washer, Half bushing, Wear strips, Steel combined units.

Basic Introduction

The connecting rod group is composed of the connecting rod body, the connecting rod big head cover, the connecting rod small head bushing, the connecting rod big head bearing bush and the connecting rod bolt (or screw).The connecting rod group is subjected to the action of the gas force from the piston pin and its own swing and the reciprocating inertia force of the piston group. The magnitude and direction of these forces are periodic.Therefore, the connecting rod is subjected to alternating loads such as compression and tension.The connecting rod must have sufficient fatigue strength and structural stiffness.Fatigue strength is insufficient, often will cause the connecting rod body or connecting rod bolt fracture, and then produce the whole machine damage of major accidents.If the stiffness is insufficient, it will cause the bending deformation of the rod body and the out-of-round deformation of the big end of the connecting rod, recognized to the eccentric wear of the piston, cylinder, bearing and crank pin.

Structure composition

The connecting rod body is composed of three parts, the part connected with the piston pin is called the connecting rod head;The part connected with the crankshaft is called the connecting rod head, and the connecting rod body is called the connecting rod body.

The connecting rod head is mostly of thin-walled circular structure. In order to reduce the wear between the connecting rod and the piston pin, the thin-walled bronze bushing is pressed into the hole of the connecting rod head.Drill or mill grooves in the small head and bushing to allow the spatter to enter the mating surface of the lubricated bushing and piston pin.

Connecting rod body is a long rod, in the work of the force is large, in order to prevent its bending deformation, the rod body must have enough stiffness.For this reason, the connecting rod body of the vehicle engine mostly uses Ⅰ shaped section, the flat section can minimize the mass under the condition of sufficient stiffness and strength, and the high strengthening engine has the use of H shaped section.Some engines use connecting rod small head jet oil to cool the piston, must be drilled in the longitudinal shaft hole.In order to avoid stress concentration, the connecting rod body and the small head and large head are smooth transition by large circular arc.

In order to reduce the vibration of the engine, the quality difference of the connecting rod of each cylinder must be limited to the minimum range. When the engine is assembled in the factory, it is generally grouped according to the large and small head mass of the connecting rod in grams, and the same group of connecting rod is selected for the same engine.

V type engine, the left and right two columns of the corresponding cylinder share a crank pin, connecting rod has parallel connecting rod, fork connecting rod and main and auxiliary connecting rod three types.

Damage form

The main damage forms of connecting rod are fatigue fracture and excessive deformation.The common fatigue fracture site is the three high stress areas on the connecting rod.The working condition of the connecting rod requires that the connecting rod has higher strength and anti-fatigue performance.It also requires sufficient rigidity and toughness.In the traditional processing technology of connecting rod, the material is generally used 45 steel, 40Cr or 40MnB and other tempered steel, which has higher hardness. Therefore,New connecting rod materials produced by German automobile enterprises, such as C70S6 high-carbon micro-alloy non-quenched and tempered steel, Splitasco series forged steel, Fractim forged steel and S53CV-FS forged steel, etc. (all of the above are German DIN standards).Alloy steels have high strength but are sensitive to stress concentration.Therefore, strict requirements are needed in the shape of connecting rod and excessive fillet, and attention should also be paid to the surface machining quality to improve fatigue strength. Otherwise, the application of high strength alloy steel can not achieve the desired effect.

Bimetal Wrapped Steel With Bronze – Metric Size