Block-crankcase tunnel type with integral cylindrical bearings for indigenous crankshaft journals

 

(57) Abstract:

Usage: machinery, reciprocating internal combustion engines. The inventive each cylindrical sliding bearing block crankcase is made of two parts with the annular grooves on the outer surface of the grease, installed with a clearance in the bore of the corresponding support tunnel block casing for rotation and fixed against movement in the axial direction of the retaining rings. 2 Il.

The invention relates to the field of engineering, namely for reciprocating internal combustion engines.

Known block-crankcase tunnel type with roller bearings for indigenous crankshaft journals. Indigenous shaft bearing are treadmills for roller bearing. The outer rings of the bearings are fixed in the axial direction in the bores of the block-crankcase retaining rings. The bearing of the first bearing with inner ring is persistent (See. for example, kN. "Diesels ZV S. Technical description". Ed. N 3/R-A7, S. 17, 25, S. 29, Fig. 7).

The disadvantages of the known constructions of block-crankcase are: the complexity of installation and installation of bearings on the crankshaft and in BC Ankeny resource work roller bearings, high accuracy and complexity of their manufacture; the complexity of the repair and restoration of the block-crankcase and crankshaft.

Known bearings for indigenous journals of a crankshaft mounted in a crankcase tunnel type with applications semicircular bases, liners cover connected blocks with the base, and the gland segment. The segment is made in two parts, which are symmetrically located relative to the vertical axis of the hole, the hinge connected to the lid and the spacer bolt, decompresses part of the segment in the tangential direction (see USSR author's certificate N 144348, F 16 C 9/02, F 16 M 1/022).

The main disadvantage of the known construction is the high complexity of the manufacture of the bearing, consisting of a large number of components which require joint processing.

In addition, the uneven pressure of the base and the segments of the bearing hole of the tunnel Carter do not prevent the formation of ovalization of the holes in the crankcase and have difficulty when mounting shaft.

Known bearings for indigenous journals of a crankshaft mounted in a crankcase tunnel type, the body of which consists of two halves, the degree is (see Express information "Piston and gas turbine engines", VINITI, No. 26, S. 1, Fig. 1).

Known design does not prevent ovalization holes tunnel block-crankcase, due to the unilateral pressure from the bolt, locking the bearing housing.

In addition, known methods of locking the bearing housings in the holes in the crankcase tunnel type exclude the possibility of installing different types of plain bearings or rolling on the principles of interchangeability, because it does not provide for locking the outer cone bearings, if they are installed against axial movement.

Block housings tunnel type with roller bearings for indigenous crankshaft journals are used for special high-speed diesel engines and have a relatively high manufacturing cost and low service life.

Known for the design of the block casing tunnel-type bearings for indigenous crankshaft journals, selected as a prototype, with a body consisting of three parts connected by bolts and inserts. The connector parts of the bearing housing is made of T-shaped gear and the housing is secured in the bore of the tunnel with one of cylind the use of thin-walled liners. The axial fixation of the bearing housing in the work achieved by the interference fit of the bearing in the bore of the tunnel (see, for example, and.with. USSR N 162004, F 16 C 9/02).

A disadvantage of known construction are: the complexity of manufacturing the bearing housing of three parts; the high complexity of Assembly and disassembly, as well as locking the bearing in the tunnel block-crankcase; design eliminates the possibility of optionally installed in the block-crankcase crankshaft roller bearings, because it does not provide for locking the outer cone bearings against axial movement.

The goal is to increase the service life of the engine, improving the mounting of the crankshaft, creating a block casing, suitable for installation in without any modifications, crankshaft with bearings and rolling.

The solution is achieved in block-crankcase tunnel type with integral cylindrical bearings for indigenous crankshaft journals and thin liners that each cylindrical sliding bearing is made of two parts with the annular grooves on the outer surface of the grease (for example, its facilities at the Moscow-292 ultradispersed diamond dust), installation from moving in the axial direction of the retaining rings. The set of essential features of the claimed invention, a sufficient and necessary to achieve provided by the invention the technical result of the task.

The invention is illustrated in the drawing, where:

in Fig. 1 shows a longitudinal section of the block casing tunnel-type crankshaft and bearings;

in Fig. 2 bearing, thin-walled liners.

In boring a tunnel block casing 1 has a crankshaft 2, which relies indigenous tails on several identical cylindrical bearings 3.

The bearings 3 mounted in the bore bearings tunnel block casing with a gap. In the axial direction of the bearings 3 are fixed retaining rings 4 within the bore bearings tunnel block crankcase. On the outer cylindrical surface of the bearing 3 has an annular groove 5, in which before installing the crankshaft 2 bearing 3 in block-crankcase laid plastic lubricant.

Indigenous neck when the engine is lubricated by oil flowing through drilling 6 in the crankshaft.

The bearing consists of two halves 7 and 8. In the lower half of the 8 screw two studs 9. the wines 7, 8 relative to each other set, the two pins 12. In the inner bore of the bearing halves make two liner 13 and 14. For fixing the inserts have a special bent antennae 15 and 16, which during Assembly are specially progresirovanie grooves of the bearing halves.

To maintain the required cylindrical shape of the inner and outer final bore of the bearing halves produce Assembly in active state (without liners).

The bearing Assembly and installation of the crankshaft as follows: at the root of the neck of the crankshaft 2 are mounted bearings 3 with inserts 13 and 14; they check for smooth rotation of the bearing 3 on the crankshaft 2; in the grooves 5 of the bearings 3 is laid plastic lubricant; block-crankcase 1 is heated to a temperature of 80-90oC (e.g. Strait of hot water); in the tunnel block casing 1 from the side opposite the transfer invested the crankshaft 2 bearing 3; bearings 3 are fixed in the axial direction of the retaining rings 4.

Due to the fact that between the bearings and bores of the tunnel block-crankcase there is a gap and the fact that the crank case is pre-heated, the mounting of the crankshaft needle bearing are fixed in the bores of the tunnel the block casing. To save the gap between the bores of the block-crankcase and bearings during operation of the engine block crank case and the outside of the bearing are made from the same material (in our case, cast iron RF-40).

The absence in the bores of the tunnel block-crankcase locking against rotation bearing device, the lack of influence of ovalization of the tunnel block-crankcase, and the use of retaining rings allows the same block crank case to install the crankshaft with bearings and rolling bearings, i.e., stored interchangeability.

During operation of the engine bearings will rotate in the bores of the tunnel block-crankcase at the rate of 1-2 rpm, equal to the rotation speed of the outer cone bearings.

Block-crankcase tunnel type with integral cylindrical bearings for indigenous crankshaft journals, including tocontinue liners, wherein each cylindrical sliding bearing is made of two parts with the annular grooves on the outer surface of the grease, installed with a clearance in the bore of the corresponding support tunnel block casing for rotation and fixed against movement of the

 

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