SU63588A1 - The method of accurate boring of the main bearings of automobiles, tractor, etc. engines - Google Patents

Description

Precise boring of the main bearings allows the owl to get rid of scrap which is unacceptable for lead bronze bearings and undesirable for babbit bearings. Under the conditions of mass repair of engines it is impossible to provide with scraping the required accuracy to the speed of machining bearings. However, due to the lack of boring cTaiHKOB, scrapping is still used in stationary repair bases, even for swiveling rigs.

The manufacture of precision boring tools by conventional methods is practically not available for repair bases, since special boring lugs are required for machining the fixture and, in addition, it is necessary to make a model of the base of the fixture, to perform casting and to make aging casting. All this leads to a long production time.

The proposed method allows the simplest way to dry out, accurate bore of main bearings without special boring machines and relieves of difficulties.

associated with the manufacture of devices by conventional methods.

This is achieved by using the same crankcase with bored bearings as the constant station on which the machined crankcase is installed. In the latter, rotation and longitudinal feed of the boring bar is carried out.

The proposed method is illustrated in FIG. 1, showing the position of both crankcases during boring, as well as FIG. 2 and 3, depicting different positions of boring bars.

The essence of the method is to use, as a permanent frame for installing the processed crankcase, the same crankcase 1 (Fig. 1) as bored.

A boring crankcase 2 is superimposed on the frame-crankcase 1 so that the main supports of the crankcase 2 are inserted between the main supports of the crankcase 1. The crankcase 2 rests on four pushers 3. which protrude somewhat above the plane of the connector. At the same time, the axis of the main bearings that are not scored is still 4

will be higher than the axis of boring bar bearings, and the value of e (Fig. 3).

Bearings 5 of the boring bar have grooves that allow the boring bar 6 to be pushed in smoothly with the adjusted cutters. When the cam roller 7 is rotated, the pushers 3 are lowered and the crankcase 2 lies on the hell-out connector plane of the crankcase 1, which ensures the coincidence of the axes of the crankcase (Fig. 2). The mutual position of the crankcases is fixed by studs, the entrance w, by them into the basic holes of the crankcase 2.

The dragging and longitudinal feed of the boring rod is achieved by the simplest feed box, consisting of gears 8, 9 and 10. Gear 8 sits on the slide, it has a key 11. Gear 9 has a number of teeth one less than gear 8 and is connected screw thread with a roller 12.

Gears 8 and 9 are kept from longitudinal mixing, with the housing box body and driven from gear 10. Correct engagement of gears 8 and 9 with gear 10 is possible due to the slight difference in diameters of the initial circles of gears 8 and 9 (the corresponding number of gear teeth 8 , 9, for example. 120 and 119). When vrash.Vnii on the arrow, gear 9 behind the gear 8, made this longitudinal feed.

In the absence of a gear cutting machine, gear 9 can be performed by boring gear from the inside with the same number of teeth as gear 8, then cutting out one tooth and welding a cut gear. Shaft 12 and boring bar 6 are connected by checks.

The method also allows boring under the repair bed size under the main bearings.

Subject invention

The method of accurate boring of the main bearings of automobile, tractor, etc. engines with the help of boring bars; and by the fact that as the stationary bed on which the machined crankcase is installed, use the same crankcase with bored bearings in which the boring bar is rotated and longitudinally fed.