Compensating shaft assembly for piston engines
AssigneeSteyr Powertrain AG & Co KG
InventorJohann Stuckler
Life of this patent
Estimating the term…
Abstract
A balance shaft unit for internal combustion engines consists of at least one balance shaft (6, 7) supported in a balance casing (5) and counterweights (8) connected onto it. In order to achieve maximum precision, reliable fastening and minimum external dimensions at minimum manufacturing costs, the counterweight (8) is essentially a cylindrical ring with two end surfaces (61) normal to the axis and with a cutout (55) in the longitudinally central region, so that the counterweight consists of two ring parts (60, 61) abutting the two end surfaces (61) and an intermediate segmental part (62). One of the end surfaces (61) of the counterweight (8) forms, jointly with a machined surface (33) of the balance casing (5), a thrust bearing (32).
Claims12
A balance shaft unit for an internal combustion engine comprising:
- at least one balance shaft (6, 7) supported in a balance casing (5) along an axis on bearing surfaces (31) of a plurality of friction bearings (30) wherein the bearing surfaces (31) are formed in the balance casing (5) itself;
- at least one counterweight (8) fastened to the balance shaft (6, 7), the counterweight comprises two spaced apart ring parts (59, 60) extending normal to the axis and define therebetween an intermediate segmental part (62) and a cutout (55), the two spaced apart ring parts (59, 60) each have an end surface (61) wherein one of the end surfaces (61) on one of the ring parts (59, 60) form a thrust bearing (32) with a machined surface (33) of the balance casing (5) at a location proximate to bearing surface (31).
A balance shaft unit for internal combustion engines, consisting of at least one balance shaft (6, 7) supported in a balance casing (5) and at least one counterweight (8) fastened to the balance shaft, characterized in that the counterweight (8) is essentially a cylindrical ring with two end surfaces (61) normal to the axis and with a cutout (55) in the longitudinally central region, so that the counterweight consists of two ring parts (60, 61) abutting the two end surfaces (61) and an intermediate segmental part (62), wherein the counterweight (8) is connected to the balance shaft (6, 7) by a high-energy welded seam (35, 35′) in the cutout (55), which high-energy welded seam (35, 35′) is produced on both sides at the intersection of a cutout plane (56, 57) with the balance shaft (6, 7).
Dependencies are inferred from the claim text.