Abstract:
This invention relates to a sheet metal poly-V-groove-pulley consisting of a cup-shaped material (3) having a circumferential wall (5) formed integrally with and extending at right angles from an end portion of a bottom wall (6), a poly-V-groove (10) formed in the outer circumferential surface of the circumferential wall (5) so as to be engaged with a poly-V-belt, and single-layer annular lugs (7, 9) extending from both end portions of the circumferential wall (5) in the radially outward direction and adapted to prevent the dislocation of a poly-V-belt from the pulley. During or before the formation of the ear (7), the inner side of the end portion of the circumferential wall (5) which is on the side of the bottom wall (6) is allowed to protrude in the radially inward direction to increase the thickness of the same end portion of the circumferential wall (5). Accordingly, even when a cup-shaped material (3) having a small wall thickness is used, the thickness of the end portion of the circumferential wall (5) which is on the side of the bottom wall (6) is secured, and problems including the strength of the poly-V-groove-pulley, material cost increase and weight increase can be solved.
Abstract:
A cylindrical sheet metal-made poly V-groove pulley suitable for press-fitting a one-way clutch and bearings into it, wherein V-belt locking lug parts of thick wall can be obtained easily, an axial linear part length on the inner diameter part of a peripheral wall part can be maintained, the lug parts (2, 2) for locking the V-belt formed by annularly extending them outward from both axial outer peripheral ends of a cylindrical peripheral wall part (1) comprises internal lug parts (2a) extended outward from both ends of the peripheral wall part (1) and external lug parts (2b) folded down from the extended outer ends of the lug parts (2a) to the outer surfaces of the internal lug parts (2a) so as to overlap them tightly, the inner end surfaces of the lug parts (2) are formed flush with the inner surface of the peripheral wall part (1), whereby the lug parts (2) can be made thicker by the overlapped structure of the internal lug parts (2a) and the external lug parts (2b), and the axial linear part length on the inner diameter part of the peripheral wall part (1) can be maintained by an amount of thickness of the external lug parts (2b).
Abstract:
A method of producing a poly-V groove pulley by sheet metal working. A ring-like peripheral wall, which is a thickened periphery of a substrate portion is clamped, and the ring-like peripheral wall is elongated so as to form a drum wall and a preparatory lug portion protruding from the base portion of the drum wall. Then a poly-V groove and a lug portion having a structure of a further protrusion of the preparatory lug portion are formed on the drum wall. According to this method, the lug portion is formed by forming in advance the preparatory lug portion and then allowing it to further protrude. Therefore, even when a sheet metal material is thin, the lug portion of a single layered-structure having a sufficient expansion quantity can be obtained.
Abstract:
The invention comprises a crankshaft damper (100) having an integral pulse ring (17). The crankshaft damper comprises an inner hub (110) and outer pulley (15) with an elastomeric connecting member (14) between each. The elastomeric ring dampens a crankshaft vibration. The integral pulse ring is manufactured as part of the inner hub by flow forming a sheet metal blank.
Abstract:
This invention relates to a method of manufacturing sheet metal poly-V-groove pulleys, consisting of the steps of bending a circumferential portion (2) of a circularly formed sheet metal material (1) so as to obtain a circular recessed or projecting product, flattening the bent portion of the product so that the bent portion is not radially extended, whereby the thickness of the circumferential portion (2) of the circularly formed sheet metal material (1) is increased, forming the thickness-increased sheet metal material (1) into a cup-shaped structure, and forming a poly-V groove (8, 10) in the outer surface of a circumferential wall (5) of this cup-shaped material (3); and products obtained by this method. The circularly formed sheet metal material (1) is thus subjected at its portion corresponding to the circumferential wall (5) of the cup-shaped material (3) to a thickness increasing operation. Accordingly, the thickness of the circumferential wall of the cup-shaped material (3) can be increased with a high efficiency by means of a simple press.
Abstract:
A method of manufacturing a poly-V-grooved pulley having formed therein two-stage poly-V-grooves with larger and smaller diameters, comprising the steps of forming a sectionally disc-shaped first formed body (25) having a support base plate (6) and a conical circumferential wall (24) continuously extending outward in an expandingly inclined shape from the outer circumferential edge of the support base plate (6) by bending a circular plate material (23) with a boss (5) at the center thereof, forming a second formed body (34) by spreading the conical circumferential wall (24) in an expanding edge direction, forming a diameter-reduced cylinder (3), a stepped part (7) and a diameter-enlarged cylinder (11) by drawing the thickness-reduced conical circumferential wall (24) of the second formed body (34), and finally forming by rolling a poly-V-grooves (2, 10) in the outer circumferential surfaces of the diameter-reduced cylinder (3) and the diameter-enlarged cylinder (11) respectively.
Abstract:
V-belt pulley comprising an outer rim (2) provided with at least one V-belt groove (7) formed by turning, said groove (7) having a bottom (9) provided with a plurality of radially through-going and circumferentially interspaced openings (8). The pulley is cast with a rim (2) having a radially inwardly facing surface (4) is provided with a plurality of circumferentially interspaced recesses (5) of such a radial depth that the radially through-going openings are formed by the turning thereof.
Abstract:
A method of forming a boss part sufficient in thickness and assured of a height of projection even when reduced in diameter, without excessively reducing the thickness of the metallic material and with the use of a small press, in which, through such processes as convexly bending a metallic material (1) in the form of a flat sheet, boring a hole (5A) in the top of said bent material, and bending that portion of said bent part between the peripheral part of said hole and the peripheral edge (1e) of the sheet in the direction reverse to that in the previous bending process while controlling radial outward stretch of the peripheral edge (1e) of the material (1), a cylindrical boss part (6) to project toward one side thereof is formed at the central part of the material (1).
Abstract:
Disclosed is a manufacturing method of a pulley, in which a base portion is partially cold-forged, whereby it is possible to facilely manufacture the compressor pulley and also improve strength of a bridge portion as well as the base portion. The method comprises a heating step Sl which heats a metallic material to a predetermined temperature; a hot- forging step S2 which forges the metallic material into a pulley shape; a center portion piercing step S3 which forms a through-hole; a cooling step S4 which cools the heated pulley to a room temperature; a rough grinding step S5 of the cooled pulley; a partially cold-forging step S6 which forges the base portion of the pulley at a room temperature; a slot piercing step S7 which forms a slot at the base portion; and a finishing step S8 in which groove working and grinding are performed on a surface of the pulley.