A brake drum for a vehicle includes a friction ring and a drum body. The friction ring has grooves arranged on a radial outer surface along a circumference, and a coating formed on the grooves. The drum body is cast onto the radial outer surface of the friction ring so that the grooves are filled with a material of the drum body. The grooves include first grooves and second grooves. A first axial segment is formed at the friction ring in which the first grooves are introduced so that the first grooves are inclined relative to a first axial end of the friction ring. A second axial segment is formed at the friction ring in which the second grooves are introduced so that the second grooves are inclined in a direction which is opposite to that of the first axial segment. Each of the grooves have undercuts.
Die casting molds for casting cylinder crankcases or crankcase subparts having a stationary molded part (10), in which, at least partially, a sprue system (26) for distributing the melt is formed, and movable molded parts (28, 29), in which, at least partially, a cavity (20) for forming a cylinder crankcase (34) or a crankcase subpart is formed, are known. In order to improve the microstructures,according to the invention, between the stationary molded part (10) and the movable molded parts (28, 29), an intermediate molded part (14) is arranged, which at least partially delimits the cavity (20) for forming the cylinder crankcase (34) or the crankcase subpart, and in which, at least partially, the sprue system (26) and a plurality of gates (22) are formed, which terminate in thick-walled areas (42) of the cylinder crankcase (34) or the crankcase subpart.
The invention relates to a brake drum for a vehicle comprising a friction ring (10), which has grooves (16, 18) on the radial outer surface (14) of the friction ring along the circumference and a coating (40) formed on the radial outer surface (14), and a drum body (12) which is cast onto the radial outer surface of the friction ring (10) such that the grooves (16, 18) are filled with the material of the drum body (12), wherein on the friction ring (10) a first axial segment (20) is formed, in which the grooves (16) are introduced with an inclination relative to the closest first axial end (24) of the friction ring (10) and a second axial segment (22) is formed, in which the grooves (18) are introduced with an inclination in the opposite direction to that of the first segment (20), wherein the grooves (16, 18) have undercuts (26, 32) when viewed in the radial direction.
The invention relates to a thermal spraying method and a device for coating the inner surface (24) of a cylinder (10) of an internal combustion engine or piston engine, the method comprising the following steps: - applying a thermal spray layer (24) to the inner surface (26) of the cylinder (10), and - optically detecting the surroundings (15) of the spray jet (13), namely a space outside the spray jet (13), by means of an optical sensor device (12). If the optical sensor device (12) detects particles of the spray material (14) supplied to the spray torch (11) in the monitored area (15) outside the spray jet (13), the coating process is assumed to be defective.
C23C 4/12 - Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
B05B 12/00 - Arrangements for controlling deliveryArrangements for controlling the spray area
B05B 13/06 - Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups specially designed for treating the inside of hollow bodies
B05B 7/22 - Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating the material to be sprayed electrically, e.g. by arc
The invention relates to a thermal spraying method and a device for coating the inner surface of a cylinder (10) of an internal combustion engine or piston engine, the method comprising the following steps: - applying a thermal spray layer (24) to the inner surface (26) of the cylinder (10), - inserting an optical sensor device (12) in the coated cylinder (10), and - scanning the coated inner surface (24) of the cylinder (10) by means of the optical sensor device (12) in order to detect ridges (14) in the coating (24).
G01N 21/954 - Inspecting the inner surface of hollow bodies, e.g. bores
B05B 13/06 - Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups specially designed for treating the inside of hollow bodies
G01N 21/84 - Systems specially adapted for particular applications
6.
Device for producing a cylinder crankcase using the low-pressure or gravity casting method
A device for producing a cylinder crankcase using a low-pressure casting method or a gravity casting method. The device includes an outer casting mold which includes at least one mold part which, in an assembled state, forms a mold cavity that reproduces, for casting purposes, an outer contour of the cylinder crankcase. A region of the mold cavity forms a cylinder space of the cylinder crankcase. A dosing furnace contains a liquid metal. At least one gate is arranged geodetically below the mold cavity and via which the dosing furnace can be fluidically connected to the mold cavity. Sprue bushings project into the region of the mold cavity that forms the cylinder space of the cylinder crankcase. Each of the at least one gate is connected to one of the sprue bushings.
B22D 18/04 - Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
B22D 15/02 - Casting using a mould or core of which a part significant to the process of high thermal conductivity, e.g. chill castingMoulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
B22C 9/08 - Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
B22D 15/04 - Machines or apparatus for chill casting
B22D 25/02 - Special casting characterised by the nature of the product by its peculiarity of shapeSpecial casting characterised by the nature of the product of works of art
B22D 31/00 - Cutting-off surplus material after casting, e.g. gates
B22D 35/04 - Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
B22D 37/00 - Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
7.
DEVICE FOR PRODUCING A CYLINDER CRANKCASE USING THE LOW-PRESSURE OR GRAVITY CASTING METHOD
Devices for producing cylinder crankcases (22) using the low-pressure casting or gravity casting method are already known, comprising an outer casting mould (10) having mould parts (12, 14, 16, 18) which in the assembled state form a mould cavity (20) that depicts for casting purposes an outer contour of the cylinder crankcase (22), a dosing furnace (28) which contains liquid metal, and at least one section (30) which is arranged geodetically below the mould cavity (20) and via which the dosing furnace (28) can be fluidically connected to the mould cavity (20). However, the cylinder crankcases produced by the known devices often do not have sufficient strength in the region of the bosses or the cylinder head. It is therefore proposed that each section (30) is connected to a sprue bush (34) which projects into a region of the mould cavity (20) that forms a cylinder space (24) of the cylinder crankcase (22). This improves the filling and allows replenishment of high-mass sections of the cylinder crankcase.
B22C 9/08 - Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
B22D 15/02 - Casting using a mould or core of which a part significant to the process of high thermal conductivity, e.g. chill castingMoulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
B22D 18/04 - Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
There are known methods for producing a cylinder running surface of a cylinder crankcase of an internal combustion engine in which a coating (30) is produced on a cylinder inner wall (24) of a cast cylinder crankcase by thermal spraying, and wherein an inert gas is used as the atomizer gas. However, the layers created are often susceptible to corrosion. In order to prevent this, it is proposed that the mass throughput of the coating material (15) in the thermal spraying is 8 to 22.5 kg/h. This provides a cylinder crankcase for an internal combustion engine with a cylinder running surface in which the sprayed-on coating (30) has a layer porosity of 4.5 to 25% and an oxide content of 0.5 to 5%. This coating has a high corrosion resistance.
C23C 4/12 - Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
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