Abstract: A dust cover for a ball joint is made up of a dust cover body made of a rubber elastic material and an annular plate member. In the dust cover body, a reinforcement ring is disposed in a stud mounting part, and an annular step is disposed on the inner peripheral side of the reinforcement ring. The plate member is made up of a plate body and an annular sealing part that is made of a rubber elastic material and is accommodated in the annular step. In the outer periphery of the plate body, a plurality of cut parts are formed, so that outer peripheral petal parts are formed between adjacent cut parts to be capable of being bent so as to be engaged with a knuckle groove.

Abstract: A dust cover and a sealing structure with which a sealing performance is improved while limiting an increase in a number of components. A seal portion 120 includes an inner peripheral seal portion having a plurality of annular projecting portions configured to slide on an outer peripheral surface of a shaft 310, and a dust seal portion configured to slide on an end face of a knuckle 400. A projecting portion 121c located furthest toward a first end side, and configured to project toward the first end side, is formed by an annular recessed part 123, which is recessed from an end face of the seal portion on the first end side 120a toward a second end side, and a part of an inner peripheral surface of the seal portion 120, and an inner peripheral surface of the projecting portion 121c is in close contact with a collar 311 and configured to slide along an outer peripheral surface thereof.

Abstract: A dust cover for a ball joint has a spherical head portion, a shaft, a cylindrical one-end large-diameter opening portion, a large-diameter opening portion side reinforcing ring fixed to a socket, the other end small-diameter opening portion retained onto the shaft, a flange portion extending from an end portion in the other-end small-diameter opening portion of the one-end large-diameter opening portion toward a ball stud side, and a rubber-like elastic film portion coupling an inward end portion of the flange portion and the other-end small-diameter opening portion. The dust cover has an outside projection provided on an outer peripheral surface of the film portion, and an inside projection provided on an inner peripheral surface of a joint portion between the flange portion and the film portion, and the outside projection and the inside projection come into contact with each other when the dust covers for the ball joint are laminated.

Abstract: A dust cover in which an improvement in sealing performance is achieved. A dust cover 100 used in a ball joint includes a seal main body made of an elastic body and integrally having a body portion 110, a fixed portion 130 that is provided on one end side of the body portion 110, and a seal portion 120 that is provided on the other end side of the body portion 110, and an annular auxiliary seal 150 made of resin and provided in the seal portion 120. The seal portion 120 includes an inner peripheral seal portion and a dust lip 122, and the auxiliary seal 150 includes an auxiliary inner peripheral seal portion 151, an auxiliary dust seal portion, and a supported portion 153 that is supported by a collar fixed to a shaft portion on an opposite side to the auxiliary dust seal portion in an axial direction.

Abstract: A dust cover in which an improvement in sealing performance is achieved. A dust cover 100 used in a ball joint includes a seal main body made of an elastic body and integrally having a body portion 110, a fixed portion 130 that is provided on one end side of the body portion 110, and a seal portion 120 that is provided on the other end side of the body portion 110, and an annular auxiliary seal 150 made of resin and provided in the seal portion 120. The seal portion 120 includes an inner peripheral seal portion and a dust lip 122, and the auxiliary seal 150 includes an auxiliary inner peripheral seal portion 151, an auxiliary dust seal portion, and a supported portion 153 that is supported by a collar fixed to a shaft portion on an opposite side to the auxiliary dust seal portion in an axial direction.

Abstract: A dust cover for a ball joint has a spherical head portion, a shaft, a cylindrical one-end large-diameter opening portion, a large-diameter opening portion side reinforcing ring fixed to a socket, the other end small-diameter opening portion retained onto the shaft, a flange portion extending from an end portion in the other-end small-diameter opening portion of the one-end large-diameter opening portion toward a ball stud side, and a rubber-like elastic film portion coupling an inward end portion of the flange portion and the other-end small-diameter opening portion. The dust cover has an outside projection provided on an outer peripheral surface of the film portion, and an inside projection provided on an inner peripheral surface of a joint portion between the flange portion and the film portion, and the outside projection and the inside projection come into contact with each other when the dust covers for the ball joint are laminated.

Abstract: In a dust cover for a ball joint in which a one end large-diameter opening portion is retained to an outer peripheral surface of a socket, the other end small-diameter opening portion is constructed by a tube portion fitted and fixed onto an outer peripheral surface of a shaft, and an outward flange portion extending diametrically outward from an end portion in the socket side of the tube portion, and the dust cover is retained onto a L-shaped hard retainer, a reinforcing ring of the other end small-diameter opening portion is constructed by a cylindrical portion and an inward flange portion extending toward an outer peripheral surface of the retainer from an end portion in the knuckle side of the cylindrical portion, and an end portion in the socket side of the cylindrical portion in the reinforcing ring comes into contact with the outward flange portion of the retainer.

Abstract: In a dust cover for a ball joint, a reinforcing ring is buried in a shaft side attaching portion which is closely fitted and fixed to an outer peripheral surface of a shaft portion of a ball stud of the ball joint, a first inner peripheral projection and a second inner peripheral projection are formed at different axial positions in the reinforcing ring at predetermined intervals in a circumferential direction, the first inner peripheral projection and the second inner peripheral projection having diameters which are slightly greater than an inner peripheral surface of the shaft side attaching portion in their end portions in an inner diameter side as well as extending to the inner diameter side, and the first inner peripheral projection and the second inner peripheral projection exist on phases which do not lap over each other in an axial direction, thereby preventing tracking property reduction.

Abstract: In a dust cover for a ball joint in which a one end large-diameter opening portion is retained to an outer peripheral surface of a socket, the other end small-diameter opening portion is constructed by a tube portion fitted and fixed onto an outer peripheral surface of a shaft, and an outward flange portion extending diametrically outward from an end portion in the socket side of the tube portion, and the dust cover is retained onto a L-shaped hard retainer, a reinforcing ring of the other end small-diameter opening portion is constructed by a cylindrical portion and an inward flange portion extending toward an outer peripheral surface of the retainer from an end portion in the knuckle side of the cylindrical portion, and an end portion in the socket side of the cylindrical portion in the reinforcing ring comes into contact with the outward flange portion of the retainer.

Abstract: In an elastic ball joint dust cover structured such that a spherical head portion formed in one end of a ball stud is retained within a socket, a shaft in the other end of the ball stud is fastened to a knuckle, a large-diameter opening portion is fixed and retained to an outer peripheral surface of the socket, a small-diameter portion having a reinforcing ring embedded therein is retained to the shaft, the reinforcing ring is constructed by a tubular portion, and a flange portion extending from an end portion of the tubular portion toward the shaft, and is integrated with the small-diameter portion in such a manner that a side surface of the flange portion at a side of the knuckle and an inner peripheral surface of the flange portion facing a peripheral surface of the shaft are exposed.

Abstract: In a rubber-like elastic dust cover for a ball joint structured such that a spherical head portion formed in one end of a ball stud is retained within a socket, a shaft portion in the other end of the ball stud is fastened and fixed to a knuckle, a one end large-diameter opening portion having a buried metal reinforcement ring is fixed and retained to an outer peripheral surface of the socket, and the other end small-diameter opening portion is retained to the shaft portion, and having a film portion which connects the one end large-diameter opening portion and the other end small-diameter opening portion, protrudes to an outer side and is formed approximately into a hand drum shape, a concave portion is provided in an outer peripheral surface of a joint portion between the one end large-diameter opening portion and the film portion.

Abstract: In an elastic ball joint dust cover structured such that a spherical head portion formed in one end of a ball stud is retained within a socket, a shaft in the other end of the ball stud is fastened to a knuckle, a one end large-diameter opening portion is fixed and retained to an outer peripheral surface of the socket, the other end small-diameter portion embedding a reinforcing ring therein is retained to the shaft, the reinforcing ring is constructed by a tubular portion, and a flange portion extending from an end portion in a side of the knuckle in the tubular portion toward the shaft, and is integrated with the small-diameter portion in such a manner that a side surface of the flange portion in a side of the knuckle and an inner peripheral surface of the flange portion facing to a peripheral surface of the shaft are exposed.

Abstract: This invention provides a method for forming multilayer coating film excelling in smoothness and distinctness of image, by 3-coat-1-bake system in which a step of applying onto a coating object a water-based intermediate paint (X) to form an intermediate coating film; a step of adjusting the solid content of the intermediate coating film to 70-100 mass %; a step of applying onto the intermediate coating film a water-based base coating paint (Y) containing 30-55 mass parts of alcoholic solvent having a boiling point of 170-250° C., to form a base coating film; a step of adjusting the solid content of the base coating film to 70-100 mass %; a step of applying a clear paint (Z) comprising 40-60 mass parts of carboxyl-containing compound and 60-40 mass parts of polyepoxide onto the base coating film to form a clear coating film; and heating the intermediate coating film, base coating film and clear coating film at 100-120° C. for 3-10 minutes and thereafter further heating them at 130-160° C.

Abstract: This invention provides a method for forming multilayer coating film excelling in smoothness and distinctness of image, by 3-coat-1-bake system in which a step of applying onto a coating object a water-based intermediate paint (X) to form an intermediate coating film; a step of adjusting the solid content of the intermediate coating film to 70-100 mass %; a step of applying onto the intermediate coating film a water-based base coating paint (Y) containing 30-55 mass parts of alcoholic solvent having a boiling point of 170-250° C., to form a base coating film; a step of adjusting the solid content of the base coating film to 70-100 mass %; a step of applying a clear paint (Z) comprising 40-60 mass parts of carboxyl-containing compound and 60-40 mass parts of polyepoxide onto the base coating film to form a clear coating film; and heating the intermediate coating film, base coating film and clear coating film at 100-120° C. for 3-10 minutes and thereafter further heating them at 130-160° C.