Abstract: A dust cover for a steering shaft includes a bush of low-frictional material, through which a steering shaft penetrates; a plurality of bellows made of rubber, provided in an axial direction of the steering shaft, and arranged between the bush and a panel for sealing the clearance; and an annular seal lip in contact with the outer periphery of the steering shaft.

Abstract: A flexible boot for a constant velocity universal joint (CVJ) includes a smaller-diameter mounting portion provided at one end, a larger-diameter mounting portion provided at the other end, and a bellows portion provided between both of the mounting portions. The larger-diameter mounting portion and the bellows portion are connected to each other by a straight portion, and the smaller-diameter mounting portion and the bellows portion are connected to each other by a straight portion. An axial distance of each of the straight portions is equal to or larger than 20% of an entire axial distance from a boundary between the larger-diameter mounting portion and the adjacent straight portion to a boundary between the smaller-diameter mounting portion and the adjacent straight portion, and an axial distance of the bellows portion is in a range of 20% to 60% of the entire axial distance, so that the bellows portion is located substantially centrally in an axial direction between both of the straight portions.

Abstract: A seal member adapted to be mounted between a cylinder head cover and an ignition plug tube comprises a mount portion interposed radially movably between an upper surface of an annular stepped portion formed around an opening of the cylinder head cover for insertion of the ignition plug tube and a baffle plate. A first seal portion and a second seal portion project radially outward and inward, respectively, from the mount portion to be brought into contact with a peripheral surface of the annular stepped portion and the ignition plug tube, respectively. The second seal portion can be elastically deformed following relative radial movements between the mount portion and the ignition plug tube.

Abstract: The invention relates to a CVJ boot in which contact pressure of crest portions closer to a large-diameter mounting portion on the compressed side of a bellows portion is reduced when slant faces forming a root portion of a bending point obtained by the S-shaped bend come into contact with each other, thereby increasing durability.

Abstract: A fuel tank includes a vent cutout valve having a first chamber connected to a vent tube, a second chamber communicating with a canister and a third chamber connected to an evaporation tube. The first and second chambers are defined by a first partition wall with a first communication bore and the second and third chambers are defined by a second partition wall with a second communication bore. A main body of the vent cutout valve is disposed within the second chamber to open the first communication bore when a shutter presses the main body of the vent cutout valve, and is provided with a check valve to close the second communication bore which is biased toward the second partition wall by a resilient member interposed between the check valve and the valve main body of the vent cutout valve.

Abstract: A method of injection blow molding a synthetic resin bellows product having root portions and crest portions, each of which has the axially sectional form of a circular arc, and incline portions therebetween, for example, a plastic bellows product such as a constant-velocity joint boot, a steering boot or the like. The method is capable of molding a product having a thickness uniform throughout, and particularly, root portions having little dimensional variations. The method involves firstly molding the parison root portions or the root portions plus their adjacent areas into substantially the same shape as those of a final product by injection molding during molding of a parison, and then blow molding only the crest portions and the incline portions to obtain the shape of the final product.

Abstract: A seal device is adapted to be mounted at an area of relative rotation between two mounting portions of a tire pressure-adjusting device. The seal device includes a pair of first and second seal rings which are disposed in opposed relation to each other. Each of the first and second seal rings includes a main seal of an annular shape having a radially inwardly-directed lip formed on an inner periphery of the main seal, the lip having at its distal end a lip sliding surface to which a self-lubricating thin plate for sliding contact with one of the two mounting portion. Each seal ring further includes an auxiliary seal of an annular shape having a radially inwardly-directed lip which is formed on an inner periphery of the auxiliary seal and is adapted for sliding contact with the one mounting portion, the auxiliary seal being connected to the main seal to form therebetween a closed space for holding grease.

Abstract: A dust seal for a sliding type bush is interposed between a stationary section and a movable section. The dust seal has a fitting portion fitted to the stationary section, a seal lip portion in sliding contact with the outer circumferential surface of the movable section and a flexible portion interconnecting the fitting portion and the seal lip portion. The dust seal is further provided with an annular projection held in contact with a flange and the outer circumferential surface of the movable section. The seal lip portion is held axially stationarily relative to the movable section.

Abstract: A flexible boot for universal joints including a joint body having an inner ring fixed to one end of a first shaft and an outer ring provided on one end of a second shaft comprises both ends fixed to the outer ring and to the first shaft, respectively, and a bellows portion positioned between the both ends and having at least one valley. There is provided at least one elastic holder ring closely contacted with an outer peripheral surface of the at least one valley to prevent acute folding of the valley of the flexible boot.

Abstract: A flexible boot having a bellows and mount portions on both axial ends of the bellows portion at which the boot is mounted on parts of a mechanism such as an automotive constant velocity joint. The flexible boot has an anti-degradation agent make-up element made of a material which contains an anti-degradation agent and which is capable of allowing the anti-degradation agent to precipitate on the surface thereof. The anti-degradation agent make-up element is fitted on at least a portion of the outer surface of the bellows so that the anti-degradation agent precipitated on the surface of the material of the anti-degradation agent make-up element is caused to progressively immigrate into the material of the bellows thereby making-up the anti-degradation agent in the bellows.

Abstract: A universal joint provided with a joint body having an inner ring disposed at one end of a first shaft and an outer ring disposed at one end of a second shaft, and a flexible boot fitted at its opposite ends to said outer ring and the first shaft. Inside the flexible boot is formed a sealed space in which grease for lubricating the joint body is enclosed and which is charged with nitrogen gas.

Abstract: An oil seal assembly 1 for forming a seal between a wall of a machine housing 3 and a rotatable shaft 10 extending through said wall to prevent a fluid from leaking from inside to the outside of said housing through the gap between said wall and said shaft. The oil seal assembly comprises an elastic seal ring 7 made of an elastic material and having a base portion for fitting to the wall, a lip portion 5 with a lip edge 8 for resilient sliding contact with the surface of the shaft, and a lip neck portion 6 through which the lip portion is connected to the base portion. The oil seal assembly further comprises a reinforcement ring 4 made of a comparatively stiff material and associated with said base portion of said elastic seal ring.

Abstract: A sealing device has a single rubber seal member provided with two oppositely directed seal lips which form a V-shaped cross-section and which are in contact with a spherical surface. Grease is filled in the V-shaped space. A portion of an outer fitting member protrudes inwardly to hold the seal member in place.