Abstract: A sealing device for sealing space between two members concentrically and relatively rotating comprising a core member fixedly fitted into one of the two members, a metal slinger fixedly fitted into the other of the two members, and an elastic seal member fixedly attached to the core member and having a seal lip which elastically and slidably contacts the slinger. The slinger has a slidably contacting treated surface for the seal lip as is processed such a surface-treatment as defined by the following parameters: arithmetic mean roughness Ra in the range from 0.5 ?m to 1.5 ?m, root-mean-square roughness Rq in the range from 0.6 ?m to 2.0 ?m, mean surface irregularity interval Sm in the range from 0.05 mm to 0.17 mm and peak count Pc (50%) in the range from 20 to 60.

Abstract: A seal member which is used in a seal part comprising a molded rubber article produced by vulcanizing a rubber composition comprising, a hydrogenated nitrile rubber (A), carbon black (B), and carbon black (C) and/or carbon fiber (D), wherein carbon black (B) has a DBP oil absorption of 250 to 450 mL/100 g, carbon black (C) has a DBP oil absorption of 200 mL/100 g or less, and carbon fiber (D) has an average fiber length of 0.05 to 2 mm and an average fiber diameter of 5 to 30 ?m; and wherein, based on 100 parts by mass of the hydrogenated nitrile rubber (A), the amount of carbon black (B) is 5 to 15 parts by mass, the total amount of carbon black (C) and/or carbon fiber (D) is 3 to 35 parts by mass, and the total content of the fillers is 40 parts by mass or less.

Abstract: A fuel injection valve is mounted in a cylinder head by being inserted in an insertion hole provided in the cylinder head. A shoulder section is provided at the inlet portion of the insertion hole to be expanded in an annular shape. The fuel injection valve is provided with a stepped section expanded in diameter in a tapered manner to have a tapered surface facing the shoulder section. A vibration insulator is disposed between the stepped section and the shoulder section. The vibration insulator is provided with a circular annular tolerance ring making contact with the tapered surface of the fuel injection valve. A circular annular sleeve section coaxial with the tolerance ring is integrally formed on the tolerance ring to extend from the surface of a portion of the tolerance ring, the portion not facing the tapered surface of the fuel injection valve.

Abstract: The position of a passage separating member in the axial direction of the cylinder bores is determined by causing a spacer to contact a bottom surface of a water jacket. When the separating member is inserted in the water jacket, the width of the separating member is reduced due to elastic deformation, so that the separating member can be arranged in the water jacket. After being arranged, the separating member tightly contacts the inner surface of the water jacket due to elastic restoration force. The tight contact prevents the separating member from moving upward in the water jacket. As a result, coolant is prevented from moving between the upper portion and the lower portion with respect to the separating member. The advantages of separate cooling of the coolant in the upper and lower portions with respect to the separating member are obtained. This reliably reduces the temperature difference along the axial direction of the cylinder bore forming body.

Abstract: A rubber gasket of annular shape adapted to be interposed between two objective members to be sealed and fastened to each other and a seal structure for sealing between two objective members to be sealed and fastened to each other using the gasket. The rubber gasket comprises an integrally molded body made of elastomer having a cylindrical body, a flange-shaped portion, and an annular core member, the flange-shaped potion extending outward from one end of the cylindrical body in axial direction along an entire outer circumferential surface, the annular core member being embedded in the flange-shaped portion along an entire circumference.

Abstract: A production method of an annular gasket comprising a metal base and an elastic seal layer laminated to each side thereof, comprising the steps of subjecting a metal sheet to punching out process to obtain a plurality of divided constituent members for the metal base, each of the divided constituent member having a slightly wider width than a given gasket width and a predetermined shape for constituting an annular shape of the given gasket, butting these constituent members to temporarily configure the annular shape and bonding the butt parts to each other by welding to form an annular object, subsequently laminating an elastic compound material to each side of the annular object to form elastic seal layers after applying pressurizing process to the annular object, and punching a given shape out of the annular object to obtain the annular gasket.

Abstract: A vibration insulator which can compensate for axial eccentricity occurring in a fuel injection valve and suppress vibrations of the valve during operation of a combustion engine and a support structure for the valve. The vibration insulator is interposed between a step height portion of the valve and a shoulder portion. The step height portion is increased in diameter in a tapered fashion and inserted into an insertion hole of a cylinder head. The shoulder portion is annularly extended in an inlet portion of the insertion hole opposed to the step height portion. The vibration insulator includes an annular tolerance ring on an inner circumferential inclined face thereof with recessed tapered faces opposed to the tapered face of the step height portion and which abuts the tapered face. The taper angles of the tolerance ring and of the step height portion are set so as to be different.

Abstract: A gasket and a gasket seal structure in which the gasket is adapted to be inserted into a cutout recess part formed on a wall part of a box-shaped member with an opening part on at least one surface, the cutout recess part communicating with the opening part. The gasket and the structure thereof are characterized by the followings; the cutout recess part has a chamfered surface at the corner part on the opening part side; the gasket comprises an exterior rubber part having a seal surface part elastically contacting the cutout recess part and a core body having higher rigidity than that of the exterior rubber part and covered with the exterior rubber part; and the seal surface part has at a region corresponding to the corner part on the opening part side of the cutout recess part a projecting part formed along the corner part on the opening part side and projecting toward the corner part on the opening part side of the cutout recess part.

Abstract: A method for processing a rubber surface and a sealing member treated with the method. In the first mode, a rubber surface is formed with a large number of small dimples in a regularly dotted pattern by irradiating laser beams from a laser irradiation device. In the second mode, a skin layer of the rubber surface is removed by irradiating laser beams from the laser irradiation device. In the third mode, the first mode and the third mode are combined. A sealing member comprises rubber including a seal lip part for elastically and slidably contacting a counterpart member, wherein a sliding contact surface of the seal lip part contacting the counterpart member is treated with one of the first, the second and the third modes of the method for processing a rubber surface.

Abstract: The thermostat installing structure is provided, according to which a thermostat can be installed stably in the circulation path of cooling medium, and the circulation path of cooling medium can be also fastened to the body of an internal combustion engine without causing any damage to the function of the thermostat. The thermostat (5) comprises a frame (12) formed integrally with an annular supporting substrate (6) having the inner circumferential edge portion serving as a valve seat (6a) and regulating a projecting head portion (7a) of an extendable rod (7), whereby the thermostat is installed between the circulation path of cooling medium and the cooling medium channel of the internal combustion engine in a manner that the circulation path of cooling medium and the internal combustion engine body are integrally fastened by fixing the thermostat at a predetermined position in the circulation path of cooling medium with the fixing means and thereafter fitting a gasket.

Abstract: A coreless seal arranged between a rotation shaft and an outer member has an inner diameter surface opposed to an outer diameter surface of the rotation shaft with a space for preventing leakage of fluid. The outer member has a flange bent inwardly. The coreless seal has an outer diameter and an inner diameter that are dimensions obtained by adding interference for an amount of thermal shrinkage as a whole dimension.

Abstract: A sealing device which comprises a slinger fixedly fitted to the rotary side member, a core member fixedly fitted to the stationary side member, and an elastic sealing member fixed to the core member and having a seal lip which elastically and slidably contacts the slinger. The slinger comprises a fitting cylindrical portion to be fitted into the rotary side member, a brim portion extending its radial direction at one end of its outside relative to a sealed portion of the fitting cylindrical portion, and a rotary side fixing member fixed to the brim portion. Further, the slinger is made in such a manner that an adhesive layer is formed on its whole surface including a contacting side surface where the seal lip contacts by applying adhesive agent thereon, then the fixing member is integrally fixed thereto, thereafter the adhesive layer is partially removed only in the contacting side surface.

Abstract: A water jacket spacer has a spacer body molded in conformity to the shape of the water jacket and a regulating member whose one side is fixed to the spacer body. The regulating member is composed of a first member which is not water-swellable and is elastically deformable and a second member made of water-swellable elastomer which is integrally fixed to the first member. The regulating member lies in a state not-contacting an opposed wall of the water jacket when inserted into the water jacket together with the spacer body, whereas it blocks a part of cooling water flowing through the water jacket by deforming such that a side of the regulating member not fixed to the spacer body faces toward the opposed wall of the water jacket when the second member swells by absorbing cooling water flown into the water jacket and thereby the first member is elastically deformed.

Abstract: A seal structure for sealing a penetrated portion through which a rotary shaft passes between a cover member and the rotary shaft. A seal member is fitted onto the rotary shaft in a manner that the rotary shaft can rotate relative to the seal member, and the elastic buffer member is provided for connection between the seal member and the cover member at the penetrated portion. The seal structure can keep sealing performance by reducing the influence of movements such as vibration and thermal expansion of the cover member and the influence of process tolerance of the cover member on the sealing performance of the seal member attached to the penetrated portion between the cover member and the rotary shaft penetrating the cover member.

Abstract: An annular sealing device having a core member and a seal lip member of elastic body fixed to the core member, adapted to be mounted between a metal outer member and an inner member with a flange portion in which the outer member and the inner member are concentrically provided and relatively rotate. The core member comprises a fitting cylindrical portion which is fitted to an inner circumferential portion of the outer member, an outward flange portion extending in centrifugal direction from one end of the fitting cylindrical portion, and including an abutment portion which directly contacts an end surface on the side of the flange portion of the outer member under fitted state, and an inward flange portion extending in centripetal direction from the other end of the fitting cylindrical portion.

Abstract: An annular magnetic encoder capable of detecting an absolute position precisely by specifying the shape of a magnetization pattern. The annular magnetic encoder (A) is of such a type that the magnetic poles (2a) of N pole and S pole are formed alternately at an equal pitch by magnetization along the circumferential direction of an annular magnetic body (2), an unequal pitch region (20) is provided at least one place in the circumferential direction of the annular magnetic body (2) corresponding to a plurality of magnetic poles (2a). The unequal pitch region (20) consists of one specific pole portion (2b) in the center and different pole portions (2c) located on the periphery thereof whose polarity is different from that of the specific pole portion.

Abstract: A cylindrical cover-attached encoder apparatus, including a magnetic metal-based body having a cylindrical shape, a magnetic rubber-based encoder having a cylindrical shape and formed around the outer peripheral surface of said magnetic metal-based cylindrical body, and a nonmagnetic material-based cover having a cylindrical shape and adapted to be mounted on said magnetic rubber-based encoder for covering the outer peripheral surface of the cylindrical portion of said magnetic rubber-based encoder.

Abstract: A sealing device formed to seal between a fixed side member and a rotating side member, comprising a slinger having a fitting cylindrical part fitted to the rotating side member and a flange part formed at one end part of the fitting cylindrical part positioned on the outer side of a sealed portion so as to be extended in the radial direction. A core comprises at least a fitting cylindrical part fitted to the fixed side member. The sealing device is characterized in that one end part of the fitting cylindrical part positioned on the outer side of the sealed portion is projected outward more than the sealed portion side inner surface position of the flange part of the slinger and a part of a seal lip part is formed to be brought into elastically slidable contact with the extended end face of the slinger.

Abstract: A sealing device formed to seal between a fixed side member and a rotating side member, comprising a slinger having a fitting cylindrical part fitted to the rotating side member and a flange part formed at one end part of the fitting cylindrical part positioned on the outer side of a sealed portion so as to be extended in the radial direction. A core comprises at least a fitting cylindrical part fitted to the fixed side member. The sealing device is characterized in that one end part of the fitting cylindrical part positioned on the outer side of the sealed portion is positioned on the sealed portion side more than the sealed portion side inner surface position of the flange part of the slinger and a part of a seal lip part is formed to be projected from near one end part of the fitting cylindrical part of the core and to be brought into elastically slidable contact with the extended end face of the slinger.

Abstract: A sealing cap made of metal adapted to be fitted into an end opening of a cylindrical mechanical member for closing an inner cylindrical portion of the mechanical member. The sealing cap comprises a disk-like cap body and a cylindrical portion integrally extended from a circumferential edge portion of the cap body and fitted under pressure into the end opening of the inner cylindrical portion of the cylindrical mechanical member. The cap body includes an inclined surface portion whose diameter is gradually reduced toward inner side of the inner cylindrical portion of the cylindrical mechanical member.