A rubber composition for anti-vibration rubber comprising, based on 100 parts by weight of ethylene-propylene-diene-based copolymer rubber (EPDM): (A) 32 to 60 parts by weight of carbon black A having an average particle diameter of 60 to 100 nm, an iodine absorption amount of 14 to 23 g/kg, and a DBP oil absorption amount of 100 ml/100 g or more; (B) 10 to 30 parts by weight of carbon black B having an average particle diameter of 40 to 50 nm, an iodine absorption amount of 35 to 49 g/kg, and a DBP oil absorption amount of 100 to 160 ml/100 g; (C) 2 to 10 parts by weight of ethylene-α-olefin copolymer; and (D) 0 to 16 parts by weight of silica. The rubber composition for anti-vibration rubber that has low dynamic magnification (small increase in elastic modulus associated with an increase in rubber deformation rate), excellent durability (bearing force against breakage due to repeated deformation of rubber), excellent heat resistance, etc., and that can be effectively used as a vulcanization molding material for a center bearing support, etc.

A rebound bumper for a shock absorber includes a first portion formed from a first material having a first spring rate and a second portion coupled to the first portion and formed from a second material having a second spring rate greater than the first spring rate. The first portion and the second portion are configured to fit on a piston rod between a piston and a rod guide assembly of the shock absorber. Also, the rebound bumper exhibits a displacement under load relationship with the first spring rate, the second spring rate, and a third spring rate greater than the first spring rate and less than the second spring rate.

An orifice plate includes a wear-resistant inner diameter surface, an outer diameter surface, a first side surface extending between the wear-resistant inner diameter surface and the outer diameter surface, and a second side surface extending between the wear-resistant inner diameter surface and the outer diameter surface, the second side surface disposed opposite the orifice plate from the first side surface. The orifice plate may comprise a body portion comprising a first material. The wear-resistant inner diameter surface may comprise a second, wear-resistant material.

A spacer (1) for vibration-damped fastening of a mounting part (2) to a carrier part (3), wherein the spacer has a base body (4) with a first flange region (5) and a second flange region (6) which is opposite viewed in the longitudinal direction (L) of the base body and with a passage (7) in which a fastener (8) which is connected to the carrier part, can be received at least sectionally. The base body has an at least two-part design with a first body part (9) and at least a further, second body part (10), wherein the body parts can be detachable connected to one another to create the base body and wherein, in the connected state, a gap region (11) is provided between the first and second flange region, by which the border of a fastening hole (18) configured in the mounting part can be received.

A method of attenuating annular pressure buildup within a wellbore. The method includes accessing a wellbore, with the wellbore having an annulus disposed between first and second strings of casing. The method also includes placing a column of cement around the second string of casing generally below the first string of casing. The method further includes pumping a fluid mixture into the annulus, forming a fluid column. The fluid mixture comprises a carrier fluid, and a plurality of compressible particles dispersed in the carrier fluid. Each of the compressible particles is fabricated to partially collapse in response to thermal expansion of the fluid mixture. The method also includes placing a wellhead over the wellbore, thereby forming a trapped annulus in the wellbore. The method additionally includes at least partially sealing the annular region along at least one depth above the column of cement to inhibit vertical migration of the compressible particles.

A wave spring comprises fiber in a thermoplastic resin matrix, and includes one or more annular wave-springs elements, or one or more curvilinear wave-spring elements. The annular wave-spring elements, which are arrayed in a stack, are not coupled to one another. A wave spring comprising annular wave-spring elements includes an alignment feature for establishing and maintaining the alignment of the wave spring elements. In a wave spring including curvilinear wave-spring elements, a first end of each curvilinear wave-spring element is attached to a first member and a second end of each curvilinear wave-spring element is attached to a second member, the plurality of curvilinear wave-spring elements being disposed between the two members. The plurality of curvilinear wave-spring elements in the array are positioned side by side, the array extending laterally along a length of the first member and second member, and providing a low-profile wave spring.

A rebound bumper for a shock absorber includes a first portion formed from a first material having a first spring rate and a second portion coupled to the first portion and formed from a second material having a second spring rate greater than the first spring rate. The first portion and the second portion are configured to fit on a piston rod between a piston and a rod guide assembly of the shock absorber. Also, the rebound bumper exhibits a displacement under load relationship with the first spring rate, the second spring rate, and a third spring rate greater than the first spring rate and less than the second spring rate.

A method of attenuating annular pressure buildup within a wellbore. The method includes accessing a wellbore, with the wellbore having an annulus disposed between first and second strings of casing. The method also includes placing a column of cement around the second string of casing generally below the first string of casing. The method further includes pumping a fluid mixture into the annulus, forming a fluid column. The fluid mixture comprises a carrier fluid, and a plurality of compressible particles dispersed in the carrier fluid. Each of the compressible particles is fabricated to partially collapse in response to thermal expansion of the fluid mixture. The method also includes placing a wellhead over the wellbore, thereby forming a trapped annulus in the wellbore. The method additionally includes at least partially sealing the annular region along at least one depth above the column of cement to inhibit vertical migration of the compressible particles.

A rubber composition for anti-vibration rubber comprising, based on 100 parts by weight of ethylene-propylene-diene-based copolymer rubber(EPDM): (A) 32 to 60 parts by weight of carbon black A having an average particle diameter of 60 to 100 nm, an iodine absorption amount of 14 to 23 g/kg, and a DBP oil absorption amount of 100 ml/100 g or more; (B) 10 to 30 parts by weight of carbon black B having an average particle diameter of 40 to 50 nm, an iodine absorption amount of 35 to 49 g/kg, and a DBP oil absorption amount of 100 to 160 ml/100 g; (C) 2 to 10 parts by weight of ethylene-α-olefin copolymer; and (D) 0 to 16 parts by weight of silica. The rubber composition for anti-vibration rubber that has low dynamic magnification (small increase in elastic modulus associated with an increase in rubber deformation rate), excellent durability (bearing force against breakage due to repeated deformation of rubber), excellent heat resistance, etc., and that can be effectively used as a vulcanization molding material for a center bearing support, etc.

A spacer (1) for vibration-damped fastening of a mounting part (2) to a carrier part (3), wherein the spacer has a base body (4) with a first flange region (5) and a second flange region (6) which is opposite viewed in the longitudinal direction (L) of the base body and with a passage (7) in which a fastener (8) which is connected to the carrier part, can be received at least sectionally. The base body has an at least two-part design with a first body part (9) and at least a further, second body part (10), wherein the body parts can be detachable connected to one another to create the base body and wherein, in the connected state, a gap region (11) is provided between the first and second flange region, by which the border of a fastening hole (18) configured in the mounting part can be received.