摘要:
In the production of polyphenylene ethers by oxidative polycondensation of phenols in the presence of a complex catalyst, an aminocarboxylic acid derivative and a reducing agent are simultaneously added to the reaction mixture when the resulting polyphenylene ether has attained the desired degree of polymerization, thereby to terminate the polymerization and simultaneously purify the reaction mixture. Hence, a stable purified polymer can be obtained.
摘要:
A method for recovering polyphenylene oxide having a high bulk density and a reduced content of fine particles from a solution of a polyphenylene oxide, which comprises adding a non-solvent composed of a lower alkyl alcohol and water to an aromatic solvent solution of a polyphenylene oxide substantially free from impurities to precipitate the polyphenylene oxide, the weight ratio of the aromatic solvent to the lower alkyl alcohol being from 1:1 to 1:2 and the weight ratio of the lower alkyl alcohol to water being from 1:0.005 to 1:0.1 in the precipitation system, and the addition of the non-solvent being controlled such that a liquid composition of the aromatic solvent, the lower alkyl alcohol and water forms a single phase; and recovering the precipitated polyphenylene oxide.
摘要:
A process for continuously producing an oxymethylene polymer by continuously polymerizing a starting monomer containing at least 50 mole% of trioxane in bulk in the presence of a catalyst, which comprises feeding the starting monomer into a first-stage polymerization reactor having a self-cleaning action to perform a first-stage polymerization reaction until the conversion reaches 40 to 70%, withdrawing the reaction mixture as a powder from the outlet of the first-stage polymerization reactor, feeding the reaction mixture into a second-stage polymerization reactor having a stirring action to perform a second-stage polymerization reaction until the conversion reaches 95 to 100%, and then withdrawing the polymerization product as a powder from the outlet of the second-stage polymerization reactor.
摘要:
There is provided a chain tension applying device for a bicycle that can accommodate a change in an axial distance between a frame and a sprocket. A chain tensioner 40 is a device for applying tension to a chain 26, including: a bracket 56; a tension member 58; a securing position adjustment mechanism 60; and an urging member 62. The bracket is mountable to a frame (a mounting lug 24b) of the bicycle. The tension member is secured to the bracket immovably in a first direction and movably in a second direction different from the first direction, and can apply tension to the chain. The securing position adjustment mechanism can adjust a securing position of the tension member to the bracket in the first direction by sliding. The urging member urges the tension member in the second direction.
摘要:
A basic required manipulated variable Mfbdmd_a is determined on the basis of a state amount error, which is the difference between a state amount of a motion of an actual vehicle 1 and a reference state amount, then a driving/braking force manipulation control input Fxfbdmd_n of a wheel is determined on the basis of the above basic required manipulated variable. At this time, a change in a driving/braking force operation control input Fxdmd_n of a front wheel and a rear wheel, respectively, of a particular set is made to be proportional to a change in the basic required manipulated variable Mfbdmd_a, and the ratio (gain) of a change in Fxdmd_n with respect to a change in Mfbdmd_a is made to change on the basis of gain adjustment parameters, such as side slip angles βf_act and βr_act. This makes it possible to properly control a motion of the actual vehicle to a desired motion by properly manipulating a road surface reaction force acting on a front wheel of the vehicle and a road surface reaction force acting on a rear wheel.
摘要:
A driving/braking force manipulation control input of a k-th wheel, which denotes one or more specific wheels among a plurality of wheels of a vehicle, is determined such that a required condition concerning a relationship among a road surface reaction force that may act from a road surface on the k-th wheel on the basis of the detected values or estimated values of a road surface reaction force and a friction characteristic of the k-th wheel, a feedback control input related to the driving/braking force of the k-th wheel for bringing a difference between a state amount of the vehicle and a reference state amount close to zero, a driving/braking force feedforward control input based on a drive manipulated variable supplied by a driver of the vehicle, and a k-th wheel driving/braking force manipulation control input is satisfied. This arrangement makes it possible to properly control a motion of an actual vehicle to a desired motion while properly considering the characteristics of a road surface reaction force acting from a road surface on a wheel.
摘要:
An internally geared hub ball pushing unit is configured to be mounted on a hub axle such that is less likely to experience a decrease in bearing durability resulting from deformation of the ball pushing surface. The ball pushing unit is provided with an inside member and an outside member. The inside member has a fitting part configured to be fitted onto the hub axle with a sleeve insertion recess disposed on its internal circumferential portion and an externally threaded or splined section disposed on its external circumferential portion. The outside member has a ball pushing surface on its external circumferential portion and an internally threaded or splined section configured to non-rotatably connect to the externally threaded section.
摘要:
An internally geared hub ball pushing unit is configured to be mounted on a hub axle such that is less likely to experience a decrease in bearing durability resulting from deformation of the ball pushing surface. The ball pushing unit is provided with an inside member and an outside member. The inside member has a fitting part configured to be fitted onto the hub axle with a sleeve insertion recess disposed on its internal circumferential portion and an externally threaded or splined section disposed on its external circumferential portion. The outside member has a ball pushing surface on its external circumferential portion and an internally threaded or splined section configured to non-rotatably connect to the externally threaded section.
摘要:
A bicycle hub fastening structure employs an easy-to-connect connecting structure to improve the ease and efficiency with which an internally geared bicycle hub is fastened to a bicycle frame. The fastening structure has a nut member, a rotation prevention member and a connecting part. The nut member has a first contact surface and a threaded bore. The rotation prevention member has a cylindrical main body with a second contact surface contacting the first contact surface, a first (frame) restricting part configured to restrict rotation relative to a bicycle frame, and a second (hub axle) restricting part configured to restrict rotation relative to the hub axle. The connecting part has a retaining member attached to the nut member and serves to connect the nut member and the rotation prevention member together in a freely rotatable manner.
摘要:
A hub cover is configured to be mounted to a wheel regardless of the spoke configuration of the wheel. The bicycle hub cover is capable of being attached to a bicycle hub that has a hub shell. The hub shell has a hub flange and a cap member. The hub cover comprises a cylindrical part, a retaining part, and a connecting part. The cylindrical part is capable of being attached to the cap member, which is mounted to the hub shell on the axially outward side of the hub flange. The retaining part is configured to latch onto the hub flange. The connecting part is configured to extend radially outward from the cylindrical part and connect the cylindrical part and the retaining part together.