Abstract: A fumaric acid diester based resin containing a dipropyl fumarate residue unit and a fumaric acid diester residue unit having a C1 or C2 alkyl group, wherein in a retardation film composed of the resin, when a refractive index in the fast axis direction within the film plane is designated as nx, a refractive index in the film in-plane direction orthogonal thereto is designated as ny, and a refractive index in the thickness direction of the film is designated as nz, the respective refractive indices are satisfied with a relationship of (nx?ny<nz) and a relationship between a film thickness and an out-of-plane retardation measured at a wavelength of 550 nm and expressed by the specific equation is 4.5 nm/film thickness (?m) or more in terms of an absolute value.

Abstract: When an engaging pawl 23b is fitted into a recessed portion 34b of a first sprocket 34, which is linked by a chain 33 to a second sprocket 32 that drives an oil pump 3 disposed at a radial detached from a torque converter 2, frictional resistance between a side face 34a of the first sprocket 34 and an end face 23c of the engaging pawl 23b is reduced by tapering the side face 34a of the first sprocket 34.

Abstract: A fumaric acid diester based resin containing a dipropyl fumarate residue unit and a fumaric acid diester residue unit having a C1 or C2 alkyl group, wherein in a retardation film composed of the resin, when a refractive index in the fast axis direction within the film plane is designated as nx, a refractive index in the film in-plane direction orthogonal thereto is designated as ny, and a refractive index in the thickness direction of the film is designated as nz, the respective refractive indices are satisfied with a relationship of (nx?ny<nz) and a relationship between a film thickness and an out-of-plane retardation measured at a wavelength of 550 nm and expressed by the specific equation is 4.5 nm/film thickness (?m) or more in terms of an absolute value.

Abstract: A novel fumaric diester copolymer suitable for used in an optical material having excellent heat resistance and transparency is provided. The fumaric diester copolymer comprises a specific fumaric diester residue, and at least one (meth)acrylic ester residue unit selected from a specific (meth)acrylic ester residue unit having an oxetanyl group and a specific (meth)acrylic ester residue unit having a tetrahydrofurfuryl group, and has a number average molecular weight of from 1,000 to 500,000.

Abstract: When an engaging pawl 23b is fitted into a recessed portion 34b of a first sprocket 34, which is linked by a chain 33 to a second sprocket 32 that drives an oil pump 3 disposed at a radial detached from a torque converter 2, frictional resistance between a side face 34a of the first sprocket 34 and an end face 23c of the engaging pawl 23b is reduced by tapering the side face 34a of the first sprocket 34.

Abstract: A novel fumaric diester copolymer suitable for used in an optical material having excellent heat resistance and transparency is provided. The fumaric diester copolymer comprises a specific fumaric diester residue, and at least one (meth)acrylic ester residue unit selected from a specific (meth)acrylic ester residue unit having an oxetanyl group and a specific (meth)acrylic ester residue unit having a tetrahydrofurfuryl group, and has a number average molecular weight of from 1,000 to 500,000.

Abstract: After a driven sprocket into which a ball bearing is press-fitted is pushed into a cylindrical portion of a pump cover, a sensor jig is set so as to have its legs extending from a base plate in contact with an end face of the cylindrical portion, and a front end of a sensor plate movable in parallel with the leg 13 in contact with an end face of the ball bearing. When the driven sprocket is not in a normal position in relation to the oil pump, the sensor plate intersects a light path between a light-emitting device and a light-receiving device placed as opposed to each other on the base plate, and on the other hand, when the driven sprocket is in a normal position, a light-passing hole formed in the sensor plate comes on the light path between the light-emitting device and the light-receiving device. Thereby it can be automatically determined based upon absence or presence of an optical signal from the light-receiving device whether or not an attachment state is appropriate.

Abstract: After a driven sprocket into which a ball bearing is press-fitted is pushed into a cylindrical portion of a pump cover, a sensor jig is set so as to have its legs extending from a base plate in contact with an end face of the cylindrical portion, and a front end of a sensor plate movable in parallel with the leg 13 in contact with an end face of the ball bearing. When the driven sprocket is not in a normal position in relation to the oil pump, the sensor plate intersects a light path between a light-emitting device and a light-receiving device placed as opposed to each other on the base plate, and on the other hand, when the driven sprocket is in a normal position, a light-passing hole formed in the sensor plate comes on the light path between the light-emitting device and the light-receiving device. Thereby it can be automatically determined based upon absence or presence of an optical signal from the light-receiving device whether or not an attachment state is appropriate.

Abstract: There is provided an oil pump driving structure of an automatic transmission which can prevent slack of a chain, which is looped over a drive sprocket on a main shaft and a driven sprocket of an oil pump, and resulting poor engagement of the chain and the driven sprocket by a simple construction. A chain guide is projected integrally from an end face of a housing cover attached to an opening of a switching unit housing in a transmission case and is located in the vicinity of the driven sprocket. The chain guide guides a slacked side of the chain through a path closer to a tensioned side of the chain. As a result, even if the accuracy of the center distance between a drive sprocket and the driven sprocket is not improved, vibration of the chain can be suppressed to improve quietness.