Abstract: A multi-piece solid golf ball comprises a solid core and a cover of two inner and outer layers surrounding the core. The solid core has a distortion of at least 2.4 mm under an applied load of 100 kg. The inner cover layer is formed mainly of an ionomer resin to a Shore D hardness of 28-58, and the outer cover layer is formed mainly of a thermoplastic polyester elastomer to a Shore D hardness of 28-55.

Abstract: In a golf ball colored other than white, the color tone thereof as represented in accordance with the CIELAB color system has an L value of not less than 80, an a value of -30 to +30, and a b value of -30 to +30. The golf ball is preferably colored blue, green, pink, yellow, or orange. Usually, the cover layer of the golf ball is colored in order to color the golf ball. The golf ball does not cause a golfer to feel mental or visual incompatibility while addressing the ball, looks white as viewed from a distance, but looks other than white as viewed at close range to thereby distinguish itself from other balls. Also, the golf ball has improved fashionable features as compared with conventional color balls.

Abstract: A gear mechanism has a plurality of gears provided on a shaft and is housed in a housing. Oil is filled into a lower part of the housing. The bottom of the housing is raised to conform to the contour of the gears and an oil return passage in the form of a groove extending in the direction of the row of the gears is formed in the bottom surface of the housing.