Komatsu Corporation

Ryuusuke Komura

Hiroshi Yamamoto

Jun Maruyama

Teiichirou Chiba

Tatsuo Aira

Akinobu Iwasaki

Yasunori Sato

A bearing seal includes an outer seal easily displaceable in the radial direction, an inner ring as a ring-shaped rigid portion not extendable in the radial direction, an inner seal having a seal lip, and an outer ring arranged on the outer peripheral portion of the outer seal, in which the spring constant of the inner seal is set to be larger than the spring constant of the outer seal. The sealing performance between the inner seal and the pin is ensured by using the ring-shaped rigid portion as a boundary. When the pin is displaced in the radial direction, the ring-shaped rigid portion is integrally displaced with the pin via the inner seal, and the displacement of the ring-shaped rigid portion can be absorbed by the outer seal.

Bearing seal and swing device

A spherical slide bearing has an outer ring and an inner ring slidably retained within the outer ring. A pin having a grease supply flow path extending through an interior thereof to open in an outer peripheral surface thereof is inserted into the inner ring so that the pin is circumferentially slidable, with the inner ring being equipped with a communication flow path establishing communication between a gap defined between the inner ring and the pin and a gap defined between the inner ring and the outer ring. The inlet port of the communication flow path is provided at a position where grease having flown out of an outlet port of the grease supply flow path flows after having flown through the gap between the pin and the inner ring substantially through the entire length in the axial direction of the pin.

Spherical slide bearing system

A dot mark forming method for obtaining a dot mark includes a liquid crystal mask in which the maximum length of each pixel is 50 to 2,000 &mgr;m and is irradiated with a homogenized laser beam. The energy density of a split laser beam passed through the liquid crystal mask is set to 1.0 to 15.0 J/cm and is condensed after the mask by a lens unit so that the maximum length of each dot becomes 1 to 15 &mgr;m. A single dot mask is formed on each laser irradiated point. The dot mark has a protrusion in the center which protrudes upward from the surface of the article to be marked. The length along the surface of the article is 1 to 15 &mgr;m and the height of the protrusion is 0.01 to 5 &mgr;m.

Growing community of inventors

Hiratsuka, Japan

Ryuusuke Komura