Komatsu Corporation

Nippon Steel Corporation

Eiji Amada

Kazuo Maeda

Takanori Nagata

Daijirou Itou

Tsuyoshi Yoshida

Yutaka Neishi

Kei Miyanishi

Takashi Noda

Yusuke Kondo

Naomi Kobayashi

Norimasa Tsunekage

Kenichi Tanaka

Takeji Kajiura

Akihiro Ochiai

Mamoru Hatano

Ryoji Nishijima

Yuko Nagaki

Takafumi Amata

A track link which is a tracked undercarriage component is made of a steel having a specific component composition, and includes a high hardness portion having a hardness of HRC 57 or more and HRC 60 or less, and a low hardness portion. The high hardness portion includes a first matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the first matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a MCcarbide. The low hardness portion includes a second matrix including a martensite phase, and second nonmetallic particles dispersed in the second matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a MCcarbide.

Tracked undercarriage component, and method for producing the same

A steel constituting a chisel according to the present invention includes: 0.40-0.45% by mass of carbon, 0.50-0.80% by mass of silicon, 1.00-1.30% by mass of manganese, 0.001-0.005% by mass of sulfur, 2.90-3.80% by mass of chromium, and 0.20-0.40% by mass of molybdenum, with a balance consisting of iron and an unavoidable impurity, the steel has an ideal critical diameter DI defined by Equation (1) of 600 or more:DI=7&#xb7;(% C)&#xb7;(1+0.64&#xb7;% Si)&#xb7;(1+4.1&#xb7;% Mn)&#xb7;(1+2.83&#xb7;% P)&#xb7;(1&#x2212;0.62&#xb7;% S)&#xb7;(1+2.33&#xb7;% Cr)&#xb7;(1+3.14&#xb7;% Mo)&#x2003;&#x2003;(1).

Chisel and steel for chisel

A bearing bushing for a track has an annular shape including an inner peripheral surface, an outer peripheral surface, a first end face, and a second end face located axially opposite the first end face. The bearing bushing for a track includes an inner peripheral surface-side hardened layer formed to include the inner peripheral surface, an outer peripheral surface-side hardened layer formed to include the outer peripheral surface, a first end face-side hardened layer formed to include the first end face and having a region with a hardness of 63 HRC or more that has a thickness of 3 mm or more from the first end face, and an unhardened region lower in hardness than the inner peripheral surface-side hardened layer, the outer peripheral surface-side hardened layer, and the first end face-side hardened layer, and including at least the second end face. The bearing bushing is made of steel.

Bearing bushing for track, and method for producing the same

A steel for a tracked undercarriage component is used as a material constituting a track link (), for example, and contains: not less than 0.39% by mass and not more than 0.45% by mass of carbon, not less than 0.2% by mass and not more than 1.0% by mass of silicon, not less than 0.10% by mass and not more than 0.90% by mass of manganese, not less than 0.002% by mass and not more than 0.005% by mass of sulfur, not less than 0.1% by mass and not more than 3.0% by mass of nickel, not less than 0.70% by mass and not more than 1.50% by mass of chromium, and not less than 0.10% by mass and not more than 0.60% by mass of molybdenum, with the balance made of iron and unavoidable impurities.

Steel for tracked undercarriage component, and track link

An excavating tooth includes a body and an abrasion-resistant layer. The abrasion-resistant layer has hardness higher than the body. The body includes a tip end face, a first face, a second face, a pair of first slope faces, and a pair of second slope faces. The abrasion-resistant layer includes a first abrasion-resistant layer section and a second abrasion-resistant layer section. The first abrasion-resistant layer section is formed on the tip end face. The second abrasion-resistant layer section is formed respectively on the pair of first slope faces and the pair of second slope faces. Thereby, it is possible to obtain an excavating tooth and a body for the excavating tooth capable of keeping a penetration force of a blade edge high in penetrating into an excavation subject.

Excavating tooth and body for excavating tooth

A bucket tooth assembly is mounted to an adapter provided to a distal end part of a bucket of construction equipment. The bucket assembly includes a bucket tooth and a latching member. The bucket tooth has a cavity for inserting the adapter and a through-hole that is provided to the side face and communicates through to the adapter when the bucket tooth has been mounted to the adapter. The through-hole has a center axis. The latching member is fitted inside the through-hole and having a rotational axis disposed along a direction of the center axis and a bottom part provided to an end on an adapter side in an axial direction. The latching member is rotated to switch between a first state in which the bottom part is held inside the through-hole and a second state in which the bottom part protrudes toward a concave portion on the adapter side.

Construction-equipment bucket-tooth assembly and bucket provided to same

A bucket tooth for a construction vehicle includes a through-hole formed in a side wall part and passing through to a cavity. The through-hole has on a cavity side a rotating body hole having a shape of a truncated and rotated cone that remains after removing a large diameter side portion obtained by cutting diagonally to a rotational axis of the truncated and rotated cone with a large diameter side of the truncated and rotated cone being disposed on the cavity side, and with the rotational axis of the truncated and rotated cone being inclined outwardly toward the distal end portion of the bucket tooth from the cavity along a width direction of the bucket tooth.

Growing community of inventors

Kyotanabe, Japan

Eiji Amada