Machine component and method for producing the same
AssigneeKomatsu Ltd.
InventorsMasayuki Ohishi, Masaharu Amano
Life of this patent
Estimating the term…
Abstract
A sprocket wheel, which is a machine component configured to slide relative to a bushing while being in contact with the bushing in an outer peripheral surface, includes a base made of a first metal, and an overlay that covers the base so as to constitute the outer peripheral surface. The surface of the overlay constituting the outer peripheral surface has been smoothed. Such a smoothed surface of the overlay makes the sprocket wheel less damaging to the bushing.
Claims12
A machine component having a contact region and moves relative to another component while being in contact with the other component in the contact region, the machine component comprising:
- a base made of a first metal;
- and
- an overlay covering the base so as to constitute at least a part of the contact region, the overlay having a smoothed surface, wherein the smoothed surface refers to a state at which a surface profile affected by surface tension in a liquid state has been eliminated from the surface of the overlay, the smoothed surface constituting the contact region, wherein after the overlay is formed via overlaying welding, the surface of the overlay constituting the contact region has been smoothed by forging;
- wherein
- the overlay includes:
- a matrix made of a second metal, and
- hard particles dispersed in the matrix;
- and
- the hard particles are WC- or W2C-based particles;
- and
- wherein the surface of the overlay constituting the contact region was smoothed without changing the shape of the hard particles.
A machine component having a contact region and moves relative to another component while being in contact with the other component in the contact region, the machine component comprising:
- a base made of a first metal;
- and
- an overlay covering the base so as to constitute at least a part of the contact region, the overlay having a smoothed surface, wherein the smoothed surface refers to a state at which a surface profile affected by surface tension in a liquid state has been eliminated from the surface of the overlay, the smoothed surface constituting the contact region, wherein after the overlay is formed via overlaying welding, the surface of the overlay constituting the contact region has been smoothed by forging;
- wherein
- the overlay includes:
- a matrix made of a second metal, and
- hard particles dispersed in the matrix;
- the overlay having the smoothed surface having at least one hard particle having a region exposed from the surface of the overlay having the smoothed surface;
- and
- the hard particles are WC- or W2C-based particles;
- and
- wherein the surface of the overlay constituting the contact region was smoothed without changing the shape of the hard particles.
A machine component having a contact region and moves relative to another component while being in contact with the other component in the contact region, the machine component comprising:
- a base made of a first metal;
- and
- an overlay covering the base so as to constitute at least a part of the contact region, the overlay, the overlay including:
- a matrix of a second metal, and
- hard particles dispersed in the matrix;
- wherein
- the overlay has a smoothed surface, wherein the smoothed surface refers to a state at which a surface profile affected by surface tension in a liquid state has been eliminated from the surface of the overlay, the smoothed surface constituting the contact region, wherein after the overlay is formed via overlaying welding such that at least one of the hard particles has a region exposed from the surface of the overlay, the surface of the overlay constituting the contact region has been smoothed by forging such that the at least one of the hard particles having the region exposed from the surface of the overlay is pressed deeper into the matrix of the overlay such that the region remaining exposed from the surface of the overlay has decreased;
- and
- the hard particles are WC- or W2C-based particles;
- and
- wherein the surface of the overlay constituting the contact region was smoothed without changing the shape of the hard particles.
Dependencies are inferred from the claim text.