Engine piston, engine, hand-held tool, and method of manufacturing an engine piston
AssigneeHusqvarna AB
InventorsHenrik Assarsson, Johan Lönn
Life of this patent
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Abstract
A two-stroke engine piston (1) is disclosed comprising a piston top (3), a mantle surface (5), a stratified scavenging channel (7) in the mantle surface (5), and a weight reduction space (9) arranged between the piston top (3) and the stratified scavenging channel (7). The weight reduction space (9) has a largest first axial extent (a1) at the mantle surface (5) and a second axial extent (a2) radially inside the mantle surface (5), and wherein the second axial extent (a2) is greater than the largest first axial extent (a1). The present disclosure further relates to an engine (30), a hand-held tool (40), and a method of manufacturing an engine piston (1).
Claims19
A two-stroke engine piston comprising:
- a piston top,
- a mantle surface,
- a stratified scavenging channel in the mantle surface, and
- a weight reduction space arranged between the piston top and the stratified scavenging channel,
- wherein the weight reduction space has:
- a first axial extent at the mantle surface;
- a second axial extent radially inside the mantle surface;
- a first tangential extent at the mantle surface;
- and
- a second tangential extent radially inside the mantle surface,
- wherein the second tangential extent is greater than the first tangential extent,
- wherein the second axial extent is greater than the first axial extent, and
- wherein the first tangential extent is greater than the first axial extent.
A two-stroke engine piston comprising:
- a piston top;
- a mantle surface;
- a stratified scavenging channel in the mantle surface;
- and
- a weight reduction space arranged between the piston top and the stratified scavenging channel,
- wherein the weight reduction space has a first axial extent at the mantle surface and a second axial extent radially inside the mantle surface,
- wherein the second axial extent is greater than the first axial extent,
- wherein the piston comprises a first piston ring recess in the mantle surface,
- wherein the weight reduction space extends radially inside the first piston ring recess,
- wherein the piston comprises a second piston ring recess in the mantle surface, and
- wherein the weight reduction space extends radially inside the second piston ring recess.
A two-stroke engine piston comprising:
- a piston top;
- a mantle surface;
- a stratified scavenging channel in the mantle surface;
- and
- a weight reduction space arranged between the piston top and the stratified scavenging channel,
- wherein the weight reduction space has a first axial extent at the mantle surface and a first tangential extent at the mantle surface,
- wherein the first tangential extent is greater than the first axial extent, and
- wherein the weight reduction space comprises a first uppermost delimiting surface at the mantle surface and a second upper delimiting surface radially inside the mantle surface, and wherein the second upper delimiting surface is arranged closer to the piston top than the first uppermost delimiting surface.
Dependencies are inferred from the claim text.