Suction tube unit of stratified scavenging engine
AssigneeYamabiko Corporation
InventorsHisato Ohsawa, Takahiro Yamazaki, Hidekazu Tsunoda
Life of this patent
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Abstract
A suction tube unit connected between a cylinder block and a carburetor in a stratified scavenging engine has a suction tube for mixture made of an elastic material; and a suction tube for stratified scavenging air made of an elastic material. The suction tube for mixture and the suction tube for air have, at respective inlet ends connected to the carburetor, respective wall portions which face each other and have complementary shapes. A clearance space is provided between the wall portions of the suction tube for mixture and the suction tube for air.
Claims7
A suction tube unit for a carburetor having one bore including a mixture-flow passage and a scavenging-air-flow passage, the passages being defined on opposite sides of a full-opened butterfly-type valve, the suction tube unit comprising:
- a suction tube for mixture, the suction tube for mixture being made of an elastic material;
- a suction tube for stratified scavenging air, the suction tube for air being made of an elastic material, and
- an adapter disposed between the carburetor and the suction tube for mixture and between the carburetor and the suction tube for air,
- wherein the suction tube for mixture and the suction tube for air have, at respective inlet ends connected to the adapter, respective wall portions which face each other and have complementary shapes,
- wherein a clearance space is provided between the wall portions of the suction tube for mixture and the suction tube for air,
- wherein the adapter has one bore, and
- wherein a single partition aligning with the wall portions of the suction tube for mixture and the suction tube for air is provided in the one bore, and the partition has a recess fitted to the wall portions of the suction tube for mixture and the suction tube for air.
A stratified scavenging engine comprising:
- a suction tube unit, comprising:
- a suction tube for mixture, the suction tube for mixture being made of an elastic material;
- a suction tube for stratified scavenging air, the suction tube for air being made of an elastic material,
- a carburetor having one bore including a mixture-flow passage and a scavenging-air-flow passage, the passages being defined on opposite sides of a full-opened butterfly-type valve, and
- an adapter disposed between the carburetor and the suction tube for mixture and between the carburetor and the suction tube for air,
- wherein the suction tube for mixture and the suction tube for air have, at respective inlet ends connected to the adapter, respective wall portions which face each other and have complementary shapes,
- wherein a clearance space is provided between the wall portions of the suction tube for mixture and the suction tube for air;
- wherein the adapter has one bore;
- and
- wherein a single partition aligning with the wall portions of the suction tube for mixture and the suction tube for air is provided in the one bore, and the partition has a recess fitted to the wall portions of the suction tube for mixture and the suction tube for air.
Dependencies are inferred from the claim text.