Back to results
US 5,144,849 AGranted
Reduction gear
AssigneeOhi Seisakusho Co., Ltd.
InventorsTsutomu Aihara, Akihiro Takeda
Life of this patent
Estimating the term…
Abstract
A reduction gear is shown, which is designed to facilitate assembly of essential parts in a case. The reduction gear comprises a worm; a worm wheel meshed with the worm; a lower case part having a semicylindrical recess which rotatably receives the worm, and an upper case part to be mounted on the lower case part to close the semicylindrical recess. The semicylindrical recess has an opening which is so sized as to permit insertion of the worm into the semicylindrical recess therethrough. A threaded bore is formed in the lower case part, which is merged and aligned with the semicylindrical recess. A bolt is screwed into the threaded bore having its inside end pressed against one axial end of the worm for achieving a stable rotation of the worm in the semicylindrical recess.
Claims12
A reduction gear comprising:
- a worm;
- a worm wheel meshed with said worm;
- a lower case part having a semicylindrical recess which is shaped and sized to rotatably receive said worm, said semicylindrical recess having an opening which is so sized as to permit insertion of said worm into said semicylindrical recess therethrough, said lower case part further having another recess for rotatably receiving said worm wheel;
- an upper case part which is to be mounted on said lower case part to close said semicylindrical recess of said lower case part;
- means for defining in said lower case part a threaded bore which is merged and aligned with said semicylindrical recess;
- a bolt screwed into said threaded bore, said bolt having an inside end which presses one axial end of said worm for achieving a stable rotation of said worm in said semicylindrical recess;
- bearing means disposed between said inside end of said bolt and said one axial end of said worm for assuring the stable rotation of said worm in said semicylindrical recess;
- and
- holding means for stationarily holding said bolt at a given position,
- wherein said worm has first and second shaft parts which extend coaxially outwardly in opposite directions from axial terminal ends of the worm, said second shaft part extending toward said inside end of said bolt;
- and
- wherein said bearing means includes a first sleeve coaxially disposed about said first shaft part;
- a second sleeve coaxially disposed about said second shaft part, and annular ring member having an annular portion which is in contact with an outside end of said second sleeve;
- and a circular seat member disposed between said inside end of said bolt and said annular ring member.
11 more elements
A reduction gear comprising:
- a worm having first and second shaft parts which extend coaxially outwardly in opposite directions from axial terminal ends of said worm;
- first and second sleeves coaxially disposed about said first and second shaft parts respectively;
- a worm wheel meshed with said worm;
- a lower case part having a semicylindrical recess which is shaped and sized to rotatably receive said worm, said semicylindrical recess having an opening which is so sized as to permit insertion of said worm into said semicylindrical recess therethrough, said lower case part further having another recess for rotatably receiving said worm wheel;
- an upper case part which is to be mounted on said lower case part to close said semicylindrical recess of said lower case part;
- means for defining in said lower case part a threaded bore which is merged and aligned with said semicylindrical recess;
- a bolt screwed into said threaded bore, said bolt having an inside end which presses one axial end of said worm for achieving a stable rotation of said worm in said semicylindrical recess, said bolt having an outside end portion projected outward from said threaded bore;
- mutually contacting first and second bearing members which are disposed between said inside end of said bolt and either one of said second shaft part and said second sleeve for promoting the stable rotation of said worm in said semicylindrical recess;
- and
- holding means for stationarily holding said bolt at a given position relative to said lower case, said holding means including a nut operatively disposed about said outside end portion of said bolt, and a wave washer compressed between said nut and an external wall of said lower case part, said wave washer being coaxially secured to a caulked portion of said nut.
7 more elements
A power seat slide device for a motor vehicle, comprising:
- a lower rail secured to a floor of said vehicle, said lower rail having a longitudinally extending rack;
- an upper rail slidably engaged with said lower rail;
- a power unit carried by said upper rail;
- a power transmission cable extending from said power unit and;
- a reduction gear mounted on said upper rail and driven by said power unit through said power transmission cable;
- and
- a pinion driven by said reduction gear and meshed with said rack of said lower rail,
- wherein said reduction gear comprising:
- a worm;
- a worm wheel meshed with said worm;
- a lower case part secured to said upper rail and having a semicylindrical recess which is shaped and sized to rotatably receive said worm, said semicylindrical recess having an opening which is so sized as to permit insertion of said worm into said semicylindrical recess therethrough, said lower case part further having another recess for rotatably receiving said worm wheel;
- an upper case part which is to be mounted on said lower case part to close said semicylindrical recess of said lower case part;
- means for defining in said lower case part a threaded bore which is merged and aligned with said semicylindrical recess;
- a bolt screwed into said threaded bore, said bolt having an inside end which presses one axial end of said worm for achieving a stable rotation of said worm in said semicylindrical recess;
- bearing means disposed between said inside end of said bolt and said one axial end of said worm for assuring the stable rotation of said worm in said semicylindrical recess;
- and holding means for stationarily holding said bolt at a given position.
13 more elements
Dependencies are inferred from the claim text.