US3886689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming a trochoidal surface
Assignee: Mazda Motor Corp
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Filing: 1973-10-04
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Granted: 1975-06-03
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Expires: 1993-10-04
Abstract
Abstract An apparatus for forming trochoidal surface which can form the trochoidal surface with three tools. The apparatus comprises a stationary sun gear, three planetary gears disposed around and meshing with said sun gear at equi-distant angular positions, each of said planetary gears having gear ratio of 1:2 to said sun gear, a rotatable forming tool having a working surface and mounted on the planetary gear with said working surface positioned at a point offset by a predetermined distance from center of said planetary gear, and means for producing revolutional movements of said planetary gears.
Inventors
- 👤 Tsutomu Yoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:07
CPC Classifications
B; B23; B23Q; B23Q27/00; B23Q27/006; Y; Y10; Y10S; Y10S451/00; Y10S451/919; Y10T; Y10T409/00; Y10T409/30; Y10T409/304368
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
275 words
Apparatus for forming a trochoidal surface comprising a stationary sun gear, a plurality of planetary gears disposed around and meshing with said sun gear at equ-distant angular positions, each of said planetary gears having a gear ratio of 1: 2 to said sun gear, a plurality of rotatable forming tools each having a working surface, one of said forming tools being mounted on each of the planetary gears so that the forming tool working surface is positioned at a point offset by a predetermined distance from the center of the associated planetary gear, means for revolving said planetary gears, a plurality of tool mounting heads for mounting each of said forming tools on the associated planetary gear, each of said tool mounting heads comprising a swingable arm axially slidably engaging said tool and a planetary gear shaft for carrying said swingable arm, said shaft being coaxial with said offset point on the associated planetary gear, a plurality of levers extending along a line through said offset point on each planetary gear and intersecting said meshing point between the related planetary gear and the sun gear, said lever having one end longitudinally slidably receiving the related swingable arm, the other end of the lever being pivotally mounted on a member which is rotatable about an axis coaxial with said sun gear at a common point offset from the axis of the sun gear a distance equal to two times the offset distance of the offset point associated with each planetary gear, and means for displacing each of said forming tools along said swingable arm so as to compensate for any wear of the working surface thereof.
Claim 2
Dependent Claim
275 words
Apparatus for forming a trochoidal surface comprising a stationary sun gear, a plurality of planetary gears disposed around and meshing with said sun gear at equ-distant angular positions, each of said planetary gears having a gear ratio of 1: 2 to said sun gear, a plurality of rotatable forming tools each having a working surface, one of said forming tools being mounted on each of the planetary gears so that the forming tool working surface is positioned at a point offset by a predetermined distance from the center of the associated planetary gear, means for revolving said planetary gears, a plurality of tool mounting heads for mounting each of said forming tools on the associated planetary gear, each of said tool mounting heads comprising a swingable arm axially slidably engaging said tool and a planetary gear shaft for carrying said swingable arm, said shaft being coaxial with said offset point on the associated planetary gear, a plurality of levers extending along a line through said offset point on each planetary gear and intersecting said meshing point between the related planetary gear and the sun gear, said lever having one end longitudinally slidably receiving the related swingable arm, the other end of the lever being pivotally mounted on a member which is rotatable about an axis coaxial with said sun gear at a common point offset from the axis of the sun gear a distance equal to two times the offset distance of the offset point associated with each planetary gear, and means for displacing each of said forming tools along said swingable arm so as to compensate for any wear of the working surface thereof.
Claim 3
Dependent Claim
275 words
Apparatus for forming a trochoidal surface comprising a stationary sun gear, a plurality of planetary gears disposed around and meshing with said sun gear at equ-distant angular positions, each of said planetary gears having a gear ratio of 1: 2 to said sun gear, a plurality of rotatable forming tools each having a working surface, one of said forming tools being mounted on each of the planetary gears so that the forming tool working surface is positioned at a point offset by a predetermined distance from the center of the associated planetary gear, means for revolving said planetary gears, a plurality of tool mounting heads for mounting each of said forming tools on the associated planetary gear, each of said tool mounting heads comprising a swingable arm axially slidably engaging said tool and a planetary gear shaft for carrying said swingable arm, said shaft being coaxial with said offset point on the associated planetary gear, a plurality of levers extending along a line through said offset point on each planetary gear and intersecting said meshing point between the related planetary gear and the sun gear, said lever having one end longitudinally slidably receiving the related swingable arm, the other end of the lever being pivotally mounted on a member which is rotatable about an axis coaxial with said sun gear at a common point offset from the axis of the sun gear a distance equal to two times the offset distance of the offset point associated with each planetary gear, and means for displacing each of said forming tools along said swingable arm so as to compensate for any wear of the working surface thereof.
Claim 4
Dependent Claim
275 words
Apparatus for forming a trochoidal surface comprising a stationary sun gear, a plurality of planetary gears disposed around and meshing with said sun gear at equ-distant angular positions, each of said planetary gears having a gear ratio of 1: 2 to said sun gear, a plurality of rotatable forming tools each having a working surface, one of said forming tools being mounted on each of the planetary gears so that the forming tool working surface is positioned at a point offset by a predetermined distance from the center of the associated planetary gear, means for revolving said planetary gears, a plurality of tool mounting heads for mounting each of said forming tools on the associated planetary gear, each of said tool mounting heads comprising a swingable arm axially slidably engaging said tool and a planetary gear shaft for carrying said swingable arm, said shaft being coaxial with said offset point on the associated planetary gear, a plurality of levers extending along a line through said offset point on each planetary gear and intersecting said meshing point between the related planetary gear and the sun gear, said lever having one end longitudinally slidably receiving the related swingable arm, the other end of the lever being pivotally mounted on a member which is rotatable about an axis coaxial with said sun gear at a common point offset from the axis of the sun gear a distance equal to two times the offset distance of the offset point associated with each planetary gear, and means for displacing each of said forming tools along said swingable arm so as to compensate for any wear of the working surface thereof.
Claim 5
Dependent Claim
62 words
Apparatus according to claim 1, including a plurality of tool shafts, each of said tools being mounted on an associated tool shaft, said planetary gear shafts being offset from said tool shafts, and means for transmitting rotation between said planetary gear shafts and said tool shafts, said means being mounted to allow relative displacement between said planetary shafts and said tool shafts.
Claim 6
Dependent Claim
10 words
Apparatus in accordance with claim 1 including three planetary gears.
Claim 7
Dependent Claim
17 words
Apparatus in accordance with claim 1 in which each of said forming tools comprises a grinding wheel.
Claim 8
Dependent Claim
18 words
Apparatus in accordance with claim 1 in which each of said forming tools comprises a rotatable cutting tool.
Claim 9
Dependent Claim
31 words
Apparatus in accordance with claim 1 in which each of said levers is of a bifurcated shape and slidably receives a related swingable arm in an outwardly opening axially extending slit.
Claim 10
Dependent Claim
46 words
Apparatus in accordance with claim 2 iN which each of said tool feeding means comprises a bearing block rotatably carrying the associated tool shaft and being carried by the associated swingable arm slidably along the associated lever, and fluid pressure means for moving said bearing block.
Claim 11
Dependent Claim
34 words
Apparatus in accordance with claim 2 in which each of said tools comprises a honing wheel and mounting means on said tool shafts for permitting swinging movement of the tool within a limited range.
Claim 12
Dependent Claim
47 words
Apparatus in accordance with claim 1 in which each of said tools is mounted on a tool shaft which is offset from the associated planetary gear shaft, means for rotating said tool shaft through a rotation transmitting mechanism, said means allowing relative displacement between said two shafts.
References Cited (Backward Citations)
US2693066A
Cited
US2870578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |