US4455884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Change speed transmission for motorcycles
Assignee: Honda Motor Co Ltd
•
Filing: 1982-02-08
•
Granted: 1984-06-26
•
Expires: 2002-02-08
Abstract
Abstract A change speed transmission device using gears employs a shift drum mounted parallel to the driving and driven shafts. The shift drum is turned one-quarter revolution at a time to cause a shifting mechanism to produce a low speed drive, and an intermediate speed drive, and a high speed drive between the shafts, and then back to neutral. A pivoted pawl engages an abutment on the shaft drum to limit turning movement of the drum. An element frictionally engages a member fixed to rotate with the driven shaft and serves to bias the pawl to engage the abutment so that the shift drum is prevented from turning directly from a high speed shift position to a low speed shift position.
Inventors
- 👤 Kiyofumi Tsuruta
- 👤 Yoshimi Osanai
- 👤 Takanori Onda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:42
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/18; F16H63/00; F16H63/02; F16H63/08; F16H63/16; F16H63/18; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19279; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/20085; Y10T74/20128
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
In a change speed transmission device having an input shaft, an output shaft, and means including gear means for driving the output shaft from the input shaft at any one of a plurality of speed ratios, the improvement comprising, in combination: a shift drum mounted parallel to the shafts and provided with an abutment, means for turning said shift drum, means operated by turning movement of shift drum to select a desired speed ratio between the shafts, a pivoted pawl engageable with said abutment to limit turning movement of said shift drum, a member fixed to rotate with one of the shafts, means frictionally engaging said member for biasing said pawl to engage said abutment, whereby said shift drum is prevented from turning directly from a high speed shift position to a low speed shift position.
Claim 2
Dependent Claim
136 words
In a change speed transmission device having an input shaft, an output shaft, and means including gear means for driving the output shaft from the input shaft at any one of a plurality of speed ratios, the improvement comprising, in combination: a shift drum mounted parallel to the shafts and provided with an abutment, means for turning said shift drum, means operated by turning movement of shift drum to select a desired speed ratio between the shafts, a pivoted pawl engageable with said abutment to limit turning movement of said shift drum, a member fixed to rotate with one of the shafts, means frictionally engaging said member for biasing said pawl to engage said abutment, whereby said shift drum is prevented from turning directly from a high speed shift position to a low speed shift position.
Claim 3
Dependent Claim
20 words
The combination set forth in claim 1 wherein said member comprises a gear forming a part of said gear means.
Claim 4
Dependent Claim
21 words
The combination set forth in claim 1 wherein said abutment comprises a wall of a recess provided on said shift drum.
Claim 5
Dependent Claim
147 words
In a change speed transmission device having an input shaft, an output shaft, and means including gears for driving the output shaft from the input shaft at any one of a plurality of speed ratios, the improvement comprising, in combination: a shift drum mounted parallel to the shafts and provided with a peripheral recess having one wall forming an abutment, means for turning said shift drum, means operated by turning movement of shift drum to select a desired speed ratio between the shafts, a pivoted pawl engageable with said abutment to limit turning of said shift drum, one of the gears being fixed to rotate with one of the shafts, an element frictionally engaging the latter said gear for biasing said pawl to engage said abutment, whereby said shift drum is prevented from turning directly from a high speed shift position to a low speed shift position.
Claim 6
Dependent Claim
147 words
In a change speed transmission device having an input shaft, an output shaft, and means including gears for driving the output shaft from the input shaft at any one of a plurality of speed ratios, the improvement comprising, in combination: a shift drum mounted parallel to the shafts and provided with a peripheral recess having one wall forming an abutment, means for turning said shift drum, means operated by turning movement of shift drum to select a desired speed ratio between the shafts, a pivoted pawl engageable with said abutment to limit turning of said shift drum, one of the gears being fixed to rotate with one of the shafts, an element frictionally engaging the latter said gear for biasing said pawl to engage said abutment, whereby said shift drum is prevented from turning directly from a high speed shift position to a low speed shift position.
Claim 7
Dependent Claim
132 words
In a change speed transmission device having a rotatably mounted input shaft, a rotatably mounted output shaft, and gearing for driving the output shaft from the input shaft at any one of the plurality of speed ratios, the improvement comprising, in combination: a rotatably mounted shift drum having an abuttment thereon, shift linkage extending from said shift drum to said gearing for selecting any one of the plurality of speed ratios, a pawl engagable with said abuttment to limit turning movement of said shift drum and means for sensing movement of said output shaft and selectably biasing said pawl to engage said abuttment, said means for sensing movement of said output shaft and selectably biasing said pawl including an element frictionally coupled with said output shaft and directly coupled to said pawl.
Claim 8
Dependent Claim
132 words
In a change speed transmission device having a rotatably mounted input shaft, a rotatably mounted output shaft, and gearing for driving the output shaft from the input shaft at any one of the plurality of speed ratios, the improvement comprising, in combination: a rotatably mounted shift drum having an abuttment thereon, shift linkage extending from said shift drum to said gearing for selecting any one of the plurality of speed ratios, a pawl engagable with said abuttment to limit turning movement of said shift drum and means for sensing movement of said output shaft and selectably biasing said pawl to engage said abuttment, said means for sensing movement of said output shaft and selectably biasing said pawl including an element frictionally coupled with said output shaft and directly coupled to said pawl.
Claim 9
Dependent Claim
13 words
The combination set forth in claim 5 wherein said element includes a spring.
Claim 10
Dependent Claim
26 words
The combination set forth in claim 5 wherein said pawl is pivotally mounted in the transmission, said shift drum being mounted parallel to the output shaft.
Claim 11
Dependent Claim
22 words
The combination set forth in claim 5 wherein said element frictionally engages a member of the gearing mounted to the output shaft.
References Cited (Backward Citations)
GB128206A
Cited
GB863325A
Cited
DE1147861B
Cited
DE1202665B
Cited
US3421384A
Cited
US3894443A
Cited
DE2826040A1
Cited
JPS57137746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |