US3889547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically selectable gear transmission
Assignee: LO LIAN SHENG
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Filing: 1973-09-13
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Granted: 1975-06-17
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Expires: 1993-09-13
Abstract
Abstract The specification describes a gear transmission especially for automotive use having a larger number of gear ratios than usual provided in a smaller housing in such manner that the gears are not physically moved but wherein the drive shaft embodies a selector adapted to provide a drive connection between the drive shaft and a selected drive gear. Especially however the transmission of the invention provides for an automatic shift in gear ratio responsive to engine speed and load.
Inventors
- 👤 Jun-Kai Sun
- 👤 Lian-Sheng Lo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/02; F16H3/08; F16H3/083; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926; Y10T74/19279; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19442; Y10T74/19451; Y10T74/19465
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
319 words
In a gear transmission having drive and driven shafts in parallel spaced apart relationship in a housing and gear pairs of different drive ratios for transmitting drive from said drive shaft through a selected pair of gears to said driven shaft, the combination for hydraulically selecting a gear pair ratio comprising: means on said drive and driven shafts rotatably mounting the gears thereof in predetermined non-shiftable spaced apart positions thereon in meshing relationship of each gear pair, the gears on said drive shaft at least being freely rotatable thereon; a selector movable longitudinally of said drive shaft and having an actuator rod coaxially connected thereto said selector when positioned at a drive gear being adapted to establish a mechanical drive relationship between the drive shaft and said drive gear; an hydraulic cylinder having an inlet chamber and an outlet chamber separated by a piston and a piston rod extending therefrom to position said actuator rod and the selector of said transmission drive shaft; a compressible gas containing accumulator for said outlet chamber; a fluid pump and means for driving same responsive to the speed of said drive shaft; an hydraulic fluid sump connected to said pump; an outlet line for said pump delivering pumped fluid to the inlet chamber of said cylinder; means returning fluid from said outlet line to said sump and limiting the pressure in said outlet line and said inlet chamber to a predetermined maximum equal to the pressure in said accumulator thereby to define a thus selected position of said piston together with said selector; means for returning fluid from said outlet line to said sump, each of said means limiting the pressure in said outlet line to different predetermined value; and a manually operable selector valve selectively connecting any one of said fluid returning means to said sump thereby defining the drive ratio of said transmission by the gear pair position of said selector.
Claim 2
Dependent Claim
319 words
In a gear transmission having drive and driven shafts in parallel spaced apart relationship in a housing and gear pairs of different drive ratios for transmitting drive from said drive shaft through a selected pair of gears to said driven shaft, the combination for hydraulically selecting a gear pair ratio comprising: means on said drive and driven shafts rotatably mounting the gears thereof in predetermined non-shiftable spaced apart positions thereon in meshing relationship of each gear pair, the gears on said drive shaft at least being freely rotatable thereon; a selector movable longitudinally of said drive shaft and having an actuator rod coaxially connected thereto said selector when positioned at a drive gear being adapted to establish a mechanical drive relationship between the drive shaft and said drive gear; an hydraulic cylinder having an inlet chamber and an outlet chamber separated by a piston and a piston rod extending therefrom to position said actuator rod and the selector of said transmission drive shaft; a compressible gas containing accumulator for said outlet chamber; a fluid pump and means for driving same responsive to the speed of said drive shaft; an hydraulic fluid sump connected to said pump; an outlet line for said pump delivering pumped fluid to the inlet chamber of said cylinder; means returning fluid from said outlet line to said sump and limiting the pressure in said outlet line and said inlet chamber to a predetermined maximum equal to the pressure in said accumulator thereby to define a thus selected position of said piston together with said selector; means for returning fluid from said outlet line to said sump, each of said means limiting the pressure in said outlet line to different predetermined value; and a manually operable selector valve selectively connecting any one of said fluid returning means to said sump thereby defining the drive ratio of said transmission by the gear pair position of said selector.
Claim 3
Dependent Claim
88 words
The transmission of claim 1; a reverse gear on said drive shaft separated from the nearest of the other gears thereon by a free gap adapted to accommodate said selector in a neutral position, said other gears defining different drive positions and being so arranged that the smallest diameter of said other gears is next said gap and the remainder progress larger in diameter along said shaft in further positions from neutral; and a speed responsive clutch in said reverse drive gear and in said first drive gear
Claim 4
Dependent Claim
119 words
The transmission of claim 1; a reverse gear on said drive shaft separated from the nearest of the other gears thereon by a free gap adapted to accommodate said selector in A neutral position, said other gears defining different drive positions and being so arranged that the smallest diameter of said other gears is next said gap and the remainder progress larger in diameter along said shaft in further positions from neutral; a speed responsive clutch in said reverse drive gear and in said first drive gear; and means positioning said selector at the reverse gear of said drive shaft at zero engine speed and at the lowest maximum pressure position of said selector valve at all engine speeds.
Claim 5
Dependent Claim
112 words
The transmission of claim 1; a reverse gear on said drive shaft separated from the nearest of the other gears thereon by a free gap adapted to accommodate said selector in a neutral position, said other gears defining different drive positions and being so arranged that the smallest diameter of said other gears is next said gap and the remainder progress larger in diameter along said shaft in further positions from neutral; a speed responsive clutch in said reverse drive gear and said first drive gear; and means positioning said selector at the free gap neutral position of said drive shaft at the next to lowest pressure position of said selector valve.
Claim 6
Dependent Claim
167 words
The transmission of claim 1; a reverse gear on said drive shaft separated from the nearest of the other gears thereon by a free gap adapted to accommodate said selector in a neutral position, said other gears defining different drive positions and being so arranged that the smallest diameter of said other gears is next said gap and the remainder progress larger in diameter along said shaft in further positions from neutral; a speed responsive clutch in said reverse drive gear and in said first drive gear; means positioning said selector at a drive gear of predetermined diameter greater than that of said smallest diameter drive gear at a pressure position of said selector valve selecting a greater maximum pressure for said cylinder inlet chamber whereby at drive shaft speeds less than that obtaining said pressure said cylinder piston retracts to connect a drive gear of lesser diameter to said drive shaft responsive to drive shaft speed at outlet line pressures greater than said neutral position maximum.
Claim 7
Dependent Claim
209 words
The transmission of claim 1; a reverse gear on said drive shaft separated from the nearest of the other gears thereon by a free gap adapted to accommodate said selector in a neutral position, said other gears defining different drive positions and being so arranged that the smallest diameter of said other gears is next said gap and the remainder progress larger in diameter along said shaft in further positions from neutral; a speed responsive clutch in said reverse drive gear and in said first drive gear; means positioning said selector at a drive gear of predetermined diameter greater than that of said smallest diameter drive gear at a pressure position of said selector valve selecting a greater maximum pressure for said cylinder inlet chamber whereby at drive shaft speeds less than that obtaining said pressure, said cylinder piston retracts to connect a drive gear of lesser diameter to said drive shaft responsive to drive shaft speed at outlet line pressures greater than said neutral position maximum, the said drive gear of predetermined diameter being the drive gear of maximum diameter of the drive gear series corresponding to a drive position for said valve selector connecting the highest maximum pressure return line of said plural means to said sump.
Claim 8
Dependent Claim
217 words
The transmission of claim 1; a reverse gear on said drive shaft separated from the nearest of the other gears thereon by a free gap adapted to accommodate said selector in a neutral position, said other gears defining different drive positions being so arranged that the smallest diameter of said other gears is next said gap and the remainder progress larger in diameter along said shaft in further positions from neutral; a speed responsive clutch in said reverse drive gear and said first drive gear; and means positioning said selector at a drive gear of predetermined diameter greater than that of said smallest diameter drive gear at a pressure position of said selector valve selecting a greater maximum pressure for said cylinder inlet chamber whereby at drive shaft speeds less than that obtaining said pressure, said cylinder piston retracts to connect a drive gear of lesser diameter to said drive shaft responsive to drive shaft speed at outlet line pressures greater than said neutral position maximum, said drive gear of predetermined diameter being the drive gear of maximum diameter of the drive gear series corresponding to a drive position for said valve selector connecting the highest maximum pressure return line of said plural means to said sump, the number of drive gears being not less than six.
Claim 9
Dependent Claim
31 words
The transmission of claim 1 and one way clutches connecting certain of said driven gears to said driven shaft, the others of said driven gears being fixed to said driven shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |