US5071391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepless speed changing hydrostatic transmission
Assignee: Shimadzu Corp
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Filing: 1987-11-20
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Granted: 1991-12-10
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Expires: 2007-11-20
Abstract
Abstract A stepless speed change gear comprising a differential gear mechanism forming high and low speed side mechanical transmission systems, a variable speed hydraulic transmission mechanism consisting of two hydraulic pumps/motors joined with the differential gear mechanism and two synchromesh type intermittent on-off power mechanisms for high and low speed engagement of the transmission system outputs. When connection is made to the high speed side synchromesh type intermittent power on-off mechanism at the time when the high speed side rotational speed approaches the low speed side rotational speed with the low speed side synchromesh type intermittent power on-off mechanism connected, the high speed side synchromesh type intermittent power mechanism will automatically be connected. By switching the low speed side synchromesh type intermittent power on-off making mechanism into its non-connected state, switching from low to high speed mode may be made.
Inventors
- 👤 Yasuo Kita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:09
CPC Classifications
F; F16; F16H; F16H35/00; F16H35/02; F16H47/00; F16H47/02; F16H47/04; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/0866; F16H2037/0873; F16H2200/00; F16H2200/20; F16H2200/203; F16H2200/2064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
389 words
A stepless speed change gear comprising: a differential gear mechanism having a first, second and third input/output ends and forming a low speed mechanical transmission system which passes between said first and second input/output ends and a high speed mechanical transmission system which passes between said first and third input/output ends; a stepless speed change mechanism having first and second input/output shafts, one of said first and second input/output shafts being connected to said second input/output end of said low speed mechanical transmission system of said differential gear mechanism and the other of said input/output shafts being connected to said third input/output end of said high speed mechanical system of said differential gear mechanism; means for selectively increasing and decreasing the input/output to one of said input/output shafts while decreasing and increasing the output/input to the other of said input/output shafts; a common rotary element intermediate a transmission end of each of said low speed and high speed mechanical transmission systems; a low speed synchromesh type intermittent power on-off mechanism at one side of said common rotary element and having a first sleeve for engaging and disengaging said transmission end of said low speed mechanical transmission system with said one side of said common rotary element; a high speed synchromesh type intermittent power on-off mechanism at the other side of said common rotary element and having a second sleeve for engaging and disengaging said transmission end of said high speed mechanical transmission system with said other side of said common rotary element; and a switch mechanism for selectively engaging said first sleeve of low speed synchromesh power on-off mechanism with said one side of said common rotary element and disengaging said second sleeve of said high speed synchromesh power on-off mechanism with said other side of said common rotary element when the input/output speed of said input/output shafts are decreased to a low speed of said low speed synchromesh power on-off mechanism and selectively engaging said second sleeve of said high speed synchromesh power on-off mechanism with said other side of said common rotary element and disengaging said first sleeve of said low speed synchromesh power on-off mechanism with said one side of said common rotary element when the input/output speed of said input/output shafts are increased to a high speed of said high speed synchromesh power on-off mechanism.
Claim 2
Dependent Claim
389 words
A stepless speed change gear comprising: a differential gear mechanism having a first, second and third input/output ends and forming a low speed mechanical transmission system which passes between said first and second input/output ends and a high speed mechanical transmission system which passes between said first and third input/output ends; a stepless speed change mechanism having first and second input/output shafts, one of said first and second input/output shafts being connected to said second input/output end of said low speed mechanical transmission system of said differential gear mechanism and the other of said input/output shafts being connected to said third input/output end of said high speed mechanical system of said differential gear mechanism; means for selectively increasing and decreasing the input/output to one of said input/output shafts while decreasing and increasing the output/input to the other of said input/output shafts; a common rotary element intermediate a transmission end of each of said low speed and high speed mechanical transmission systems; a low speed synchromesh type intermittent power on-off mechanism at one side of said common rotary element and having a first sleeve for engaging and disengaging said transmission end of said low speed mechanical transmission system with said one side of said common rotary element; a high speed synchromesh type intermittent power on-off mechanism at the other side of said common rotary element and having a second sleeve for engaging and disengaging said transmission end of said high speed mechanical transmission system with said other side of said common rotary element; and a switch mechanism for selectively engaging said first sleeve of low speed synchromesh power on-off mechanism with said one side of said common rotary element and disengaging said second sleeve of said high speed synchromesh power on-off mechanism with said other side of said common rotary element when the input/output speed of said input/output shafts are decreased to a low speed of said low speed synchromesh power on-off mechanism and selectively engaging said second sleeve of said high speed synchromesh power on-off mechanism with said other side of said common rotary element and disengaging said first sleeve of said low speed synchromesh power on-off mechanism with said one side of said common rotary element when the input/output speed of said input/output shafts are increased to a high speed of said high speed synchromesh power on-off mechanism.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |