US3776056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear shifting assembly for change-speed transmission
Assignee: Robert Bosch GmbH
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Filing: 1972-08-04
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Granted: 1973-12-04
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Expires: 1992-08-04
Abstract
Abstract A gear shifting assembly for changing the speed positions of transmissions in automotive vehicles has a double-acting gear shifting cylinder receiving oil by way of a directional control valve which is actuatable by oil in dependency on a pressure differential between the cylinder chambers. The directional control valve receives oil from a pump by way of an adapter valve which is controlled by an adjustable pressure regulating valve. The pressure of oil which moves the piston in the double-acting cylinder depends on the selected speed position of transmission and such pressure develops when the piston encounters a resistance to its movement in the cylinder.
Inventors
- 👤 H Espenschied
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:56
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/26; F16H61/28; F16H61/30; F16H61/2807; F16H2061/307; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19433
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
262 words
A gear shifting assembly for changing the speed positions of a transmission, comprising a fluid-operated gear selector motor having a first output element movable in a first direction; a fluid-operated gear shifting motor having a second output element movable in a second direction normal to said first direction, said gear shifting motor having a cylinder, a piston reciprocable in said cylinder and connected with said second output element, a pair of fluid-admitting ports provided in said cylinder at the opposite sides of said piston, and a plurality of outlet ports provided in said cylinder, said piston being movable in said cylinder between a neutral position in which said piston seals one of said outlet ports and at least one operative position in which said piston seals another of said outlet ports; a source of pressurized fluid; a directional control valve connected with said inlet ports; a normally closed shutoff valve provided in each of said outlet ports, said piston being movable in said cylinder to a position in which it seals that port whose shutoff valve is open in response to admission of pressurized fluid by way of said directional control valve; an adapter valve interposed between said source and said directional control valve; and an adjustable pressure regulating valve connected to said source and to said adapter valve to determine the pressure of fluid which is admitted to said directional control valve by way of said adapter valve in dependency on the selected speed position of the transmission and in response to development of a resistance to movement of said piston.
Claim 2
Dependent Claim
262 words
A gear shifting assembly for changing the speed positions of a transmission, comprising a fluid-operated gear selector motor having a first output element movable in a first direction; a fluid-operated gear shifting motor having a second output element movable in a second direction normal to said first direction, said gear shifting motor having a cylinder, a piston reciprocable in said cylinder and connected with said second output element, a pair of fluid-admitting ports provided in said cylinder at the opposite sides of said piston, and a plurality of outlet ports provided in said cylinder, said piston being movable in said cylinder between a neutral position in which said piston seals one of said outlet ports and at least one operative position in which said piston seals another of said outlet ports; a source of pressurized fluid; a directional control valve connected with said inlet ports; a normally closed shutoff valve provided in each of said outlet ports, said piston being movable in said cylinder to a position in which it seals that port whose shutoff valve is open in response to admission of pressurized fluid by way of said directional control valve; an adapter valve interposed between said source and said directional control valve; and an adjustable pressure regulating valve connected to said source and to said adapter valve to determine the pressure of fluid which is admitted to said directional control valve by way of said adapter valve in dependency on the selected speed position of the transmission and in response to development of a resistance to movement of said piston.
Claim 3
Dependent Claim
115 words
A gear shifting assembly as defined in claim 1, wherein said adapter valve comprises a body, a valve member reciprocable in said body and defining therewith an annular control chamber, said valve member having an annular surface at one end of said control chamber and a first end face defining with said body a second chamber communicating with said control chamber, the pressure of fluid in said second chamber being a function of the position of said valve member relative to said body and said valve member further having a second end face, and means for moving said valve member by way of said second end face under the control of said pressure regulating valve.
Claim 4
Dependent Claim
24 words
A gear shifting assembly as defined in claim 2, wherein said means for moving said valve member comprises a spring-biased plunger in said body.
Claim 5
Dependent Claim
42 words
A gear shifting assembly as defined in claim 3, further comprising conduit means connecting said body with said pressure regulating valve so that the fluid admitted into said body by way of said conduit means assists the spring bias upon said plunger.
Claim 6
Dependent Claim
135 words
A gear shifting assembly as defined in claim 1, wherein said pressure regulating valve comprises a body and a valve member received in said body and defining therewith an annular control chamber, said body having a fluid-admitting inlet connected with said source, a first outlet connected with said adapter valve and a second outlet, said valve member being movable in said body between first and second positions in which said inlet is respectively connected with said first and second outlets, said valve member having an end face defining with said body a second chamber communicating with said control chamber whereby the fluid pressure in said second chamber depends on the position of said valve member, said valve member further having a second end face and further comprising adjustable abutment means for said second end face.
Claim 7
Dependent Claim
22 words
A gear shifting assembly as defined in claim 5, further comprising resilient means interposed between said valve member and said abutment means.
Claim 8
Dependent Claim
17 words
A gear shifting assembly as defined in claim 5, further comprising means for adjusting said abutment means.
Claim 9
Dependent Claim
17 words
A gear shifting assembly as defined in claim 7, wherein said ajusting means comprises an electromagnetic servomotor.
Claim 10
Dependent Claim
15 words
A gear as defined in claim 7, wherein said adjusting means comprises a movable cam.
Claim 11
Dependent Claim
25 words
A gear shifting assembly as defined in claim 9, further comprising means for moving said cam in response to movement of said first output element.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |