GB1122798A - Hydrostatic drive for vehicles - Google Patents
Hydrostatic drive for vehiclesInfo
- Publication number
- GB1122798A GB1122798A GB4454365A GB4454365A GB1122798A GB 1122798 A GB1122798 A GB 1122798A GB 4454365 A GB4454365 A GB 4454365A GB 4454365 A GB4454365 A GB 4454365A GB 1122798 A GB1122798 A GB 1122798A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- pressure
- valve
- control
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/4157—Control of braking, e.g. preventing pump over-speeding when motor acts as a pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/103—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic in combination with other control devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Fluid Gearings (AREA)
- Braking Systems And Boosters (AREA)
- Regulating Braking Force (AREA)
Abstract
1,122,798. Hydrostatic transmissions; hydrodynamic and hydraulic brakes. ROTENBURGER METALLWERKE G.m.b.H. 21 Oct., 1965 [21 Oct., 1964], No. 44543/65. Headings F2D, F2E and F2F. [Also in Division B7] A hydrostatic transmission for a tractor is downshifted by depression of the service brake pedal 24, and the service brakes are then applied by the differential fluid pressure in the working circuit of the transmission. The swashplate control 12 of an engine-driven pump 13, feeding a fixed-capacity motor 18, which drives the rear and/or front wheels of the tractor, is adjusted from zero to maximum, in opposition to a zeroizing spring 14, by fluid-pressure 5 supplied to a cylinder 6 by an engine-driven control pump 1, the output and input lines 5, 10 of which are subject to short-circuit by three by-pass valves 7, 8, 9 and a permanently open adjustable by-pass restrictor 16. The restrictor 16 acts in combination with a performance pedal 3, replacing the usual vehicle accelerator pedal, and acting on a swash-plate 4 controlling the capacity of the control pump 1, whereby control pressure 5, and hence the servo-control 11 of the main pump swash-plate 13, are rendered proportional to depression of the performance pedal 3, which latter thus directly controls vehicle speed through transmission ratio. Release of the performance pedal 3 causes the main swash-plate 13 to downshift slowly towards zero, for engine-braking, at a rate determined by the setting of the by-pass, restrictor 16. Depression of the service brake pedal 24 opens the by-pass valve 8 which provides unrestricted short-circuit of the control pump 1, so that the main pump swash-plate 13 is rapidly downshifted by the spring 14. The pressure subsequently developed in the return line 17b of the main motor 18 acts through lines 26, 28 on a piston 29 acting on the master-cylinder 32 of the service brakes in opposition to pressure 17a, 49 in the supply line 17a of the main motor. The effective pressure on the brake piston 29, and the stage at which it begins to operate the service brake, are determined by an adjustable relief-valve 34 connecting the idle side 30 of the piston to the drive pressure side 17a of the main pump 18. Brake-line pressure 36 is fed to a piston on the valve 8 to provide " feel " of brake-pressure on the pedal 24. A direct mechanical strut 40 to the master cylinder is also provided. A forward-reverse selector-lever 43, operable only in the release position of the performance pedal 3, reverses the input and output lines of the control pump 1 and connects the main motor return line 17b to a reservoir through a valve 27, thus preventing power brake operation in reverse. If power braking is required in both directions, the valve 27 actuated by the reverse lever 43 interchanges the pipes 49 and 26. The additional ratio-shift control by-pass valves 9, 7 act as follows. The by-pass valve 9 is an end-position valve which short-circuits the control-pump 1 when the swash-plate 13 of the main pump 18 reaches maximum capacity position to prevent further increase in capacity and hence vehicle speed. The by-pass valve 7 is a safety-valve which short-circuits the control-pump 1 when main working pressure 17a exceeds a value determined by a loading spring 53 variably compressed by a cam 23a on the rod of the main servo-piston 11.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER0039063 | 1964-10-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1122798A true GB1122798A (en) | 1968-08-07 |
Family
ID=7405678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4454365A Expired GB1122798A (en) | 1964-10-21 | 1965-10-21 | Hydrostatic drive for vehicles |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH443015A (en) |
DE (1) | DE1455841A1 (en) |
GB (1) | GB1122798A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1514756A2 (en) * | 2003-09-12 | 2005-03-16 | Meritor Heavy Vehicle Braking Systems (UK) Limited | Master cylinder |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3543508A (en) * | 1968-10-16 | 1970-12-01 | Hyster Co | Hydrostatic transmission with pressure control |
-
1964
- 1964-10-21 DE DE19641455841 patent/DE1455841A1/en active Pending
-
1965
- 1965-10-21 GB GB4454365A patent/GB1122798A/en not_active Expired
- 1965-10-21 CH CH1453665A patent/CH443015A/en unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1514756A2 (en) * | 2003-09-12 | 2005-03-16 | Meritor Heavy Vehicle Braking Systems (UK) Limited | Master cylinder |
EP1514756A3 (en) * | 2003-09-12 | 2005-08-17 | Meritor Heavy Vehicle Braking Systems (UK) Limited | Master cylinder |
US7107769B2 (en) | 2003-09-12 | 2006-09-19 | Carlisle Brake Products (Uk) Ltd. | Master cylinder |
KR101117372B1 (en) | 2003-09-12 | 2012-03-07 | 메리토르 헤비 비히클 브레이킹 시스템 (유케이) 리미티드 | An assembly of master cylinder and dump valve |
Also Published As
Publication number | Publication date |
---|---|
DE1455841A1 (en) | 1969-08-07 |
CH443015A (en) | 1967-08-31 |
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