Control systems for steplessly-variable ratio transmissions
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16H-037/06
F16H-015/00
F16H-013/00
출원번호
US-0050745
(1979-06-21)
우선권정보
GB-0027744 (1978-06-23)
발명자
/ 주소
Perry Forbes G. deB. (Forest Row GB2)
출원인 / 주소
National Research Development Corporation (London GB2 03)
인용정보
피인용 횟수 :
31인용 특허 :
1
초록▼
A steplessly variable ratio transmission unit with swingable rollers (11, 12) interconnecting input and output toroidal discs (1, 2, 10), the swing of the rollers (11, 12) being controlled by a ratio actuator (146, 148) supplied by a pump (174) at a pressure controlled by a ratio valve (186). At an
A steplessly variable ratio transmission unit with swingable rollers (11, 12) interconnecting input and output toroidal discs (1, 2, 10), the swing of the rollers (11, 12) being controlled by a ratio actuator (146, 148) supplied by a pump (174) at a pressure controlled by a ratio valve (186). At an end of the stroke of the ratio actuator an end-stop valve (150) is actuated to constrict the flow to the ratio valve (186), and the raised pressure up-stream of a constriction (140, 142) in valve 150 acts on a piston (140) of that valve urging the ratio actuator (146, 148) away from the end of its stroke so that the rollers (11, 12) cannot run off the discs (1, 2, 10). A complete transmission system provides a First Regime with recirculation in planetary gearing and a Second Regime with drive through the transmission unit alone. In First Regime, at the lowest transmission unit ratio, that ratio and the overall system ratio are the same. The gearing comprises a “mixing” epicyclic gear (76) with pairs of meshed planet pinions (80, 126) and a simple “matching”epicyclic gear (107) the annuli (78, 113) whereof are coupled together, the transmission unit (1, 2, 10, 11, 12) being bridged across the sun gears (75, 108), the system output (104) being taken from the mixing epicyclic planet carrier (77). The matching epicyclic planet carrier (110) is “earthed”via a sprag (115, 118) to establish First Regime. A Second Regime clutch (89) locks up the mixing epicyclic whereupon the sprag (115, 118) overruns to release First Regime automatically.
대표청구항▼
A control system for a steplessly variable ratio transmission unit of the type having an input disc and an output disc which have facing surfaces forming part of a torus and which are mounted for rotation about a common main axis, there being at least one roller in driving engagement with the toroid
A control system for a steplessly variable ratio transmission unit of the type having an input disc and an output disc which have facing surfaces forming part of a torus and which are mounted for rotation about a common main axis, there being at least one roller in driving engagement with the toroidal surfaces of the discs, the or each roller having a mounting permitting it to swivel about a ratio change axis substantially tangential to the centre circle of the torus of which the surfaces of the discs form part, whereby the speed ratio between the input and the output disc may be changed, the roller mounting also permitting limited bodily translation of the roller substantially along the line of the ratio change axis whereby a change in the said ratio is initiated, any translational position of the roller mounting along this line having a corresponding equilibrium ratio, the transmission unit comprising also a ratio actuator coupled to the roller mountings opposing the driving torque reaction of the rollers, an end-load actuator urging the discs together into driving engagement with the or each roller, a source of pressurised fluid for the ratio actuator and the end-load actuator, the control system comprising a ratio control valve which valve is operable to control the fluid pressure from the source to a required extent to produce a required ratio by means of the ratio actuator and a corresponding end-load on the discs by means of the end-load actuator the control system further comprising end-stop valve means operable, via a mechanical connection, by the ratio actuator at or near to one end at least of its permissible stroke, to constrict the fluid connection to the ratio control valve so that the pressure from the source is no longer solely under control of the ratio control valve and rises up-stream of the end-stop valve meaans, which comprises a cylinder space and a movable member the fluid pressure from the source being introduced into the cylinder space, the rising pressure on operation of the end-stop valve means, acting in the said cylinder space upon a piston face of the movable member in a sense urging the ratio actuator away from the end of its stroke, the end-load actuator being connected to the pressurised fluid source up-stream of the end-stop valve means.
Hoge Forrest William ; McCarrick Daniel Warren ; Beim Rudolf, Dual cavity torodial traction drive transmission having multiple speed inputs to a planetary gear unit.
Robinson Leslie K. (16 Cedarwood Drive Leyland Preston ; Lancashire PR5 1HN GB2), Relating to ram units in transmissions of the toroidal race, rolling traction type.
Hoge Forrest William ; McCarrick Daniel Warren ; Beim Rudolf, Toroidal traction drive transmission having multiple speed inputs to a planetary gear unit.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.