Patent EP0209286A1 successfully refreshed from Google Patents.
EP0209286A1
Expired / Lapsed
EP
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Static hydraulic continuously variable transmission
Assignee: Honda Motor Co Ltd
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Filing: 1986-06-27
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Granted: —
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Expires: 2006-06-27
Abstract
Abstract A static hydraulic continuously variable transmission (T) which is disclosed herein includes a cylinder block (B) which is secured to an output shaft (25) and constituted of a pump cylinder (7) of a hydraulic pump (P) and of a motor cylinder (17) of a hydraulic motor (M), these cylinders (7, 17) being connected to each other. In the transmission (T), a number of pump cylinder bores (8) and a number of motor cylinder bores (18) are annularly arranged respectively. The transferring of a working oil out of one into another of the pump cylinder bores (8) and the motor cylinder bores (18) is conducted through a pair of oil chambers (40, 41) concentrically provided around the output shaft (25), and the communication between these cylinder bores (8, 18) is controlled by a number of first and second dispensing valves (45, 46) extending between both the oil chambers (40, 41) and adapted to be reciprocally radially moved. There is no relatively sliding portion between the pump cylinder (7) and the motor cylinder (17). Thus, the transferring of the working oil is reliably conducted and a higher transmitting efficiency is provided.
Inventors
- 👤 Tsutomu Hayashi
- 👤 Mitsuru Saito
- 👤 Kazuhito Ito
- 👤 Yoshihiro Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 14:08
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/04; F16H39/06; F16H39/08; F16H39/10; F16H39/14; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/423
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
307 words
A static hydraulic continuously variable transmission including a hydraulic closed circuit formed between a swashplate type hydraulic pump and a swashplate type hydraulic motor, wherein: a cylinder block comprised of a pump cylinder in said hydraulic pump and a motor cylinder in said hydraulic pump, which are interconnected,is secured to an output shaft; a pair of annular oil chambers are concentrically defined around said output shaft between a number of annularly arranged cylinder bores of said pump cylinder and a number of annularly arranged cylinder bores of said motor cylinder: a number of first dispensing valves and a number of second dispensing valves are radially arranged respectively, said first dispensing valves being adapted to be reciprocally moved between radially outer and inner positions to alternately bring the cylinder bores of said pump cylinder respectively into communication with said oil chambers, and said second dispensing valves being adapted to be reciprocally moved between radially outer and inner positions to alternately bring the cylinder bores of said motor cylinder respectively into communication with said oil chambers: a common eccentric ring is engaged with said individual first dispensing valves for imparting the reciprocal movement to said dispensing valves with the relative rotation between said cylinder block and an input member of said hydraulic pump; and a common second eccentric ring is engaged with said individual second dispensing valves for imparting the reciprocal movement to said dispensing valves with the rotation of the cylinder block; whereby each cylinder bore of said pump cylinder is brought into communication with one of said oil chambers during the discharge stroke thereof and with the other chamber during the suction stroke thereof, while each cylinder bore of said motor cylinder is brought into communication with one of said oil chambers during the expansion stroke thereof and with the other chamber during the contraction stroke thereof.
Claim 2
Dependent Claim
307 words
A static hydraulic continuously variable transmission including a hydraulic closed circuit formed between a swashplate type hydraulic pump and a swashplate type hydraulic motor, wherein: a cylinder block comprised of a pump cylinder in said hydraulic pump and a motor cylinder in said hydraulic pump, which are interconnected,is secured to an output shaft; a pair of annular oil chambers are concentrically defined around said output shaft between a number of annularly arranged cylinder bores of said pump cylinder and a number of annularly arranged cylinder bores of said motor cylinder: a number of first dispensing valves and a number of second dispensing valves are radially arranged respectively, said first dispensing valves being adapted to be reciprocally moved between radially outer and inner positions to alternately bring the cylinder bores of said pump cylinder respectively into communication with said oil chambers, and said second dispensing valves being adapted to be reciprocally moved between radially outer and inner positions to alternately bring the cylinder bores of said motor cylinder respectively into communication with said oil chambers: a common eccentric ring is engaged with said individual first dispensing valves for imparting the reciprocal movement to said dispensing valves with the relative rotation between said cylinder block and an input member of said hydraulic pump; and a common second eccentric ring is engaged with said individual second dispensing valves for imparting the reciprocal movement to said dispensing valves with the rotation of the cylinder block; whereby each cylinder bore of said pump cylinder is brought into communication with one of said oil chambers during the discharge stroke thereof and with the other chamber during the suction stroke thereof, while each cylinder bore of said motor cylinder is brought into communication with one of said oil chambers during the expansion stroke thereof and with the other chamber during the contraction stroke thereof.
Claim 3
Dependent Claim
41 words
A static hydraulic continuously variable transmission according to claim 1, wherein the discharge port of a supplement pump is connected to said other oil chamber through a check valve for blocking the issuing of working oil out of said other chamber.
Claim 4
Dependent Claim
63 words
A static hydraulic continuously variable transmission according to claim 1 or 2, wherein said output shaft is fitted in said cylinder block at the central portion thereof, and a sleeve is fitted over the outer peripheral surface of said cylinder block, and wherein said pair of oil chambers are defined between the respective opposed surfaces of said cylinder block, output shaft and sleeve.
Claim 5
Dependent Claim
68 words
A static hydraulic continuously variable transmission according to any of claims 1 to 3, wherein one of said first and second dispensing valves comprises an operating portion engaging the corresponding first or second eccentric ring and a valve portion provided independently of said operating portion and slidably fitted in the valve bore made in said cylinder block, said valve portion and operating portion slidably abuting against each other.
Claim 6
Dependent Claim
30 words
A static hydraulic continuously variable transmission according to any preceding claim, wherein a follower ring is engaged with the inner ends of each of said first and second dispensing valves.
Claim 7
Dependent Claim
25 words
A static hydraulic continuously variable transmission according to claim 5, wherein said follower ring is disposed concentrically to the corresponding first or second eccentric ring.
Claim 8
Dependent Claim
63 words
A static hydraulic continuously variable transmission according to claim 1, wherein a plurality of clutch valves are radially arranged between said first and second dispensing valves, and a clutch control ring is engaged with the outer ends of the clutch valves, and wherein means are mounted between said first and second eccentric rings and said clutch control ring for preventing the mutual interference.
Claim 9
Dependent Claim
81 words
A static hydraulic continuously variable transmission according to claim 5 or 6, wherein a plurality of clutch valves are radially arranged between said first and second dispensing valves, a clutch control ring is engaged with the outer ends of said clutch valves and a follower ring being engaged with the inner ends of said clutch valves, and means are mounted between the respective follower rings of said first and second dispensing valves and said clutch valves for preventing the mutual interference.
Claim 10
Dependent Claim
80 words
A static hydraulic continuously variable transmission according to claim 3, wherein a plurality of clutch valves are radially arranged between said first and second dispensing valves, and that portion of said sleeve which is penetrated by said clutch valves is in the form of reinforcing rib, and further, a pair of reinforcing means are secured to the outer peripheral surface of said sleeve in such a manner as to clamp said first and second eccentric rings therebetween from the outside.
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