EP0206550A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Static hydraulic pressure type continuously variable transmission
Assignee: Honda Motor Co Ltd
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Filing: 1986-05-28
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Granted: —
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Expires: 2006-05-28
Abstract
Abstract A static hydraulic pressure type continuously variable transmission (T) having a hydraulic closed circuit formed between a swashplate type hydraulic pump (P) and a swashplate type hydraulic motor (M), in which a high pressure oil passage (40) is communicated through exhaust valves (42) with a number of cylinder bores (8) annularly disposed in a pump cylinder (7) of the hydraulic pump (P), a low pressure oil passage (41) is communicated through intake valves (43) with the cylinder bores (8), and a number of distribution valves (44) capable of being reciprocated are radially disposed so as to provide an alternate communication between a number of cylinder bores (18) annularly disposed in a motor cylinder (17) of the hydraulic motor (M) and the high and low pressure oil passages. An eccentric ring (47) for imparting reciprocation to each distribution valve (44) is provided and a discharge side of a replenishing pump is communicated with an inner end surface of each distribution valve (44) to hydraulically urge the distribution valve in a direction of engagement with the eccentric ring (47).
Inventors
- 👤 Tsutomu Hayashi
- 👤 Yoshihiro Yoshida
- 👤 Mitsuru Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:36
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/122; F04B1/124; F04B1/14; F04B1/141; F04B1/146; F16; F16H; F16H39/00; F16H39/04; F16H39/06; F16H39/08; F16H39/10; F16H39/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
272 words
A static hydraulic pressure type continuously variable transmission having a hydraulic closed circuit formed between a swashplate type hydraulic pump and a swashplate type hydraulic motor, wherein a pump cylinder of said hydraulic pump and a motor cylinder of said hydraulic motor are integrally coupled to an output shaft, a number of cylinder bores are arranged annularly in said pump cylinder, a number of cylinder bores are also arranged annularly in said motor cylinder, an annular high pressure oil passage and an annular low pressure oil passage are disposed concentrically with each other between the pump cylinder bores and the motor cylinder bores, the high pressure oil passage communicating with all the pump cylinder bores via exhaust valves, the low pressure oil passage communicating with all the pump cylinder bores via intake valves, wherein a number of distribution valves are disposed in a radial arrangement so as to conduct reciprocating movements between a radially outward position and a radially inward position for placing said number of motor cylinder bores into alternate connection with said high pressure oil passage and said low pressure oil passage, respectively, an eccentric ring is disposed to surround from outside the distribution valves and engage with outer ends thereof so as to impart reciprocating motion to respective distribution valves in response to rotation of said pump cylinder and motor cylinder, and wherein a replenishing pump for replenishing working fluid to said low pressure oil passage is provided to have a discharge side thereof connected to inner end surfaces of the distribution valves so as to hydraulically bias the distribution valves in an engaging direction with the eccentric ring.
Claim 2
Dependent Claim
272 words
A static hydraulic pressure type continuously variable transmission having a hydraulic closed circuit formed between a swashplate type hydraulic pump and a swashplate type hydraulic motor, wherein a pump cylinder of said hydraulic pump and a motor cylinder of said hydraulic motor are integrally coupled to an output shaft, a number of cylinder bores are arranged annularly in said pump cylinder, a number of cylinder bores are also arranged annularly in said motor cylinder, an annular high pressure oil passage and an annular low pressure oil passage are disposed concentrically with each other between the pump cylinder bores and the motor cylinder bores, the high pressure oil passage communicating with all the pump cylinder bores via exhaust valves, the low pressure oil passage communicating with all the pump cylinder bores via intake valves, wherein a number of distribution valves are disposed in a radial arrangement so as to conduct reciprocating movements between a radially outward position and a radially inward position for placing said number of motor cylinder bores into alternate connection with said high pressure oil passage and said low pressure oil passage, respectively, an eccentric ring is disposed to surround from outside the distribution valves and engage with outer ends thereof so as to impart reciprocating motion to respective distribution valves in response to rotation of said pump cylinder and motor cylinder, and wherein a replenishing pump for replenishing working fluid to said low pressure oil passage is provided to have a discharge side thereof connected to inner end surfaces of the distribution valves so as to hydraulically bias the distribution valves in an engaging direction with the eccentric ring.
Claim 3
Dependent Claim
107 words
The transmission according to Claim 1 wherein a valve hole is provided, said valve hole extending radially between and over said low pressure oil passage and said high pressure oil passage, a clutch valve is slidably fitted in said valve hole, said clutch valve capable of being moved between a clutch ON position to cut off between said low and high pressure oil passages and a clutch OFF position to communicate between both the oil passages, wherein an amount of communication between said low and high pressure oil passages is gradually increased as said clutch valve moves from said clutch ON position toward said clutch OFF position.
Claim 4
Dependent Claim
65 words
The transmission according to Claim 2 wherein a clutch control member capable of forcibly moving said clutch valve to one of said clutch ON position and said clutch OFF position is engaged with one end of said clutch valve, and said low pressure oil passage is communicated with the other end of said clutch valve to hydraulically urge said clutch valve toward the other position.
Claim 5
Dependent Claim
67 words
The transmission according to Claim 3 wherein said low pressure oil passage is located radially internally of said high pressure oil passage whereby oil pressure of said low pressure oil passage exerts on the radial inner end surface of said clutch valve and an outer end of the clutch valve is forcibly pushed by said clutch control member arranged on an outer periphery of said pump cylinder.
Claim 6
Dependent Claim
90 words
5 . The transmission according to any preceding Claim Wherein a first valve board on which said intake valves and said exhaust valves are provided and a second valve board on which said low and high pressure oil passages and said distribution valves are provided are disposed between said pump cylinder and said motor cylinder, said pump cylinder, motor cylinder, first valve board and second valve board being connected to said output shaft which extends through center portions of these members and being located and fastened, relative to one another.
Claim 7
Dependent Claim
28 words
The transmission according to Claim 5 wherein said second valve board further includes a clutch valve provided to control communication between said low and high pressure oil passages.
Claim 8
Dependent Claim
58 words
The transmission according to any preceding Claim wherein each of said distribution valves is slidably fitted in a valve hole, an oil passage joined to said replenishing pump is provided in said output shaft, and said low pressure oil passage is communicated with the oil passage in said output shaft through the valve hole of said distribution valve.
Claim 9
Dependent Claim
21 words
8 . The transmission according to any preceding Claim wherein said swashplate type hydraulic pump is of a constant capacity type.
Claim 10
Dependent Claim
24 words
9 . The transmission according to any of Claims 1 to 7 wherein said swashplate type hydraulic motor is of a variable capacity type.
References Cited (Backward Citations)
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