EP0061736A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Continuously variable V-belt transmission including hydrodynamic transmission unit with lock-up means
Assignee: Nissan Motor Co Ltd
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Filing: 1982-03-25
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Granted: —
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Expires: 2002-03-25
Abstract
Abstract A continuously variable V-belt transmission comprises a hydrodynamic transmission unit including a lock-up means. A switch valve is provided which is responsive to fluid pressure in a cylinder chamber of a drive pulley, which fluid pressure being indicative of the reduction ratio of a continuously variable V-belt transmission unit. The lock-up means is engaged in response to the state of the switch valve to lock the hydrodynamic transmission unit when the reduction ratio is small. The switch valve may be responsive to stator reaction of a stator of the hydrodynamic transmission unit so that the lock-up means is released as long as the hydrodynamic transmission unit multiply torque.
Inventors
- 👤 Sigeaki Yamamuro
- 👤 Hiroyuki Hirano
- 👤 Yoshio Morimoto
- 👤 Yoshikazu Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 00:02
CPC Classifications
F; F16; F16H; F16H45/00; F16H45/02; F16H47/00; F16H47/06; F16H47/065; F16H61/00; F16H61/66; F16H61/662; F16H61/66254; F16H61/66263; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/19153; Y10T74/19158; Y10T74/19163
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
212 words
A continuously variable V-belt transmission comprising: a continuously variable V-belt transmission unit having a drive shaft; a hydrodynamic transmission unit having an output drivingly connected to the drive shaft of the continuously variable V-belt transmission unit, the hydrodynamic transmission unit including a lock-up means operative when engaged to lock the hydrodynamic transmission unit in a lock-up mode; the continuously variable V-belt transmission unit having a V-belt running over a drive and a driven pulley, each having cylinder chamber and two conical discs, one conical disc, of the drive pulley being secured to the drive shaft, one conical disc of the driven pulley being secured to. a driven shaft, the other conical disc of the drive pulley being controllably movable in an axial direction of the drive shaft in response to the fluid pressure in the cylinder chamber thereof, the other conical disc of the driven pulley being controllably movable in an axial direction of the driven shaft in response to the fluid pressure in the cylinder chamber thereof; a switch valve means for shifting into one of a first state and a second state responsive to fluid pressure in the cylinder chamber of the drive pulley; control means responsive to the state of the switch valve means for actuating the lock-up means.
Claim 2
Dependent Claim
212 words
A continuously variable V-belt transmission comprising: a continuously variable V-belt transmission unit having a drive shaft; a hydrodynamic transmission unit having an output drivingly connected to the drive shaft of the continuously variable V-belt transmission unit, the hydrodynamic transmission unit including a lock-up means operative when engaged to lock the hydrodynamic transmission unit in a lock-up mode; the continuously variable V-belt transmission unit having a V-belt running over a drive and a driven pulley, each having cylinder chamber and two conical discs, one conical disc, of the drive pulley being secured to the drive shaft, one conical disc of the driven pulley being secured to. a driven shaft, the other conical disc of the drive pulley being controllably movable in an axial direction of the drive shaft in response to the fluid pressure in the cylinder chamber thereof, the other conical disc of the driven pulley being controllably movable in an axial direction of the driven shaft in response to the fluid pressure in the cylinder chamber thereof; a switch valve means for shifting into one of a first state and a second state responsive to fluid pressure in the cylinder chamber of the drive pulley; control means responsive to the state of the switch valve means for actuating the lock-up means.
Claim 3
Dependent Claim
87 words
A continuously variable V-belt transmission as claimed in claim 1, wherein said control means engages the lock-up means to lock the hydrodynamic transmission unit when the switch valve means assumes the first state thereof when the fluid pressure in the cylinder chamber of the drive pulley is higher than a predetermined value, and the control means releases the lock-up means when the switch valve assumes the second state thereof when the fluid pressure in the cylinder chamber of the drive pulley is lower than a predetermined value.
Claim 4
Dependent Claim
65 words
A continuously variable transmission as claimed in claim 1 or 2, including: pumping means for the fluid; pressure regulator valve means for regulating the fluid supplied by the pumping means; control valve means connected to the pressure regulator valve means to receive the fluid pressure therefrom for regulating fluid supply to and discharge from both of the cylinder chamber of the drive and driven pulleys.
Claim 5
Dependent Claim
53 words
A continuously variable V-belt transmission as claimed in any one of claims 1 through 3, wherein the fluid pressure in the cylinder chamber of the drive pulley such that the fluid pressure in the cylinder chamber of the drive pulley. increases as the reduction ratio of the continuously variable V-belt transmission unit decreases.
Claim 6
Dependent Claim
79 words
A continuously variable V-belt transmission as claimed in claim 4, including means for biasing the switch valve in a first direction tending to shift the switch valve into the second state thereof against the fluid pressure supplied to the switch valve from the cylinder chamber of the drive pulley, the fluid pressure supplied to the switch valve from the cylinder chamber of the drive pulley biasing the switch valve to shift the switch valve into the first state thereof.
Claim 7
Dependent Claim
25 words
A continuously variable V-belt transmission as claimed in claim 5, wherein the means for biasing the switch valve in the first direction includes a spring.
Claim 8
Dependent Claim
62 words
A continuously variable V-belt transmission as claimed in any one of claims 1 through 6, wherein the driven pulley is provided with a spring arranged so as to bias the other conical disc of the driven pulley in a direction assisting the movement of the other conical disc of the driven pulley responsive to the fluid pressure in the cylinder chamber thereof.
Claim 9
Dependent Claim
56 words
A continuously variable V-belt transmission as claimed in any one of claims 1 through 7, wherein the hydrodynamic transmission unit includes a stator, and further comprising: means responsive to stator reaction of the stator for biasing the switch valve against the fluid pressure supplied to the switch valve from the cylinder chamber of the drive pulley.
Claim 10
Dependent Claim
74 words
A continuously variable V-belt transmission as claimed in claim 8, wherein the means responsive to stator reaction comprises a reaction shaft carrying the stator via a one-way clutch, a lever connected to the reaction shaft for rotation therewith, and a pressure regulator valve means for impressing fluid pressure to the switch valve in a direction against fluid pressure supplied from the cylinder chamber of the drive pulley in response to rotation of the lever.
Claim 11
Dependent Claim
60 words
A continuously variable V-belt transmission as claimed in claim 8 or 9, wherein the means responsive to stator reaction comprises a reaction shaft carrying the stator via a one-way clutch and a lever connected to the reaction shaft and acting upon the switch valve to bias same against fluid pressure supplied thereto from the cylinder chamber of the drive pulley.
Claim 12
Dependent Claim
92 words
A continuously variable V-belt transmission as claimed in any one of claims 8 through 10, wherein the control means engages the lock-up means when a force by the fluid pressure supplied to the switch valve from the cylinder chamber of the drive pulley is greater than a force by the means responsive to stator reaction, and, the control means releases the lock-up means when the force by the fluid pressure supplied thereto from the cylinder chamber of the drive pulley is smaller than the force by the means responsive to stator reactor.
Claim 13
Dependent Claim
41 words
A continuously variable V-belt transmission as claimed in any one of claims 8 through 10, wherein the lock-up means is always released as long as the force by the means responsive to the stator reaction is acted on the switch valve.
References Cited (Backward Citations)
No citation records indexed.
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