EP0025823A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Manual transmission and hydraulically operated subtransmission
Assignee: Toyota Motor Corp
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Filing: 1980-07-07
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Granted: —
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Expires: 2000-07-07
Abstract
Abstract A transmission for an automotive vehicle, including an auxiliary speed change device of a planetary gear mechanism type, which provides two speed stages and is automatically shifted between the two speed stages by a hydraulic fluid control system according to the operational conditions of the vehicle, and a main speed change device which is connected in series to the auxiliary speed change device, and which includes a gear transmission mechanism, which is manually shiftable between several speed stages.
Inventors
- 👤 Akio Numazawa
- 👤 Hajime Arai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 13:50
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/04; F16H37/042; F16H37/046; F16H3/00; F16H3/02; F16H3/08; F16H3/087; F16H3/091; F16H3/0915; F16H3/44; F16H3/46; F16H3/48; F16H3/52; F16H3/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
A transmission for an automotive vehicle, comprising: (a) a transmission casing; (b) a power input shaft; (c) an auxiliary speed change device, comprising; (cl) a planetary gear mechanism, comprising a sun gear, a ring gear drivingly coupled to the power input shaft, a plurality of planetary pinions meshed between the sun gear and the ring gear, and a carrier rotatably supporting the planetary pinions; (c2) a friction engaging element coupled to the sun gear, which is selectively drivable between a first position wherein it connects the sun gear to the ring gear, and a second position where it connects the sun gear to the transmission casing; and (c3) a hydraulic actuator, supply of hydraulic fluid pressure to which selectively propels said friction engaging element between said first and second positions; and (d) a main speed change device, comprising: (dl) a power input member which receives input of rotary power from said planetary carrier; (d2) a power output shaft; and (d3) a gear transmission mechanism which provides a plurality of reduction gear ratios between said power input member and said power output shaft, according to manual shift operation.
Claim 2
Dependent Claim
187 words
A transmission for an automotive vehicle, comprising: (a) a transmission casing; (b) a power input shaft; (c) an auxiliary speed change device, comprising; (cl) a planetary gear mechanism, comprising a sun gear, a ring gear drivingly coupled to the power input shaft, a plurality of planetary pinions meshed between the sun gear and the ring gear, and a carrier rotatably supporting the planetary pinions; (c2) a friction engaging element coupled to the sun gear, which is selectively drivable between a first position wherein it connects the sun gear to the ring gear, and a second position where it connects the sun gear to the transmission casing; and (c3) a hydraulic actuator, supply of hydraulic fluid pressure to which selectively propels said friction engaging element between said first and second positions; and (d) a main speed change device, comprising: (dl) a power input member which receives input of rotary power from said planetary carrier; (d2) a power output shaft; and (d3) a gear transmission mechanism which provides a plurality of reduction gear ratios between said power input member and said power output shaft, according to manual shift operation.
Claim 3
Dependent Claim
90 words
A transmission according to claim 1, wherein the friction engaging element comprises a hollow conical assembly having outer and inner conical friction engaging surfaces, wherein the transmission casing is formed with an inner conical friction engaging surface which engages with said outer friction engaging surface when the friction engaging element is positioned in its second position, and wherein further the ring gear is formed with an outer conical friction engaging surface which engages with said inner friction engaging surface when the friction engaging element is positioned in its first position.
Claim 4
Dependent Claim
28 words
A transmission according to claim 2, wherein the friction engaging element and the hydraulic actuator are located between the planetary gear mechanism and the main speed change device.
Claim 5
Dependent Claim
41 words
A transmission according to claim 3, wherein the hydraulic actuator comprises an annular chamber and an annular piston fitted in the chamber, the auxiliary and the main speed change devices being drivingly coupled through the central opening of said annular chamber.
Claim 6
Dependent Claim
125 words
A transmission according to claim 4, wherein the hydraulic actuator further comprises an annular spring plate and a thrust bearing having outer and inner race members, the outer peripheral portion of said annular spring plate being connected to the transmission casing while the inner peripheral portion of said annular spring plate is connected to the outer race of said thrust bearing, wherein the inner race of said thrust bearing is connected to said friction engaging element, said annular spring plate exerting a force on said outer race so as to drive the friction engaging element towards said second position, and wherein said annular piston drives the inner peripheral portion of said annular spring plate against said spring force, when it is actuated by hydraulic pressure.
Claim 7
Dependent Claim
55 words
A transmission according to any preceding claim, wherein, when said friction engaging element is in its second position, and also said main speed change device is providing its highest speed gear stage, the rotational speed of said power output shaft is greater than or equal to the corresponding rotational speed of said power input shaft.
References Cited (Backward Citations)
No citation records indexed.
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