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US4049101A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for preventing faulty operation in transmission of motorcars

Assignee: Honda Motor Co Ltd
•
Filing: 1976-04-05
•
Granted: 1977-09-20
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Expires: 1996-04-05
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Abstract

Abstract Apparatus for preventing faulty operation in automatic transmissions of motorcars, the transmission having a speed-change sensor and a shift valve therein, for controlling the operation of the latter, the apparatus comprising oil-pressure operated high-speed and low-speed clutches interposed in respective high-speed and low-speed systems of the transmission, the system being selectively connectable through the shift valve to a main line pressure circuit connected to an oil-pressure source, wherein the shift valve is operable by the oil pressure and has at one end an oil-pressure chamber connectable to the main circuit through a pilot valve that can be opened by operation of the sensor. The oil-pressure chamber is connected to the low-speed clutch through a by-pass, and a flow passage is connected between the chamber and the main circuit, provided with a restrictor therein, while the low-speed clutch is provided with a leak valve that is opened for discharging the oil pressure when the low-speed clutch is operated at a speed higher than a predetermined value. Preferably the apparatus comprises a manually operable valve for appropriate selective operation in one of a plurality of operational modes of the transmission. One or more check valves may be associated with the manually operable valve.

Inventors

  • 👤 Torao Hattori
  • 👤 Masakazu Maezono

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 15:36
CPC Classifications
F; F16; F16D; F16D48/00; F16D48/02; F16D48/0206; F16D2048/0257; F16D2048/0281; F16D2500/00; F16D2500/10; F16D2500/108; F16D2500/1081; F16D2500/1085; F16D2500/30; F16D2500/306; F16D2500/3062; F16D2500/308; F16D2500/30806; F16D2500/314; F16D2500/3146; F16D2500/31466; F16D2500/50; F16D2500/508; F16D2500/50858; F16D2500/51; F16D2500/5104; F16D2500/70; F16D2500/704; F16D2500/70402; F16D2500/70406; F16D2500/7041; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19433

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 182 words
An apparatus for preventing faulty operation in automatic transmission of motor cars, said transmission having a speed-change sensor and a shift valve therein, for controlling the operation of the latter, the apparatus comprising an oil-pressure operated high-speed clutch interposed in a high-speed system, and an oil-pressure operated low-speed clutch interposed in a low-speed system of said transmission, and means for interchangeably connecting said systems through said shift valve to a main line circuit that is connected to an oil-pressure source, wherein said shift valve is operable by the oil pressure, and has at one end an oil-pressure chamber connectable to said main circuit through a pilot valve that can be opened by operation of said sensor, and wherein said chamber is connected to said low-speed clutch through a by-pass, and a flow passage that connects said chamber to said main circuit has a restrictor interposed therein, while said low-speed clutch is provided with a leak valve that is opened when said low-speed clutch is operated at a speed higher than a predetermined value, for discharging the oil pressure from said low-speed clutch.
Claim 2
Independent Claim 182 words
An apparatus for preventing faulty operation in automatic transmission of motor cars, said transmission having a speed-change sensor and a shift valve therein, for controlling the operation of the latter, the apparatus comprising an oil-pressure operated high-speed clutch interposed in a high-speed system, and an oil-pressure operated low-speed clutch interposed in a low-speed system of said transmission, and means for interchangeably connecting said systems through said shift valve to a main line circuit that is connected to an oil-pressure source, wherein said shift valve is operable by the oil pressure, and has at one end an oil-pressure chamber connectable to said main circuit through a pilot valve that can be opened by operation of said sensor, and wherein said chamber is connected to said low-speed clutch through a by-pass, and a flow passage that connects said chamber to said main circuit has a restrictor interposed therein, while said low-speed clutch is provided with a leak valve that is opened when said low-speed clutch is operated at a speed higher than a predetermined value, for discharging the oil pressure from said low-speed clutch.
Claim 3
Dependent Claim 54 words
The apparatus as defined in claim 1, further comprising a manually operable valve interposed between said main line pressure circuit and said oil-pressure source, for selectively operating said oil-pressure control shift valve in one of a plurality of operational modes of said transmission, such as the usual "neutral," "reverse," "park," "drive" and "low" modes.
Claim 4
Dependent Claim 86 words
The apparatus as defined in claim 2, further comprising a subsidiary line pressure circuit ordinarily connected to said low-speed clutch, on one side of said main line pressure circuit, but selectively connectable instead to said oil-pressure source when said manually operable valve is located in a selected one of its operational positions, further comprising a first check valve interposed in said by-pass, and a second check valve interposed in said subsidiary circuit, the latter being closed when the pressure in said oil-pressure chamber is unduly increased.

References Cited (Backward Citations)

US2929478A Cited
US3808738A Cited
US3823621A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-09-19 1981-03-21 1981-09-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-09-19 1985-03-21 1985-09-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-09-19 1989-03-21 1989-09-20 $7700.00 Window Closed / Lapsed

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