Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Reexamination Certificate
2000-12-29
2002-08-27
Bonck, Rodney H (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
C475S130000
Reexamination Certificate
active
06440028
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a manual valve of a hydraulic pressure control system for an automatic transmission, and in particular, to an improved manual valve capable of independently controlling all friction elements of the automatic transmission using an indirect control mechanism in which second stage control pressure is provided to the friction elements and a line pressure control solenoid valve.
(b) Description of the Related Art
Generally, a conventional automatic transmission for a vehicle includes a multi-stage gear shift mechanism connected to a torque converter, and a plurality of friction elements actuated by hydraulic pressure under control of a hydraulic pressure control system for selecting a gear stage of the gear shift mechanism.
In such automatic transmissions, the hydraulic pressure control system includes a pressure control means for controlling a level of hydraulic pressure generated by a hydraulic pump, manual and automatic shift control means for performing shift operation, hydraulic pressure control means for adjusting responsibility and shift quality by smoothing shift operation, distribution means for distributing the pressure from the hydraulic pressure control means to appropriate friction elements, and damper clutch control means for controlling operation of a damper clutch of a torque converter.
The gear shift control is achieved by the friction elements being selectively and differently applied by hydraulic pressure from the distribution means and cooperation of on/off and duty control solenoid valves, such that a constitution and control method of a hydraulic control system depends on particular power trains adapted by car makers and how the power trains are controlled.
The manual valve performs pressure line conversion by driver's manipulation, and
FIG. 4
shows a conventional manual valve adapted to the automatic transmission manufactured by the applicant of the present invention.
As shown In
FIG. 4
, a valve body is provided with a first port
200
for receiving hydraulic pressure from a hydraulic pump (not shown), a second port
202
for supplying the hydraulic pressure to a shift control valve (not shown) at ranges “D”, “2”, and “L”, a third port
204
for supplying the hydraulic pressure to a pressure regulator valve (not shown) at ranges “N”, “D”, “2”, and “L”, and a fourth port
206
for supplying hydraulic pressure to the regulator valve and an N-R control valve (not shown) at range “R”.
A valve spool
210
inserted into the valve body is provided with a connect part
212
formed at one end portion of the valve spool
210
, a first land
214
positioned between the second and third ports at range “P ” and positioned at the right side of the third port at other ranges, a second land
216
for communicating the third port
204
or the second and third ports
202
and
204
with the first port
200
at all ranges except for the ranges “P” and “R”, and a third land
218
for communicating the first port
200
and the fourth port
206
at the range “R”.
Also, the valve spool
210
is provided with a release opening
222
formed between the first and the second lands
214
and
216
and vertically passing through an axis of the valve spool
210
, and a release hole
220
formed from the right end of the valve spool
210
to the release opening
222
.
In this structure, the hydraulic pressure from the first port
200
is supplied to the third port
204
at range “N”, to the second and third ports
202
and
204
at range “D”, and to the fourth port
206
at range “R”, and the hydraulic pressure from the first port
200
is released via the release opening
222
and the release hole
220
at range “P”.
However, in this conventional manual valve, since the hydraulic pressure fed from the hydraulic pump is released at range “P”, the regulator valve ceases control such that the torque converter can receive only a small amount of hydraulic pressure through an orifice.
Accordingly, the lack of hydraulic pressure causes the friction elements to be damaged and delays hydraulic pressure supply to the friction elements particularly under sudden acceleration, resulting in. degraded sudden acceleration performance of the vehicle. Also, it is impossible to precisely measure the oil amount at range “P.”
Furthermore, this kind of manual valve can only be used in an automatic transmission because the pressure line conversions are performed at ranges of “N”, “D”, and “R.”
SUMMARY OF THE INVENTION
The present invention has been made in an effort to solve the above problems.
It is an object of the present invention to provide a manual valve of a hydraulic pressure control system capable of hydraulic control even at the range “P”, and preventing the friction elements from being damaged and avoiding sudden acceleration performance degradation because of the lack of oil.
It is another object of the present invention to provide a manual valve of the hydraulic pressure control system in which ranges can easily be modified from the 6 ranges of “P”, “R”, “N”, “D”, “2”, and “L” to the 7 ranges of “P”, “R”, “N”, “D”, “3”, “2”, and “L”.
To achieve the above object, a manual valve of a hydraulic pressure control system for an automatic transmission of the present invention comprises a valve body and a valve spool slidably inserted into the valve body, wherein the valve body is provided with a first port communicated with a regulator valve via a pressure line, a second port connected to a first pressure control valve and a second fail safe valve so as to supply hydraulic pressure thereto at range “P”, a third port connected to the regulator valve, an N-R control valve, and a first and a second switch valve so as to supply the hydraulic pressure from the first port thereto at range “R”, a fourth port connected to a second and a third pressure control valve and the first and second switch valves so as to supply the hydraulic pressure from the first valve thereto at ranges “2”, “3”, and “D”, and a fifth port connected to the first switch valve so as to supply the hydraulic pressure from the first port thereto at range “L”.
REFERENCES:
patent: 4602529 (1986-07-01), Sugano
patent: 5010786 (1991-04-01), Hiramatsu et al.
patent: 5634865 (1997-06-01), Jang
patent: 5643123 (1997-07-01), Jang et al.
patent: 5658220 (1997-08-01), Jang
patent: 6206802 (2001-03-01), Kim
Jang Jae-Duk
Kim Tae-Kyun
Lee Chang-Wook
Lee Jin-Hee
Park Jong-Sool
Bonck Rodney H
Hyundai Motor Company
Le David D.
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