Thermal measuring and testing – Temperature measurement – Combined with diverse art device
Reexamination Certificate
2001-09-13
2003-12-16
Gutierrez, Diego (Department: 2859)
Thermal measuring and testing
Temperature measurement
Combined with diverse art device
C374S142000, C374S148000
Reexamination Certificate
active
06663279
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a device for measuring the temperature of a transmission oil.
BACKGROUND OF THE INVENTION
In a vehicle transmission, for different reasons, it is required to measure the temperature of the lubricant used in the transmission and to supply different control devices. The temperature becomes necessary especially for diagnosis problems and for calculation of maintenance intervals. When a preset temperature threshold is exceeded, a warning is issued to the user of the vehicle.
Former systems have a measurement element directly mounted in the oil sump of the transmission. For example, a separate electronic system is needed for the evaluation of the signal. Further required is a not inconsiderable disbursement in cabling which is costly and exerts negative influences upon the reliability.
The problem on which the invention is based is to indicate a device for measuring the transmission oil temperature which offers an increased reliability at low cost.
The problem is solved by a device having the features of claim
1
or x (sic). Developments are object of sub-claims.
SUMMARY OF THE INVENTION
The invention proposes a device for measuring the temperature of the oil in a housing of a transmission having a temperature sensor which can come into contact with the oil in the transmission. The temperature sensor is here placed outside the oil sump in the transmission housing. In an advantageous development, the temperature sensor comes into contact with the oil during operation of the transmission by wetting with oil spray. To that end, in an advantageous development, the oil spray is whirled up by rotating elements in the transmission, the rotating elements being gear wheels of the transmission. In one other advantageous development, the temperature sensor is situated in the immediate proximity of a speed sensor with rotary meter disk so that the spray oil is sprayed on the temperature sensor by the meter disk.
Another advantageous development shows a temperature sensor which, during operation of the transmission, comes into contact with the oil via a lubricant circuit. In an advantageous development, the temperature sensor can be disposed in the pressure area of the lubricant circuit directly in parts of the transmission which contains the electronics and the shift actuation system.
One other advantageous development shows the temperature sensor integrated in another sensor, especially in a speed sensor.
In another advantageous development of the invention, the signals of a sensor of the transmission, which does not primarily serve for temperature detection, can be evaluated in an electronic control system for detection of the temperature. In an advantageous development of this, the inner resistance of a speed sensor can be detected and the change of temperature of the transmission oil can be evaluated in an electronic control system by the change of the inner resistance.
REFERENCES:
patent: 1454149 (1923-05-01), Boyce
patent: 1781512 (1930-11-01), Holt
patent: 2579363 (1951-12-01), Cataldo
patent: 4622851 (1986-11-01), Wilson
patent: 4702341 (1987-10-01), Taga et al.
patent: 4855913 (1989-08-01), Brekkestran et al.
patent: 5003842 (1991-04-01), Hatta et al.
patent: 5050451 (1991-09-01), Hussain
patent: 5076708 (1991-12-01), Pierson
patent: 5282386 (1994-02-01), Niemczyk et al.
patent: 5315825 (1994-05-01), Giberson
patent: 5421791 (1995-06-01), Futuwatari
patent: 5449329 (1995-09-01), Brandon et al.
patent: 5467854 (1995-11-01), Creger et al.
patent: 5611372 (1997-03-01), Bauer et al.
patent: 5658213 (1997-08-01), Sato et al.
patent: 5716134 (1998-02-01), Wagner et al.
patent: 5730094 (1998-03-01), Morris
patent: 5747680 (1998-05-01), McArthur
patent: 5845544 (1998-12-01), Huggins et al.
patent: 5941137 (1999-08-01), Beer et al.
patent: 5947856 (1999-09-01), Tabata et al.
patent: 6022139 (2000-02-01), Kil
patent: 6106151 (2000-08-01), Johannesson
patent: 6189396 (2001-02-01), Barnreiter et al.
patent: 6199663 (2001-03-01), Roy et al.
patent: 6216528 (2001-04-01), Carrell et al.
patent: 6393943 (2002-05-01), Sommer et al.
patent: 6405611 (2002-06-01), DeJonge et al.
patent: 6488601 (2002-12-01), Sommer et al.
patent: 6530856 (2003-03-01), Kakiage
patent: 2001/0004620 (2001-06-01), Onuki
patent: 2002/0032093 (2002-03-01), Kopec et al.
patent: 31 08 242 (1982-11-01), None
patent: 44 31 045 (1996-03-01), None
patent: 296 11 668 (1996-10-01), None
patent: 0278554 (1988-08-01), None
patent: 0 479 464 (1997-01-01), None
patent: 08288498 (1996-11-01), None
patent: 1474293 (1989-04-01), None
Albrecht Harald
Heinzelmann Karl-Fritz
Davis & Bujold PLLC
Gutierrez Diego
Jagan Mirellys
ZF Friedrichshafen AG
LandOfFree
Device for measuring the gearbox oil temperature does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for measuring the gearbox oil temperature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for measuring the gearbox oil temperature will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3100693