DOUBLE-CLUTCH TRANSMISSION

• US 20080236317A1
• Filed: 03/25/2008
• Published: 10/02/2008
• Est. Priority Date: 03/26/2007
• Status: Active Grant

• Current Assignee: Mitsubishi Jidosha Engineering Kabushiki Kaisha, Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Original Assignee: Mitsubishi Jidosha Engineering Kabushiki Kaisha, Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Inventors: Kimura, Takao, Komori, Katsuhiro, MATSUSHITA, Masahiro
• Granted Patent: US 8,042,418 B2
• Time in Patent Office: Days
• US Class Current: 74/340
• CPC Class Codes: F16H 2003/0931 each countershaft having an output gear meshing with a single common gear on the output shaft
• CPC Class Codes: F16H 2061/122 Avoiding failures by using redundant parts
• CPC Class Codes: F16H 2061/1284 the failing part is a sensor
• CPC Class Codes: F16H 2200/0052 the gear ratios comprising six forward speeds
• CPC Class Codes: F16H 2306/48 Synchronising of new gear
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 59/42 Input shaft speed
• CPC Class Codes: F16H 61/12 Detecting malfunction or potential malfunction, e.g. fail safe in control of hydrostatic gearing F16H61/4192; Circumventing or fixing failures
• CPC Class Codes: F16H 61/688 with two inputs, e.g. selection of one of two torque-flow paths by clutches
• CPC Class Codes: Y10T 74/19228 Multiple concentric clutch shafts
• CPC Class Codes: Y10T 74/19242 Combined gear and clutch
• CPC Class Codes: Y10T 74/1926 Speed responsive
• CPC Class Codes: Y10T 74/19288 Double clutch and interposed transmission

Abstract

In a double-clutch transmission, a clutch of an input shaft which is not synchronously rotated with a output shaft is connected to synchronize the speed of rotation of the input shaft with that of the engine, and the rotational speed of the input shaft is measured to thereby detect a engine rotational speed.

Claims

1. A double-clutch transmission, comprising:

an input system provided with drive gears of a first gearshift level group of a plurality of gearshift levels divided into two groups, a first input shaft to which the drive gears of the first gearshift level group are installed, drive gears of a second gearshift level group, a second input shaft to which the drive gears of the second gearshift level group are installed, a first clutch which conveys the rotational force of an engine to the first input shaft, and a second clutch which conveys the rotational force of the engine to the second input shaft;

an output system provided with driven gears of a first gearshift level group engaged with the drive gears of the first gearshift level group, driven gears of the second gearshift level group engaged with the drive gears of the second gearshift level group, an output shaft to which the driven gears of the first gearshift level group and the driven gears of the second gearshift level group are rotatably supported, a first synchromesh mechanism which is installed to the output shaft, engages with the driven gears of the first gearshift level group, and achieves synchronous rotation between the first input shaft and the output shaft, and a second synchromesh mechanism which is installed to the output shaft, engages with the driven gears of the second gearshift level group, and achieves synchronous rotation between the second input shaft and the output shaft;

a first detection unit which measures a rotational speed of the first input shaft; and

a second detection unit which measures a rotational speed of the second input shaft,

wherein a clutch of the input shaft which is not synchronously rotated with the output shaft is connected to synchronize the speed of rotation of the input shaft with that of the engine, and the rotational speed of the input shaft is measured to thereby detect the engine rotational speed.

2. The double-clutch transmission according to claim 1, further comprising:

an engine sensor which is installed to the engine and measures the engine rotational speed; and

control unit for controlling the first clutch based on the engine rotational speed measured by the engine sensor and the rotational speed of the first input shaft and controlling the second clutch based on the engine rotational speed and the rotational speed of the second input shaft,

wherein when the engine sensor fails, the clutch of the input shaft which is rotated synchronously with the output shaft is controlled by use of the engine rotational speed detected by the rotational speed of the input shaft which is not rotated synchronously with the output shaft.

3. The double-clutch transmission according to claim 2, further comprising:

a driven gear for reverse which rotates synchronously with the drive gear of the first gearshift level group and at the same time rotates the output shaft in the reverse direction,

wherein when the engine sensor fails, the engine rotational speed is detected by the rotational speed of the second input shaft to thereby enable control of the first clutch.