192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1995-03-10
1996-12-31
Lorence, Richard M.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192109F, B60K 4126
Patent
active
055885152
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of and apparatus for speed change control implemented by changing the rotational speed of a prime mover, such as an engine, and transmitting it to an output shaft, and, more particularly, to a method of and apparatus for speed change control which are ideally used for changing speed when switching between a vehicle forward gear and a reverse gear, especially in a gear shifting mechanism based on planetary gears, and which can be applied for changing the speed of or starting a vehicle.
BACKGROUND ART
Construction machines, such as bulldozers and wheel loaders, generally have gear shifting mechanisms based on planetary gears. Through the gear shifting mechanism based on the planetary gears, switching between forward and reverse travel and speed changes are accomplished.
FIG. 10 shows an example of a planetary-gear type transmission (hereinafter referred to as "transmission") 10 which is mounted on a construction machine. The transmission 10 has a forward/reverse gear selector 20 and a speed gear selector 50 housed in a case 11. The forward/reverse gear selector 20 has a reverse sun gear 22 and a forward sun gear 24 which are fixed on an input shaft 13 connected to a driving source 12, such as a torque converter. A ring gear 26 is disposed around the reverse sun gear 22; a reverse planetary gear 30, which is supported by a reverse carrier 28, is meshed with the ring gear 26 and the reverse sun gear 22. The carrier 28 can be engaged with or disengaged from the case 11 through the reverse clutch (R clutch) 32.
The ring gear 26 is connected to a forward planetary gear 34 meshed with the forward sun gear 24 and a carrier 36 which supports the planetary gear of the speed selector 50 to be discussed later. A forward ring gear 38 meshed with the planetary gear 34 can be engaged with or disengaged from the case 11 through a forward clutch (F clutch) 40.
The speed selector 50 has a sun gear 52 for first gear, a sun gear 54 for second gear, and a sun gear 56 for third gear, which are fixed on an output shaft 14. A planetary gear 58, meshed with the sun gear 54 for second gear, and a planetary gear 60 for third gear, meshed with the sun gear 56 for third gear, are supported by the carrier 36 which supports the forward planetary gear 34. Further, the planetary gear 58 for second gear and the planetary gear 60 for the third gear are meshed with a ring gear 62 for second gear and a ring gear 64 for third gear, respectively, which are disposed outside thereof. These ring gears 62 and 64 can be engaged with or disengaged from the case 11 through a second gear clutch 66 and a third gear clutch 68, respectively.
A carrier 70, connected to the ring gear 62 for second gear, supports a planetary gear 72 for first gear. The planetary gear 72 meshes with the sun gear 52 for first gear and also with a ring gear 76 for first gear, which is disposed around the sun gear 52 and which is engaged with or disengaged from the case 11 through a clutch 74 for first gear. A reference numeral 15 denotes the inertia of a vehicle.
The transmission 10 having the construction described above engages the clutch 32 or 40 of the forward/reverse gear selector 20 to select forward or reverse travel of a vehicle and obtains a required reduction ratio by engaging one of the clutches 66, 68, and 74 of the speed selector 50. For example, to set for the forward second gear, the transmission 10 causes the forward clutch 40 to engage with the second gear clutch 66, fixing the forward ring gear 38 and the ring gear 62 for second gear on the case 11, and releasing the other clutches.
The following gives more detailed description of the operating procedure for shifting from the reverse first gear into the forward second gear.
In the case of the reverse first gear, the reverse clutch 32 engages along with the clutch 74 for first gear, and the reverse carrier 28 and the ring gear 76 for first gear are fixed to the case 11, the other clutches being released. Therefore, in the first step, the revers
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Asai Yoshikazu
Toyama Makoto
Kabushiki Kaisha Komatsu Seisakusho
Lorence Richard M.
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