Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1989-09-14
1991-09-24
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74878, B60K 4108
Patent
active
050504568
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to an automatic speed changing apparatus for a vehicle wherein speed changing in connection with movement of the vehicle is automatically controlled and more particularly to improvement of an automatic speed changing apparatus preferably employable for a transmission mounted on a tire type construction machine such as a wheel loader or the like vehicle.
BACKGROUND ART
FIG. 1 schematically illustrates a technical concept representing a conventional automatic speed changing apparatus which has been employed for a passenger car, a truck or the like vehicle.
As shown in FIG. 1, the automatic speed changing apparatus is usually constructed such that the content of actuations of a select lever device 10 and an acceleration pedal 20 is inputted into a controller 30 comprising computers 31 and 32, and a rotational speed of an engine 40, a manner of turning on or off a clutch 50 and a manner of shifting gears in a transmission 60 are controlled to match the content of actuations of the select lever device 10 and the acceleration pedal 20.
Here, the select lever device 10 is such that a select lever signal representative of the content corresponding to the actuation position is outputted in response to shifting actuation of a select lever 11 in the direction of an arrow mark Fl in the drawing. For example, when the select lever 11 is actuated to a "R (reverse)" position, a select lever signal representative of "rearward movement of a vehicle movement of the vehicle in the rearward direction)" is outputted, when it is actuated to a "N (neutral)" position, a select lever signal representative of "parking and initiating of engine start" is outputted and when it is actuated to a "D (drive)" position, a select lever signal signal representative of "forward movement" is outputted from the select lever device 10. Particularly, when the select lever 11 is located at the position "D" representing "forward movement", the engine 40 (precisely speaking, an electronic governor 41 incorporated in the engine 40) and the transmission 60 (precisely speaking, a solenoid valve 61 usable for the purpose of shifting gears) are controlled via the controller 30 so that automatic speed changing is effected within the range of, e.g., second speed to fifth speed.
When the select lever 11 is actuated to a position representing "HOLD", a select lever signal representing "maintaining the gear position in the transmission 60 at this time point" is outputted from the select lever device 10. In this case, the gear position which has been selected via the solenoid valve 61 at this time point is maintained in the transmission 60. Namely, the vehicle is then caused to move while a constant speed stage which has been selected is maintained.
In addition, when the select lever 11 is actuated to the position "HOLD", actuation of the select lever 11 in the direction of an arrow mark F2 in the drawing makes it possible to perform a manual speed changing operation. If the select lever 11 is actuated in the direction of, e.g., "DOWN", a select lever signal representing "manual shift down" is outputted from the select lever device 10, whereby the transmission 60 is brought in meshing engagement with speed reduction gears. If the select lever 11 is actuated in the direction of "UP", a select lever signal representing "manual shift up" is outputted from the select lever device 10, whereby the transmission 60 is brought in meshing engagement with speed increase gears.
In connection with the select lever device 10, reference numeral 13 designates an inching switch for commanding movement of the vehicle at a very low speed by a depressing operation without actuation of an acceleration pedal, reference numeral 14 is an "ECON (economy)" switch for commanding so-called economic movement of the vehicle by a depressing operation, reference numeral 15 does a "PWR (power)" switch for commanding so-called powerful movement of the vehicle (movement of the vehicle with high output) by a depressing operation and ref
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Herrmann Allan D.
Kabushiki Kaisha Komatsu Seisakusho
Massey Ryan W.
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