Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1989-08-30
1991-01-22
Braun, Leslie A.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74477, 475209, F16H 6100, F16H 6300
Patent
active
049861425
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to machine building and, more specifically, it relates to a control mechanism of the compound transmission for a transport vehicle.
BACKGROUND OF THE INVENTION
A currently-existing problem consists in providing a reliable control mechanism for the compound transmission for a transport vehicle fitted with a main gearbox and a tandem-connected auxiliary two-range gearbox with high-gear and low-gear ranges.
Transmissions of this type are most characteristic of the motor trucks of medium and high load-carrying capacity. The tandem connection of the auxiliary two-range gearbox with the main gearbox doubles the total number of speeds in the transmission thus improving the running performance of the motor truck and its fuel consumption within a broad range of its service conditions.
However, the necessity of simultaneous control of two gearboxes, the main and auxiliary ones, complicates the control mechanisms of such compound transmissions, thereby impairing their reliability.
Known in the prior art is a control mechanism of the compound transmission for a transport vehicle (DE, C, 1195177) comprising a main gearbox and an auxiliary two-range gearbox connected in tandem to said main gearbox and having a high-gear range and a low-gear range.
The main gearbox providing for four forward speeds comprises constant-mesh gears mounted on parallel rotating shafts, and two gear couplings, one for alternate engagement of two forward speeds and the other one for alternate engagement of two additional forward speeds. The auxiliary two-range gearbox is a planetary mechanism and has a toothed coupling intended for alternate engagement of the low-gear (step-down) range and a high-gear (direct speed) range.
The control mechanism of this compound transmission comprises a casing, a hand lever articulated with said casing, a shaft installed in the casing, said shaft being linked kinematically with the hand lever and having pins engaging the drive links of the toothed couplings of the main gearbox, a pneumatic actuator for moving the toothed coupling of the auxiliary two-range gearbox, and a system of valves for controlling said pneumatic actuator.
The hand lever has a handle operated by the vehicle driver and is installed on the casing of the transmission control mechanism so that the lever can be shifted over a "double-H" path. On shifting the lever handle in a transverse direction, the lever turns the shaft so as to select the speeds in the main gearbox, while on longitudinal movement of the lever handle, said lever moves the same shaft axially in one direction or other so that the selected speed is mechanically engaged in the main gearbox.
On shifting the lever handle over one half of the "double-H" path, the speeds are successively engaged in the main gearbox at one range of the auxiliary two-range gearbox. When the lever handle is shifted transversely from one half of the "double-H" path to its other half, the valves control the pneumatic actuator intended to change ranges in the auxiliary two-range gearbox. As the lever handle is further moved over the second half of the "double-H" path, again the main gearbox speeds are successively engaged but now in the other range of the auxiliary two-range gearbox.
The above-described control mechanism of the compound transmission provides for simple control of a transmission with a large number of speeds by shifting the hand lever handle through the same path as that of the hand lever handle of a transmission having half as many speeds.
However, in case of failure of the pneumatic actuator or of one element of the system of valves controlling said pneumatic actuator, it becomes impossible to shift the ranges in the auxiliary two-range gearbox.
In such a case, when the high-gear range is engaged the vehicle will be unable to start from rest and move at a low speed to a repair shop.
Another known control mechanism of the compound transmission for a transport vehicle (DE, C, 3000577) has a main gearbox and a tandem-connected two-range auxil
REFERENCES:
patent: 3229551 (1966-01-01), Shickey
patent: 4060005 (1977-11-01), Bost
patent: 4440037 (1984-04-01), Foxton et al.
patent: 4621536 (1986-11-01), Takeuchi
Borodin Fedor N.
Gorfinkel Solomon I.
Kurzel Iosif A.
Braun Leslie A.
Ta Khoi Q.
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