Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1984-11-02
1986-10-07
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74360, 74477, 74745, G05G 912, G05G 510
Patent
active
046152334
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to transmission ratio selector mechanisms.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an improved form of transmission ratio selector mechanism which is suitable, amongst other uses, for use in selecting the operative ratio of a transmission of the form described and claimed in the Applicants UK Pat. No. 2055162.
According to the present invention there is provided a transmission ratio selector mechanism comprising an upper manually operable gear lever which is mounted intermediate its ends for pivotting about two perpendicular axes, a lower lever member which is pivotted in a fixed mount at its lower end and is operatively connected at its upper end with the lower end of the gear lever, the lower lever being interconnected intermediate its ends with a selector shaft whose longitudinal axis passes through the fixed mount, the arrangement being such that pivotting of the gear lever about one of the perpendicular axes causes axial displacement of the selector shaft in a direction parallel to its longitudinal axis and pivotting of the gear lever about the other perpendicular axis causes turning of the selector shaft about its longitudinal axis.
Preferably the selector shaft carries a formation which is engageable with a number of ratio selector members, axial displacement of the shaft being arranged to engage the formation with one or more selected ratio selector members and turning of the shaft being arranged to cause displacement of the ratio selector member or members engaged by the formation to effect ratio changes in an associated transmission.
Selection of at least one of the ratios of the associated transmission may involve engagement of the selector shaft formation with two selector members, displacement of both selector members by turning of the selector shaft, disengagement of one of the selector members from the formation by axially displacing the selector shaft, and further displacement of the other selector member by turning of the selector shaft, baulking means being provided to prevent axial displacement of the selector shaft except at the two limits of its turning and to ensure the correct reengagement of the formation with both selector members on selection of another ratio by the selector mechanism.
The operative connection between the gear lever and the lower lever may be via a cup-shaped member on one lever and a spherical or part-spherical member on the other member.
A given rotational position of the selector shaft may correspond to a neutral condition of the associated transmission, and when the shaft is in said given rotational position the gear lever can be pivotted to a range change position to effect a range change in the associated transmission.
The selector means preferably includes switch means which on each movement of the gear lever to the range change position alternately initiates changes between two ranges of the associated transmission.
In a preferred construction the mounting of the upper lever vibrationally isolates the upper lever relative to the lower lever. For example, the upper lever can be mounted from a tractor cab floor or operator's platform via a vibration isolating mount and the lower end of the lower lever mounted from the housing of the transmission.
The invention also provides a transmission ratio selector mechanism for a transmission having a multi-ratio main change speed gear and one or more range change gear sets in series, the selector mechanism including a manually operable selector member which is movable in a number of planes for the selection of the operative ratio of the main change speed gear and has a plane of movement corresponding to a neutral condition of the main change speed gear, the selector member being movable whilst in said neutral plane to a range change position to effect a change in the operative range of the associated transmission.
Preferably each movement of the selector member to the range change position initiates a change of the operative range of th
REFERENCES:
patent: 2052042 (1936-08-01), Thompson
patent: 2694943 (1954-11-01), Brumbaugh
patent: 3899934 (1975-08-01), Froumajou
patent: 3929029 (1975-12-01), Kelbel
patent: 4438657 (1984-03-01), Nobis
patent: 4455883 (1984-06-01), Radcliffe
Farris Robert L.
Herrmann Allan D.
Massey-Ferguson Services N.V.
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