Machine element or mechanism – Gearing – Interchangeably locked
Patent
1981-03-23
1983-10-18
Dorner, Kenneth
Machine element or mechanism
Gearing
Interchangeably locked
74339, 74360, 74357, 74359, F16H 506, F16H 338, F16H 308
Patent
active
044098570
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to transmissions and in particular to transmission ratio selecting mechanism.
In such fields as, for example, tractors and forklift trucks there is a requirement for transmissions which provide several ratios in the forward and reverse drive directions and a manual forward/reverse shuttle facility.
The applicant's UK Pat. No. 2,055,163 (Based on U.K. Patent Application No. 7,925,589) describes and claims an improved form of transmision assembly which provides two forward and two reverse drive ratios and which when used in combination with one or more other transmission units is capable of providing a large number of forward and reverse drive ratios.
The provision of an efficient and compact ratio selecting mechanism for a transmission assembly of the type described and claimed in the applicant's above referred to patent application and other transmission assemblies in which the selection of ratios involves the movement of more than one ratio coupling member (typically an axially movable sleeve or collar) is a difficult problem.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an improved form of ratio selecting mechanism which is compact and which is suitable for use with transmission assemblies of, for example, the type described and claimed in the applicant's previously referred to patent application.
According to the present invention there is provided a transmission ratio selecting mechanism including a ratio selector means, first and second ratio coupling members movable to select a number of ratios of an associated transmission, and linkage means for moving the ratio coupling members in response to movement of the ratio selector means, the ratio selecting mechanism being characterised in that the linkage means includes disconnecting means for disconnecting one of the ratio coupling members from the selector means during selection of at least one of the transmission ratios, the arrangement being such that for the selection of said at least one ratio both the gear coupling means are initially moved in synchronism in response to movement of the selector means to complete the first part of the selection of said at least one ratio, the disconnecting means is then operated, and selection of said at least one ratio is completed by further movement of only one of the ratio coupling means in response to further movement of the selector means, the selector means being arranged to return the ratio coupling members to synchronism on movement of the selector means to disengage said at least one ratio.
The linkage means may include a member which is angularly movable in response to movements of the selector means with first and second cam members arranged to be moved by the angularly movable member to move the first and second ratio coupling members respectively, and with the disconnecting means arranged to disconnect drive from the angularly movable member to one of the cam members during selection of said at least one ratio.
Conveniently the disconnecting means includes a toggle linkage connected with the selector means for displacing the angularly movable member in a direction generally parallel to its axis of angular movement to disconnect drive from said one cam member.
In one form of selecting mechanism in accordance with the invention, in which the coupling members are required to be moved in opposite direction to select said at least one ratio, the selector means may be arranged on initial movement to move both coupling members in the same direction to couple a gear wheel associated with one of said coupling members with an associated shaft and on further movement to operate said disconnecting means to move only the other coupling member in the opposite direction to couple a gear associated with the other coupling member with a further shaft to complete the selection of said at least one ratio.
A selecting mechanism of the form described in the preceding paragraph is particularly suitable for use in selecting the ratios of the transm
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Dorner Kenneth
Massey-Ferguson Services N.V.
Thompson John C.
Wright D.
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