Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1988-06-03
1992-08-18
Herrmann, Allan D.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74473R, G05G 902, F16H 5902
Patent
active
051388952
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to transmission ratio selector mechanisms and in particular to such mechanisms for selecting the operative ratio in a transmission with two ratio selector couplers (for example synchromesh couplers) both of which must be engaged to provide drive through the transmission. An example of such a transmission is described and claimed in the Applicants's UK Patent No. 2055162.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an improved form of selector mechanism which is suitable for use in selecting the operative ratio of the above type of transmission.
Thus according to the present invention there is provided a transmission ratio selector mechanism for a transmission having two ratio selector couplers both of which must be engaged to provide drive through the transmission, said selector mechanism including a selector shaft which is rotatable about its longitudinal axis and also axially movable parallel to its longitudinal axis, said rotation of the shaft being arranged to operate one coupler and said axial movement of the shaft being arranged to operate the other coupler.
Preferably the selector mechanism includes interlock means to ensure that during any ratio change involving the engaging of both couplers a particular one of said couplers is always engaged before the other coupler.
The interlock means may include a formation on or movable with the shaft which co-operates with a formation movable with the coupler which is to be engaged first to ensure that the required movement of the shaft to engage said second coupler cannot be effected until engagement of said first coupler has been completed.
In a preferred arrangement rotation of the shaft is arranged to displace the associated coupler via a mechanical linkage and axial displacement of the shaft operates a valve mechanism to displace the associated coupler using fluid pressure acting via a fluid pressure operated actuator.
The mechanical linkage preferably includes a first shifting formation associated with the coupler, a lever engaged at one end in the first formation and provided at the other end with a second formation, the lever being pivoted intermediate its ends about an axis generally at right angles to the direction of shifting of the coupler, and selector means carried on the shaft and moveable therewith in first and second opposite directions on rotation of the shaft, said selector means engaging directly with the first formation in one axial position of the shaft so that movement of the selector means in said first and second directions moves said coupler in corresponding first and second directions, said selector means engaging said second formation in another axial position of the shaft so that movement of said selector means in first and second directions reverses the direction of movement of the coupler via the lever so that the coupler moves in said second and first directions respectively.
The present invention also provides a ratio selector mechanism for the operation of an axially shiftable ratio selector coupler, the selector mechanism being characterized by including a first shifting formation associated with the coupler, a lever engaged at one end with the first formation and provided at the other end with a second formation, the lever being pivoted intermediate its ends about an axis generally at right angles to the direction of shifting of the coupler, and selector means movable in first and second opposite directions and engagable either directly with the first formation so that movement of the selector means in said first and second directions moves said coupler in corresponding first and second directions or alternatively with said second formation so that movement of said selector means in said first and second directions reverses the direction of movement of the coupler via the lever so that the coupler moves in said second and first directions respectively.
DESCRIPTION OF THE DRAWINGS
One embodiment of the present invention as applied to a ratio se
REFERENCES:
patent: 3853019 (1974-12-01), McAdams
patent: 4290318 (1981-09-01), Ookubo et al.
patent: 4307624 (1981-12-01), Mylenek
patent: 4615233 (1986-10-01), Lasoen
patent: 4712640 (1987-12-01), Leigh-Monstevens et al.
patent: 4757726 (1988-07-01), Yamaguchi
patent: 4784009 (1988-11-01), Sakamoto et al.
patent: 4793202 (1988-12-01), Okubo
patent: 4793378 (1988-12-01), Loeffler et al.
patent: 4799399 (1989-01-01), Bruce
Herrmann Allan D.
Krolikowski Julie
Massey-Ferguson Services N.V.
LandOfFree
Transmission ratio selector mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmission ratio selector mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmission ratio selector mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1240430