Rotation position detection mechanism for trunnion axis
The invention is provided with an operation lever one end side of which is supported by the trunnion axis so as to be incapable of relative rotation and which is configured to be capable of rotating the trunnion axis, a follower lever a middle portion of which is supported by the trunnion axis so as to be capable of free relative rotation, and a detection switch. For the operation lever, a link for operating the operating lever is connected to the middle portion thereof so that, when rotated by the link, the other side end portion of the operating lever comes into tactile contact with other side end portion of the follower lever so as to rotate the follower lever in order to on/off the detection switch.
1. A rotation position detection mechanism for a trunnion axis in a hydraulic stepless transmission wherein, by way of a rotation operation of the trunnion axis, the rotation speed and the rotation direction of an output axis can be changed, comprising:
an operation lever whose one side end portion is supported by the trunnion axis so as to be incapable of relative rotation and which is configured to be capable of rotating the trunnion axis by rotating around the trunnion axis;
a follower lever whose middle portion is supported by the trunnion axis so as to be capable of free relative rotation; and
a detection switch which is turned on/off by one side end portion of the follower lever; wherein, for the operation lever, a link for operating the operation lever is connected to a middle portion thereof so that, when the operation lever is rotated to one direction from a predetermined rotation position by the link, one side end portion of the operation lever comes into tactile contact with one side end portion of the follower lever so as to rotate the follower lever in order to switch between on and off for the detection switch, whereas when the operation lever is rotated to another direction from the predetermined rotation position by the link, the one side end portion spaces apart from the one side end portion of the follower lever whereby the follower lever does not turn.
2. The rotation position detection mechanism for the trunnion axis according to claim 1 wherein,
the other side end portion of the operation lever or the other side end portion of the follower lever is configured to be detachable from the operation lever or the follower lever.
3. The rotation position detection mechanism for the trunnion axis according to claim 1 wherein,
the other side end portion of the follower lever has a contact pin which comes into tactile contact with the other side end portion of the operation lever.
4. The rotation position detection mechanism for the trunnion axis according to claim 1 wherein,
the detection switch has a projecting part to be switched on/off by pushing-in, and wherein,
the follower lever is activated by a biasing member in the direction of pushing-in the projecting part, and wherein,
the follower lever is rotated in a separating direction from the projecting part when the operation lever is turned.
5. The rotation position detection mechanism for the trunnion axis according to claim 4 wherein,
the detection switch is attached through an attachment plate and disposed in the vicinity of the follower lever, wherein,
the attachment plate comes into tactile contact with the follower lever before the entire projecting portion is pushed into the detection switch.
6. The rotation position detection mechanism for the trunnion axis according to claim 4 wherein,
the detection switch is activated by the biasing member through a pushing-in member, wherein,
the pushing-in member is configured to be capable of reciprocating only in the pushing-in direction.
7. The rotation position detection mechanism for the trunnion axis according to claim 2 wherein,
the other side end portion of the follower lever has a contact pin which comes into tactile contact with the other side end portion of the operation lever.