JPH0137230Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a synchronized meshing device for a synchronous mesh transmission.

Conventionally, a synchronized meshing type synchronized mesh device has a shifting key that is housed in a key groove formed on the outer periphery of a synchronized hub so as to be movable in the axial direction. is a synchronizer that engages with a synchronizer ring at its end in a rotational direction to transmit the rotation of the synchronizer hub to the synchronizer ring, and engages with the outer periphery of the synchronizer hub in an axially movable manner. The synchronizer ring is driven in the axial direction by the sleeve and is configured to press the synchronizer ring against the tapered cone portion of the transmission gear. However, in the conventional device described above, when the synchro sleeve is moved in the axial direction by a shift operation, the shifting key tilts against the action of the key spring, and there is nothing to limit this tilt. There are drawbacks such as the shifting key tilting more than necessary and protruding from the keyway, hindering smooth shifting operations.

The present invention was made to solve the above-mentioned drawbacks of the conventional device, and in a synchronized mesh device, it is necessary to rotate the synchronizer ring to a predetermined degree with respect to the synchro hub at the beginning of synchronization. The pressing force of the synchronizer ring is reduced by partially removing the inner spline part of the synchronizer sleeve, and then a spring plate made of spring steel is fastened to the synchro sleeve with rivets or bolts. A mesh device is provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of the synchromesh device according to the present invention, and FIG. 2 is a sectional view taken along the line A-A in FIG. , 2 are loosely fitted around a driven shaft (not shown) that transmits output to the wheels of an automobile, and a synchro hub 3 is spline-fitted to the driven shaft.

The drive gears 1, 2 and the driven shaft are connected by an inner spline 4a of the synchro sleeve 4 that meshes with an outer spline formed on the outer periphery of the synchro hub 3.
This is done by meshing with the outer splines 5a, 6a of the spline pieces 5, 6 fixed to the drive gears 1, 2, and in the middle of this meshing, the inner spline 4a of the synchro sleeve 4 is engaged.
are the connecting teeth 7a, 8 of the synchronizer rings 7, 8.
By meshing with b, the drive gears 1 and 2 are synchronized with the synchro hub 3.

In addition, a recess 3a is formed by removing a portion of the outer spline formed on the outer circumference of the synchro hub 3, and a portion of the inner spline 4a of the synchro sleeve 4 corresponding to the recess 3a is removed. In the recess 4b of the synchro sleeve 4, a spring plate 9 such as a detent spring made of spring steel or an equivalent material as shown in FIG.
0 and is fastened to the synchro sleeve 4.

At this time, at the rotational end of the spring plate 9, there is a distance δ between the recess 3a of the synchronizer hub 3 and the protrusion 7a or 8a of the synchronizer ring 7 or 8. One of the contact portions provided at both ends of the spring plate 9 presses the end face of either one of the synchronizer rings 7 or 8. This causes the rings 7, 8 to frictionally engage with the conical surface formed on the spline piece 5 or 6. At this time, the protrusion 7a or 8a of the synchronizer ring 7 or 8 rotates around the axis of the hub 3 by δ relative to the recess 3a of the synchronizer hub 3, and the inner spline of the synchronizer sleeve 4 and the synchronizer ring 7 or 8 are rotated by δ. When the meshing of the synchronizer ring 7 or 8 and the spline piece 5 or 6 becomes impossible and the pressing force of the spring plate 9 against the protrusion 7a or 8a increases, the relative rotational speed difference between the synchronizer ring 7 or 8 and the spline piece 5 or 6 disappears, and the spring plate 9 The contact portion is elastically deformed and rides on the upper surface of the synchronizer ring 7 or 8, and the inner spline 4a meshes with the connecting tooth 7b or 8b of the synchronizer ring 7 or 8, and also meshes with the outer spline 5a or 6a.

As explained in detail above, the synchronized mesh device of the transmission according to the present invention has a simple structure, can shorten the axial length, and can reduce the weight of the synchronized mesh device. It is possible to increase the gear strength.

In addition, according to the present invention, there is no problem of keys popping out or falling off compared to those using synchro keys of conventional structure, and it is possible to increase the diameter of the taper cone of the synchronizer ring, which reduces shift operation force. It has practical effects such as being able to reduce the

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A--A in FIG. 1, and FIG. 3 is a perspective view of a spring plate according to the present invention. 1, 2... Drive gear, 3... Synchro hub, 3
a... recess, 4... synchro sleeve, 4a...
Internal spline, 4b... recess, 5, 6... spline piece, 7, 8... synchronizer ring,
7a, 8a... protrusion, 7b, 8b... bonding tooth,
9...Spring plate.

Claims (1)

[Scope of utility model registration request] In a synchronous mesh transmission,
A plurality of recesses are formed in predetermined positions on the outer spline formed on the outer circumference of the synchronizer hub, and a plurality of recesses are formed by removing a portion of the synchronizer ring, and the synchronizer ring is loosely fitted into the recesses from the left and right to engage the outer circumference of the pair of left and right synchronizer rings excluding the connecting teeth. a plurality of recesses are formed by removing a part of the inner spline of the synchronizer sleeve corresponding to the recesses, and contact parts capable of abutting against the projections of the synchronizer ring are provided at both ends of the recesses. A synchromeshing device for a transmission, characterized in that formed spring steel spring plates are fastened with rivets or bolts.