JPH0738739Y2 - Rotation synchronizer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotation synchronizing device used in a manual transmission or the like.

2. Description of the Related Art As a rotation synchronizer of this type, for example, Japanese Patent Publication No. 46-17
There is a double synchro cone type disclosed in Japanese Patent No. 642. In this double synchro cone, the balk ring is concentrically divided into two parts on the inner peripheral side and the outer peripheral side, and a ring-shaped cone ring is arranged between the two divided outer synchro rings and the inner synchro ring to enable relative rotation. When two members, for example, the gear and the synchro hub are rotationally synchronized, a large frictional force is generated by the conical friction surfaces provided between the outer synchro ring and the cone ring and between the cone ring and the inner synchro ring. It is becoming like this.

By the way, in such a double synchro cone type synchronizer, in order for the cone ring and the inner synchro ring to come into pressure contact with each other, it is necessary to move the cone ring. It is attached to the member side so as to be locked in the rotational direction and movable in the axial direction. The cone ring is usually attached to a dog gear (clutch gear) which is integrally rotatably mounted on the gear. As shown in FIG.
The protrusion 3 of the cone ring is fitted in the hole 2 formed in the hole 2, and the protrusion 3 relatively moves in the central axis direction of the hole 2 to allow the movement of the cone ring.
The cone ring and the dog gear 1 are locked in the rotating direction by contacting both sides of the inner ring with the inner periphery of the hole 2.

However, in the conventional double synchro cone type synchronizer, the hole 2 formed in the dog gear 1 is usually formed into a circular hole by a drilling process or the like because of the workability problem. On the other hand, the protrusion 3 formed on the cone ring is
As shown in FIG. 4, since it is designed to be cut out from the ring-shaped cone ring 4, it has a substantially rectangular cross section.

Therefore, when the protrusion 3 is fitted into the circular hole 2, the corner 3a of the protrusion 3 comes into contact with the circular hole 2 as shown in FIG. Therefore, even if a slight error occurs in the dimensional accuracy of the projection 3 in the thickness direction as shown by the broken line in the figure, the gap δ between the projection 3 and the inner circumference of the circular hole 2 is large. It changes, and the play in the rotational direction between the cone ring 4 and the dog gear 1 increases.

Further, as described above, since the corner portion 3a is in line contact with the inner circumference of the circular hole 2, the contact area between the two is significantly reduced, and wear is greatly promoted. Therefore, there is a problem that the play in the rotational direction between the cone ring 4 and the dog gear 1 is further increased even by the accelerated wear.

In view of the above, the present invention aims to provide a rotation synchronizing device in which the protrusion and the inner circumference of the circular hole are in surface contact with each other to significantly reduce the play between them.

Means and Actions for Solving the Problems To achieve the above object, the present invention provides a sleeve provided on one side of one of two relatively rotatable members to allow axial movement, and a conical friction. A balk ring having a surface and axially pressed by the movement of the sleeve, a dog gear mounted on the other member side and having circular holes formed at a plurality of positions along the circumferential direction, and a dog gear side A plurality of protrusions having a substantially quadrangular cross section are formed along the circumferential direction on the end face of the, and the protrusions are fitted in a circular hole formed in the dog gear so as to be movable in the axial direction and locked in the rotation direction. Together with a cone ring having a conical friction surface corresponding to the balk ring, via a conical friction surface between the cone ring and the balk ring,
In a rotation synchronizer configured to perform rotation synchronization between the two members when the balk ring is pressed, both circumferential end faces of the projection of the cone ring have a curvature that is the same as or slightly larger than the curvature of the inner circumference of the circular hole. It is characterized by being formed on a curved surface. As a result, the curved surface portion of the protrusion comes into surface contact with the inner circumference of the circular hole.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a rotation synchronizer 10 used in a manual transmission according to an embodiment of the present invention. The rotation synchronizer 10 includes a power transmission shaft 12 such as an input shaft shifter, an output shaft shifter, or a counter shaft shifter. Bearing on power transmission shaft 12
It is arranged between two members of a transmission gear 16 such as a main gear and a counter gear, which are relatively rotatably fitted to each other via 14,
Rotational synchronization between the power transmission shaft 12 and the transmission gear 16 is performed.

That is, the rotation synchronizer 10 includes a synchro hub 18 spline-fitted to the power transmission shaft 12, and a coupling sleeve 20 spline-fitted to the outer periphery of the synchro hub 18.
Doggear which is attached to the transmission gear 16 so as to be rotatable integrally therewith.
22, the dog gear 22 and the coupling sleeve 20
And a balk ring 24 disposed between the two, and an insert member 26 inserted into the spline fitting portion of the synchronizing hub 18 and the coupling sleeve 20.

The balk ring 24 is divided into an outer synch cone 30 and an inner synch cone 32 to form a double synch cone, and between these synch cones 30 and 32, a cone ring 38 is provided via conical friction surfaces 34 and 36. It is arranged. The outer and inner synch cones 3
The convex portions 30a and the concave portion 32a make the units 0 and 32 integral with each other in the rotation direction, and are relatively rotatable in the axial direction. Further, at the end of the cone ring 38 on the dog gear 22 side, projections 40 having a substantially quadrangular cross section are provided at substantially equal intervals in the circumferential direction, while the dog gear 22 corresponds to the projections 40, respectively. A circular hole 42 is formed, and the protrusion 40 is formed in the circular hole 42 as shown in FIG.
Are fitted.

Here, in the present embodiment, as shown in the figure, both circumferential end surfaces of the protrusion 40 are formed into a curved surface having a slightly larger curvature than the inner circumference of the circular hole 42, The curved surface portions 44 at both ends are fitted in the circular hole 42 in a state of being in close contact with each other. The curved surface portion 44 may be formed to have the same curvature as the inner circumference of the circular hole 42.

In the rotation synchronizer 10 of the present embodiment having the above configuration, the coupling sleeve 20 is fitted through the shift fork (not shown) fitted in the circumferential groove 20a of the coupling sleeve 20.
Moves in the axial direction, and along with this, the insert member 26 also moves, and the tip of the insert member 26 presses the outer synchro cone 30. Then, the outer synchro cone 30
And the cone ring 38 contact each other through the conical friction surface 34, and further, the cone ring 38 and the inner synch cone 32 contact each other through the conical friction surface 36 by the axial movement of the cone ring 38. Due to the contact resistance at this time, the gear portion 30a formed on the outer peripheral portion of the outer synchro cone 30 relatively rotates with respect to the coupling sleeve 20 by a preset allowable amount, and further movement of the coupling sleeve 20 causes The spline portion tip changer of the coupling sleeve 20 comes into an index state in which it contacts the gear portion 30a tip changer. In this state, the coupling sleeve
When 20 is further pressed, this pressing force causes the conical friction surfaces 34,3
6 is converted into a frictional force, and the frictional force synchronizes the rotation between the power transmission shaft 12 and the transmission gear 16. Then, after the synchronization is completed, the spline portion of the coupling sleeve 20 is engaged with the gear portion 30a by pressing the respective chamfers separately, and further, the spline portion is rotationally synchronized with the gear portion of the dog gear 22.
The gear shifting operation is completed by being easily meshed with 22a.

By the way, in this embodiment, the protrusion of the cone ring 38
A curved surface portion 44 is formed on the 40, and the curved surface portion 44 is attached to the dog gear 22.
Since the inner circumference of the circular hole 42 of the
Surface contact can be made between them. Therefore, when a large frictional force is generated on the conical friction surfaces 34, 36 during rotation synchronization, a large torque acts between the protrusion 40 and the circular hole 42. And wear can be reduced. Further, when the cone ring 38 is moved in the axial direction, relative sliding is performed between the protrusion 40 and the circular hole 42, but even at this time, the two are in surface contact with each other, so that wear is suppressed. Can be planned. Further, since the radial center portions of both ends of the protrusion 40 are in contact with the inner circumference of the circular hole 42 as the curved surface portion 44, as shown by the broken line in FIG. 2, there is a formation error in the thickness direction of the protrusion 40. Even if it occurs, it is possible to prevent the gap between the protrusion 40 and the circular hole 42 from changing.

Effects of the Invention As described above, in the rotation synchronizing device of the present invention,
Since both end faces in the circumferential direction of the protrusion of the cone ring that fits in the circular hole of the dog gear are formed as curved surfaces that have a curvature that is the same as or slightly larger than the curvature of the inner periphery of the circular hole, a surface between the protrusion and the circular hole is a surface. Can be contacted. Therefore, it is possible to prevent the gap between the circular hole from changing due to the formation error of the protruding portion, and it is possible to remarkably reduce the wear between the protruding portion and the circular hole, thereby preventing the backlash between them. It can be suppressed significantly. For this reason, it is possible to prevent or significantly reduce rattling noise caused by gear shift operation, engine vibration, and the like, and it is possible to remarkably improve durability of the synchronizing device.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotation synchronizer showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of an essential part taken along line II-II in FIG.
FIG. 3 is an enlarged cross-sectional view of an essential part corresponding to FIG. 2 of a conventional rotation synchronizer, and FIG. 4 is a perspective view of an essential part of a cone ring used in the conventional rotation synchronizer. 10 ... Rotation synchronizer, 12 ... Power transmission shaft, 16 ... Shift gear, 20
… Coupling sleeve, 22… Dog gear, 24… Balk ring, 34, 36… Cone friction surface, 38… Cone ring, 40…
Protrusion, 42 ... Circular hole, 44 ... Curved part.

Claims (1)

[Scope of utility model registration request] 1. A relatively rotatable two member is provided on one member side of the two members.
A sleeve provided to allow axial movement, a balk ring having a conical friction surface and being axially pressed by the movement of the sleeve, and a baud ring mounted on the other member side and extending along the circumferential direction. A dog gear with circular holes formed at multiple points, and a plurality of protrusions with a substantially square cross section along the circumferential direction on the end face on the dog gear side, and the protrusions move axially in the circular holes formed in the dog gear. And a cone ring having a conical friction surface corresponding to the balk ring, which is locked in the rotation direction by being fitted so that the conical friction surface between the cone ring and the balk ring is Through the 2 when pressing the balk ring.
In a rotation synchronizer adapted to perform rotation synchronization between members, both end faces in the circumferential direction of the protrusion of the cone ring are formed into curved surfaces having a curvature that is the same as or slightly larger than the curvature of the inner circumference of the circular hole. And a rotation synchronizer.