JPH0744824Y2 - Synchronous meshing device for transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a synchronous meshing device for a transmission of an automobile.

<Prior Art> As a synchronous meshing device for a transmission, a BorgWarner-type device for generating wear torque in a cone clutch due to a difference in peripheral speed and synchronizing by using the wear torque is often used.

The general structure of this device is, as shown in FIG. 3, an inner cone bush 1 that rotates integrally with a synchronizing hub 5.
And an inner cone 2a that allows relative rotation of a required rotation angle on the outer periphery of the inner cone bush 1 and engages with the pin 14 in the rotation direction, and is formed integrally with the inner cone 2a,
A synchro ring 2b having teeth 10 on its outer circumference, an input gear 8 rotatably supported on a main shaft 7 via a bearing 9, and a gear dog 11 which rotates integrally with the input gear 8.
And an outer cone 12 which engages with the gear dog 11 in the rotational direction and wears the tapered surface formed on the synchro ring 2b and the inner cone 2, and which is spline-fitted to the outer periphery of the synchro hub 5. Synchronizing by shifting the sleeve 6 to the right in FIG.
Abut the tooth 10 of 2b for synchronization, and further synchronize ring 2b
This is a structure for carrying out a two-step insertion operation in which the teeth 10 of the above are scraped and meshed with the gear dog 11.

<Problems to be Solved by the Invention> In the above-mentioned conventional device, the synchronous operation force is reduced by using the double cone synchro, but the synchro sleeve 6 contacts the teeth 10 of the synchro ring 2b to synchronize.
Further, since the gear dog 11 comes into engagement with the gear in two stages, the overall operating force is the synchronous operating force A as shown in FIG.
And the operating force B has two steps, and as a result, the operating force is increased as in the single cone.

An object of the present invention is to position the teeth of the synchro ring in the same phase as the gear dog to eliminate the two-stepped operation force B and reduce the operation force after synchronization.

<Means for Solving the Problems> The featured configuration of the present invention for achieving the above object is to provide an inner cone bush that rotates integrally with the synchronizing hub, and a required rotation angle on the outer circumference of the inner cone bush. An inner cone that allows relative rotation and engages in the direction of rotation, a synchronizing ring that is formed integrally with this inner cone and that has teeth on its outer periphery, and is rotatably supported by bearings on the main shaft. And a gear dog that rotates integrally with the input gear, and an outer cone that engages with the gear dog in the direction of rotation and that makes frictional contact with the tapered surfaces formed on the synchronizing ring and the inner cone. In the above, the input gear is provided with a plunger pressed by a spring in the direction of the inner cone, and the plunger is engaged with the inner cone. And a positioning recess for positioning the teeth of the synchro ring in the same phase as the gear dog.

<Operation> According to the present invention, with the above structure, the plunger is engaged with the positioning recess of the inner cone when the synchronizing is completed when the synchronizing sleeve is engaged with the synchronizing ring, and the teeth of the synchronizing ring are phase-positioned with the gear dog. And then
The synchro sleeve enters smoothly and meshes without hitting the gear dog.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an inner cone bush that rotates integrally with the synchronizing hub 5, and 2a is the outer periphery of the inner cone bush 1 that allows relative rotation at a required rotation angle and the rotation direction is linked by a pin 14. It is the inner cone that fits. Reference numeral 2b is a synchro ring which is formed integrally with the inner cone 2a and has teeth 10 provided on the outer periphery thereof.

Reference numeral 8 denotes an input gear rotatably supported on the main shaft 7 via a bearing 9. The input gear 8 is provided with a gear dog 11 that rotates integrally with the input gear 8. The double cone type synchronous meshing device is provided with an outer cone 12 which engages in the direction and makes frictional contact with the tapered surface formed on the synchronizing ring 2b and the inner cone 2.

According to the present invention, in the above structure, the input gear 8 has a spring.
Plunger pressed by 16 toward inner cone 2a
15, the inner cone 2a is provided with a positioning recess 17 for engaging the plunger 15 and positioning the teeth 10 of the synchronizing ring 2bb in the same phase as the gear dog 11.

Since the present invention has the structure as described above, as shown in FIG. 2, when the synchronizing sleeve 6 shifts to the right in the figure and abuts against the tooth 10 of the synchronizing ring 2b, when this is scraped off and synchronization is completed, The plunger 15 engages with the positioning recessed portion 17 provided in the inner cone 2a, and positions the teeth 10 of the synchronizing ring 2b and the gear dog 11 in the same phase. Therefore, the synchronizing sleeve 6 does not hit the gear dog 11 and smoothly meshes with the gear dog 11 without resistance.

<Effect of the Invention> As described above, according to the present invention, the input gear is provided with the plunger pressed by the spring in the inner cone direction,
Since the inner cone is provided with a positioning recess in which the teeth of the synchro ring and the gear dog are engaged with the plunger in the same phase, the synchro ring is separated from the teeth of the synchro ring by the synchro ring when the synchronization is completed. Since the teeth of and the gear dog are positioned in the same phase,
The synchro sleeve smoothly meshes with the gear dog without resistance, and has the advantage that the operation force for entering the two steps is almost eliminated and the effect of reducing the operation force of the double-cone synchro is further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of the device of the present invention, FIG.
FIG. 3 is a cross-sectional view of a conventional device, FIG. 4 is a diagram for explaining the operation, and FIG. 5 is a graph showing the operating force of the conventional device. 1 ... Inner cone bush, 2a ... Inner cone, 5 ... Synchro hub, 6 ... Synchro sleeve, 8 ... Input gear, 10
… Synchro ring, 11… Gear dog, 12… Outer cone, 15… Plunger, 16… Spring, 17… Positioning recess.

Claims (1)

[Scope of utility model registration request] 1. An inner cone bush that rotates integrally with a synchronizing hub, an inner cone that allows relative rotation of a required rotation angle on the outer periphery of the inner cone bush and engages in the direction of rotation, and an inner cone that is integral with this inner cone. The synchro ring, which has teeth formed on its outer circumference, the input gear that is rotatably supported on the main shaft via bearings, the gear dog that rotates integrally with this input gear, and the rotation direction of this gear dog. In a synchronous meshing device provided with an outer cone that is engaged and frictionally contacts a tapered surface formed on the synchro ring and the inner cone, the input gear is provided with a plunger pressed by a spring in the inner cone direction, and the inner cone is provided with Positioning recess for engaging the plunger to position the teeth of the synchro ring in phase with the gear dog Synchromesh device for a transmission, wherein a provided.