JPH1151077A - Synchronizer of transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the contact of a cone taper surface with a synchro-ring which may possible occur in a playing rotation time other than a synchronous operation time. SOLUTION: While this synchronizer of transmission is formed of an inclined surface which is displaced to the front side in the rotating direction as separating a notch 6 formed at a hub 5, and fitting surfaces 6a and 8a at the front side in the rotating direction in an index stopper 8 which is provided at the synchro-ring 7, fitting surfaces 6b and 8b at the rear side in the rotating direction in the notch 6 and the index stopper 8 are formed of inclined surfaces which are displaced to the rear side in the rotating direction respectively. As a result, the synchro-ring 7 is pulled to the hub 5 side and held so as to avoid the contact with a cone taper surface, by the guide operation of the notch 6, and the fitting surfaces 6a, 8a, 6b, and 8b of the index stopper 8, in a playing rotation time other than a synchronous operation time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizing device for a transmission, and more particularly to a synchronizing ring in which the contact between a cone taper surface and a synchro ring during idle rotation other than a synchronous operation can be suppressed to prevent wear. It relates to a synchronization device.

[0002]

2. Description of the Related Art As a conventional example of a transmission synchronizing device, for example, as shown in FIGS.
A clutch gear 3 is provided on a transmission gear 2 rotatably mounted on the clutch gear 3, and a cone tapered surface 4 is formed on the clutch gear 3. A notch 6 is formed on the side surface of the hub 5 spline-fitted to the main shaft 1, and an index stopper 8 protruding from a side surface of a synchro ring 7 rotatably mounted on the cone tapered surface 4 is provided with the notch. 6 with play and rush engagement.

A sleeve 9 slidably engaged with and held by the hub 5 is meshed with the clutch gear 3 via a synchro ring 7 so that the synchro ring 7 is engaged before the sleeve 9 meshes with the clutch gear 3. The sleeve 9 and the clutch gear 3 are smoothly engaged by synchronizing the rotational speed of the clutch gear 3 with the rotational speed of the hub 5 by being pressed against the cone taper surface 4. Reference numeral 10 denotes a synchronizer key, and reference numeral 11 denotes an input shaft. In FIG. 3, only the front end of the main shaft 1 and the rear end of the input shaft 11 of the vehicle transmission are shown, and other parts are omitted.

In such a synchronizing device, the synchro ring 7 is rotated by being pushed by the hub 5. However, in the prior art, as shown in FIG. 4, the contact surfaces 8a and 6a of the index stopper 8 and the notch 6 are each formed of a plane perpendicular to the rotation direction of the synchro ring 7, so that the notch is used except during the synchronous operation. The behavior of the synchro ring 7 is not restricted except for the engagement between the index ring 8 and the index ring 8.

Accordingly, in the case of the conventional synchronizing device, the synchro ring 7 may move toward the clutch gear 3 and come into contact with the cone taper surface 4 even during the idle rotation other than the synchronization operation. There is a possibility that the wear of the sync ring 4 or the synchro ring 7 is promoted. In order to solve such a situation, it is effective to provide a spring or the like for urging the synchro ring toward the hub. However, in this case, the structure of the synchronizing device becomes complicated and the manufacturing cost is reduced. There is a problem that is raised.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to prevent the contact between the cone taper surface and the synchro ring during idle rotation other than the synchronous operation without increasing the manufacturing cost. It is an object of the present invention to provide a synchronizing device capable of suppressing wear and avoiding wear.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method in which a notch formed in a hub and an abutment surface formed in an index stopper formed in a synchro ring on the rotational front side are separated from the synchro ring. While it is formed with an inclined surface displaced forward in the rotation direction,
The contact surface of the notch and the index stopper at the rear in the rotation direction is formed by an inclined surface displaced rearward in the rotation direction.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a hub and a synchro ring showing an embodiment of a transmission synchronizing device according to the present invention, and FIG. 2 is a schematic plan view showing a relationship between an index stopper of the synchro ring and a notch of the hub. Portions having the same functions as those of the conventional example shown in FIGS.

That is, in the present embodiment, a flat dovetail-shaped notch 6 that gradually expands toward the center side is formed in the hub 5, and the flat dovetail-shaped notch 6 that gradually expands as the distance from the synchro ring 7 increases. By forming the index stopper 8 on the synchro ring 7,
The contact surfaces 6a, 8a on the front side in the rotational direction of the notch 6 and the index stopper 8 are formed as inclined surfaces that are displaced forward in the rotational direction as they are separated from the synchro ring 7, and the contact surfaces 6b, 8b on the rear side in the rotational direction. Each is formed by an inclined surface displaced rearward in the rotation direction.

In the synchronizer constructed as described above, the contact surfaces 6a, 8a of the notch 6 and the index stopper 8 on the front side in the rotational direction are respectively displaced forward in the rotational direction as the distance from the synchro ring 7 increases. And the contact surfaces 6b, 8b at the rear in the rotation direction.
Are formed by inclined surfaces displaced rearward in the rotational direction, the index stopper 7 is drawn toward the hub 5 by the guide action of the contact surface 6b of the hub 5 and the contact surface 8b of the index stopper 7.

In other words, when the synchro ring 7 is idled without being pressed against the cone taper surface, the rotation of the hub 5 is transmitted to the synchro ring 7 via the notch 6 and the index stopper 8, so that the rear end in the rotation direction is hit. Surface 6b,
The synchro ring 7 is drawn toward the hub 5 by the guide action of 8b. When the synchro ring 7 is pressed against the cone taper surface and the engagement between the sleeve and the conical taper surface is continued despite the engagement of the sleeve being completed with the end of the synchronous operation, the hub 5 is connected to the hub 5. A speed difference occurs between the synchro rings 7.

When the synchro ring 7 attempts to rotate at a higher speed than the hub 5 due to the speed difference, the pulling action is performed by the guide action of the contact surfaces 6a and 8a in front of the rotation, and the synchro ring 7 is moved from the hub 5 by the pulling action. When the motor is to be rotated at a low speed, the pulling action on the synchro ring 7 is performed by the guide action of the contact surfaces 6b and 8b at the rear of the rotation.
Is always drawn to and held by the hub 5.

Therefore, during idle rotation other than during the synchronous operation, the synchro ring 7 is attracted to the hub 5 and held to avoid contact with the cone taper surface, and the synchro ring 7 contacts the cone taper surface more than necessary. Is prevented, and wear of both is suppressed.

Incidentally, the inclination angles of the notches 6 and the contact surfaces 6a, 6b, 8a, 8b of the index stopper 8 may be set to such an extent that the synchronous operation of the synchro ring 7 is not significantly affected. The inclination of the contact surfaces 6a, 6b, 8a, 8b of the index stopper 8 can be easily formed at the time of molding the component coarse material or by machining performed after the molding.

[0015]

As is apparent from the above description, the present invention can be applied to the case where the notches formed in the hub and the index stoppers formed in the synchro ring are rotated in front of the synchro ring as the respective contact surfaces on the front side in the rotation direction are separated from the synchro ring. , And the notch and index stopper at the rear side in the rotational direction are formed with inclined planes displaced rearward in the rotational direction, respectively, so they operate synchronously without increasing the number of parts. At idle rotation other than when the notch and index stopper guide the synchro ring to the hub side and hold it to avoid contact with the cone taper surface, the contact between the synchro ring and the cone taper surface is suppressed. Thus, wear of both can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hub and a synchro ring showing an embodiment of a transmission synchronization device according to the present invention.

FIG. 2 is a schematic plan view showing a relationship between an index stopper of the synchro ring shown in FIG. 1 and a notch of a hub.

FIG. 3 is a sectional view showing a conventional example of a transmission synchronization device.

4 is a schematic plan view showing a relationship between a notch of a hub and an index stopper of a synchro ring shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft 2 Transmission gear 3 Clutch gear 4 Cone taper surface 5 Hub 6 Notch 6a, 6b Contact surface 7 Synchro ring 8 Index stopper 8a, 8b Contact surface 9 Sleeve

Claims (1)

[Claims] 1. A synchro ring rotatably mounted on a cone taper surface formed on a clutch gear, a hub formed with a notch in which an index stopper of the synchro ring is engaged with play, and a hub slidably mounted on the hub. A synchronizing device for a transmission, comprising a sleeve engaged and held, and meshing the sleeve with a clutch gear via a synchro ring to synchronize the clutch gear with the hub. The contact surfaces on the side were formed with inclined surfaces that were displaced forward in the rotational direction as they were separated from the synchro ring, and the contact surfaces on the notch and index stopper that were rearward in the rotational direction were formed with inclined surfaces that were displaced rearward in the rotational direction. A synchronizing device for a transmission.