JPH1113785A - Gar of manual transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of the bearing stress between a sleeve slid through-shift operation and the stopper part of a piece gear. SOLUTION: A manual transmission is formed so that a shift sleeve to exert a friction load on a synchronizer ring is axially slid, the shift sleeve is fitted in the synchronizer ring, and further the shift sleeve is slid to the piece gar 6 side rotated integrally with a gear for gear shift and fitted in a spline part 6b having the involute curve surface of the piece gear 6 and this way completes gear shift. A radially rising tooth-stopper part 6c making collision with the internal tooth part of the shift sleeve fitted in through the tooth part of a phase- synchronizing synchronizer ring is arranged jointly with the spline part 6b of the piece fear 6. The area of the end face of the stopper part 6c with which the internal teeth part of the shift sleeve is brought into abutment contact is increased to a value higher than that of an end face formed by the involute curve surface of the spline part 6b and bearing stress is reduced.

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 manual transmission, which regulates a spline portion of an involute curved surface which is phase-synchronized with a tooth profile portion of a synchronizer ring and a shift amount of a sleeve adjacent to the spline portion. The present invention relates to an improvement of a gear having a tooth-shaped stopper.

[0002]

2. Description of the Related Art As a synchronizer for a manual transmission, in order to synchronize rotation of a clutch hub and a transmission gear during a gear shift, a load is applied to the synchronizer ring and the synchronizer ring is frictionally engaged with the transmission gear. What is combined is known (JP-A-5-10346, etc.).
As shown in FIG. 1, this type of synchronizer includes a shift sleeve 4 for applying a frictional load to a synchronizer ring 5.
Slides in the axial direction to engage with the synchronizer ring 4, and further slides toward the piece gear 6 that rotates integrally with the transmission gear 2 to engage with the piece gear 6, thereby completing the gear shifting. For this reason, the spline portion 6 of the involute curved surface fitted to the internal teeth 4 a of the shift sleeve 4
In some cases, a stopper 6c that regulates the sliding stroke of the shift sleeve 4 is provided at the position b.

The stopper portion of the conventional piece gear has a shape as shown in FIG. FIG. 2 shows a conventional piece gear 8.
8a is a passive conical surface, 8b is a spline portion of an involute curved surface, 8c is a stopper portion, and 8c 'is a stopper surface. In the shift sleeve 4 that has slid toward the piece gear 8, the outer peripheral end surfaces of the internal teeth 8, 8c 'abut against the stopper surface 8c', and the sliding stroke is regulated.

[0004]

Since the stopper portion 8c of the conventional piece gear 8 is formed in a tooth shape that is obtained by extending the involute curved surface of the spline portion 8b as it is, it faces the outer peripheral end surface of the internal teeth 4a of the shift sleeve 4. Since the area of the stopper surface 8c 'is reduced and the surface pressure is increased, fretting wear or the like is generated, and the operation is rattled and the shift stroke is increased.

Accordingly, it is an object of the present invention to provide a gear of a manual transmission which can reduce the surface pressure of a stopper for restricting a sliding stroke of a shift sleeve.

[0006]

SUMMARY OF THE INVENTION A gear of a manual transmission according to the present invention, which has solved the above-mentioned problems, has a conical surface-shaped movable friction surface of a synchronizer ring, and a conical surface frictionally engaged with the friction surface. A passive friction surface portion, a spline portion of an involute curved surface connected to the passive friction surface portion and capable of phase synchronization with a tooth profile portion formed on the synchronizer ring, and a spline portion from the tooth profile portion of the synchronizer ring phase-synchronized. A gear of a manual transmission having a tooth-shaped stopper erected in the radial direction from the spline portion abutting against an internal tooth portion of the shift sleeve fitted to the shift sleeve, wherein the tooth shape of the stopper portion is It is characterized by expanding from the involute curved surface of the part.

[0007]

In the gear of the manual transmission according to the present invention, since the tooth profile of the stopper is expanded from the involute curved surface of the spline, the area of the end face of the stopper facing the internal teeth of the shift sleeve is increased. The surface pressure with the shift sleeve can be reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the gear of a manual transmission according to the present invention, the tooth shape of the stopper portion is such that both tooth surfaces thereof extend in the normal direction from the top edge of the involute curved surface of the spline portion. Thus, the area of the end face of the stopper portion facing the internal tooth portion of the shift sleeve can be increased.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on embodiments with reference to the drawings. A manual transmission according to an embodiment of the present invention is shown in FIG.
As shown in FIG. 1, a rotation shaft 1 for transmitting rotation, a speed change gear 2 rotatably mounted on the rotation shaft 1, and a speed change gear 2
And a clutch mechanism 3 having a clutch hub 3 held by the rotating shaft 1 and integrally rotating with the rotating shaft 1 adjacent to the clutch shaft 3 and spline-fitted to the outer periphery of the clutch hub 3 so as to be slidable in the axial direction by load input. And a synchronizer ring 5 that cooperates with the shift sleeve 4 and frictionally engages with the transmission gear 2.

More specifically, the synchronizer ring 5 and the transmission gear 2 have a conical concave surface and a conical convex surface which are fitted to each other. The synchronizer ring 5 is formed with a concave movable friction surface 5a. Gear 2 includes the transmission gear 2
Passive friction surface 6 convex to separate piece gear 6
a is formed. The synchronizer ring 5 has a toothed portion 5b on its outer periphery that is fitted with the internal teeth 4a of the shift sleeve 4.
The piece gear 6 has an involute curved spline portion 6b on the outer periphery which can be phase-synchronized with the tooth profile portion 5b.

A key 7 urged in the centrifugal direction at an intermittent position on the same circumference as the internal teeth 4a is fitted on the inner periphery of the shift sleeve 4 in a state fitted to the inner peripheral surface of the shift sleeve 4. Has been inserted. In the synchronizer having the above structure, when the shift sleeve 4 slides with the key 7 by, for example, the left side in the axial direction by the operation of a shift fork (not shown), the key 7 first comes into contact with the end face of the synchronizer ring 5, and the synchronizer A load is applied to the ring 5 on the left side. As a result, the movable friction surface 5a of the synchronizer ring 5 and the passive friction surface 6a of the piece gear 6 are frictionally engaged, and the rotation of the piece gear 6, that is, the speed change gear 2, approaches the rotation of the synchronizer ring 5. When the key 7 presses the end face of the synchronizer ring 5 to some extent, the key 7 is disengaged from the shift sleeve 4 and stops at the contact position, but the shift sleeve 4 slides further to the left. Then, when the tapered portion on the end face of the internal teeth 4a of the shift sleeve 4 is fitted to the similar tapered portion of the tooth profile portion 5b of the synchronizer ring 5, the frictional force between the movable friction surface 5a and the passive friction surface 6a is further increased. Becomes stronger, the spline portion 6b of the piece gear 6
And the tooth profile 5b of the synchronizer ring 5 are completely phase-synchronized, and the internal teeth 4a of the shift sleeve 4
With the spline portion 6b. Thus, the rotation of the rotating shaft 1 is transmitted to the transmission gear 2.

By the way, in order to restrict the sliding stroke of the shift sleeve 4, the stopper portion 6 against which the shift sleeve 4 abuts against the end of the spline portion 6b.
c is provided. As shown in FIG. 3, the stopper portion 6c of the present embodiment is substantially perpendicular to the top edges P, P of the involute curved surface of the spline portion 6b (both angles in the tooth thickness direction of the tooth tip surface of the spline portion 6b). It has an extended parallel tooth surface tooth profile. Therefore, the area of the stopper surface 6c 'is enlarged as compared with the case where the stopper surface 6c' is extended following the curved surface of the involute.

As described above, in the transmission gear of the present embodiment,
The area of the stopper surface 6c 'can be increased, and the surface pressure when the outer peripheral end surface of the internal teeth 4a of the shift sleeve 4 abuts is reduced. By reducing the surface pressure, fretting wear is suppressed, and rattling of the shift operation is reduced, and the shift stroke can be maintained. In the above embodiment, the tip surface of the stopper 6c and the two tooth surfaces intersect at substantially right angles, and the top of the stopper 6c is angular. However, as shown in FIG. Surface pressure uniformity can be obtained.

[0014]

As described above, according to the present invention, in the gear of a manual transmission having a stopper for restricting the sliding stroke of the shift sleeve, the surface pressure of the stopper is reduced and the operation feeling is reduced. Contributes to the goodness of

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a gear mechanism section employed in a gear of a manual transmission according to the present invention.

FIG. 2 is a diagram showing a part of gears of a conventional manual transmission.

FIG. 3 is a diagram showing a part of gears of the manual transmission according to one embodiment of the present invention.

FIG. 4 is a view showing a part of gears of a manual transmission according to another embodiment of the present invention.

[Explanation of symbols]

4 shift sleeve, 4a shift gear internal teeth, 5
... Synchronizer ring, 5a ... Movable friction surface, 5b ...
Tooth profile part of synchronizer ring, 6: piece gear (gear of manual transmission), 6a: passive friction surface, 6b: spline part, 6c: stopper part.

Claims (2)

[Claims] 1. A conical passive friction surface that faces a conical movable friction surface of a synchronizer ring and frictionally engages with the friction surface, and is formed on the synchronizer ring connected to the passive friction surface. A spline portion of an involute curved surface that can be phase-synchronized with the set tooth profile portion, and a diameter from the spline portion that abuts against the internal tooth portion of the shift sleeve fitted to the spline portion from the tooth profile portion of the synchronizer ring that is phase-synchronized. A gear for a manual transmission having a tooth-shaped stopper portion that stands in a direction, wherein the tooth shape of the stopper portion is wider than an involute curved surface of the spline portion. . 2. The gear of a manual transmission according to claim 1, wherein the tooth shape of the stopper portion has both tooth surfaces extending in a normal direction from a top edge of an involute curved surface of the spline portion.