JPH07332386A - Synchronous meshing device - Google Patents

Abstract

PURPOSE:To enable the smooth meshing between both the dogs, even if a traction torque acts on a synchronous ring, after the completion of the meshing of the synchronous ring of a hub sleeve, by engaging a projection which projects from the end wall of a dog gear, keeping a gap in the peripheral direction, with a cut formed on the end wall of the adjusting ring of a synchronous meshing device. CONSTITUTION:A key 4 is elastically supported on a hub sleeve 2 which is spline-fitted with a rotary shaft 44, and a conical shaft part 42, shaft part 42a, and a dog gear 31 are formed on a speed change gear 43 which is supported in free revolution on the rotary shaft 44. A synchronous ring 12 is fitted in free revolution on the conical shaft part 42 of the speed change gear 43, and an adjusting ring 21 is fitted in free revolution on the shaft part 42a, and between the synchronous ring 21 and the adjusting ring 21, a leaf spring 16 is interposed. At the cut 13 on the end wall of the synchronous ring 12, the key 4 is engaged, keeping a gap, and at the cut 22 on the end wall of the adjusting ring 21, a projection 32 on the end wall of the dog gear 31 is engaged. Accordingly, the smooth meshing between the hub sleeve 2 and the dog gear 31 is secured through the engagement of each end part inclined surface between the cut 22 and the projection 32 and gears 2a and 31a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous meshing device for a transmission of a vehicle, and more particularly to spline teeth of a hub sleeve (hereinafter referred to as "spline teeth").
Here we will call the spline teeth simply teeth, but
The present invention relates to a synchronous meshing device in which the teeth of a synchronous ring, the teeth of an adjusting ring, and the teeth of a dog gear, whose rotations are restricted from one another, are meshed with each other in order to achieve smooth synchronous motion even when drag torque occurs.

[0002]

2. Description of the Related Art In a conventional synchronous meshing device, when the teeth of the hub sleeve pass through the teeth of the synchronizing ring, the friction torque between the synchronizing ring and the conical shaft portion is released, so that the teeth of the hub sleeve become the dog gear. Before the teeth are meshed with each other, the drag torque may change the arrangement of the teeth of the hub sleeve with respect to the teeth of the dog gear, which hinders smooth meshing of the two.

As a means for solving the above problems, Japanese Patent Laid-Open No.
In the 5-118346 publication, an intermediate gear similar to the dog gear is spline-supported slightly idle between the synchronizing ring and the dog gear, and an elastic body such as rubber is interposed in the circumferential gap. There is.

According to the above-mentioned synchronous meshing device, the teeth of the intermediate gear are biased by the elastic member about 1/4 pitch more than the teeth of the dog gear, and when the teeth of the hub sleeve come into contact with the teeth of the intermediate gear, they are elastic. The body flexes and is rotationally displaced to a position aligned with the teeth of the dog gear, which facilitates smooth synchronous movement of the hub sleeve. However, in the above-described synchronous meshing device, there is nothing that restricts the amount of bending of the elastic body so that the teeth of the intermediate gear do not exceed the positions aligned with the teeth of the dog gear. May collide with the teeth of the dog gear.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a hub sleeve and a synchronizing ring after completion of engagement with each other.
It is an object of the present invention to provide a synchronous meshing device in which the hub sleeve and the dog gear are not displaced even if a drag torque acts on the synchronous ring, and the both mesh smoothly.

[0006]

In order to achieve the above object, the structure of the present invention is such that a hub sleeve spline-fitted to a rotary shaft is elastically engaged with a key that is movable in the axial direction so that the hub sleeve can freely rotate. A conical shaft part, a straight shaft part and a dog gear are formed on the speed change gear supported on, and a synchronization ring is fitted to the conical shaft part and an adjustment ring is fitted to the straight shaft part so that they can freely rotate, and adjustment is made with the synchronization ring. An annular leaf spring that exerts a spring force in the axial direction is sandwiched between the rings,
The key is engaged with a notch provided in the end wall of the synchronizing ring with a circumferential gap, and a projection protruding from the end wall of the dog gear is provided in the notch provided in the end wall of the adjusting ring with a circumferential gap. Are engaged.

[0007]

Before the engagement between the hub sleeve and the synchronizing ring is completed, the friction ring made of a leaf spring rotates the adjusting ring, and the notch of the adjusting ring hits the projection of the dog gear and stops. At this time, the frictional engagement force between the conical hole of the synchronizing ring and the conical shaft of the speed change gear is released, but even if drag torque acts on the synchronizing ring, the hub sleeve and the adjusting ring do not shift, and the hub sleeve The end slopes of the teeth of the part partially contact the end slopes of the teeth of the adjusting ring to guide the smooth meshing of the two.

By the time the meshing between the hub sleeve and the adjusting ring is completed, the adjusting ring is slightly reversely rotated so that the end slopes of the teeth of the adjusting ring come into contact with the end slopes of the dog gear, so that the two mesh smoothly. Induce

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front sectional view showing a main part of a synchronous meshing device according to the present invention, and FIG. 2 is a developed plan view of the main part. In the synchromesh device, a hub sleeve 2 having teeth 2a is fitted to a known spline hub connected to a rotary shaft 44,
The boss portion 40 of the transmission gear 43, which is rotatably supported on the rotating shaft 44 by a bearing 45, has a conical shaft portion 42 and a straight shaft portion 4.
2a and the dog gear 31 are integrally formed.

The synchronizing ring 12 having the conical hole 14 is rotatably supported on the conical shaft portion 42, and the adjusting ring 21 is rotatably supported on the shaft portion 42a. A tooth 12a that can mesh with the tooth 2a of the hub sleeve 2 is a synchronous ring 12, a tooth 21a that can mesh with the tooth 2a of the hub sleeve 2 is an adjusting ring 21, and a tooth that can mesh with the tooth 2a of the hub sleeve 2. 31a is a dog gear 31
Are formed respectively. The teeth 2a of the hub sleeve 2, the teeth 12a of the synchronizing ring 12, the teeth 21a of the adjusting ring 21, and the teeth 31a of the dog gear 31 have known wedge-shaped slopes at each end. Actually, each tooth 12a, 21a
Has a very short length, so that the tip of the tooth 2a projects between the teeth 21a and 21a before the tooth 2a completely passes between the teeth 12a. Is composed of.

A central projection of a key 4 which is axially slidably supported in a key groove of a clutch hub (not shown) is elastically engaged with a groove 3 formed in the left and right central portions of the teeth 2a of the hub sleeve 2. . Engagement between the groove 3 of the tooth 2a and the protrusion of the key 4 is maintained by the expanding force of the pair of left and right annular wire springs 5, which are cut out. The key 4 is a notch 1 formed in the end wall of the synchronizing ring 12.
3, a suitable circumferential clearance s1 (FIG. 2) is provided between the key 4 and the notch 13. However, the rotation of the hub sleeve 2 may be always transmitted to the synchronizing ring 12 via the key 4.

Between the end wall of the synchronizing ring 12 and the end wall of the adjusting ring 21, a leaf spring 16 which is curved and has an annular shape is interposed, and when the synchronizing ring 12 is pushed to the right, the leaf spring is pressed. 16 transmits the rotation of the synchronizing ring 12 to the adjusting ring 21. A notch 22 formed in the end wall of the adjusting ring 21 is engaged with a protrusion 32 (FIG. 2) protruding from the end wall of the dog gear 31. An appropriate circumferential gap s2 (FIG. 3) is provided between the protrusion 32 and the notch 22.

Next, the operation of the synchronous meshing device according to the present invention will be described. When the hub sleeve 2 is in the neutral position shown in FIG. 1, the hub sleeve 2 rotates integrally with the rotating shaft 44, and the key 4 engages with the side wall 13a of the notch 13 of the synchronizing ring 12 so that the synchronizing ring 12 is not moved. Rotate in the direction.

When the hub sleeve 2 is continuously pushed to the right in order to transmit the rotation of the rotary shaft 44 to the speed change gear 43, the hub gear 2 meshes with the dog gear 31 after the following operation. As shown in FIG. 2, first, the synchronous ring 12 is pushed to the right by the key 4, and the teeth 2a of the hub sleeve 2 rotating in the direction of the arrow x are aligned with the teeth 12a of the synchronous ring 12, and the end slopes of the teeth 2a. Has teeth 1
2a is entirely contacted with the end slope (lower end slope in FIG. 2). Subsequently, the hub sleeve 2 pushes the synchronizing ring 12 to the right, so that the conical hole 14 of the synchronizing ring 12 moves into the conical shaft portion 42.
When frictionally engaged with, relative rotation occurs between the hub sleeve 2 and the synchronizing ring 12.

When the synchronizing ring 12 is frictionally engaged with the conical shaft portion 42, the key 4 is prevented from moving to the right by the synchronizing ring 12, and the key 4 resists the force of the annular wire spring 5 and the hub sleeve 2 moves. Retreat inward from the groove 3. When the key 4 is retracted, the hub sleeve 2 gets over the protrusion of the key 4 and moves to the right.

On the other hand, while the relative rotation between the hub sleeve 2 and the synchronizing ring 12 occurs in the range of the gap s1, the end slope of the tooth 2a of the hub sleeve 2 becomes the end slope of the tooth 12a of the synchronizing ring 12. Glide along. At this time, the synchronizing ring 12 is directly pushed rightward by the hub sleeve 2, and the adjusting ring 2 is pushed through the leaf spring 16.
1 exerts friction torque.

As shown in FIG. 3, when the adjusting ring 21 is rotated in the direction of the arrow x by the friction torque of the leaf spring 16, the side wall 22a of the notch 22 of the adjusting ring 21 has the projection 3 of the dog gear 31.
2, the end slope of the tooth 2a of the hub sleeve 2 is the end slope of the tooth 21a of the adjusting ring 21 (the upper end slope in FIG. 3).
Wait at a position where it will come into contact with.

Next, as the hub sleeve 2 moves to the right and the hub sleeve 2 and the adjusting ring 21 rotate relative to each other, the end slopes of the teeth 2a of the hub sleeve 2 change to the teeth 12a of the synchronizing ring 12.
Slides along the slope of the end of the tooth and the tooth 2a is tooth 12a and tooth 12a.
The teeth 2a of the hub sleeve 2 before completely passing between
3 is an end slope of the tooth 21a of the adjusting ring 21 (see FIG. 3).
Part of the upper end of the slope).

With the rightward movement of the hub sleeve 2 and the relative rotation of the hub sleeve 2 and the adjusting ring 21, the hub sleeve 2
The end slope of the tooth 2a of the adjusting ring 21 slides along the end slope of the tooth 21a of the adjusting ring 21, and the adjusting ring 21 relatively reverses in the range of the gap s2. As shown in FIG. 4, the teeth 2 of the hub sleeve 2
When a passes between the teeth 21a of the adjustment ring 21 and the teeth 21a, it advances to between the teeth 31a of the dog gear 31 and the teeth 31a, and the end slope of the teeth 2a of the hub sleeve 2 is changed to the teeth 31a of the dog gear 31. It contacts the end slope (the bottom end slope in FIG. 4).

As shown in FIG. 4, as the hub sleeve 2 moves to the right and the hub sleeve 2 and the adjusting ring 21 rotate relative to each other, the end slopes of the teeth 2a of the hub sleeve 2 are changed to the dog gear 3.
5, the hub sleeve 2 directly meshes with the dog gear 31 and the rotation of the rotary shaft 44 is transmitted to the transmission gear 43 via the hub sleeve 2 as shown in FIG. .

In the conventional synchronous meshing device, the hub sleeve 2
When the tooth 2a of is completely meshed with the tooth 12a of the synchronizing ring 12,
The frictional engagement force between the synchronizing ring 12 and the conical shaft portion 42 is released, and the teeth of the hub sleeve 2 and the dog gear 31 as well as a large deviation are likely to occur. However, in the present invention, the teeth 2 of the hub sleeve 2 are
The tooth 2a of the hub sleeve 2 partially meshes with the tooth 21a of the adjusting ring 21 before a completely meshes with the tooth 12a of the synchronizing ring 12, and the dog gear 31 causes the relative rotation of the adjusting ring 21 to fall within the range of the gap s2. Hub sleeve 2 because it is limited to
The tooth of the dog gear 31 and the large deviation do not occur.

[0022]

As described above, the present invention elastically engages a key that is movable in the axial direction with a hub sleeve that is spline-fitted to a rotary shaft, and a conical shaft portion is attached to a speed change gear that is rotatably supported on the rotary shaft. A straight ring and dog gear are formed, a conical shaft is fitted with a synchronizing ring and a straight shaft is fitted with an adjusting ring in a freely rotatable manner, and an axial spring force is applied between the synchronizing ring and the adjusting ring. The key is engaged with a notch provided in the end wall of the synchronizing ring with a circumferential gap, and the notch provided in the end wall of the adjusting ring projects from the end wall of the dog gear. When the hub sleeve passes through the synchronous ring, even if the frictional engagement force between the synchronous ring and the conical shaft is released, the rotation of the synchronous ring is a leaf spring. It is transmitted to the adjusting ring via the sliding friction plate consisting of and is adjusted by the engagement of the notch of the adjusting ring and the protrusion of the dog gear. Since synchronous operation with the dog gear is reached and, hub sleeve passes through the adjustment ring, will be meshed without unreasonable dog gear, the impact is less smooth synchronous operation is obtained.

[Brief description of drawings]

FIG. 1 is a front sectional view of a synchromesh device according to the present invention.

FIG. 2 is a developed plan view showing the operation of the synchromesh device.

FIG. 3 is a developed plan view showing the operation of the synchromesh device.

FIG. 4 is a developed plan view showing the operation of the synchromesh device.

FIG. 5 is a developed plan view showing the operation of the synchromesh device.

[Explanation of symbols]

2: Hub sleeve 2a: Tooth 3: Groove 4: Key 5:
Wire spring 12: Synchronous ring 12a: Tooth 13: Notch 14: Conical hole 16: Leaf spring 21: Adjusting ring 21a: Tooth 22: Notch 31: Dog gear 31a: Tooth 32: Protrusion 42: Conical shaft 42: Shaft 43 : Speed change gear 44: Rotating shaft

Claims (2)

[Claims] 1. A hub gear fitted to a rotary shaft by a spline is elastically engaged with a key that is movable in the axial direction, and a speed change gear supported rotatably on the rotary shaft includes a conical shaft portion, a straight shaft portion, and a dog gear. The ring is formed by fitting the synchronizing ring to the conical shaft and the adjusting ring to the straight shaft so that they can freely rotate, and sandwiching an annular leaf spring that exerts an axial spring force between the synchronizing ring and the adjusting ring. , The key is engaged in a notch provided in the end wall of the synchronizing ring with a circumferential gap, and the protrusion protruding from the end wall of the dog gear is provided in the notch provided in the end wall of the adjusting ring with a circumferential gap. A synchronous meshing device characterized by being engaged with each other. 2. The synchronizing ring, the adjusting ring, and the dog gear are provided with teeth that mesh with the teeth of the spline of the hub sleeve, and each end of each tooth forms a sloped surface so that the hub sleeve does not completely mesh with the synchronizing ring. , The adjustment ring is rotated so that the side wall of the notch of the adjustment ring hits the protrusion of the dog gear, and the sloped end of the tooth of the hub sleeve partially comes into surface contact with the sloped end of the tooth of the adjustment ring. 2. The synchronous meshing device according to claim 1, wherein the toothed end slope of the hub sleeve makes surface contact with the toothed end slope of the dog gear when passing through the adjusting ring.