JPH084784A - Synchronous meshing device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of large dislocation in dentition of a hub sleeve and a dog gear even if dragging torque acts on a synchronous ring after the hub sleeve and the synchronous ring mesh with each other. CONSTITUTION:A hub sleeve 2 having an internal tooth 2a and an external tooth 2b of a spline on inner and outer peripheral surfaces is fitted to a rotary shaft 44 by the spline. A key 4 elastically engaged with the hub sleeve 2 so as to be movable in the shaft direction is engaged with a notch 13 arranged on an end wall of a synchronous ring 12 by securing a circumferential directional clearance. A cylinder part 41 is formed on an end wall of a speed change gear 43 supported with the rotary shaft 44 so as to be idly rotatable, and a conical shaft part 42 and a dog gear 31 are formed in a boss part 43a, respectively. An adjusting ring 21 fittable to the external tooth 2b is fitted to an inner peripheral surface of the cylinder part 41, and the synchronous ring 12 fittable to the internal tooth 2a is fitted to the conical shaft part 42, respectively so as to be idly rotatable. An annular elastic friction plate is sandwiched between an end wall of the hub sleeve 2 and an end wall of the adjusting ring 21, and a projection projecting from an inner end wall of the cylinder part 41 is engaged with a notch 22 arranged on the end wall of the adjusting ring 21 by securing a circumferential directional clearance.

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 in a transmission such as a vehicle, and more particularly to spline teeth of a hub sleeve (hereinafter, the spline teeth will be simply referred to as teeth).
A gear meshing device that sequentially meshes with the teeth of the synchronous ring whose rotation is limited, the teeth of the adjusting ring, and the teeth of the dog gear that is integral with the speed change gear, and realizes a smooth synchronous operation even if drag torque occurs in the synchronous ring. It is about.

[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 mesh with the teeth, the tooth alignment of the hub sleeve and the dog gear may change due to the drag torque, and smooth meshing of the two may be hindered.

As a technique for solving the above problems, Japanese Patent Laid-Open No.
In the 5-118346 publication, an intermediate gear similar to a dog gear is spline-supported at a boss portion between a synchronizing ring and a dog gear so as to be slightly idle, and an elastic body such as rubber is interposed in a circumferential gap. I am wearing.

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-mentioned synchronous meshing device, there is no one that regulates 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.
Also, when the intermediate gear is arranged, the axial length of the boss portion increases,
The transmission becomes long.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the object of the present invention is to prevent the axial length of the boss portion from increasing and even if drag torque acts on the synchronizing ring after the engagement of the hub sleeve and the synchronizing ring is completed. SUMMARY OF THE INVENTION It is an object of the present invention to provide a synchronous meshing device in which teeth of a hub sleeve and a dog gear and large deviations do not occur, and both are smoothly meshed.

[0006]

In order to achieve the above object, according to the present invention, a hub sleeve having internal and external spline teeth on its inner and outer peripheral surfaces is fitted to a rotary shaft, and the hub sleeve is provided with a shaft. A cylindrical portion is formed on the end wall of the speed change gear, which is elastically engaged with a directionally movable key, and is supported rotatably on the rotating shaft, and a conical shaft portion and a dog gear are formed on the boss portion. An adjustment ring that can be fitted to the outer teeth is fitted to the surface, and a synchronization ring that can be fitted to the inner teeth is fitted to the conical shaft portion so as to be free to rotate, and an end wall of the hub sleeve and an end wall of the adjustment ring are formed. A ring-shaped elastic friction plate is sandwiched in between, and a protrusion protruding from the inner end wall of the cylindrical portion is engaged with a notch provided in the end wall of the adjusting ring with a circumferential gap, and is provided on the end wall of the synchronizing ring. The key is engaged with the notch with a circumferential gap.

[0007]

[Function] When the hub sleeve meshes with the synchronizing ring, if the end slopes of the inner teeth of the hub sleeve come into surface contact with the end slopes of the teeth of the synchronizing ring, the rotation of the hub sleeve is adjusted with elastic friction plates with a slight delay. It is transmitted to the ring, and the notch of the adjusting ring hits the protrusion of the transmission gear.

The synchronizing ring slides and frictionally engages with the conical shaft portion of the transmission gear, and the hub sleeve meshes with the synchronizing ring. At this time, even if the frictional engagement force between the synchronizing ring and the conical shaft portion of the transmission gear is released and drag torque acts on the synchronizing ring, the engagement between the notch of the adjusting ring and the protrusion of the transmission gear causes the hub sleeve and the synchronizing ring to engage. Limit the misalignment of teeth.

By the time the meshing of the hub sleeve and the synchronizing ring is completed, the end slopes of the outer teeth of the hub sleeve are in surface contact with the end slopes of the teeth of the adjusting ring. When the engagement between the hub sleeve and the adjusting ring starts, the end slopes of the inner teeth of the hub sleeve come into surface contact with the end slopes of the teeth of the dog gear.

When the hub sleeve is completely meshed with the adjusting ring, the adjusting ring is slightly reversely rotated, and the hub sleeve is guided to directly mesh with the dog gear to realize a smooth meshing between the two.

[0011]

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 outer teeth 2b and inner teeth 2a of the spline is fitted to a known spline hub (not shown) connected to the rotary shaft 44, while the rotary shaft 44 is mounted with a bearing 45 so as to play. The conical shaft portion 42 and the dog gear 31 are integrally formed on the boss portion 43a of the speed change gear 43 rotatably supported, and the cylindrical portion 41 is formed on the end wall of the speed change gear 43.

The synchronizing ring 12 having the conical hole 14 is rotatably supported by the conical shaft portion 42. Inner teeth 2 of hub sleeve 2
The tooth 12a capable of meshing with a is on the synchronizing ring 12, and the tooth 31a capable of meshing with the inner tooth 2a of the hub sleeve 2 is a dog gear 31.
Are formed respectively. An adjusting ring 21 having a flange or an end wall 24 is allowed to freely rotate on the cylindrical portion 41, and the retaining ring 2
It is supported so as not to come off by 3. The adjustment ring 21 is formed with teeth 21b that can mesh with the outer teeth 2b of the hub sleeve 2.

Inner teeth 2a and outer teeth 2b of the hub sleeve 2
A tooth 12a of the synchronizing ring 12 and a tooth 21b of the adjusting ring 21.
The teeth 31a of the dog gear 31 are formed with known wedge-shaped slopes at each end. In the neutral position of the hub sleeve 2 shown in FIG. 1, the axial play between the outer teeth 2b of the hub sleeve 2 and the teeth 21b of the adjusting ring 21 is the inner teeth 2a of the hub sleeve 2 and the teeth 12a of the synchronizing ring 12. Larger than the axial play.

A key 4 is axially slidably supported in a key groove of a clutch hub (not shown), and a protrusion at the central portion of the key 4 is formed in a groove 3 formed in the left and right central portions of the inner teeth 2a of the hub sleeve 2. Is elastically engaged with. The groove 3 of the inner tooth 2a and the protrusion of the key 4 are engaged with each other by a pair of left and right annular wire springs 5 which are cut out.
It is maintained by the expansion force of. The end of the key 4 is a synchronization ring 12
Engaged with the notch 13 formed in the end wall of the key 4 and the notch 1
An appropriate circumferential gap s1 (FIG. 2) is provided between the two.

Between the end wall of the hub sleeve 2 and the end wall 24 of the adjusting ring 21, an elastic friction plate 16 composed of a corrugated annular leaf spring is interposed, and the hub sleeve 2 is pushed to the right. Then, the elastic friction plate 16 transmits the rotation of the hub sleeve 2 to the adjusting ring 21. The notch 22 formed in the end wall of the adjusting ring 21 is engaged with the protrusion 32 (FIG. 2) protruding from the end wall of the cylindrical portion 41 of the transmission gear 43. A suitable circumferential gap s2 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 (FIG. 2) of the notch 13 of the synchronizing ring 12 to synchronize with the rotating shaft 44. Rotate the ring 12 in the same 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 sleeve 2 meshes with the dog gear 31 after the following operation. As shown in FIG. 2, first, the synchronizing ring 12 is pushed to the right by the key 4, and the inner teeth 2a of the hub sleeve 2 rotating in the direction of arrow x are aligned with the teeth 12a of the synchronizing ring 12 and the ends of the inner teeth 2a. The partial slope entirely contacts the end slope of the tooth 12a (the lower end slope in FIG. 2). Subsequently, when the hub sleeve 2 pushes the synchronizing ring 12 to the right and the conical hole 14 of the synchronizing ring 12 slides and frictionally engages with the conical shaft portion 42, relative rotation occurs between the hub sleeve 2 and the synchronizing ring 12. .

When the synchronizing ring 12 frictionally engages 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. After retreating from the groove 3 inward inward, the hub sleeve 2 goes over the projection of the key 4 and advances to the right.

At this time, the hub sleeve 2 is replaced by the elastic friction plate 16
Is directly pushed to the right to exert a friction torque on the adjusting ring 21.
As shown in FIG. 3, when the adjusting ring 21 is rotated in the arrow x direction by the friction torque of the elastic friction plate 16, the side wall 22 a of the cutout 22 of the adjusting ring 21 contacts the protrusion 32 of the transmission gear 43. Due to the sliding frictional engagement between the synchronizing ring 12 and the conical shaft portion 42,
The inner teeth 2a of the hub sleeve 2 mesh with the teeth 12a of the synchronizing ring 12 while the relative rotation between the hub sleeve 2 and the synchronizing ring 12 occurs within the gap s1.

Subsequently, the end slopes of the outer teeth 2b of the hub sleeve 2 come into surface contact with the end slopes of the teeth 21b of the adjusting ring 21. The end slope of the outer tooth 2b of the hub sleeve 2 is adjusted by the adjustment ring 2
Since the adjusting ring 21 can relatively rotate only by the gap s2 between the notch 22 and the protrusion 32 when it comes into surface contact with the end slope of the first tooth 21b,
The hub sleeve 2 is not blocked from moving.

When the hub sleeve 2 completely meshes with the synchronizing ring 12, the frictional engagement force between the conical hole 14 of the synchronizing ring 12 and the conical shaft portion 42 of the transmission gear 43 is released. At this time, even if drag torque acts on the synchronizing ring 12, the notch 2 of the adjusting ring 21
Engagement of the projection 32 of the speed change gear 43 with the gear 2 limits the alignment of the synchronous ring 12 and the dog gear 31 with each other.

As shown in FIG. 4, when the hub sleeve 2 meshes with the adjusting ring 21, the end slopes of the inner teeth 2a of the hub sleeve 2 come into surface contact with the end slopes of the teeth 31a of the dog gear 31. Be induced. Due to the rightward movement of the hub sleeve 2 and the relative reverse rotation of the adjusting ring 21 with respect to the transmission gear 43 integrated with the dog gear 31, the end slope of the inner tooth 2a of the hub sleeve 2 causes the end of the tooth 31a of the dog gear 31 to move. The hub sleeve 2 directly meshes with the dog gear 31, and the rotation of the rotating shaft 44 is transmitted to the transmission gear 43 via the hub sleeve 2 after sliding along the inclined surface.

[0023]

As described above, according to the present invention, the hub sleeve having the inner and outer teeth of the spline on the inner and outer peripheral surfaces is fitted to the rotating shaft and the hub sleeve is elastically engaged with the axially movable key. Then, a cylindrical portion is formed on the end wall of the speed change gear that is rotatably supported on the rotating shaft, and a conical shaft portion and a dog gear are formed on the boss portion,
An adjusting ring that can be fitted to the outer teeth on the inner peripheral surface of the cylindrical portion,
Synchronous rings, which can be fitted to the inner teeth, are respectively fitted to the conical shafts in a freely rotatable manner, and an annular elastic friction plate is sandwiched between the end wall of the hub sleeve and the end wall of the adjustment ring. A projection protruding from the inner end wall of the cylindrical portion is engaged with a notch provided in the wall with a circumferential gap, and the key is engaged with the notch provided in the end wall of the synchronizing ring with the circumferential gap. When the hub sleeve meshes with the synchronizing ring, the frictional engagement force between the synchronizing ring and the conical shaft is released, and the rotation of the hub sleeve is adjusted via the elastic friction plate even if drag torque is received. It is transmitted to the ring, and the notch of the adjusting ring and the projection of the speed change gear engage with each other to limit the misalignment of the tooth alignment between the synchronizing ring and the dog gear, so that the inner teeth of the hub sleeve mesh with the dog gear without difficulty. , Smooth synchronous operation with less impact can be obtained.

Since the synchronizing ring and the adjusting ring are arranged in parallel, the boss portion of the transmission gear does not become long and the stroke of the synchronizing operation does not become long.

[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.

[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: Elastic friction plate 21: Adjustment ring 21b: Teeth 22: Notch 31: Dog gear 31a: Teeth 32: Protrusion 42: Conical shaft portion 43: Speed change gear 44: Rotation shaft

Claims (2)

[Claims] 1. A hub sleeve having inner and outer teeth of splines on its inner and outer peripheral surfaces is fitted to a rotating shaft, and an axially movable key is elastically engaged with the hub sleeve so that the hub sleeve can freely rotate. A cylindrical portion is formed on the end wall of the speed change gear supported on the boss portion, a conical shaft portion and a dog gear are formed on the boss portion, and an adjusting ring that can be fitted to the outer teeth is formed on the inner peripheral surface of the cylindrical portion. And a synchronous ring that can be fitted to the inner teeth are fitted in a freely rotatable manner, and an annular elastic friction plate is sandwiched between the end wall of the hub sleeve and the end wall of the adjustment ring, and the ring is provided on the end wall of the adjustment ring. The projection protruding from the inner end wall of the cylindrical portion is engaged with the notch with a circumferential gap, and the key is engaged with the notch provided on the end wall of the synchronizing ring with the circumferential gap. Synchronous meshing device. 2. An inner peripheral surface of the adjusting ring is provided with teeth that mesh with the outer teeth of the hub sleeve, and a synchronous ring and a dog gear are provided with teeth that mesh with the inner teeth of the hub sleeve, respectively. The adjustment ring is rotated by the hub sleeve through the elastic friction plate before the hub sleeve is completely engaged with the synchronizing ring, and the notch of the adjustment ring contacts the protrusion of the cylindrical portion.
When the end bevels of the outer teeth of the hub sleeve partially come into surface contact with the bevels of the teeth of the adjusting ring, the end bevels of the inner teeth of the hub sleeve come into surface contact with the bevels of the dog gear teeth. 2. The synchromesh device according to claim 1, which guides to.