JPH0681856A - Synchronizing device for gear transmission - Google Patents

Abstract

PURPOSE:To prevent an oil film from being broken in internal/external peripheries of a middle ring by arranging a spacer, integrally rotated with an outer or inner ring to further restrict moving in an axial direction of the middle ring, between a clutch hub and the middle ring, in a synchronizing device for a gear transmission of an automobile. CONSTITUTION:A spacer 30 is arranged between a clutch hub 21 and an outer ring 27, middle ring 28 and an inner ring 29. This spacer 30 is rotatably fitted to the periphery of a boss part 21a of the clutch hub 21 and constituted of an annular plate part 30a supported in a diametric direction and a protrusion 30b extended by a specified length respectively in diametric and axial directions. The protrusion 30b is integrally rotated with the outer ring 27 and the inner ring 29, by engaging a rotational direction end part with an engaging protrusion 27b of the outer ring 27 in the direction of rotation, and restricted in axial direction moving of the protrusion 30b by engaging its axial direction end part with the middle ring 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizing device used in a gear transmission of a vehicle such as an automobile.

[0002]

2. Description of the Related Art As one of synchronizers for a gear transmission, as disclosed in, for example, Japanese Utility Model Laid-Open No. 34833/1990, a shaft between a clutch hub and a gear mounted on a shaft so as to be rotatable relative to each other. An outer ring and an inner ring are arranged to connect the both rings to the clutch hub so as to be integrally rotatable, and a middle ring is arranged between the both rings to be integrally rotatable to the gear,
There is one in which three taper cone clutches are formed between these three rings and the gear.

[0003]

In the synchronizer of the above publication, the shaft rotates because the gear and the middle ring are free from the outer ring and the inner ring that rotate integrally with the clutch hub during rotation. If it fluctuates, the gear and the middle ring may cause a combined change in the radial and axial movements, and this fluctuation of the middle ring may cause an oil film shortage on the inner circumference and the outer circumference of the middle ring. The present invention has been made to address the above-described problems, and an object thereof is to suppress fluctuations in the middle ring and prevent oil film breakage on the inner and outer circumferences of the middle ring.

[0004]

In order to achieve the above object, in the present invention, an outer ring and an inner ring are arranged between a clutch hub and a gear which are mounted on a shaft so as to be rotatable relative to each other. While connecting both of these rings to the clutch hub so that they can rotate together,
In a synchronizer for a gear transmission, wherein a middle ring is arranged between the two rings and is connected to the gear so as to rotate integrally with each other, and three taper cone clutches are formed between the three rings and the gear. An engaging portion that engages with the outer ring or the inner ring is provided between the hub and the middle ring to rotate integrally with the outer ring and the inner ring, and also to engage with the middle ring in the axial direction. A spacer having a portion for restricting the axial movement of the middle ring is arranged.

[0005]

In the synchronizing device of the gear transmission according to the present invention, the rotation of the shaft of the gear and the middle ring, which are free from the outer ring and the inner ring that rotate integrally with the clutch hub during rotation, occurs. However, since the spacers placed between the clutch hub and the middle ring restrict the movement of the middle ring in the axial direction, fluctuations in the middle ring are suppressed. This prevents the oil film from running off on the inner and outer circumferences of the middle ring. Therefore, seizure on the inner and outer circumferences of the middle ring can be prevented, shift defects can be improved, and the durability of the synchronizer can be improved.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a synchronizer for a gear transmission according to the present invention, which comprises a shaft 10
A clutch hub 21 that is spline-coupled to the upper side to rotate integrally, a gear 22 that is rotatably mounted on the shaft 10 via a bearing 11 and is rotatable relative to the clutch hub 21, and a clutch hub 21. The assembled key spring 23, index key 24 and hub sleeve 25, the spline piece 26 integrally assembled to the gear 22, and the outer that is arranged between the clutch hub 21 and the gear 22 to form three tapered cone clutches. Ring 2
7, a middle ring 28 and an inner ring 29.

As shown in FIGS. 1 and 2, the outer ring 27 has teeth on one outer circumference and a tapered cone portion on the inner circumference, and a recess 27 formed on the outer circumference of the other end.
a in the clutch hub 21 via the index key 24
And is connected to the clutch hub 21 so as to be integrally rotatable. As shown in FIG. 1, the middle ring 28 has a tapered cone portion on the outer and inner circumferences, and an engaging claw portion 28a formed on the large diameter side and extending in the axial direction (the lubricating oil flows at the tip. Is formed in the groove 26a of the spline piece 26 in the axial direction, and the spline piece 26, that is, the gear 2 is engaged with the groove 26a.
It is connected to 2 so as to be integrally rotatable. Inner ring 29
As shown in FIGS. 1 and 2, the outer ring 27 has a tapered cone portion on the outer and inner circumferences, and an engaging claw portion 29a formed on the small diameter side and extending in the axial direction and having a predetermined length.
Engages with an engagement protrusion 27b formed on the other end of the outer ring 27 toward the inner circumference, and the outer ring 27 and the index key 24 are
It is connected to the clutch hub 21 via the so as to be integrally rotatable.

Further, in the present embodiment, a spacer 30 is arranged between the clutch hub 21, the outer ring 27, the middle ring 28 and the inner ring 29. As shown in FIGS. 1 and 2, the spacer 30 includes an annular plate portion 30a rotatably fitted to the outer periphery of the boss portion 21a of the clutch hub 21 and supported in the radial direction, and the annular plate portion 30a.
Is formed integrally with the outer periphery of the projection 30b and extends in the radial direction outward and axially by a predetermined length, respectively, and the rotation direction end of the projection 30b functions as an engaging portion, and the engaging protrusion of the outer ring 27. 27b engages with the outer ring 27 and the inner ring 29 in the rotational direction, and the axial end of the protrusion 30b functions as a locking portion to face the middle ring 28 in the axial direction. The axial movement of the middle ring 28 is restricted.

In the gear transmission synchronizing device configured as described above, the gears that are free from the outer ring 27 and the inner ring 29 that rotate integrally via the clutch hub 21 and the index key 24 during rotation. Two
2. The spline piece 26 and the middle ring 28 try to make a combined change in the radial direction and the axial direction according to the change in the rotation of the shaft 10, but the spacer arranged between the clutch hub 21 and the rings 27, 28, 29. Since the axial movement of the middle ring 28 is restricted by 30, the fluctuation of the middle ring 28 is suppressed, and the oil film is prevented from running off on the inner circumference and the outer circumference of the middle ring 28. Therefore, it is possible to prevent seizure on the inner and outer circumferences of the middle ring 28, improve shift defects, and improve the durability of the synchronizer. The outer ring 27 and the inner ring 29 are engaged with the clutch hub 21 rotated by the shaft 10 via the index key 24 and rotate integrally with each other. 29 also fluctuates. However, even if the outer ring 27 fluctuates, its axial movement is restricted by the clutch hub 21 via the key spring 23,
Even if the inner ring 29 fluctuates, its axial movement is restricted by the clutch hub 21 by the engaging claws 29a.

FIGS. 3 and 4 show a second embodiment of the gear transmission synchronizing device according to the present invention. In this embodiment, an annular plate portion is used as a spacer for restricting the axial movement of the middle ring 28. A spacer 130 having a short radial length of 130a is adopted. The spacer 130 is formed integrally with the annular plate portion 130a radially supported by the inner peripheral portion of the engaging claw portion 29a of the inner ring 29 and the outer periphery of the annular plate portion 130a so as to extend radially outward and axially. Each of which is formed with a protrusion 130b extending a predetermined length, and which is rotationally engaged with the second engaging protrusion 29b of the inner ring 29 by a radial groove 130c formed in the protrusion 130b. It rotates integrally with the ring 29, and axially opposes the middle ring 28 at the end of the protrusion 130b in the axial direction to restrict the movement of the middle ring 28 in the axial direction. Since the other structure of this embodiment is substantially the same as that of the first embodiment, the same reference numerals are given and the description thereof is omitted.

In the synchronizer of the second embodiment, it is of course possible to obtain the same effect as the effect shown in the first embodiment, and the spacer 30 and the outer member in the first embodiment are also obtained. Since the second engagement protrusion 29b of the inner ring 29 is engaged with the radial groove 130c of the protrusion 130b of the spacer 130 on the inner peripheral side of the engagement position of the ring 27, the load applied to the spacer 130 can be reduced. Together with the annular plate portion 130a of the spacer 130
Since the length in the radial direction is shorter than that in the first embodiment, the lubricating oil passage can be enlarged and the lubricity can be improved, and the seizure resistance in each taper cone clutch is higher than that in the first embodiment. Can be improved. Further, since the spacer 130 is supported in the radial direction by the inner circumferential portion of the inner ring 29, the radial vibration of the clutch hub 21 is not directly received, and damage due to contact with the clutch hub 21 can be prevented. it can.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of a synchronizer for a gear transmission according to the present invention.

FIG. 2 is a front view of an outer ring, a middle ring and an inner ring shown in FIG.

FIG. 3 is a vertical sectional side view showing a second embodiment of the synchronizer for a gear transmission according to the present invention.

FIG. 4 is a front view of the outer ring, the middle ring, and the inner ring shown in FIG.

[Explanation of symbols]

10 ... Shaft, 21 ... Clutch hub, 22 ... Gear, 2
3 ... Key spring, 24 ... Index key, 25 ...
Hub sleeve, 26 ... Spline piece, 27 ... Outer ring, 28 ... Middle ring, 29 ... Inner ring, 3
0 ... Spacer, 30b ... Protrusion.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideaki Koga 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (3)

[Claims] 1. An outer ring and an inner ring are arranged between a clutch hub and a gear, which are mounted on a shaft so as to be rotatable relative to each other, and these both rings are integrally rotatably connected to the clutch hub. A synchronizing device for a gear transmission, wherein a middle ring is arranged between the rings and is integrally rotatably connected to the gears, and three taper cone clutches are formed between the three rings and the gears. An engaging portion that engages with the outer ring or the inner ring is provided between the middle rings to rotate integrally with the outer ring and the inner ring, and a locking portion that axially opposes the middle ring is provided. A synchronizer for a gear transmission, further comprising a spacer arranged to restrict axial movement of the middle ring. 2. The gear transmission according to claim 1, wherein a spacer having an engaging portion with the outer ring and radially supported by a boss portion of the clutch hub is used as the spacer. Synchronizer. 3. The gear shift according to claim 1, wherein a spacer having an engaging portion with the inner ring and radially supported by an inner peripheral portion of the inner ring is used as the spacer. Machine synchronization device.