Synchronizer ring

Details Synchronizer ring Synchronizer ring

1998-04-30

2001-07-17

Kastler, Scott (Department: 1742)

Metal treatment

Stock

Ferrous

C192S10700R, C420S089000, C420S099000

Reexamination Certificate

active

06261389

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a synchronizer ring used in the synchronizer of a speed change gear, especially to a synchronizer ring made of Fe sintered alloy superior in strength and abrasion resisting property.
DESCRIPTION OF THE PRIOR ART
In speed change gears for changing a speed in gearing, a synchronizer has been employed to synchronize the circumferential speeds of mating gears when the gears are engaged, because unless one of the mating gears synchronizes with the other one in their circumferential speed, noises will occur in a speed change and occasionally the gears could be damaged.
An example of such a synchronizer is shown in
FIG. 2
, in which the center line of rotation is indicated by one-point dotted line.
At first, when a shift lever (not shown) is moved, a rotating sleeve
2
moves in a direction shown by arrow S, whereby a synchronizer key
3
abuts against a synchronizer ring
4
to push the ring. Then the inner tapered peripheral surface
40
of the synchronizer ring
4
is forcedly engaged against a cone portion
50
of a clutch gear
5
as its mating member, which generates frictional force to rotate the clutch gear
5
. Further movement of the sleeve
2
in the arrow direction (S) causes &ore frictional force thereby to Rake the rotation of the sleeve
2
essentially equal to that of the clutch gear
5
in their circumferential speeds. In a condition that the synchronization has been completed and therefore there is no relative speed difference between the sleeve
2
and the clutch gear
5
, when the sleeve
2
is forced to move in the arrow direction (S), spline
21
of the sleeve
2
engages a spline chaffer
51
of the clutch gear
5
thereby to complete the speed change.
As shown in
FIG. 1
, the synchronizer ring
4
is provided, at the outer peripheral surface thereof, with a synchronizer chamfer
41
to engage with the spline
21
of the sleeve
2
, and is fomed, at the inner tapered peripheral surface thereof, with top lands
42
of mutual concave-convex shape which will effect frictional force to attain the synchronization. Normally, in order to bear up against the friction at contact, the synchronizer ring
4
is made of brass series metal or bronze series metal.
On the other hand, in recent smaller light weight synchronizers, to attain the synchronization, contact face-pressure increases which occurs between the gear cone portion and the top lands formed on the inner tapered peripheral surface of the synchronizer ring, which results in severe wears at the respective members.
To solve these problems, for the purpose of hardening the top lands which may be easily worn out, some measures have been tried, such as sprayed layer of Mo. Al—Si and so forth or resin coating applied on the inner tapered peripheral surface of the synchronizer ring. Also, in order to heighten the strength, some measures such as sinter forging or the like have been tried, whereas these measures each are accompanied with drawbacks of high costs.
SUMMARY OF THE INVENTION
An object of the invention is to solve advantageously the above mentioned problems and therefore to provide a synchronizer ring superior in abrasion resisting property with a high strength.
To attain the object, according to the present invention, a synchronizer ring is provided which is used in the synchronizer of a speed change gear, characterized in that said synchronizer ring is consisted of, by weight, C:0.2~1.0%, Ni:1.0~6.0%, Mo:0.6~3.0%, Cu:1.0~4. 0% and the reminder Fe and inevitable impurities, and is wade of Fe sintered alloy of which base composition comprises of mainly martensite and bainite.
Also, according to the invention, a synchronizer ring is provided which is used in the synchronizer of a speed change gear, characterized in that said synchronizer ring is consisted of, by weight, C:0.2~1.0%, Ni:1.0~6.0%, Mo:0.6~3.0%, Cu:1.0~4.0% and the reminder Fe and inevitable impurities, and is applied one forming treatment and one sintering treatment, and further is made of Fe sintered alloy of which base composition comprises of mainly martensito and bainite.
Furthermore, according to the invention, said base composition is preferably comprised of, by volume, martensite: 57~80%, bainite:17~40% and austenite:8% or less.


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