Tube-pressed brake

Details Tube-pressed brake Tube-pressed brake

1999-09-29

2002-01-29

Oberleitner, Robert J. (Department: 3613)

Brakes

Wheel

Transversely movable

C188S366000, C192S083000

Reexamination Certificate

active

06341675

ABSTRACT:

BACKGROUND OF THE INVENTION
a) Field of the Invention
This invention relates to a tube-pressed brake suitable for use in a clutch, a brake or the like.
b) Description of the Related Art
Conventional tube-pressed brakes are each constructed of an outer frame, a tube arranged inside the outer frame, and a counterpart arranged inside the tube and rotatable relative to the tube. A pressure fluid is injected into the tube upon transmission of a torque, and is discharged upon allowing the brake to idle.
FIG. 5
is a cross-sectional view showing a conventional tube-pressed brake as viewed from a front, and
FIG. 6
is a diagram illustrating an example of a fluid pressure circuit for the conventional tube-pressed brake. In these drawings, an outer frame
20
, a pressure fluid supply hole
21
, and a tube
30
are depicted. The tube
30
is folded back along opposite ends of the outer frame
20
, between which a cut-off portion
23
is formed. The tube
30
is sealed and fixed at folded portions
31
thereof on the outer frame
20
by presser plates
40
and rivets
41
, respectively.
Designated at numeral
32
are springs inserted within the tube
30
. These springs
32
urge the tube
30
outwardly such that, during idling with the pressure fluid discharged from the tube
30
, the tube
30
is prevented from contacting a brake drum (not shown) arranged inside the tube
30
.
As is understood from the circuit diagram of
FIG. 6
, the pressure fluid is delivered by a pump
52
from a reservoir
53
to the pressure fluid supply hole
21
of the tube
30
via a solenoid-operated valve
60
through a line
50
. Numeral
55
indicates a pressure control circuit which includes a relief valve
54
. Upon transmission of a torque, the pressure fluid is delivered to the tube
30
via the solenoid-operated valve
60
. Upon idling, on the other hand, the solenoid-operated valve
60
is changed over (into the position depicted in
FIG. 6
) such that the pressure fluid flows in an opposite direction through the line
50
and returns to the reservoir
53
.
There is an important demand for providing clutch elements or brake elements with improved heat resistance and durability. A tube-pressed brake of the above-described conventional construction is unable to release heat produced during transmission of a torque, so that a friction surface of a tube and a counterpart, such as a drum, become hot. This leads to the occurrence of a problem in durability and also to the development of an inconvenience that the heat resistance has to be heightened.
SUMMARY OF THE INVENTION
To meet the above-described demand, the present invention provides a tube-pressed brake having a tube, said tube being inflatable by injection of a pressure fluid thereinto such that a torque can be transmitted to a counterpart, comprising a pressure fluid circuit for circulating said pressure fluid through an interior of said tube.
According to the present invention, the pressure fluid is allowed to circulate through the interior of the tube of the tube-pressed brake. This has made it possible to release heat, which is produced during transmission of a torque, to the outside of the brake. As a consequence, it has become possible to improve the durability of the tube and its counterpart, such as a drum, and hence to prolong their service life.


REFERENCES:
patent: 2952276 (1960-09-01), Warman
patent: 3450242 (1969-06-01), Heidrich
patent: 3631943 (1972-01-01), Roob
patent: 4411347 (1983-10-01), Bednar
patent: 5020649 (1991-06-01), Eastcott
patent: 5086899 (1992-02-01), Latsko
patent: 5178248 (1993-01-01), Latsko
patent: 5366055 (1994-11-01), Pudelski et al.
patent: 35-26215 (1960-10-01), None

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