192 clutches and power-stop control – Clutch and brake – Vehicle type
Patent
1988-02-26
1989-05-23
Braun, Leslie A.
192 clutches and power-stop control
Clutch and brake
Vehicle type
192 18R, 192103R, 192105BA, F16D 6702
Patent
active
048321656
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a clutch brake, utilized particularly for an asynchronous heavy duty transmission, and especially to a clutch brake having a brake assembly connectable to a rotatable shaft and a cover assembly providing an external friction surface, supported rotatably relatively to the brake assembly.
BACKGROUND ART
With regard to this kind of clutch brake, the applicant of the present invention has heretofor developed a clutch brake, as illustrated in FIG. 6, and has applied for a patent (Japanese application No.: 61-46786, Date of application: Mar. 4, 1986 corresponding U.S. patent application Ser. No. 021,066, filed Mar. 3, 1987, now U.S. Pat. No. 4,782,926, dated Nov. 8, 1988).
In such prior clutch brake, a coned disc spring 100 is interposed between a cover assembly C and a brake assembly B so as to improve the torque characteristic produced by the brake assembly B. However, even though an inertial torque working on an output shaft (connecting to a transmission equipped with no synchro mechanism) increases with an increase in a rotation speed, a brake torque can not be increased with an increase in the rotation speed.
Further, the engagement action at time of increased rotation speed is done abruptly, so that facings 110 will be worn out quickly.
DISCLOSURE OF INVENTION
An object of the invention is to provide a clutch brake which can increase braking torque with an increase in a rotation speed and reduce wear of the friction facings.
This invention relates to a clutch brake having a brake assembly connectable to a rotatable shaft with accompanied driving action and a cover assembly providing external friction surfaces and supported rotatably relatively to the brake assembly; characterized by that a hub flange composing said brake assembly and connected to an output shaft is installed between two approximately disc-like cover elements facing each other and composing the cover assembly, recessed opening toward the radial outsides of the hub flange are formed on an outer peripheral part of the hub flange, centrifugal segments are urged by centrifugal force toward the radial outsides of the hub flange and are installed in the recessed openings and spring members for generating an initial torque, and which press the centrifugal segments against a sliding contact surface of the cover assembly facing an outer peripheral surfaces of the centrifugal segments, are interposed between the centrifugal segments and the hub flange.
The spring force of the spring member presses the centrifugal segment against the sliding contact surface of the cover assembly to generate the initial torque.
When the rotation speed increases, the outer peripheral surface of the centrifugal segment contat, slidingly, with the sliding contact surface by means of the centrifugal force acting on the centrifugal segment and generate friction torque. This friction torque is added to the initial torque to multiply the torque characteristic.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a sectional view taken on a line I--I of FIG. 2 showing an embodiment of the invention.
FIG. 2 is a partially cut-away front view.
FIGS. 2a and 2b are views of a portion of the apparatus of FIG. 2 but showing modified spring arrangements.
FIG. 2c is a view of a portion of the apparatus of FIG. 2 but showing a modified recession arrangement.
FIG. 3 is a graph showing the relation between the friction member wear amount and torque characteristic.
FIG. 4 is a graph showing the relation between the rotation speed and the torque characteristic.
FIG. 5 is a vertical sectional schematic view showing a so-called pull type clutch for use in the clutch brake according to the present invention.
FIG. 6 is a partially cut-away schematic side view showing the clutch brake of our earlier application.
BEST MODE FOR CARRYING OUT THE INVENTION
In FIG. 1 showing the clutch brake according to the present invention, 10 is an approximately annular hub which fits onto an output shaft 3 (only its center line being shown) and rotates together with the
REFERENCES:
patent: 4043437 (1977-08-01), Taylor
patent: 4369616 (1983-01-01), Cody et al.
Asada Masaaki
Nishimura Yoshio
Braun Leslie A.
Kabushiki Kaisha Daikin Seisakusho
Pitts Andrea
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