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|  MIL-C-18087A(SH)
3.5.1.1 Oil filling. Filling of clutches shall be accomplished by admitting
oil through manifolds or through a bore in the input or output shaft, as specified
(see 6.2). Filling and dumping valves shall be provided. The valve controls
shall be arranged so that when one valve is closed, the other is open. Valve
actuation may be by electrical, pneumatic, or hydraulic operation. In addition,
valves shall incorporate provision for manual operation in case of emergency. The
time for clutch filling and dumping shall be as specified (see 6.2).
3.5.1.2 Oil circulation. Hydraulic clutches shall be provided with leakoff
ports, fixed scoop tubes, or sliding scoop tubes for circulation of oil. Sliding
scoop tubes shall be actuated hydraulically or pneumatically, as specified (see
6.2). In addition, provision shall be made for manual operation in case of
emergency.
3.5.1.2.1 Slip. Unless otherwise specified (see 6.2), the percentage of
slip shall not exceed 3 percent.
3.6 Type II nonpositive drive friction cl utch (tire and tube).
3.6.1 Construction. Nonpositive drive friction clutches (tire and tube)
shall consist of rubber tires and tubes that, when inflated with air, will engage
the surface of a cast or fabricated steel drum, or will actuate the engagement of
friction discs. For radial engagement with a steel drum, the interfacing surfaces
of the tires and tubes shall be faced with a friction material as specified (see
6.2). Pneumatic clutches incorporating a rubber tire and tube shall be of the dry
friction type. Clutches shall be arranged for either radial or axial (drum or
disc) engagement. Material for discs and drums shall be as specified in table I.
3.6.1.1 Tires and tubes. Rubber tires and tubes may be thermally bonded to
the driving ring or secured thereto by pins or snap rings. Rubber tires and tubes
designed for axial engagement need not be bonded if retained inside a suitable
housing. Each tire and tube shall be provided with a vulcanized air valve as an
integral part of the tire and tube. The tires and tubes shall be in accordance
with MIL-HDBK-149. The body of the tire and tube shall be constructed of multiple
plies of tire cord fabric reinforcement thoroughly impregnated with rubber
friction compound, laminated and integrated by vulcanization. The inner tube and
cover shall consist of rubber layers vulcanized to the body.
3.6.1.2 Friction linings. Friction linings shall be of a heat-resistant,
non-asbestos composition. Linings shall be one of the following types:
(a)
Secured to their disc cores by riveting or thermal bonding.
(b)
Thermally bonded to rubber tires and tubes.
(c)
Secured to tires and tubes by pins.
(d)
Of the floating plate type.
(e)
Radially arranged as independent shoe and plate units positioned by
driving bars.
Friction lining material shall not emit poisonous gases.
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