Technical field
The present invention relates to a kind of device that cuts off self-lock, particularly can be applied to the device that cuts off self-lock that aircraft pod etc. requires optional position self-locking.
Background technology
In order to realize the aircraft pod device that cuts off self-lock at an arbitrary position, need to use gear.Driving gear and axle system are connected, and driven gear is connected with the device that cuts off self-lock.Aircraft pod is especially when aircraft commutates, and due to inertia, gondola internal components still can continue to rotate along a certain axle, and particularly eccentric structure is rotated more obviously, and it is spacing that device can hit the limit with its framework that is connected.Often clash into and can reduce device service life, particularly high precision device, also can affect survey precision, even damage device, thereby affected the normal work of whole system.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of device that cuts off self-lock at an arbitrary position, it can be under powering-off state, and optional position locking prevents that framework from hitting the limit spacing, therefore can not affect device survey precision, also can not damage device.
The present invention solves the technical scheme that its technical matters takes: housing is fixed on framework, and housing is fixed on magnet coil on housing by bearing, and axle cap is connected by pin and rotating shaft, and the friction disc empty set coordinating with axle cap is in rotating shaft.In rotating shaft, cover has retracing spring, and the lower end of retracing spring is located by the shoulder of rotating shaft, and upper end withstands on the lower end of friction disc, and when without external force, friction disc contacts with axle cap, and axle cap can not be rotated
When switching on to magnet coil, housing produces magnetic-adsorption friction disc, makes friction disc depart from axle cap; After power-off, friction disc contacts with axle cap by spring force, and friction disc is all processed with identical groove with axle cap contact surface, after contact, by groove, is meshed and can be reached self-locking effect.
The present invention has following advantages: power-off at any time, self-locking at any time, can not affect device precision and service life.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is cutaway view of the present invention.
The specific embodiment
As shown in Figure 1, the present invention includes
magnet coil 1, rotating
shaft 2,
axle cap 3,
friction disc 4,
housing 5,
pilot hole 6, retracing
spring 7, back-up ring 8,
guide finger 10, back-up
ring 11,
pin 12, bearing 13.
Housing 5 is fixed on
framework 9, and
housing 9 is fixed on
magnet coil 1 on
housing 5 by bearing 13, and
axle cap 3 is connected by
pin 12 and rotating
shaft 2, and
friction disc 4 empty sets that coordinate with
axle cap 3 are in rotating shaft 2.In rotating
shaft 2, cover has retracing
spring 7, and the lower end of retracing
spring 7 is located by the shoulder of rotating
shaft 2, and upper end withstands on the lower end of
friction disc 4, and when without external force,
friction disc 4 contacts with
axle cap 3, and
axle cap 3 can not be rotated.
The lower end of the
fixing guide finger 10 parallel with rotating
shaft 2 on described
housing 5, the upper gap ground of
guide finger 10 inserts in the
pilot hole 6 of
friction disc 4, and
friction disc 4 can only, along
guide finger 10 translations, can not be rotated.
In described rotating
shaft 2, have feather key (not shown in FIG.),
friction disc 4 is enclosed within on the feather key of rotating
shaft 2, and
friction disc 4 can only, along
guide finger 10 translations, can not be rotated.
When giving
magnet coil 1 energising, the magnetic-
adsorption friction disc 4 of generation, makes
friction disc 4 depart from
axle cap 3; After power-off,
friction disc 4 contacts with
axle cap 3 by retracing
spring 7, and
friction disc 4 is all processed with identical groove with
axle cap 3 contact surfaces, after contact, by groove, is meshed and can be reached self-locking effect.