Brakes – Vehicle – Hub or disk
Patent
1980-03-13
1982-08-24
Butler, Douglas C.
Brakes
Vehicle
Hub or disk
188363, B60T 106, F16D 5100
Patent
active
043456731
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Technical Field
This invention relates to a wheel brake arrangement for motivating a brake shoe into contact with a brake drum and for retaining the shoe in contacting relation with a housing of the wheel arrangement.
Background Art
There are a number of wheel brake arrangements which have a brake drum adjacent one end of a housing and at least one radially expandable brake shoe intermediate the housing and the drum. A wheel cylinder acts responsive to fluid pressure to motivate the shoe into frictional braking engagement with the drum.
In such prior art arrangements as described above, a backing plate is provided for the brake shoes, with the backing plate being connected to the housing. The wheel cylinder is attached to a side of the backing plate removed from the housing. Hydraulic lines extend from outside of the housing, pass over the backing plate, and are connected to the wheel cylinder. Thus, the lines are exposed outside of the frame and are subject to damage and leakage due to the compound bend angles necessary. Further, such lines are difficult to assemble to the wheel cylinder due to lack of space, particularly when a wheel gear is mounted on a hub or spindle within the housing. In addition, the backing plates are formed by an additional metal working step which adds to the overall expense of the integrated wheel brake arrangement.
Prior art backing plates are held against the brake shoes by spring retainers which include a pin having an enlarged end thereof positioned through a hole in the backing plate, with the large end of the pin being too large to pass through the hole. The pin is biased between the brake shoe and the backing plate so that the large end of the pin bears against the backing plate in a manner to produce a force which biases the brake shoe into contact with the backing plate. Such a spring retainer arrangement works well, but is difficult to assemble. That is, during assembly the pin can fall through the hole in the backing plate (which hole is large enough to admit all parts of the pin except for the enlarged end thereof). This is clearly undesirable and can lead to wasted time during assembly. Further, if the backing plate can be eliminated, thus saving expense and allowing elimination of exposed and easily damaged pressurized lines, a problem arises of providing a retainer for holding the brake shoes against the housing. The prior art does not attack such a problem.
The wheel cylinders of the prior art are generally mounted flatly against the backing plate. In such structures the wheel cylinder can be attached to the housing. If a backing plate is eliminated to save cost and eliminate potential damage to exposed pressurized lines, obtaining proper assembly of the wheel cylinder to the housing introduces yet another new problem not contemplated by the prior art.
The present invention is directed to overcoming one or more of the problems as set forth above.
Disclosure of Invention
In one aspect of the present invention, an improved wheel brake arrangement is provided having a frame, a housing adjacent the frame, a rotating member adjacent one end of the housing, at least one friction member intermediate the housing and the rotating member, and means for fluid pressurized motivating of the friction member into frictional engagement with the rotating member. The improvement of the arrangement comprises means for mounting the motivating means directly to the one end of the housing, at least one passage defined within the housing, means for connecting the passage with the motivating means and means for rigidly connecting the housing to the frame.
In another aspect of the present invention, the improvement in the wheel brake arrangement comprises means for rigidly connecting the housing to the frame and means for axially biasing the friction member into contacting relation with the one end of the housing.
It will be noted that a backing plate is completely eliminated in all aspects of the improvement and the pressurized fluid is introduced to the motivating
REFERENCES:
patent: 2796954 (1957-06-01), Kaiser
patent: 2801713 (1957-08-01), Trahern, Jr.
patent: 3548976 (1970-12-01), Dombeck
patent: 3779348 (1973-12-01), Farr
patent: 3980347 (1976-09-01), Griesenbrock
Callaghan William I.
Ehinger Charles P.
Butler Douglas C.
Towmotor Corporation
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