Brakes – Position adjusters – Slack
Patent
1988-06-21
1989-05-09
Butler, Douglas C.
Brakes
Position adjusters
Slack
188 718, 188 7345, 188 7951, 188161, 188171, 188 721, F16D 6552
Patent
active
048280780
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a disk or drum brake wherein the gap between the disk or drum and the brake lining, that is, the electromagnet stroke, can be adjusted automatically to within the rated value.
BACKGROUND ART
The electromagnet stroke in a disk brake generally is small, in the order of 0.7 to 1.0 mm. Therefore, when the brake lining or the like wears, increasing the electromagnet stroke, shocks and vibration will increase during braking, in addition to which unless adjustment is carried out the electromagnetic induction may become inoperative and slipping arise between the disk and the lining, causing the lining to wear rapidly and generating heat in the disk, which can result in a major accident.
Devices have been proposed, e. g., by Japanese Patent Publication No. 59(1984)-16130, for automatically correcting for an increase in the gap between the disk and the brake lining so that the gap is always maintained within the specified range. This type of device comprises a lever that is used to magnify the small movement of the armature of the electromagnet that operates the brake lining to thereby move, by one tooth at a time, a ratchet wheel that is integral with an adjusting screw for adjusting the brake lining gap.
Because a conventional device of this type employs a system of magnifying the amount of wear by means of a lever, it is necessary to use many pins and lever holes. Therefore, wear produced in the pins and lever holes gives rise to accumulated error, as a result of which a long working life with high reliability cannot hope to be achieved.
From a consideration of the aforementioned problems, an objective of the present invention is to achieve a long working life with high reliability.
DISCLOSURE OF INVENTION
In order to achieve this objective, the automatic gap-adjusting brake according to the present invention comprises, in a brake device which applies braking force by clamping a rotating member such as a brake disc or brake drum between a primary and a secondary brake lining, the provision of a means comprising one end of a detector rod affixed to the electromagnet armature which drives the primary brake lining of the said brake device, a detection member having a stepped portion on its side surface affixed to the other end of the detector rod, a lever which is rotatably attached to a fixing base to which the said secondary brake lining is affixed, a detection piece having a stepped portion which engages with the stepped portion on the said detection member is affixed to the end of the said lever, a switch which detects the movement of the said lever when the stepped portion of the said detection member is engaged with the stepped portion of the said detection piece when the electromagnet stroke increases owing to wear of the brake lining or the like, whereby the operation of the said switch causes the stroke of said secondary brake lining to approach the specified stroke on the primary brake lining side.
In accordance with this invention, when the brake lining wears and the armature electromagnet stroke increases, and the stepped portion of the detection member comes into engagement with the stepped portion of the detection piece, the end of the lever turns to describe a stroke that is the same as the depth of the stepped portion. The movement of the lever at this point is made to operate a switch to move the ratchet by one tooth to adjust automatically the brake lining gap.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front, sectional view of an embodiment of the present invention;
FIGS. 2 and 3 are left and right side views, respectively;
FIG. 4 is a plan view thereof;
FIG. 5 is a front view of the gap detecting portion;
FIG. 6 is a plan view of the portion shown in FIG. 5;
FIG. 7 is a side view through the line A--A of FIG. 5;
FIGS. 8a and 8b are plan views of the operating states;
FIGS. 9(a), 9(b), 9(c) and 9(d) are perspective views of the various parts; and
FIG. 10 is an electrical circuit diagram of the electromagnet coil and the microswitch.
B
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patent: 4156478 (1979-05-01), Kroeger
patent: 4181201 (1980-01-01), McCarthy
patent: 4226307 (1980-10-01), Dorot
patent: 4228874 (1980-10-01), Brinkmann et al.
patent: 4718523 (1988-01-01), Rudolf et al.
Butler Douglas C.
Murakami Seiki Mfg. Co. Ltd.
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