| 摘要 |
1,156,015. Fluid-pressure brakes. DUNLOP CO. Ltd. 11 Aug., 1966 [24 Aug., 1965], No. 36195/65. Heading F2F. A rotary-inertia skid-sensing device for an anti-skid braking system comprises a driving shaft 8 which drives a flywheel 18 through a torque-sensitive coupling consisting of a helical spring 42 arranged within a sleeve 24 secured to the flywheel and extending into a sleeve 21 rotatable independently of both the flywheel and the shaft, the sleeve 21 being coupled to the shaft 8 by a transverse pin 37 passing through openings 38 in a hollow end portion of the shaft which are larger than the diameter of the pin, and the lower end of the sleeve 21 having cam faces 34 engaged with cam faces 33 of an actuating member in the form of a coaxial sleeve 28 which is slidable on splines of the hollow end portion of the shaft 8 so as to rotate with the shaft. A helical tension spring 36 is connected between the second sleeve 28 and the pin 37 such as to act as a torsion spring as well as urging the two sleeves together so that, when the flywheel overruns the shaft as a result of rapid deceleration, relative rotation of the two sleeves is resisted both by the friction between the cam forces 33, 34 caused by the tension in spring 36 and by the torsional force exerted by spring 36. When both these are overcome, the resulting camming action between the faces 33, 34 causes axial movement of the second sleeve 28 which causes it to engage the button 43 of a micro-switch controlling a valve in the fluid circuit of the brakes, or alternatively actuate the valve direct, so as to reduce braking of the associated vehicle wheels. The torsional force exerted by the spring 36 is variable by providing the sleeve 28 with a rotatable end cap 35 to which the adjacent end of the spring is secured, the cap being provided with a flange 44 having a pair of ears 45, 46 which can be bent to engage a series of notches in the sleeve to lock the cap in its adjusted position. The shaft 8 is driven by a gear-wheel 9 engageable with a gear-wheel of the vehicle transmission, the gear-wheel 9 being connected with the shaft 8 so as to provide a predetermined amount of backlash, either by the peg 12 shown which engages a slot in the gear-wheel or by any of the other arrangements described in Specification 1,156,014 which is referred to. |
