| 摘要 |
Pressure converter for hydraulic brakes, particularly for brakes of a tractor. The converter comprises a body (10), a piston device (15) reciprocating in the borings of the body, a primary compartment (24), and a secondary compartment (27). The area of the cross-section of the piston in the primary compartment (24) is essentially larger than the area of the cross-section of the piston in the secondary compartment (27). The primary pressure (p1) is conducted to the primary compartment from the brake system master cylinder, and the amplified secondary pressure is conducted from the secondary compartment to the wheel cylinders. In order to avoid a too high secondary pressure for instance in steering brake operation, and in order to make it possible to use a high conversion ratio, the pressure converter is equipped with a pressure-limiting organ (25, 26, 27), by means of which the secondary pressure is limited according to the highest maximum allowed secondary pressure. The conversion ratio (A<u1>u/A<u2>u) of the pressure converter is also selected high enough to essentially provide the maximum allowed secondary pressure with primary pressures available in normal brakings. |
