Hydraulic circuit for traveling
First Claim
1. A brake system for a traveling vehicle having at least two traveling wheels driven by a single hydraulic pump through respective hydraulic motors, comprising:
- a parking brake for applying braking force to all of said at least two traveling wheels when the hydraulic pump is not driven or the hydraulic pump does not provide sufficient hydraulic pressure to the hydraulic motors;
at least two auxiliary brakes, each auxiliary brake applying braking force to only one of the traveling wheels independently of the parking brake, the braking force being provided directly to a rotational portion of the corresponding hydraulic motor;
at least two rotation detectors, each rotation detector detecting rotational speeds of the respective traveling wheels; and
a computer connected to the rotation detectors for comparing the rotational speeds of the traveling wheels, wherein the computer controls one of the auxiliary brakes to apply a braking force selectively to the corresponding traveling wheel based on a result of the comparison.
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Accused Products
Abstract
If a hydraulic motor (23) (traveling wheel (27)) is rotated (or skidding) at high rate, and a hydraulic motor (24) is hardly rotated, a detection controller (68) compares the rotational speeds of both hydraulic motors (23, 24). Then the rotation detected by the rotation detectors (66, 67) to detect the traveling wheel (27) to be skidding, and moves a piston (71) to allow a negative brake (40) to give a braking force to the hydraulic motor (23), and rotate the hydraulic motor (24). In this way, this invention can release the traveling wheel from skidding without the use of a flow dividing valve.
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Citations
13 Claims
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1. A brake system for a traveling vehicle having at least two traveling wheels driven by a single hydraulic pump through respective hydraulic motors, comprising:
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a parking brake for applying braking force to all of said at least two traveling wheels when the hydraulic pump is not driven or the hydraulic pump does not provide sufficient hydraulic pressure to the hydraulic motors;
at least two auxiliary brakes, each auxiliary brake applying braking force to only one of the traveling wheels independently of the parking brake, the braking force being provided directly to a rotational portion of the corresponding hydraulic motor;
at least two rotation detectors, each rotation detector detecting rotational speeds of the respective traveling wheels; and
a computer connected to the rotation detectors for comparing the rotational speeds of the traveling wheels, wherein the computer controls one of the auxiliary brakes to apply a braking force selectively to the corresponding traveling wheel based on a result of the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification