# US 6,719,082 B2 · Device for preventing wheel lock of vehicle

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- Number: US 6,719,082 B2
- Document ID: US6719082B2
- Status: Granted
- Kind: B2
- Application number: 09/948,339
- Filed: 2001-09-07
- Published: 2002-03-21
- Granted: 2004-04-13
- Earliest claimed: 2000-09-12
- Assignees: Komatsu Ltd.
- Inventors: Koji Uematsu; Nobuki Hasegawa
- Web page: https://patentgrep.com/patent/US6719082B2

## CPC

- B60K 23/0808: {for varying torque distribution between driven axles, e.g. by transfer clutch}
- B60K 17/3462: {with means for changing distribution of torque between front and rear wheels}
- B60T 2201/14: Electronic locking-differential
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES

## Abstract

In a vehicle in which an engine output power is transmitted to front and rear wheels through a transmission and an inter axle differential, a wheel lock prevention device is provided. The wheel lock prevention device comprises a differential lock mechanism for locking the inter axle differential, a detection element for detecting a wheel lock state of the front and rear wheels, and an operation element for operating the differential lock mechanism so as to lock the inter axle differential by operating the differential lock mechanism upon the detection of the wheel lock state.

## Claims

### Claim 1

A device for preventing wheel lock of a vehicle in which an engine output power is transmitted to front and rear wheels of the vehicle through a transmission and an inter axle differential, said device comprising:
a differential lock mechanism for locking said inter axle differential;
means for detecting a wheel lock state of the front and rear wheels during a braking operation of respective front and rear wheel brakes; and
means for operating the differential lock mechanism so as to lock the inter axle differential by operating the differential lock mechanism upon the detection of the wheel lock state during the braking operation;
wherein said wheel lock detection means is operated to detect the wheel lock state in a case where a relative revolution number difference between a transmission output revolution number and a differential revolution number in a braking state of the respective front and rear wheel brakes is more than a set revolution number, and
wherein said differential lock mechanism operating means comprises a differential lock valve that discharges pressurized oil to the differential lock mechanism, and said differential lock valve is operated upon the detection of the wheel lock state during the braking operation to thereby discharge the pressurized oil.

### Claim 2

A device for preventing wheel lock of a vehicle in which an engine output power is transmitted to front and rear wheels of the vehicle through a transmission and an inter axle differential, said device comprising:
a differential lock mechanism for locking said inter axle differential;
means for detecting a wheel lock state of the front and rear wheels during a braking operation of respective front and rear wheel brakes; and
means for operating the differential lock mechanism so as to lock the inter axle differential by operating the differential lock mechanism upon the detection of the wheel lock state during the braking operation;
wherein said wheel lock detection means is operated to detect the wheel lock state in a case where a relative revolution number difference between a transmission output revolution number and a differential revolution number in a braking state of the respective front and rear wheel brakes is more than a set revolution number;
wherein said differential lock mechanism operating means comprises a differential lock valve that discharges pressurized oil to the differential lock mechanism, and said differential lock valve is operated upon the detection of the wheel lock state during the braking operation to thereby discharge the pressurized oil;
wherein said wheel lock detection means stores a plurality of set revolution numbers and is operated to generate a wheel lock signal in accordance with the wheel lock state upon the detection of the wheel lock state during the braking operation in a case where said relative revolution number difference is more than each of said set revolution numbers stored in the wheel lock detection means, and
wherein the pressurized oil discharged by said differential lock valve has a pressure in accordance with the detected wheel lock signal so as to create a differential lock state in accordance with the wheel lock state.