Cooling device for forklift brake system

Patent metadata

Field	Value
Publication number	US-10850960-B2
Application number	US-201516060041-A
Country	US
Kind code	B2
Filing date	Dec 8, 2015
Priority date	Dec 8, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

The present invention is related to a cooling device for a forklift brake system, which is capable of maintaining a predetermined level of heat-radiation performance by reducing heat when heat is generated in a service brake that is provided at a forklift driving shaft. A cooling device for a forklift brake system according to an exemplary embodiment of the present invention allows cooling oil to bypass a cooler when a pressure of the cooling oil is abnormally increased or there is a concern that a pressure of the cooling oil is increased, thereby preventing the cooler from being damaged.

First claim

The invention claimed is:

1. A cooling device for a forklift brake system, the cooling device comprising:
an oil tank in which cooling oil is stored;
a hydraulic pump which sucks and discharges the cooling oil;
a cooler which cools the discharged cooling oil;
a service brake which is cooled by the cooled cooling oil and allows the used cooling oil to be returned to the oil tank;
a first bypass line which connects a front end of the service brake and a rear end of the service brake;
a check valve which is installed on the first bypass line, and is opened when an abnormal pressure is generated at the front end of the service brake and allows the cooled cooling oil to bypass the service brake;
a third bypass line which connects a front end of the cooler and a rear end of the cooler;
a thermostat valve which is installed on the third bypass line, and is maintained in a closed state when a temperature of the cooling oil discharged from the hydraulic pump is higher than a setting temperature and is opened when the temperature of the cooling oil discharged from the hydraulic pump is lower than the setting temperature to allow the cooling oil to bypass the cooler;
a temperature sensor which detects a temperature of the cooling oil at a front end of the thermostat valve; and
a controller which is configured to receive the temperature value of the cooling oil detected by the temperature sensor, and control a dashboard to display an abnormal temperature when the received temperature value deviates from an allowable temperature range.

2. The cooling device of claim 1 , further comprising:
a second bypass line which is connected from a front end of the cooler 13 to the oil tank; and
a relief valve which is installed on the second bypass line and is set with a pressure allowable by the cooler.

3. The cooling device of claim 1 ,
wherein the controller is configured to receive the temperature value of the cooling oil detected by the temperature sensor, and to control a buzzer to output a warning sound when the received temperature value deviates from an allowable temperature range.

4. The cooling device of claim 1 ,
wherein the controller is configured to receive the temperature value of the cooling oil detected by the temperature sensor, and to control a transmission controller to decrease a speed of a vehicle when the received temperature value deviates from an allowable temperature range.

5. A cooling device for a forklift brake system, the cooling device comprising:
an oil tank in which cooling oil is stored;
a hydraulic pump which sucks and discharges the cooling oil;
a cooler which cools the discharged cooling oil;
a service brake which is cooled by the cooled cooling oil and allows the used cooling oil to be returned to the oil tank;
a first bypass line which connects a front end of the service brake and a rear end of the service brake;
a check valve which is installed on the first bypass line, and is opened when an abnormal pressure is generated at the front end of the service brake and allows the cooled cooling oil to bypass the service brake;
a third bypass line which connects a front end of the cooler and a rear end of the cooler;
a hydraulic valve which is installed on the third bypass line and is opened and closed;
a temperature sensor which detects a temperature of the cooling oil at a front end of the hydraulic valve; and
a controller which is configured to receive the temperature value of the cooling oil detected by the temperature sensor, and to control the hydraulic valve to be maintained in a closed state when the temperature value is higher than a setting temperature and controls the hydraulic valve to be opened when the temperature value is lower than the setting temperature.

6. The cooling device of claim 5 , wherein when the temperature value of the cooling oil deviates from an allowable temperature range, the controller controls a dashboard to display an abnormal temperature.

7. The cooling device of claim 5 , wherein when the temperature value of the cooling oil deviates from an allowable temperature range, the controller controls a buzzer to output a warning sound.

8. The cooling device of claim 5 , wherein when the temperature value of the cooling oil deviates from an allowable temperature range, the controller controls the transmission controller to decrease a speed of a vehicle.

Assignees

• Doosan Corp

Inventors

• Han Dong Ho

Classifications

• B60T17/222

  by filling or bleeding of hydraulic systems · CPC title

• B60T17/02

  Arrangements of pumps or compressors, or control devices therefor · CPC title

• B66F17/003

  for fork-lift trucks · CPC title

• B66F9/07509

  Braking · CPC title

• F16D65/813

  with closed cooling system · CPC title