Electrically-controlled speed change valve of bulldozer

• Main Authors: WEI HAIYUN, LIU CUNBO, JIN KE, LI XIAOXIANG, JIANG YOUSHAN, LIU XU, GAO SHENG
• Format: Patent
• Language: Chinese; English
• Published: 04.12.2013
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

The utility model relates to an electrically-controlled speed change valve of a bulldozer. The speed change valve comprises an electromagnetic valve A, an electromagnetic valve B, an oil cylinder A, an oil cylinder B, a pressure regulating valve, a quick return valve, a gear reversing valve and a direction reversing valve, wherein a hydraulic pump is sequentially communicated with the electromagnetic valve A and the oil cylinder A through an oil path A, an oil path C is sequentially communicated with the electromagnetic valve B and the oil cylinder B, and the pressure regulating valve, the quick return valve, the gear reversing valve and the direction reversing valve are sequentially communicated through an oil path B; the gear reversing valve comprises a first gear, a second gear, a third gear and a valve core A, the direction reversing valve comprises a forward gear, a reverse gear, a neutral gear and a valve core B, a cylinder rod A of the oil cylinder A is connected with the valve core A of the gear rever