Speed changer for vehicles used in construction work
A speed changer is described for changing a speed change gear of a tractor shovel comprising: a first speed solenoid valve means for actuating a first speed clutch adapted to be connected to the speed change gear; a second speed solenoid valve for actuating a second speed clutch adapted to be connected to the speed change gear; a switch unit, the unit including a first speed switch operably connected to the first speed solenoid valve for activating and deactivating the first speed solenoid valve; a relay connected between the second speed switch and the second speed solenoid valve, having an A contact and a B contact; a changeover switch operably connected to the interlocking switch and the relay, the changeover switch to energize the relay when the changeover switch is closed and operable to deenergize the relay when the changeover switch is open; whereby the forward speed of a tractor shovel can be changed from a second speed to a first speed by closing a single changeover switch even though the second speed switch of the switch unit is closed and the first speed switch unit is open.
- Assignee:
- Toyo Unpanki Co., Ltd.
- Patent Number(s):
- US 4610178
- OSTI ID:
- 5165453
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONSTRUCTION INDUSTRY
CONTROL EQUIPMENT
CONTROL SYSTEMS
EARTHMOVING EQUIPMENT
ELECTRIC COILS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
GEARS
INDUSTRY
MACHINE PARTS
MATERIALS HANDLING EQUIPMENT
MECHANICAL TRANSMISSIONS
RELAYS
SOLENOIDS
SPEED REGULATORS
SWITCHES
TRUCKS
VALVES
VEHICLES
VELOCITY