Speed changer for vehicles used in construction work

Patent · Tue Sep 09 00:00:00 EDT 1986

OSTI ID:5165453

Kameshita, R

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
• Resource Relation: Patent File Date: Filed date 27 Jun 1984
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
MECHANICAL TRANSMISSIONS
CONTROL SYSTEMS
TRUCKS
SPEED REGULATORS
CONSTRUCTION INDUSTRY
EARTHMOVING EQUIPMENT
GEARS
RELAYS
SOLENOIDS
SWITCHES
VALVES
VELOCITY
CONTROL EQUIPMENT
ELECTRIC COILS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
INDUSTRY
MACHINE PARTS
MATERIALS HANDLING EQUIPMENT
VEHICLES
330602* - Vehicle Design Factors- Engine-Transmission Matching