Kubota Corporation

Akira Takashima

Masahiko Kobayashi

Shizuo Shimoie

Tadashi Kusunoki

Masahiro Ishizaki

Hisato Katoh

Takafumi Wada

Backhoe

A hydraulic circuit for a backhoe comprising a first multiple valve, a second multiple valve, and a confluence mechanism mounted between the first and second multiple valves. The first multiple valve includes control valves connected to a first pump in parallel to one another for driving working implements. The second multiple valve includes further control valves connected to a second pump in parallel to one another for driving other working implements. The confluence mechanism is connected to a rear end of a center bypass line of the first multiple valve and to a rear end of a center bypass line of the second multiple valve. Further, the confluence mechanism, in neutral position, is connected to a return oil line for confluently returning oil from the first and second multiple valves to a tank.

Hydraulic circuit for a backhoe

A backhoe vehicle comprising an engine and a driver's seat disposed rearwardly of an oil passage defining rotary joint of a swivel platform rotatably mounted through bearings on a stationary support of a chassis, a swivel guide gear attached to the stationary support, a swivel pinion meshed with the swivel guide gear, a motor for driving the swivel pinion to rotate the swivel platform, and traveling control valves and backhoe control valves mounted in a control box disposed on the swivel platform forwardly of the rotary joint. The motor is disposed below the traveling control valves and the backhoe control valves. The backhoe vehicle further comprises a driver's deck having a bent configuration with step portions thereof disposed laterally of the rotary joint being at a lower level than a cover portion disposed over the rotary joint.

Backhoe vehicle

A backhoe vehicle comprising an upper carriage including a driver's section and swivellable 360 degrees on a chassis, and an excavating assembly including a boom, a bucket arm and a bucket. The boom defines a first and a second bent portions so that a distal end of the boom is inclined in a direction in which the boom is lowered. An excavating assembly holder is attached to a front region of the upper carriage and adjacent a transversely mid-position of the vehicle to be pivotable on a vertical axis. The boom is connected to the holder to be pivotable on a horizontal rotary shaft. A boom cylinder for causing pivotal movements of the excavating assembly is connected at one end to the boom and at the other end selectively to a first and a second pivot members defined on the holder. The second pivot member is disposed at a lower rearward position with respect to the first pivot member. The first bent portion is defined substantially at a longitudinally mid-position of the boom, and the second bent portion is defined between the first bent portion and the rotary shaft. A distance between the rotary shaft and the second bent portion is substantially equal to a distance between the rotary shaft and the first pivot member.

Complete swivel type backhoe vehicle

Growing community of inventors

Sakai, Japan

Akira Takashima