초록 ▼

A work brake apparatus for a wheel type excavator having a travelling device, a suspension device, and a service brake device. The work brake apparatus comprises: a first means, which is connected to the forward/backward lever of the travelling device, for unlocking the suspension device as the susp

A work brake apparatus for a wheel type excavator having a travelling device, a suspension device, and a service brake device. The work brake apparatus comprises: a first means, which is connected to the forward/backward lever of the travelling device, for unlocking the suspension device as the suspension locking solenoid valve switches over in response to a predetermined signal when the forward/backward lever switches over to its forward or backward position, and a second means, which is connected to the forward/backward lever of the travelling device, for keeping the service brake applied as the service brake valve switches over in response to a predetermined pilot pressure when the forward/backward lever switches over to its neutral position.

대표청구항 ▼

[ What is claimed is:] [1.] A work brake apparatus for a wheel type excavator having a travelling device in which a travelling motor is provided, the travelling motor being driven by applying a predetermined pilot pressure to a main control valve as a forward/backward solenoid valve switches over in

[ What is claimed is:] [1.] A work brake apparatus for a wheel type excavator having a travelling device in which a travelling motor is provided, the travelling motor being driven by applying a predetermined pilot pressure to a main control valve as a forward/backward solenoid valve switches over in response to a predetermined signal selected by a forward/backward lever; a suspension device in which a suspension locking cylinder is provided, the suspension locking cylinder being driven by applying a pilot pressure to a suspension locking valve as a suspension locking solenoid valve switches over in response to a predetermined signal; and a service brake device in which a service brake cylinder is provided, the service brake cylinder being driven by supplying the oil from a cut-off valve thereto as a service brake valve switches over in response to a predetermined signal, the work brake apparatus comprising:a first means, which is connected to the forward/backward lever of said travelling device, for unlocking the suspension device as said suspension locking solenoid valve switches over in response to a predetermined signal when the forward/backward lever switches over to its forward or backward position, anda second means, which is connected to the forward/backward lever of said travelling device, for keeping the service brake applied as said service brake valve switches over in response to a predetermined pilot pressure when the forward/backward lever switches over to its neutral position.