Vehicle-body inclination device and double-layer three-way valve used in vehicle-body inclination device

摘要

A carriage-body inclination device (30) has individual inclination units (112, 113) that are provided corresponding to air springs (22, 23), and a control unit (110). The individual inclination unit (112) can sufficiently execute supply or release of air to or from the air spring (22) by driving a control valve (40) and a large-capacity valve (170) using a height difference value which is a difference between a height instruction value provided by the control unit (110) and a height value obtained from a link-lever mechanism (24). The control valve (40) has a two-layer structure of a fixed sleeve (91), a control sleeve (90), and a spool (80). The control sleeve (90) is moved and driven by the link-lever mechanism (24) and a rotation-translation conversion mechanism (44). The spool (80) is moved and driven by a spool actuator (120) according to a set height value.

主权项

1. A carriage-body inclination device that supplies gas to or releases the gas from an air spring placed between a carriage body of a carriage and a dolly, to extend or contract the air spring and to change a height value which is a height between the carriage body and the dolly, the carriage-body inclination device comprising:
a two-layer three-way valve including a spool that has a small-size stem and a large-size land, a fixed sleeve that has a supply port connected to a gas supply source, a release port, and a load port connected to the air spring, and a control sleeve that is slidably supported on the fixed sleeve on an outer circumferential side, that slidably supports the spool on an inner circumferential side, that has a load hole corresponding at least to the land of the spool, that can be moved relative to the fixed sleeve within a predetermined movement range which is defined in advance, and in which the load hole is in a range of the load port of the fixed sleeve in the predetermined movement range, and wherein an amount of flow of gas supplied from the supply port via the load port to the air spring is determined or an amount of flow of gas released from the air spring via the load port, and through the release port is determined based on a relative positional relationship between the land of the spool and the load hole of the control sleeve; a spool actuator that moves and drives the spool in an axial direction with respect to the fixed sleeve of the two-layer three-way valve according to a set height value which is a setting value for the height value; and a sleeve actuator that moves and drives the control sleeve in an axial direction with respect to the spool of the two-layer three-way valve according to a height difference value which is a difference between the set height value and an actual height value.