Travel vibration suppressing device for working vehicle
AssigneeKomatsu Ltd.
InventorsNorihide Mizoguchi, Hisashi Asada, Daisuke Kozuka, Kazunori Ikei, Shuuji Hori
Life of this patent
Estimating the term…
Abstract
A travel vibration suppressing device 20 is structured such that a directional control valve 30 for a bucket, a directional control valve 29 for a boom, a ride control valve 31 and a boom speed increasing valve 33 are integrally arranged in a laminated manner by an internal piping. The ride control valve 31 communicates or cuts off a bottom chamber 11a of a boom cylinder 11 and an accumulator 27. The boom speed increasing valve 33 supplies a discharge pressure of a hydraulic pump 21 to the bottom chamber 11a or a head chamber 11b or connects the to the bottom chamber 11a or the head chamber 11b to a tank 23.
Claims8
A travel vibration suppressing device disposed in a working vehicle, the travel vibration suppressing device absorbing a pressure pulsation generated in an actuator when the working vehicle is traveling, and comprising:
- a hydraulic pump;
- at least one actuator having a pressure chamber and being actuated by pressure oil discharged from the hydraulic pump;
- an accumulator connected to the pressure chamber in the at least one actuator for absorbing a pressure pulsation generated in the pressure chamber;
- a directional control valve for controlling a supply and a discharge of the pressure oil to the at least one actuator;
- and
- a ride control valve for switching a communicating state and a cutout state between the accumulator and the pressure chamber, the cutout state being a state in which flow of pressure oil through the ride control valve to and from the accumulator and the pressure chamber is prevented,
- wherein the ride control valve is located in a ride valve body,
- the directional control valve is located in a directional control valve body,
- the ride valve body is disposed on the directional control valve body in a laminated manner,
- the ride control valve and the directional control valve are connected through an internal piping in the ride valve body and the directional control valve body,
- the travel vibration suppressing device comprises a first pressure sensor for detecting a load pressure of the at least one actuator,
- a communication opening area of the ride control valve which communicates between the accumulator and the pressure chamber is controlled on a basis of a detected signal from the first pressure sensor, and
- the communication opening area is relatively small when a load pressure detected by the first pressure sensor is a relatively high load pressure and the communication opening area is relatively large when a load pressure detected by the first pressure sensor is a relatively low load pressure.
A travel vibration suppressing device disposed in a working vehicle, the travel vibration suppressing device absorbing a pressure pulsation generated in an actuator when the working vehicle is traveling, and comprising:
- a hydraulic pump;
- at least one actuator having a pressure chamber and being actuated by pressure oil discharged from the hydraulic pump;
- an accumulator connected to the pressure chamber in the at least one actuator for absorbing a pressure pulsation generated in the pressure chamber;
- a directional control valve for controlling a supply and a discharge of the pressure oil to the at least one actuator;
- and
- a ride control valve for switching a communicating state and a cutout state between the accumulator and the pressure chamber, the cutout state being a state in which flow of pressure oil through the ride control valve to and from the accumulator and the pressure chamber is prevented,
- wherein the ride control valve is located in a ride valve body,
- the directional control valve is located in a directional control valve body,
- the ride valve body is disposed on the directional control valve body in a laminated manner,
- the ride control valve and the directional control valve are connected through an internal piping in the ride valve body and the directional control valve body,
- the travel vibration suppressing device comprises a first pressure sensor for detecting a load pressure of the at least one actuator, and a travel state detecting sensor for detecting a travel state of the working vehicle, wherein
- a communication opening area of the ride control valve which communicates between the accumulator and the pressure chamber is controlled based on at least any one of the load pressure of the actuator detected by the first pressure sensor and the travel state of the working vehicle detected by the travel state detecting sensor, and
- wherein, when an increase of the load pressure of the actuator is detected by the first pressure sensor and/or when an increase of a traveling speed of the working vehicle is detected by the travel state detecting sensor, the communication opening area becomes smaller than an upper limit of the communication opening area.
A travel vibration suppressing device disposed in a working vehicle, the travel vibration suppressing device absorbing a pressure pulsation generated in an actuator when the working vehicle is traveling, and comprising;
- a hydraulic pump;
- at least one actuator actuated by pressure oil discharged from the hydraulic pump;
- an accumulator connected to a pressure chamber in the at least one actuator for absorbing a pressure pulsation generated in the pressure chamber;
- a directional control valve for controlling a supply and a discharge of the pressure oil to the at least one actuator;
- and
- a ride control valve for switching a communicating state and a cutoff state between the accumulator and the pressure chamber,
- wherein the ride control valve is located in a ride valve body,
- the directional control valve is located in a directional control valve body,
- the ride valve body is disposed on the directional control valve body in a laminated manner,
- the ride control valve and the directional control valve are connected through an internal piping in the ride valve body and the directional control valve body,
- the travel vibration suppressing device comprises a speed increasing valve for increasing a supply amount of the pressure oil from the hydraulic pump to the at least one actuator,
- the speed increasing valve is located in a speed increasing valve body,
- the speed increasing valve is disposed on the ride valve body or the directional control valve body in a laminated manner, and
- the speed increasing valve and the ride control valve or the directional control valve are connected through the internal piping in each body and/or an external piping outside of each body.
Dependencies are inferred from the claim text.