Hydraulic oil tank attachment structure of construction machine
A hydraulic oil tank attachment structure arranged in a construction machine secures the strength of a hydraulic oil tank as well as secures a large capacity thereof. The attachment structure is arranged in a compact excavator provided with a revolving superstructure, a working device attached to the revolving superstructure, a hydraulic actuator including a revolving motor that drives the revolving superstructure and an actuator that drives the working device. A hydraulic oil tank made of synthetic resin, which stores hydraulic oil to be supplied to the hydraulic actuator, is attached on a revolving frame of the revolving superstructure. The hydraulic oil tank attachment structure has a holding member provided with a projecting part formed on a side surface of the tank, which is fixed on the revolving frame of the revolving superstructure so as to surround side surfaces thereof to hold the hydraulic oil tank via the projecting part.
1. A hydraulic oil tank attachment structure of a construction machine provided with a revolving superstructure, a working device that is attached to the revolving superstructure, a hydraulic actuator including a revolving motor that drives the revolving superstructure and an actuator that drives the working device, and a hydraulic oil tank made of synthetic resin, which stores therein a hydraulic oil to be supplied to the hydraulic actuator and is attached on a revolving frame of the revolving superstructure, comprising
a holding member engaged by a projecting part formed on a side surface of the hydraulic oil tank, wherein the holding member is fixed onto the revolving frame of the revolving superstructure and surrounds side surfaces of the hydraulic oil tank to hold the hydraulic oil tank via the projecting part, wherein
the holding member that is formed to be vertically extended includes:
an iron plate member provided with a hole formed therein; and
a bushing having elasticity, which is formed in the shape of a ring and fitted to the hole of the plate member of the holding member,
the projecting part of the hydraulic oil tank is inserted into the bushing that is fitted to the hole of the plate member to hold the hydraulic oil tank,
the plate member is one of a plurality of plate members that include:
a first plate member having a bottom plate that is attached onto the revolving frame and a standing plate that is coupled to the bottom plate and is formed to be vertically extended,
a second plate member having an attaching plate that is attached to the standing plate of the first plate member and is formed to be vertically extended and a side plate that is coupled to the attaching plate and is formed to be vertically extended, and
a third plate member having an attaching plate that is attached to the standing plate of the first plate member and is formed to be vertically extended and a side plate that is coupled to the attaching plate of the third plate member, arranged so as to face the side plate of the second plate member, and formed to be vertically extended,
holes to which bushings are fitted are respectively formed in the side plate of the second plate member and the side plate of the third plate member, and
the hydraulic oil tank is mounted on the bottom plate of the first plate member and is held by the first plate member, the second plate member, and the third plate member such that the standing plate of the first plate member, the side plate of the second plate member, and the side plate of the third plate member surround three side surfaces of the hydraulic oil tank.
2. The hydraulic oil tank attachment structure of a construction machine according to claim 1 , wherein
a hole that accommodates a connecting part for connecting a supplying pipe that is provided in a bottom of the hydraulic oil tank is formed in the bottom plate of the first plate member,
a hole for reduction in weight is formed in the side plate of the second plate member, and
a hole for reduction in weight is formed in the side plate of the third plate member.
3. The hydraulic oil tank attachment structure of a construction machine according to claim 2 , wherein a fixing bracket is provided on the revolving frame and an attaching bracket that is attached to the fixing bracket is provided on an under surface of the bottom plate.
4. The hydraulic oil tank attachment structure of a construction machine according to claim 1 , wherein a fixing bracket is provided on the revolving frame and an attaching bracket that is attached to the fixing bracket is provided on an under surface of the bottom plate.