Abstract: A cooling device is provided which is easy to assemble and provides improved cooling efficiency by preventing a back flow without fail. To this end, the cooling device has: (a) an axial fan having a plurality of vanes; (b) a power source for driving the axial fan; (c) a tubular fan ring disposed in outer edge portions of the vanes; (d) a projecting portion that extends over substantially entire circumference of the fan ring and projects in an outer peripheral direction; (e) a shroud disposed between the axial fan and an object to be cooled; and (f) an adjusting plate that is fixedly attached to the shroud so as to make a distance from an outer circumferential surface of the fan ring variable and circumferentially divided into a plurality of parts.

Abstract: The present invention is a crawler device for a crawler type vehicle, which lowers the vehicle height, decreases the vehicle width, and exhibits superior stability during operation. For this purpose, in a crawler type vehicle having, on right and left sides of either one of front or rear portion, or both of the front and rear portions of a vehicle body, crawler devices each having a sprocket, an idler disposed on a truck frame, and a crawler belt passed through the sprocket and the idler, the crawler device can include a front end link coupled to a forward part of the truck frame by a pin at a lower end portion thereof and to the side of said vehicle body by a pin at the upper end portion thereof, and can include a rear end link coupled to a rearward part of the truck frame by a pin at the lower end portion thereof and to the side of the vehicle body at a position behind the front end link by a pin at the upper end portion thereof.

Abstract: The present invention is a crawler device for a crawler type vehicle, which lowers the vehicle height, decreases the vehicle width, and exhibits superior stability during operation.

Abstract: The present invention is a crawler device for a crawler type vehicle, which lowers the vehicle height, decreases the vehicle width, and exhibits superior stability during operation.

Abstract: A noise reducer for construction machinery, which efficiently reduces noise at low cost with durability, is provided. For this purpose, lamination plates (8) which are the plates being laminated are bonded, discretely at a predetermined interval (a1), to a part of or the entire of a noise generating element. Lamination plates (8A, 8E) may be bonded discretely at a plurality of kinds of bonding intervals (a1, a2). The lamination plates (8) with the different number of laminations may be bonded according to a noise generating element.

Abstract: A triangular crawler device, which is free from being stumbled and whose crawler belt does not come off from a body of a vehicle while the vehicle travels, includes a track frame (10), having a front idler (15A) and a rear idler (15B) disposed at the front and rear ends thereof respectively; a sprocket (20), rotatably fixed to the track frame (10); links (11, 13), for connecting the body (2) of the vehicle (1) and the track frame (10) together; and a crawler belt (17), wound around the front idler (15A), the rear idler (15B) and the sprocket (20).