Rotating frame of construction machinery
A technology of rotating frames and construction machinery, which is applied in earth movers/excavators, construction, etc. It can solve the problems of weight increase, small interval between installation pedestals, upper flange obstacles, etc., and achieve weight reduction, cost reduction, Effect of suppressing stress concentration
Active Publication Date: 2015-12-16
NIHON KENKI CO LTD
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Problems solved by technology
However, depending on the type of prime mover to be mounted, the distance between the left and right mounting bases is small, and for example, the oil pan or the like provided on the lower surface side of the prime mover cannot be accommodated between the left and right rear vertical plates. question
[0007] In particular, in the prior art, since upper flanges are respectively provided on the upper ends of the left and right rear longitudinal panels to form a beam structure with an I-shaped cross section, the upper flanges become an obstacle when the engine is mounted. There is a problem that the carrying space cannot be secured
On the other hand, if the upper flange is not provided, thick plates have to be used to form the left and right rear vertical panels in order to ensure the strength as a rotating frame, resulting in an increase in the overall weight
Method used
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Embodiment Construction
[0071] Hereinafter, the revolving frame of the construction machine according to the embodiment of the present invention will be described in detail with reference to the drawings, taking the case of being applied to a hydraulic excavator having a crawler-type undercarriage as an example.
[0072] here, Figure 1 to Figure 10 Embodiments of the present invention are shown. In the drawings, reference numeral 1 is a hydraulic excavator as a construction machine. The hydraulic excavator 1 is configured to include a crawler-type undercarriage 2 , and is rotatably mounted on the undercarriage 2 via a swivel ring 3 . The upper revolving body 4 and the working device 8 described later.
[0073] In addition, the upper revolving body 4 has a revolving frame 11 described later, and the revolving frame 11 is provided with figure 1 Shown are the cab box 5, the exterior cover 6, the counterweight 7, and the like. Furthermore, the cab box 5 constitutes an operation cab for an operator to...
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The invention provides a rotary frame of an engineering machine capable of increasing gaps between a left installation pedestal and a right installation pedestal and realizing light weight at the same time of guaranteeing the strength of the frame. On a left rear longitudinal plate of a left and a right rear longitudinal plate (20, 21) of a tail frame (18), a bending part (20C) is arranged in the middle in the front and the rear direction, thereby making the gap in a horizontal direction of the left rear longitudinal plate (20) one side and the right rear longitudinal plate (21) on the other side small on the side of the front and large on the rear part (20B). Front ends of the left and the right rear longitudinal plate (20, 21) are arranged on the rear end side of front left and right longitudinal plates (14, 15). Upper flanges (24, 25) are arranged on an upper end of the joint part (22, 23) of the front longitudinal plates, thereby forming a girder having an I shaped girder. The installation pedestals (32-35) used for installing the generators are jointed with the left and right rear longitudinal plates (20, 21) at positions having increasing gap since penetrating through the bending part (20C) of the left rear longitudinal plate (20).
Description
technical field [0001] The present invention relates to a revolving frame of a construction machine suitable for use in an upper revolving body of a hydraulic excavator, for example. Background technique [0002] Generally, a construction machine such as a hydraulic excavator is composed of an undercarriage, an upper revolving unit rotatably mounted on the undercarriage via a revolving ring, and a front side of the upper revolving unit for excavating sand and soil. Construction of work equipment for work, etc. The above-mentioned revolving body has a revolving frame formed as a supporting structure, and the revolving frame is provided with: a cab box internally defining a cab; and an exterior cover arranged on the rear side of the cab box and A machine room for accommodating a prime mover, etc.; and a counterweight, etc., which are arranged on the rear side of the exterior cover to achieve weight balance of the upper revolving body with respect to the working device (for ex...
Claims
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IPC IPC(8): E02F9/08
Inventor 沟口和彦久野诚
Owner NIHON KENKI CO LTD