JP2005349913A - Vibrationproof cab supporting device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve habitability and ease of work by efficiently restraining vibration and impact transmitted to a cab from a frame. <P>SOLUTION: This vibrationproof cab supporting device of a construction machine is constituted of the frame 18 to support the cab 14 constituted of a lower side frame part 18A on which the cab 14 is arranged and an upper side frame part 18B one end side of which is fixed on the lower side frame part 18A and the other side of which is extended to cover an upper part of the cab 14 and a vibrationproofing supporting means to absorb the vibration and the impact working on the side of the cab from the frame 18 which is constituted of a first vibrationproof supporting means part 19A provided between the lower side frame part 18A and a floor plate 14A of the cab 14 and a second vibrationproof supporting means 19B provided between an upper surface of the cab 14 and the upper side frame part 18B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a driver's cab anti-vibration support device for construction machines such as a hydraulic excavator and a hydraulic crane, and in particular, to prevent vibrations and shocks from the frame of the construction machine from being transmitted to the driver's cab. The present invention relates to an anti-vibration support device for a cab of a construction machine for supporting a frame on a frame.

  In a construction machine such as a hydraulic excavator, vibrations and impacts such as excavation reaction force generated during excavation work such as earth and sand and vibrations and impacts during traveling are transmitted to a cab (commonly called “cab”) through a frame. This vibration and impact deteriorate the comfort of the driver's cab and the operability of the operation levers disposed in the driver's cab.

  Therefore, as a method of suppressing vibrations and shocks transmitted from the frame to the cab, a structure in which a vibration isolator such as a coil spring or an oil damper is provided between the frame and the lower surface of the cab to attenuate the vibrations and shocks. It is known (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 11-140909.

  However, the invention described in Patent Document 1 has a structure in which a vibration isolator is simply provided between the frame and the lower surface of the cab, and therefore, an effect of sufficiently attenuating vibrations and impacts cannot be obtained. The vibrations and shocks transmitted to the operator were transmitted to the operator in the cab and there were problems in terms of comfort and operability.

  Therefore, there is a technical problem to be solved in order to efficiently suppress the vibration and impact transmitted from the frame to the cab and improve the comfort and operability, and the present invention aims to solve this problem. And

The present invention has been proposed in order to achieve the above object, and the vibration isolating support means for suppressing vibrations and impacts from the frame of the construction machine from being transmitted to the cab arranged on the frame is provided on the frame. And a vibration isolating support device for a construction machine provided between the driver's cab and the driver's cab,
The frame includes a lower frame portion in which the cab is disposed, and an upper frame portion in which one end side is fixed to the lower frame portion and the other end side extends over the upper portion of the cab. And
The anti-vibration support means includes first anti-vibration support means for holding the cab on the lower frame portion between the lower frame portion and the lower surface of the cab, and an upper surface of the cab And an anti-vibration support device for a construction machine comprising a second anti-vibration support means for holding the cab in the upper frame portion between the upper frame portion and the upper frame portion.

  According to this configuration, vibrations and impacts generated on the frame side are absorbed and attenuated by the first and second vibration isolating support means disposed on the lower surface side and the upper surface side of the cab, respectively. This suppresses vibrations and shocks generated on the frame side from being transmitted to the cab side. Further, since the upper and lower surfaces of the cab are supported by the frame via the first and second vibration isolating support means, not only the vibration in the vertical direction, but also the vibration and impact acting in the front and rear, right and left, and the rotational direction. Is suppressed by being absorbed by the first and second vibration isolating support means and transmitted to the cab.

  According to the present invention, since the upper and lower surfaces of the cab are supported by the first and second vibration isolating support means, respectively, in addition to absorbing vibrations and shocks received from the upper and lower surfaces, In addition, vibrations and shocks in the rotation direction can be absorbed, and comfort and operability can be improved.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine cab anti-vibration support device according to the present invention will be described below with reference to preferred embodiments. For the purpose of improving the comfort and operability by efficiently suppressing vibrations and shocks transmitted from the frame to the cab, the frame supporting the cab has a lower frame portion where the cab is disposed, and one end side is The upper frame part is fixed to the lower frame part, and the other end side extends over the upper part of the cab, and the anti-vibration support means is provided between the lower frame part and the lower surface of the cab. A first anti-vibration support means that holds the cab in the lower frame part, and a second that holds the cab in the upper frame part between the upper surface of the cab and the upper frame part. It was realized by configuring with anti-vibration support means.

  FIG. 1 shows a hydraulic excavator as a construction machine to which the present invention is applied. In the hydraulic excavator 10, an upper swing body 13 is rotatably mounted on a lower traveling body 11 via a swing mechanism 12. The upper swing body 13 is provided with a cab (cab) 14 on one front side thereof, and a boom 15 is attached to the front center portion so as to be able to be raised and lowered. An arm 16 is attached to the tip of the boom 15 so as to be rotatable up and down, and a bucket 17 is attached to the tip of the arm 15.

  The upper turning body 13 has a frame 18 attached to the turning mechanism 12, and the frame 18 is composed of a lower frame portion 18A and an upper frame portion 18B. The lower frame portion 18A is directly fixed to the turning mechanism 12. On the other hand, the upper frame portion 18B has a substantially inverted L-shaped cross section, one end of which is fixed to the lower frame portion 18A on the back side of the cab 14, and the other end is operated from the back side of the cab 14. It is provided on the upper side of the chamber 14 and in a state of projecting to the front position of the cab 14 toward the front.

  A plurality of first vibration isolating support means 19A, 19A,... Are arranged between the lower frame portion 18A and the floor plate 14A forming the lower surface of the cab 14, and the upper frame portion 18B and the cab 14 are arranged. The second anti-vibration support means 19B, 19B,... Are arranged between the top plate 14B and the top plate 14B. In the present embodiment, for the sake of explanation, the first anti-vibration support means 19A and the second anti-vibration support means 19B will be described as having the same structure.

  2 and 3 show the structure of the first anti-vibration support means 19A and the second anti-vibration support means 19B. The first anti-vibration support means 19A and the second anti-vibration support means 19B include a rubber body 20 having an air chamber 21 therein, and flanges 22 and 22 fixed to upper and lower surfaces of the rubber body 20, respectively. It becomes. In addition, a shaft-like attachment portion 23 having a screw on the outer periphery is projected from the center portion of each flange 21.

  Of the first anti-vibration support means 19A and the second anti-vibration support means 19B configured as described above, the first anti-vibration support means 19A has one end (lower end) using the mounting portion 23 and a nut (not shown). The one end side is fixed to the lower frame portion 18A via the bracket 24 attached to the) side, and the other end (upper end) side is fixed to the floor plate 14A of the cab 14 using the mounting portion 23 and a nut (not shown). Has been. The cab 14 is supported from below by the first anti-vibration support means 19A attached on the lower frame portion 18A and held on the lower frame portion 18A.

  On the other hand, the second anti-vibration support means 19B is fixed to the upper frame portion 18B at one end side through a bracket 24 attached at one end (upper end) side using a mounting portion 23 and a nut (not shown), and the other end. The (lower end) side is fixed to the top plate 14B of the cab 14 using a mounting portion 23 and a nut (not shown). And the driver's cab 14 is hold | maintained in the state suspended from the upper side with respect to the upper side frame part 18B by the 2nd anti-vibration support means 19B attached to the upper side frame part 18B.

  Therefore, according to the cab antivibration support device configured as described above, when vibration or impact is generated on the frame 18 side, the vibration or impact is applied to the frame 18 and the floor plate 14A of the cab 14 and the frame 18 and the ceiling. Absorption and attenuation by the first and second anti-vibration support means 19A and 19B respectively disposed between the plate 14B and the transmission to the cab 14 side are suppressed. In addition, since the cab 14 is supported by the frame 18 through the first and second anti-vibration support means 19A and 19B, the upper and lower surfaces, that is, the floor plate 14A and the top plate 14B, can be obtained only by vertical vibration. In addition, vibrations and impacts acting in the front-rear, left-right, and rotational directions are also absorbed and attenuated by the first and second anti-vibration support means 19A and 19B, and transmission to the cab 14 is suppressed.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The principal part side view which shows the cab and flame | frame in FIG. Sectional drawing which shows the vibration isolating support means in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Lower traveling body 12 Turning mechanism 13 Upper turning body 14 Cab (cab)
14A Floor board (bottom surface)
14B Top plate (top)
DESCRIPTION OF SYMBOLS 15 Boom 16 Arm 17 Bucket 18 Frame 18A Lower frame part 18B Upper frame part 19A 1st anti-vibration support means 19B 2nd anti-vibration support means 20 Rubber body 21 Air chamber 22 Flange 23 Attachment part 24 Bracket

Claims (1)

An anti-vibration support means for preventing vibrations and shocks from the frame of the construction machine from being transmitted to the cab arranged on the frame is provided between the frame and the cab. In the swing support device,
The frame includes a lower frame portion in which the cab is disposed, and an upper frame portion in which one end side is fixed to the lower frame portion and the other end side extends over the upper portion of the cab. And
The anti-vibration support means includes first anti-vibration support means for holding the cab on the lower frame portion between the lower frame portion and the lower surface of the cab, and an upper surface of the cab And a second anti-vibration support means for holding the cab in the upper frame portion between the upper frame portion and the upper frame portion.

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