JP5091582B2 - Construction machine frame - Google Patents

Description

  The present invention relates to a construction machine frame in which an engine and a transmission are arranged in an opening of an upper plate of a carrier frame.

  2. Description of the Related Art Conventionally, there is known a construction machine frame including a swivel mounted on a carrier frame so as to be horizontally swivelable and a telescopic crane work boom mounted on the swivel so as to be raised and lowered (patent) Reference 1).

In such a construction machine frame, a swivel ring for attaching a swivel base is provided on an upper surface of a mold material which is a carrier frame. Further, a cross member is attached to one end side of the mold material in a direction orthogonal to the longitudinal direction of the mold material to reinforce the mold material.
Japanese Utility Model Publication No.59-155274

  By the way, in such a conventional construction machine frame, an opening is provided on the upper surface of the mold material for mounting the engine and the transmission. The rear edge portion of the opening is formed so as to be orthogonal to the longitudinal direction of the mold material by attaching the cross member in a direction orthogonal to the longitudinal direction of the mold material.

  And an engine is arrange | positioned in the said opening and a transmission is attached to the lower side of the opening.

  For this reason, in the case of an integrated type in which the engine and the transmission are combined, when repairing or maintaining, when removing only the transmission from its opening, if the transmission is not shifted backward by the amount of insertion of the input shaft to the engine output shaft, The transmission input shaft cannot be removed from the engine output shaft. For this reason, if there is no space for shifting the transmission backward due to the provision of the cross member or the like, the engine and the transmission must be removed as a unit, and the removal work becomes large.

  In addition, if the transmission allowance space is secured, there is a problem that the carrier frame becomes longer accordingly.

  An object of the present invention is to provide a frame for a construction machine that can secure a margin for removing a transmission without lengthening a carrier frame.

The invention according to claim 1 is a carrier frame to which wheels that are rotationally driven by an engine via a transmission are attached, a swivel that is attached to the carrier frame so as to be capable of horizontal turning and to which a boom for crane work is attached, A pair of outrigger boxes provided at different positions in the front-rear direction on the left and right sides of the lower portion of the carrier frame, the carrier frame including a pair of side members extending in the front-rear direction. An upper plate attached to an upper portion of the side member, and an opening formed at a front side position of the pair of outrigger boxes on the upper plate. The engine is disposed in the opening and the transmission is A construction machine frame attached to the lower side of the opening,
A cross member is disposed obliquely with respect to the front-rear direction between the pair of side members so as to go from one outrigger box on the front side to the other outrigger box among the pair of outrigger boxes.

  The invention according to claim 2 is characterized in that the cross member is disposed so as to be directed from the position of the front wall surface of one outrigger box to the front wall surface of the other outrigger box.

  The invention of claim 3 is characterized in that a rear edge portion of the opening is formed obliquely along the cross member.

In the invention of claim 4, a lower plate having a concave cross-sectional shape with an open bottom is attached to the rear side of the opening and in the lower part of the carrier frame.
The height position of the concave top plate portion of the lower plate is lowered as it goes rearward, and the width of the top plate portion is increased.

  According to the invention of claim 1, by providing the cross member obliquely, it is possible to secure a margin for removing the transmission without lengthening the carrier frame, and even if the engine and the transmission are integrated, the transmission Can only be removed.

  According to the invention of claim 2, the portion of the carrier frame near the outrigger box where the load is applied can be reinforced.

  According to the invention of claim 3, the area of the opening can be increased, and the transmission can be easily removed.

  According to the fourth aspect of the present invention, when the propeller shaft is inclined and arranged in the carrier frame, a space for arranging the propeller shaft can be secured without impairing the rigidity of the carrier frame.

  Hereinafter, an example which is the best mode of a mobile crane to which a construction machine frame according to the present invention is applied will be described with reference to the drawings.

FIG. 1 shows a mobile crane 10 that is partially omitted. The mobile crane 10 includes a carrier frame 20 extending in the front-rear direction, a driving cabin 40 for traveling provided at a front portion (right end portion in FIG. 1) of the carrier frame 20, and an upper surface on the rear side of the carrier frame 20. A swivel ring 50 provided on the swivel ring 50, a swivel base (not shown) attached to the swivel ring 50, a boom for crane operation (not shown) attached to the swivel base via a bracket (not shown), A work cabin (not shown) for crane work provided on the side of the swivel, an engine 60 (see FIG. 12) attached to the carrier frame 20, a transmission 70, and the like are provided. 61 is an engine hood, 62 is a front wheel, and 63 is a rear wheel.

  Outrigger boxes 80 and 81 are provided on both sides of the lower portion of the carrier frame 20 between the turning ring 50 and the engine 60 (see FIG. 12), and the outrigger box 80 is positioned in front of the outrigger box 81. . Outrigger boxes 82 and 83 are provided on both sides of the lower portion of the rear end portion of the carrier frame 20, and the outrigger box 82 is positioned in front of the outrigger box 83.

The carrier frame 20, the turning ring 50, the turntable (not shown), the outrigger boxes 80 to 83, and the like constitute a construction machine frame.
[Carrier frame 20]
As shown in FIGS. 2 and 3, the carrier frame 20 is provided at a pair of side members 21, 22, an upper plate 23 attached to the upper part of the side members 21, 22, and a lower part of the side members 21, 22. Side member lower plates 24 and 25 (see FIG. 6), and a frame 27 attached to the front wall portion 26 at the tip of the side members 21 and 22. An operation cabin 40 is attached to the frame 27. The side member lower plates 24 and 25 are provided from the position in front of the outrigger boxes 80 and 81 to the rear ends of the side members 21 and 22.

  The upper plate 23 is formed with an opening 23 </ b> A extending from the tip portion to the vicinity of the outrigger boxes 80 and 81. A rear edge portion 23Aa of the opening 23A is formed along a cross member 30 described later.

A cross member 30 is attached between the side members 21 and 22 from the position of the front wall surface 80a of the outrigger box 80 to the position of the front wall surface 81a of the outrigger box 81, as shown in FIGS. The cross member 30 is disposed obliquely with respect to the longitudinal direction of the carrier frame 20 (the longitudinal direction of the vehicle).
[Cross member]
The cross member 30 is formed in a rectangular shape as shown in FIG. 7, and a trapezoidal concave portion 31 is formed in the lower portion thereof. The cross member 30 is fixed to the side members 21 and 22, the upper plate 23, and the side member lower plates 24 and 25 by welding.

  A cross member 32 is attached to the position of the rear surface 81 b of the outrigger box 81 between the side members 21 and 22 in a direction orthogonal to the longitudinal direction of the carrier frame 20.

  The cross member 32 is formed in a rectangular shape as shown in FIG. 8, and a trapezoidal concave portion 33 is formed in the lower portion thereof. The height h1 of the recess 33 is set lower than the height h2 of the recess 31 of the cross member 30. The cross member 32 is fixed to the side members 21 and 22, the upper plate 23, and the side member lower plates 24 and 25 by welding.

  Further, a cross member 35 formed in a rectangular shape as shown in FIG. 9 is interposed between the upper plate 23 of the carrier frame 20 and the side member lower plate 25 (see FIG. 6) at the position of the rear wall surface 80b of the outrigger box 80. Is attached. The width of the cross member 35 is set to be equal to the width of the side member lower plate 25, and is fixed to the side member 21, the upper plate 23, and the side member lower plate 25 by welding.

Further, a lower plate 36 for reinforcement is disposed below the upper plate 23 of the carrier frame 20 in front of the turning ring 50.
[Lower plate 36]
As shown in FIG. 10, the lower plate 36 has a top plate portion 36A and side plate portions 36B and 36C formed on both sides of the top plate portion 36A. As shown in FIGS. 11A to 11C, the width of the top plate portion 36A increases as it goes backward, and the height of the top plate portion 36A decreases as it goes backward.

  The side plate portions 36B and 36C are inclined so that the separation distance becomes wider toward the lower portion. That is, the cross-sectional shape of the lower plate 36 is formed in a concave shape that opens and expands downward.

  Lower portions of the side plate portions 36B and 36C of the lower plate 36 are fixed to the side member lower plates 24 and 25 of the carrier frame 20 by welding or the like as shown in FIG.

The end surface 36 a of the lower plate 36 is inclined along the surface of the cross member 30, and the end surface 36 a is abutted against the surface of the cross member 30 and is welded. The lower plate 36 is inserted into the recess 33 of the cross member 32, and the cross member 32 is welded to the lower plate 36 across the lower plate 36.
[Engine 60, Transmission 70]
As shown in FIGS. 12 and 13, the engine 60 and the transmission 70 are attached to the carrier frame 20 via a bracket (not shown), and the engine 60 is disposed in the opening 23 </ b> A of the upper plate 23 of the carrier frame 20. A transmission 70 is disposed under the opening 23A.

  The first propeller shaft 90 connected to the output shaft of the transmission 70 passes through the recesses 31 and 33 of the cross members 30 and 32 and is disposed below the top plate portion 36 </ b> A of the lower plate 36.

91 is a second propeller shaft connected to the first propeller shaft 90, and 92 and 93 are differentials.
[Operation]
Next, the operation of the mobile crane 10 configured as described above will be described.

As described above, by the cross member 30 is disposed at an angle with respect to the longitudinal direction of the carrier frame 20, provided in the direction orthogonal to the longitudinal direction at the position of the front wall face 80a of the outrigger box 80 The space in which the transmission 70 is arranged becomes wider than that. That is, even if the carrier frame 20 is not lengthened, the space S (see FIG. 4) after the transmission 70 can be ensured as the transmission allowance space by the amount that the cross member 30 is inclined.

  For this reason, even in the case of an integrated type in which the engine 60 and the transmission 70 are combined, the space S allows the transmission 70 to be shifted rearward by the insertion allowance of the input shaft, and the engine output shaft (not shown) ) From the input shaft (not shown) of the transmission 70. For this reason, the transmission 70 can be detached alone, and the maintenance and repair of the transmission 70 are very easy to perform.

  Further, since the rear edge portion 23Aa of the opening 23A of the upper plate 23 is formed obliquely along the cross member 30, the area of the opening 23A is widened by making the rear edge portion 23Aa oblique, so that the transmission 70 It becomes easy to remove.

  Furthermore, by providing the cross member 32 and the cross member 35 in addition to the cross member 30, the portion of the carrier frame 20 in the vicinity of the outrigger boxes 80 and 81 where the load is applied can be sufficiently reinforced. Further, since the cross members 32 and 35 are welded to the lower plate 36, the portions are further sufficiently reinforced.

  Further, since the height of the top plate portion 36A of the lower plate 36 is lowered as it goes rearward, the first and second propeller shafts 90 and 91 are arranged obliquely without impairing the rigidity of the carrier frame 20. Space can be secured.

  The above embodiment has been described with respect to the mobile crane. However, the present invention is not limited to this, and can be applied to other construction machine frames. The present invention is designed and modified without departing from the scope of the invention. It is possible.

It is the side view which abbreviate | omitted and showed the mobile crane of the Example which concerns on this invention. It is the top view which showed the carrier frame of the mobile crane of FIG. It is sectional drawing which follows the EE line of the carrier frame of FIG. FIG. 3 is a partially enlarged plan view in which a part of the carrier frame in FIG. 2 is enlarged. It is sectional drawing which follows the DD line | wire of the carrier frame shown in FIG. It is a bottom view of the carrier frame shown in FIG. It is the front view which showed the cross member arrange | positioned diagonally with respect to a longitudinal direction. It is the front view which showed the cross member arrange | positioned in a orthogonal direction with respect to a longitudinal direction. It is the front view which showed the cross member provided in the side member on the rear wall surface of an outrigger box. It is the perspective view which showed the lower plate shown in FIG. (A) is sectional drawing which follows the AA line of FIG. 5, (B) is sectional drawing which follows the BB line of FIG. 5, (C) is sectional drawing which follows the CC line of FIG. FIG. 3 is a plan view showing a state where an engine and a transmission are attached to the carrier frame shown in FIG. 2. FIG. 3 is a longitudinal sectional view showing a state where an engine and a transmission are attached to the carrier frame shown in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile crane 20 Carrier frame 21, 22 Side member 23 Upper plate 23A Opening 30 Cross member 36 Lower plate 60 Engine 70 Transmission 80, 81 Outrigger box

Claims (4)

A carrier frame to which wheels that are rotationally driven by an engine via a transmission are mounted; a swivel that is mounted on the carrier frame so as to be capable of horizontal swiveling and that has a boom for crane operation; and a position in front of the swivel A pair of outrigger boxes provided on the left and right sides of the lower portion of the carrier frame so that the positions in the front-rear direction are different from each other. A construction having an attached upper plate and an opening formed at a front side position of the pair of outrigger boxes on the upper plate, and arranging the engine in the opening and attaching the transmission to the lower side of the opening. A machine frame,
A construction characterized in that a cross member is disposed obliquely with respect to the front-rear direction between the pair of side members so as to go from one outrigger box on the front side to the other outrigger box among the pair of outrigger boxes. Frame for machine.   The construction machine frame according to claim 1, wherein the cross member is disposed so as to be directed from a position of a front wall surface of one outrigger box to a front wall surface of the other outrigger box.   The construction machine frame according to claim 1, wherein a rear edge portion of the opening is formed obliquely along the cross member. A lower plate having a concave cross-section with the lower part opened is attached to the rear side of the opening and in the lower part of the carrier frame,
The height position of the concave top plate portion of the lower plate is lowered as it goes rearward, and the width of the top plate portion is widened. The construction machine frame described.