JPH11241370A - Power part structure for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power part structure to cover the rotation exposure side of a pulley, and a belt. SOLUTION: This device is provided with an engine, a rotation transmitting means to transmit rotation of an engine rotation shaft, and an accessary equipment having a drive shaft 45 driven to rotate by the rotation transmitting means. It is also provider with a radiator disposed to face an inner fan of the accessary equipment, a fan guard fixed to the radiator to surround the fan, and a cover fixed to the engine to surround at least a part of the rotation transmitting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit structure around an engine mounted on a construction machine such as a hydraulic shovel or a work vehicle.

[0002]

2. Description of the Related Art FIG. 11 is a sectional view showing a main part of a shroud structure according to an embodiment disclosed in Japanese Utility Model Laid-Open No. 2-1418. In the drawing, 1 is a radiator for cooling the engine 2, 3 is a cooling fan provided on the engine 2 side, 4 is a shroud, 5 is a fan guard, 6 is a fan pulley provided on a fan drive shaft a, Reference numeral 7 denotes a V-belt wound around a fan pulley 6 and a crank pulley (not shown) provided on a crankshaft of the engine 2. When the engine 2 shown in FIG. 11 is operated, the fan 3 also rotates, and cooling air from the outside passes through an air passage in the radiator 1 as shown by an arrow W to perform a cooling operation of the radiator 1. FIG. 12 is a diagram viewed from AA in FIG. 11. As shown in FIG. 12, a fan guard 5 for preventing human contact with the fan 3 is attached to the rear side of the shroud 4.

FIG. 13 is a schematic perspective view showing a radiator cooling fan cover for an internal combustion engine described in Japanese Patent Application Laid-Open No. Hei 7-332088. FIG. 13 shows the cover 16 with a half of the net 13 removed. is there. In the cover 16 shown in FIG. 13, a straightening vane 17 is connected to the first tubular member 18 a and the second tubular member 18 b on the rear side of the shroud 14 and the fan 12, and the straightening vane 17 is connected to the mesh 13. Covering. Reference numeral 15 is a radiator.

FIG. 14 shows an engine 11 according to an embodiment of the prior art described in Japanese Patent Application Laid-Open No. 6-146340.
FIG. In the figure, reference numeral 21 denotes an alternator for power generation attached to the engine 11 (Japanese Patent Laid-Open No.
No. 146340 discloses an alternator of an internal fan type. Reference numeral 22 denotes an alternator pulley fitted on an alternator drive shaft 23 of an alternator 21, reference numeral 24 denotes a V-belt for transmitting engine rotation, and reference numeral 25 denotes a fan pulley. is there.

[0005]

As shown in FIGS. 11 to 13, the exposed portion of the rear side of the shroud of the radiator cooling fan is conventionally covered with a fan guard to prevent the fan from contacting with the fan. I have to. However, a protective cover is provided for the belt that is stretched around the crank pulley attached to the crankshaft of the engine and the drive pulley of the accessory provided on the outer peripheral side of the engine. Not been. Therefore, when human hands, clothes, or other obstacles come into contact with the pulley, belt, or the like, the hands, clothes, or other obstacles may be involved. An object of the present invention is to provide a power unit structure of a construction machine that covers the rotation exposed side of the pulley and the belt.

[0006]

According to the present invention, there is provided an accessory having an engine, rotation transmitting means for transmitting the rotation of a rotating shaft of the engine, a drive shaft rotated by the rotation transmitting means, A radiator arranged facing the inner fan of the device, a fan guard fixed to the radiator and surrounding the fan, and a cover means fixed to the engine and surrounding at least a part of the rotation transmitting means. Equipped. This prevents not only the fan but also the operator's hand, clothes, other tools, and the like from contacting and getting caught in the rotation transmitting unit during maintenance around the power unit. Also, since the cover means is attached to the engine, the cover means can be easily attached if the engine cover means is attached in advance at the time of assembling and manufacturing the construction machine, and then the engine is mounted on the construction machine body. .

Further, the rotation transmitting means is wound around the crank pulley attached to the rotation shaft of the engine, the drive pulley attached to the drive shaft of the accessory, and the crank pulley and the drive pulley. Since the belt and the pulley are used, it is possible to prevent the hand, clothes, and the like of the worker from being caught in the belt or the pulley during maintenance or the like as described above.

Further, the rotation transmitting means has a plurality of pulleys for driving the auxiliary equipment such as a fan, an alternator and the like, and the cover means has at least two or more of the plurality of pulleys. Since the pulley is enclosed, it is easy to attach the cover means.

Further, the cover means is formed by dividing into a plurality of cover pieces and can be divided at the drive shaft portion of the fan, so that the cover means can be attached and detached after the engine is mounted on the construction machine body. Can be performed easily, and the maintainability of the rotation transmitting means can be improved.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a revolving body 26 of a hydraulic shovel (an overall view of a hydraulic shovel is not shown) having a power unit structure according to an embodiment of the present invention. In the figure, reference numeral 27 denotes a counterweight mounted on the rear part of the revolving body 26, and reference numeral 28 denotes an engine hood above an engine room (not shown in FIG. 1 but described later). FIG.
1 is a side view of a main part of an engine 29 having a power unit structure according to the first embodiment as viewed from BB of the revolving superstructure 26 in FIG. 1 (the rear side of the revolving superstructure 26 but the engine 29 is placed sideways). Because it is arranged). In the drawing, reference numeral 30 denotes an engine room in the revolving body 26, 31 denotes a cooling fan driven by the engine 29, 32 denotes a shroud for the fan 31, 33 denotes a radiator, and 34 denotes a fan fixed to a rear surface of the shroud 32. , A fan guard covering the rear surface side, a cover 35 of the first embodiment, and a revolving body 26
The driver's cab is equipped with FIG. 3 shows C in FIG.
It is a partially cut-out enlarged view of a part. In the drawing, reference numeral 37 denotes a rotating shaft of the engine 29, 38 denotes a crank pulley attached to the rotating shaft 37, 39 denotes a compressor pulley for driving a compressor (described later) fixedly arranged on the crank pulley 38, and 40 denotes a pulley. A fan drive shaft for driving the fan 31, 41 is a fan pulley, and 10a is a V-belt.

FIG. 4 is a front view showing the power unit structure of the first embodiment as viewed from the line DD in FIG. 3, but includes an engine 29 other than the cover 35, and accessories attached to the engine 29 that are rotated by the engine 29. Are indicated by imaginary lines for clarity. In the figure, 35a and 35b have two covers 35.
Each cover piece, line Fa-
Fa is an assembling surface of the cover pieces 35a and 35b, 42 is a bolt for fastening the cover pieces 35a and 35b to a fixing portion on the engine 29 side, and 43 is a cover piece 35a and 3b.
A bolt for tightening an assembly surface (Fa-Fa) with 5b, 44 is an alternator for power generation, 45 is an alternator drive shaft of the alternator 44, and 46 is an alternator pulley provided on the alternator drive shaft 45. FIG. 5 is a diagram showing the disassembly and assembly structure of the cover 35, but illustration of the tightening bolts 42 and 43 (shown in FIG. 4) is omitted.

Next, a power unit structure according to a first embodiment of the present invention will be described with reference to FIGS. In the power unit structure according to the first embodiment, the wire is made of, for example, a wire member such as a bar member (member A shown in FIG. 5) or a plate member (member B shown in FIG. 5) made of steel. The mesh size is set to be small as required) to form a split type cover 35 that can be disassembled into two cover pieces 35a and 35b, and a crank pulley 38 (FIGS. 3 and 4). , Fan pulley 41 (shown in FIGS. 3 and 4), alternator pulley 4
6 and the V-belt 10a so as to cover the rotation-exposed side of the V-belt 10a and the cover 35 with bolts 42 (shown in FIG. 4).
It was attached to the engine 29 by tightening. That is, the fan pulley 41 of the cooling fan 31 of the radiator 33 and the alternator pulley 46 of the alternator 44 for power generation are set as the drive pulleys of the engine accessories that are covered by the cover 35.

Next, the operation of the power unit structure according to the first embodiment of the present invention will be described. In the power part structure of the first embodiment, the cover 35 is formed by welding wires such as the bar member A and the plate member B of the steel net material in a net shape, and the cover 35 forms the crank pulley 38 and the fan pulley 4.
1, because the alternator pulley 46 and the rotation-exposed side of the V-belt 10a are covered, even if a human hand, clothes, or other obstacles come into contact with the cover 35, the hands, clothes, or other obstacles are not covered by the cover 35. It can be prevented from being caught in the pulleys 38, 41, 46 and the V-belt 10a. Also, the cover 35 is divided into two cover pieces 35a and 3
5b, the cover 35 is attached to the engine 29, and the cover 35 can be easily attached to and detached from the engine 29. And can be securely fixed in one piece.

FIG. 6 shows an engine 29 '(in this engine 29', a fan drive shaft for rotating a radiator cooling fan and a rotation shaft of the engine 29 'are connected via a gear not shown). FIG. 10 is a front view showing a power unit structure according to a second embodiment configured for a fan drive shaft which is gear-driven by the rotation shaft and thus does not have a fan pulley. In the drawing, components using the same components as those of the power unit structure of the first embodiment shown in FIG. 40 ′ is a fan drive shaft of the engine 29 ′, and 47a and 47b are covers 4
A cover piece 7 and a line Fb-Fb formed so as to be disassembled into two are assembly faces of the cover pieces 47a and 47b. FIG. 7 is a view showing the disassembly and assembly structure of the cover 47, but illustration of the tightening bolts 42 and 43 in FIG. 6 is omitted.

Next, the structure and operation of a power unit according to a second embodiment of the present invention will be described with reference to FIGS. In the power part structure according to the second embodiment, the wires such as the bar member and the plate member of the steel rope material are welded in a net shape to form a split type cover 47 that can be disassembled into two cover pieces 47a and 47b. Then, the crank pulley 38, the alternator pulley 46 and the V-belt 10b were covered so as to cover the rotationally exposed side, and the cover 47 was attached to the engine 29 'by tightening bolts 42. That is, the alternator pulley 46 of the alternator 44 for power generation is set as a drive pulley of the rotating object attached to the engine covered by the cover 47.
The operation of the power unit structure of the second embodiment is the same as the operation of the power unit structure of the first embodiment.

Next, FIG. 8 is a side view of a main part of a partially cut-away portion showing a power unit structure according to a third embodiment. In the figure, FIGS.
Components using the same components as those of the power unit structure of the first embodiment shown in FIG. 3 are denoted by the same reference numerals. Reference numeral 48 denotes a cab for an air conditioner (not shown) for operating the cab 36, 49 a compressor pulley provided on a compressor drive shaft (not shown) for rotating the compressor 48, and 34 ′ fixed to a rear surface of the shroud 32. The fan guard is provided and covers the rear side of the fan 31.
7 is a cover of the embodiment. FIG. 9 is a front view showing the power unit structure of the third embodiment as viewed from EE in FIG.
In the drawing, 50a and 50b are cover pieces each formed so that the cover 50 can be disassembled into two pieces, lines Fc-Fc are assembly surfaces of the cover pieces 50a and 50b, 51 is a tension pulley for tensioning the V-belt, and 52 is This is a V-belt wound around a compressor pulley 39 and a compressor pulley 49 which are integral with the crank pulley 38. FIG.
FIG. 10 is a view showing the disassembled and assembled structure of the cover 50, but illustration of fastening bolts 42 and 43 (shown in FIG. 9) is omitted.

Next, the structure and operation of a power unit according to a third embodiment of the present invention will be described with reference to FIGS. In the power unit structure according to the third embodiment, a wire such as a bar member or a plate member of a steel rope material is welded in a net shape to form a split type cover 50 that can be disassembled into two cover pieces 50a and 50b. A crank pulley 38, a fan pulley 41, an alternator pulley 46, and a V-belt 10a, and a compressor pulley 39, a compressor pulley 49, a tension pulley 51, and a V-belt 52 integrated with the crank pulley 38.
And the cover 5
0 to the engine 2 by tightening the bolt 42 (shown in FIG. 9).
9. That is, a fan pulley 41 of the radiator 33, a fan 31 of the cooling fan 31, an alternator 46 of the alternator 44 for power generation, a compressor pulley 49 of a compressor 48 for the air conditioner, and a tension pulley 51 are set as drive pulleys of the engine accessory equipment covered by the cover 50.

[0018]

According to the power unit structure of the present invention, an engine mounted on a construction machine, a rotation transmitting means for transmitting rotation of a rotation shaft of the engine, and a drive shaft rotatably driven by the rotation transmitting means are provided. Attachment device, a radiator arranged to face an inner fan of the attachment device, a fan guard fixed to the radiator and surrounding the fan, and at least a part of the rotation transmission means fixed to the engine. Cover means surrounding the power unit, it is possible to prevent not only the fan but also the rotation transmitting unit from coming into contact with the maintenance unit around the power unit, thereby preventing the hand, clothes, other tools, etc. of the operator from being caught in the unit. . Also, since the cover means is attached to the engine, the cover means can be easily attached if the engine cover means is attached in advance at the time of assembling and manufacturing the construction machine, and then the engine is mounted on the construction machine body. .

Still further, the rotation transmitting means is wound around the crank pulley attached to the rotating shaft of the engine, the driving pulley attached to the driving shaft of the accessory, and the crank pulley and the driving pulley. Since the belt and the pulley are used, it is possible to prevent the hand, clothes, and the like of the worker from being caught in the belt or the pulley during maintenance or the like as described above.

Furthermore, the rotation transmitting means has a plurality of pulleys for driving the fan, the alternator and the like as the accessory, and the cover means has at least two or more of the plurality of pulleys. Since the pulley is enclosed, it is easy to attach the cover means.

Further, the cover means is formed by dividing into a plurality of cover pieces, and the cover means can be divided at the drive shaft portion of the fan, so that the cover means can be attached and detached after the engine is mounted on the construction machine body. Can be easily performed, and the maintainability of the rotation transmitting means can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a swing body of a hydraulic shovel having a power unit structure according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of an engine having a power unit structure according to the first embodiment, as viewed from the line BB in FIG.

FIG. 3 is a partially cut-away enlarged view of a portion C in FIG. 2;

FIG. 4 is a front view showing the power unit structure of the first embodiment as viewed from the line DD in FIG. 3;

FIG. 5 is a diagram showing an exploded configuration of the cover in FIG. 4;

FIG. 6 is a front view illustrating a power unit structure according to a second embodiment configured for an engine in which a fan drive shaft is gear-driven by an engine rotation shaft.

7 is a diagram showing an exploded configuration of the cover in FIG. 6;

FIG. 8 is a partial cutaway main part side view showing a power unit structure according to a third embodiment.

FIG. 9 is a front view showing the power unit structure of the third embodiment as viewed from EE in FIG. 8;

FIG. 10 is a view showing a disassembled structure of the cover in FIG. 9;

FIG. 11 is a sectional view of a main part showing a shroud structure according to an embodiment of the prior art.

FIG. 12 is a diagram viewed from AA in FIG. 11;

FIG. 13 is a schematic perspective view showing a radiator cooling fan cover of an internal combustion engine according to one embodiment of the prior art.

FIG. 14 is a perspective view showing a main part of an engine according to a conventional art.

[Explanation of symbols]

1,15,33 Radiator 2,11,29,29 'Engine 3,12,31 Fan 4,14,32 Shroud 5,34,34' Fan guard 6,25,41 Fan pulley 7,10a, 10b, 24, 52 Cover 16, 35, 47, 50 Cover 21, 44 Alternator 22, 46 Alternator pulley 23, 45 Alternator drive shaft 37 Rotary shaft 38 Crank pulley 39, 49 Compressor pulley 40, 40 ', a Fan drive shaft 35a, 35b, 47a , 47b, 50a, 50b Cover piece 48 Compressor 51 Tension pulley

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Iwama 3-12-4 Gion, Asaminami-ku, Hiroshima City, Hiroshima Prefecture Inside Aburaya Heavy Industries, Ltd. (72) Inventor Shigeaki Saito 3, Gion, Asaminami-ku, Hiroshima City, Hiroshima Prefecture 12-4 Yuya Heavy Industries Co., Ltd.

Claims (4)

[Claims] 1. An engine, a rotation transmitting means for transmitting rotation of a rotation shaft of the engine, an accessory having a drive shaft driven to rotate by the rotation transmitting means, and a fan as one of the accessories. A radiator arranged facing the front, a fan guard fixed to the radiator and surrounding the fan, and a cover means fixed to the engine and surrounding at least a part of the rotation transmitting means, Power structure of construction machinery. 2. The rotation transmission means is wound around a crank pulley attached to a rotation shaft of the engine, a drive pulley attached to a drive shaft of the accessory, and the crank pulley and the drive pulley. The power unit structure of a construction machine according to claim 1, wherein the power unit structure is constituted by a belt. 3. The rotation transmitting means has a plurality of pulleys for driving the fan, the alternator, etc., which are the accessory devices, and the cover means has at least two or more pulleys among the plurality of pulleys. The power unit structure of a construction machine according to claim 2, wherein the power unit structure is enclosed. 4. The power unit of a construction machine according to claim 1, wherein said cover means is formed by dividing into a plurality of cover pieces and can be divided by a drive shaft portion of said fan. Construction.