JP2000265494A - Travelling type hydraulic construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly miniaturize and compact a construction machinery as demanded, to simultaneously improve maintainability and to improve workability and working performance at the time of inspection or repair. SOLUTION: A travelling type hydraulic construction machinery 1 loading an engine unit 2 including a hydraulic pump on it and to drive hydraulic actuators 3a, 3b, 3c... by pressure oil to be supplied from the engine unit 2 is constituted. In this case, an operation part 5a to support the engine unit 2 on a support base part 4 of a construction machinery main body M free to displace it at least to a storage position Pr and a maintenance position Pm and to displace the engine unit 2 is furnished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling hydraulic construction machine such as a backhoe on which an engine unit including a hydraulic pump is mounted.

[0002]

2. Description of the Related Art A backhoe is widely known as a traveling hydraulic construction machine. The backhoe usually has a chassis portion, and a traveling portion that travels by a pair of left and right crawlers via a turning portion below the chassis portion, and a driver's cab, an engine unit, and the like above the chassis portion. Prepare. In addition, a boom section for supporting the bucket section is provided at a front end of the chassis section, and a counterweight for balancing front and rear weight balance is provided at a rear section of the chassis section.

[0003] By the way, in order to reduce the size and size of the conventional traveling hydraulic construction machine, such as the backhoe, an engine unit including a hydraulic pump uses an empty space such as a rear lower portion of a driver's seat. It is often set up.

[0004] However, in such a traveling hydraulic construction machine that is designed to be compact and compact, the condensed design has a small dead space. In this case, there is a problem that the workability is deteriorated and the work efficiency is lowered.

[0005] The present invention has been made to solve the problems existing in the prior art, and while maintaining the compactness and compactness required for construction machinery, and at the same time, improving the maintainability, the inspection and repair during the inspection or repair. It is an object of the present invention to provide a traveling hydraulic construction machine capable of improving workability and work efficiency in a hydraulic construction machine.

[0006]

According to the present invention, there is provided a traveling system in which an engine unit 2 including a hydraulic pump is mounted and hydraulic actuators 3a, 3b, 3c... Are driven by pressure oil supplied from the engine unit 2. When configuring the hydraulic hydraulic construction machine 1, the engine unit 2 is supported on the support base portion 4 of the construction machine main body M at least at a storage position Pr and a maintenance position Pm so as to be displaceable, and an operation unit for displacing the engine unit 2 is provided. 5a and 5b.

In this case, according to a preferred embodiment, the engine unit 2 and the counterweight 6 are displaceably supported together on a support base 4 provided at the rear of the construction machine main body M, and the engine unit 2 The upper part is covered by a telescopic cover 7. The traveling hydraulic construction machine 1 is preferably applied to the backhoe 1a.

[0008]

Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, the configuration of a backhoe 1a (a traveling hydraulic construction machine 1) according to this embodiment will be described with reference to FIGS.

Reference numeral 10 denotes crawlers 11p provided on the left and right,
The traveling section 11q travels, and a chassis section 13 is provided on the traveling section 10 via a turning section 12. An operator cab 14 is provided on the chassis 13, and a boom 15 is provided at a front end of the chassis 13. The boom section 15 includes a boom main body section 16 and an arm section 17, and supports a bucket section 18 at the tip of the arm section 17. Thereby, the construction machine main body M according to the present invention is configured.

On the other hand, a rear portion of the chassis portion 13 becomes a support base portion 4 having a flat surface.
The support plate 21 is provided via a pair of left and right guide rails 20p and 20q shown in FIG. The support plate 21 slides in the front-rear direction by the guide rails 20p and 20q,
It is possible to move to at least the front storage position Pr and the rear maintenance position Pm. The engine unit 2 is installed at the front of the upper surface of the support plate 21, and the counterweight 6 is installed at the rear of the upper surface of the support plate 21.
Therefore, the engine unit 2 and the counter weight 6
Are displaceably supported together on a support base 4.

In this case, the engine unit 2 includes a hydraulic pump and a generator driven by the engine. Accordingly, the hydraulic oil discharged from the hydraulic pump is supplied to the various hydraulic actuators 3 a..., Specifically, the hydraulic cylinders 3 a, 3
b, 3c, an oil motor provided in the traveling section 10 and the turning section 12 and the like (circulation), the respective sections of the backhoe 1a are drive-controlled, and an electric cable 23 from the generator.
Is supplied to each part of the backhoe 1a via the. On the other hand, fuel is supplied to the engine unit 2 via a fuel pipe 24 from a fuel tank provided on the construction machine main body M side. In this case, since the engine unit 2 is displaced in the front-rear direction, the lengths of the oil distribution pipe 22, the electric cable 23 and the fuel pipe 24 are selected by loosening or the like, and the engine unit 2 is displaced.
Is considered so that it can respond to the displacement of Note that there is no mechanical connection between the engine unit 2 and the construction machine main body M side.

On the other hand, reference numeral 5a denotes an operation unit, which includes a hydraulic cylinder 25. In the hydraulic cylinder 25, the cylinder body 25 c is fixed to the chassis 13, and the distal end of the drive rod 25 r protruding from the cylinder body 25 c is fixed to a connecting portion 26 provided integrally with the front end of the support plate 21. .

The upper part of the engine unit 2 is covered by a telescopic cover 7. As the telescopic cover 7, for example, an arched bellows cover 27 as shown in the embodiment can be used. The rear end of the bellows cover 27 is connected to the counterweight 6, and the front end is a body panel of the cab 14. 28 to be detachably connected. In addition, the elastic cover 7
Consideration is given so that the overall waterproofness does not deteriorate or dust infiltration occurs due to the provision of the above.

Next, the functions and operations of the main parts of the backhoe 1a according to the present embodiment will be described with reference to FIGS.

The backhoe 1a according to this embodiment can move the support plate portion 21 forward and backward by driving the hydraulic cylinder 25. First, the hydraulic cylinder 25 is driven, and the drive rod 25r is retracted into the cylinder main body 25c.
It moves forward by being guided by 0p and 20q. That is, the engine unit 2 and the counterweight 6 installed on the support plate 21 are displaced forward together. When the support plate 21 moves to the forefront end shown by a solid line in FIGS. 1 and 2, the engine unit 2 and the counterweight 6 are located at the regular storage position Pr. In the storage position Pr, the position of the support plate 21 is locked by a lock mechanism (not shown).

On the other hand, during maintenance, the lock by the lock mechanism is released, and the front end of the telescopic cover 7 is removed from the body panel 28. Then, when the hydraulic cylinder 25 is driven and the drive rod 25r projects from the cylinder body 25c, the support plate 21 is guided by the guide rails 20p and 20q to move rearward.
That is, the engine unit 2 installed on the support plate 21
And the counter weight 6 is displaced rearward together. Then, when the support plate 21 moves to the rearmost end shown by the phantom line in FIGS. 1 and 2, the engine unit 2 and the counterweight 6 are located at the maintenance position Pm.
FIG. 3 shows that the support plate 21 at the storage position Pr has the stroke L.
The state has been moved to the maintenance position Pm, which is rearward by s.

Therefore, according to the backhoe 1a according to the present embodiment, in addition to ensuring the compactness required for this type of construction machine, the engine unit 2 and the cab 1
Between the four, a sufficient space for inspection or repair, etc. is secured as necessary, so that maintainability is improved, and workability and work efficiency at the time of inspection or repair are improved. Can be

In this embodiment, since the engine unit 2 and the counterweight 6 are displaceably supported at the rear of the construction machine main body M, the positional adjustment of the counterweight 6 can be easily performed. Therefore, for example, when the front part of the construction machine main body M becomes heavy by changing the bucket part 18 to a large type or attaching an optional unit to the bucket part 18, the hydraulic cylinder 25 is driven and the support plate part is By moving the rearward by a predetermined stroke and locking the position, the weight balance between the front and rear of the construction machine main body M can be balanced. As described above, the main configuration of the present embodiment can also be used as a balance adjustment mechanism for adjusting the weight balance before and after the construction machine main body M. In addition, since the heavy engine unit 2 is displaced together, the engine unit 2 itself can also serve as the counterweight 6.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The detailed configuration, shape, and the like can be arbitrarily changed, added, or deleted without departing from the gist of the present invention.

For example, in the above embodiment, when the support plate 21 is moved, the support plate 21 is moved in parallel along the guide rails 20p, 20q. However, as shown in FIG. It may be displaced. That is, the support plate 2
1 is mounted on the support base 4 via the rotating shaft 31, and the rear end of the cylinder body 25 c of the hydraulic cylinder 25 is mounted on the chassis 13 via the rotating shaft 32. The connecting member 33 may be fixed to the tip of the drive rod 25r, and the connecting member 33 may be connected to the support plate 21 via the rotating shaft 34. Therefore, in this case, the guide rails 20p and 20q shown in FIG. 3 are unnecessary.

In the above-described embodiment, the hydraulic cylinder 25 is used to move the support plate 21. However, as shown in FIG. 5, the support plate 21 may be moved by the manual operation unit 5b. . In this case, one end of the ball screw portion 36n of the ball screw mechanism portion 36 is connected to the connecting portion 26 of the support plate portion 21, and the ball nut portion 36 screwed to the ball screw portion 36n is attached to the chassis portion 13.
j is rotatably supported by the nut support portion 37. The driven bevel gear 38 is attached to one end of the ball nut portion 36j.
And an operation handle 40 disposed at a right angle to the ball screw 36n is rotatably mounted on the chassis 13 so as to mesh with the driven bevel gear 38 at the inner end of the shaft of the operation handle 40. Drive side bevel gear 39 to be fixed. Thus, if the operation handle portion 40 is rotated, the ball nut portion 36j is rotated, and the ball screw portion 36n can be moved forward and backward in the axial direction, that is, the support plate portion 21 can be moved in the front-rear direction. In this case, the operation handle portion 40 may be rotated by an oil motor, an electric motor, or the like instead of the operation handle portion 40. 4 and 5, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the configuration is clarified.

Further, in the above embodiment, the engine unit 2 and the counterweight 6 are installed together on the support plate 21, but only the engine unit 2 may be displaced by installing only the engine unit 2. . Also, the backhoe 1a is illustrated, but the present invention can be applied to any traveling hydraulic construction machine such as a crane.

[0024]

As described above, the present invention provides a traveling hydraulic construction machine in which an engine unit including a hydraulic pump is mounted and a hydraulic actuator is driven by pressure oil supplied from the engine unit. On the supporting base portion, an operating portion for displacing the engine unit while supporting the displacing at least at the storage position and the maintenance position is provided.

In addition to ensuring the miniaturization and compactness required for construction equipment, at the time of maintenance, it is possible to secure a sufficient space between the engine unit and the operator's cab when performing inspections or repairs, thereby improving maintainability. Thereby, workability and work efficiency at the time of inspection or repair can be improved.

According to a preferred embodiment, by supporting the engine unit and the counter weight together on a support base provided at the rear of the construction machine main body so as to be displaceable, the weight balance between the front and rear of the construction machine main body can be easily achieved. It can be used for a balance adjustment mechanism, such as balancing, and
Since the heavy engine unit is also displaced together, the engine unit itself can also function as a counterweight.

[Brief description of the drawings]

FIG. 1 is a side view of a backhoe (a traveling hydraulic construction machine) according to a preferred embodiment of the present invention;

FIG. 2 is a partial plan view of the backhoe,

FIG. 3 is an explanatory view of an operation of a main part of the backhoe,

FIG. 4 is a schematic plan view of a main part of a backhoe according to a modification of the present invention,

FIG. 5 is a schematic plan view of a main part of a backhoe according to another modification of the present invention,

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling hydraulic construction machine 1a Backhoe 2 Engine unit 3a ... Hydraulic actuator 4 Support base part 5a ... Operation part M Construction machine body Pr Storage position Pm Maintenance position

Claims (4)

[Claims] 1. A traveling hydraulic construction machine in which an engine unit including a hydraulic pump is mounted and a hydraulic actuator is driven by pressurized oil supplied from the engine unit, wherein the engine unit is mounted on a support base of a construction machine body. A traveling hydraulic construction machine, comprising: an operation unit that displaceably supports at least a storage position and a maintenance position and displaces the engine unit. 2. The engine unit and a counterweight are displaceably supported together on the support base provided at a rear portion of the construction machine main body.
The traveling hydraulic construction machine as described. 3. The traveling hydraulic construction machine according to claim 1, wherein an upper portion of the engine unit is covered by a telescopic cover. 4. The traveling hydraulic construction machine according to claim 1, wherein the traveling hydraulic construction machine is applied to a backhoe.