JPH11336124A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting work for a fastening plate of a locking device and to improve workability during assembly. SOLUTION: A fastening plate 28 of a locking device 23 is mounted on the rear side leg 13 of a cab supporting member 11. One assembly can be formed by the cab supporting member 11, an engine cover 16 and a switchgear and the fastening plate 28 of the locking device 23. In this way, before the locking device 23 is assembled in a swivel frame, a position of mounting the fastening plate 28 to the switchgear 24 can be adjusted, so that adjusting work can be easily done in a wide space and workability be improved during assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic excavator, and more particularly, to a construction machine having an engine cover on a rear side of a frame.

[0002]

2. Description of the Related Art In general, a swing type construction machine such as a hydraulic shovel is known as a construction machine. And a working device provided on the front side of the upper rotating body.

[0003] In addition, hydraulic excavators that constitute a swing type construction machine include an in-vehicle swing type and an ultra-small swing type swing excavator (hereinafter, referred to as a small swing hydraulic excavator). A cab provided on the front side of the frame and covering at least the upper side of the driver's seat, an engine mounted on the rear side of the frame, and the cab provided on the rear side of the frame across the engine. A cab support member that supports the engine, an engine cover that is arranged to cover the engine, and that is openably and closably connected to the cab support member via a rotation connector, and a lock that holds the engine cover in a closed state. And a counter weight for balancing with a working device is provided at a rear end of the turning frame.

Here, in the small turning hydraulic excavator, the turning frame becomes smaller as the turning radius becomes smaller.
The engine is arranged in a horizontal state extending in the left-right direction near the rearmost portion of the turning frame, and a counterweight is formed in an arc shape so as to cover a lower portion of the engine.

[0005] The locking device comprises an opening / closing device provided on the distal end side of the engine cover and having a hook, and a stopper engaged by the hook of the opening / closing device when the engine cover is closed. The top of the counterweight,
Alternatively, it is attached to a bracket or the like extending from the turning frame.

[0006]

By the way, in the above-mentioned conventional hydraulic excavator, when the cab support member, the engine cover and the lock device are assembled to the upper revolving unit, the cab support member, the engine cover and the lock device are removed. The opening / closing device is assembled at another place, and separately from this, the stopper of the locking device is attached to the counterweight or the like.

However, when assembling the engine cover, the cab support member, and the lock device, or assembling the counterweight to the frame, there is a tolerance allowed for these members. A different displacement occurs between the counter weight and the counter weight for each assembly operation.

Therefore, after the assembly such as the engine cover and the cab support member is assembled to the revolving frame, the mounting position of the stopper mounted on the counterweight or the like is adjusted in accordance with the position of the hook of the opening / closing device. . For this reason, it is necessary to handle tools in a narrow work space around the engine, and there is a problem that the assembling workability is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to make it easier to attach a stopper of a lock device and to improve workability during assembly. To provide a construction machine that has been developed.

[0010]

A construction machine according to the present invention comprises a frame, a cab provided at a front side of the frame and covering at least a driver's seat, an engine mounted at a rear side of the frame, and A cab support member provided on the rear side of the frame across the engine to support the cab, and an engine disposed to cover the engine, and connected to the cab support member via a rotary connector so as to be openable and closable. A cover and a lock device for holding the engine cover closed.

Then, in order to solve the above-mentioned problem,
A feature of the configuration adopted by the invention according to claim 1 is that the locking device is provided with an opening / closing device provided on the tip end side of the engine cover and having a hook, and a hook of the opening / closing device provided on the cab support member when the engine cover is closed. And a stop which engages with the stop.

According to this structure, the cab support member, the engine cover, the opening / closing device of the lock device and the stopper can be integrally assembled before assembling to the construction machine. The mounting position can be easily adjusted in a large space.

According to a second aspect of the present invention, the cab support member includes a plurality of legs mounted on the frame at front and rear sides of the engine, and a support provided on each of the legs and mounted with the cab. Wherein the stopper of the locking device is provided on a leg of the leg which is arranged on the rear side of the engine.

With this configuration, the stopper can be provided using the legs of the cab support member, and in this state, the mounting position of the stopper with respect to the opening / closing device can be adjusted.

According to a third aspect of the present invention, the stopper of the locking device is constituted by a pedestal fixed to the cab support member and a striker attached to the pedestal and engaged with a hook.

With this configuration, the striker can be attached to the cab support member via the pedestal, for example, by fixing the pedestal to the cab support member by fixing means such as welding.

According to a fourth aspect of the present invention, a cover support rod for supporting the engine cover is disposed between the opening / closing device of the lock device and the stopper so as to be able to engage and disengage when the engine cover is opened. It is in.

With this configuration, it is possible to provide a cover supporting rod for supporting the engine cover with the door opened by using the opening / closing device of the lock device and the stopper.

Further, as in the fifth aspect of the present invention, the cab may be a box-shaped cab box surrounding the driver's seat or a canopy located above the driver's seat and protruding forward.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which an engine cover device of a construction machine according to an embodiment of the present invention is applied to a small-turn hydraulic excavator will be described in detail with reference to FIGS.

Reference numeral 1 denotes a lower traveling body, and 2 denotes an upper revolving body which is mounted on the lower traveling body 1 so as to be pivotable.
A cab box 4 as a cab provided on the left front side of the revolving frame 3, and an engine 5 disposed in a horizontal position extending in the left-right direction near the rearmost portion of the revolving frame 3. (Shown in FIG. 3) and an arc-shaped counter weight 6 provided at the rear end of the turning frame 3 and covering a lower portion of the engine 5. A working device 7 for performing work or the like is provided so as to be able to move up and down.

Here, the cab box 4 has a driver's seat 8
And an operation lever 9 and the like are provided in front of the driver's seat 8. The cab box 4 has a front side attached to the revolving frame 3 and a rear side attached to a support 15 of a cab support member 11 described later.

Further, on the right side of the turning frame 3, FIG.
As shown in FIG. 1, a side cover 10 is provided on the opposite side of the cab box 4 with the working device 7 interposed therebetween. The side cover 10 covers a hydraulic oil tank, various valve devices (not shown), and the like. A building cover is configured together with an engine cover 16 described later. And the upper revolving superstructure 2 configured as described above, when the upper revolving superstructure 2 is viewed from above,
It is formed in a substantially circular shape with respect to the center of rotation.

Numeral 11 denotes a cab support member provided on the rear side of the revolving frame 3. The cab supporting member 11 is mounted on the revolving frame 3 at a position in front of the engine 5 as shown in FIGS. The three front legs 12 and the engine 5
, Two rear legs 13 attached to the turning frame 3 at the rear side, and a beam portion 14 integrally connecting two of the front legs 12 and each rear leg 13. And each beam 1
4 and a support 15 extending in the left-right direction. And the cab support member 11
Is provided straddling the engine 5 and supports the rear portion of the cab box 4 on the support 15.

An engine cover 16 is located on the rear side of the turning frame 3 and is provided so as to cover the engine 5. The engine cover 16 extends from the rear of the cab box 4 toward the counterweight 6, and Weight 6
And a reinforcing frame 16B provided along the inner surface of the resin cover body 16A, and the resin cover body 16A.
An opening 16C is provided in the center of the tip side of A. The engine cover 16 is connected to the cab support member 11 via a rotation connector 17 described later so as to be openable and closable.

Reference numeral 17 denotes a rotary connecting member provided between the cab support member 11 and the reinforcing frame 16B of the engine cover 16, and the rotary connecting member 17 extends to the reinforcing frame 16B of the engine cover 16 in the left-right direction. Beam 18 attached thereto, an upper bracket 19 attached to both ends of the beam 18, and a lower bracket 20 attached to each beam portion 14 of the cab support member 11 facing each upper bracket 19. Rotating pieces 21 and 22 having both ends rotatably pin-connected to the upper bracket 19 and the lower bracket 20.
(Only one of them is shown).

As described above, the rotary connecting member 17 forms a link mechanism by the brackets 19, 20 and the rotary pieces 21, 22. The link mechanism connects the engine cover 16 to the cab support member 11 so as to be openable and closable. .

Reference numeral 23 denotes a lock device provided between the cab support member 11 and the engine cover 16. The lock device 23 includes an opening / closing device 24 and a stopper 28, which will be described later.

Reference numeral 24 denotes an opening / closing device provided on the tip end side of the engine cover 16. The opening / closing device 24 is provided at a position corresponding to the opening 16C of the engine cover 16 with a reinforcing frame 16B.
Mounted on The opening / closing device 24 has an opening 1
The handle 25 is roughly constituted by a handle 25 which is pulled through the handle 6C, and a hook 26 which is rotated by the operation of the handle 25 and engages with an engagement member 30B of a striker 30, which will be described later. As shown in FIG. 6, a locking piece 27 for locking the distal end side of the cover support bar 32 is attached to the opening / closing device 24.

Reference numeral 28 denotes the rear leg 13 of the cab support member 11.
The fixing member 28 is fixed to the rear leg 13 by fixing means such as welding, and is attached to the pedestal 29 having an L-shaped cross section extending in the left-right direction. And a striker 30. Here, as shown in FIG. 7, the striker 30 includes a rectangular base plate 30A, and a U-shaped engaging member 30B whose both ends are fixed to the base plate 30A.
It is bolted to the pedestal 29 via the base plate 30A so that the position can be adjusted.

Then, the stopper 28 is attached to the engine cover 1.
When the door 6 is closed, the hook 26 of the opening / closing device 24 is engaged with the engaging member 30B of the striker 30 to hold the engine cover 16 in the closed state.

Reference numeral 31 denotes a support piece provided on the pedestal 29 of the stopper 28. Reference numeral 32 denotes a cover support rod whose base end is freely attached to the support piece 31. The cover support rod 32 is shown in FIG. Thus, with the engine cover 16 opened,
The engine cover 16 is held in a door-open state by locking its distal end to a locking piece 27 provided in the opening / closing device 24, and maintenance work of the engine 5 is performed in this door-open state.

Here, the case of assembling the cab support member 11, the engine cover 16, and the lock device 23 will be described. In this case, the opening / closing device of the lock device 23 is connected to the cab support member 11 via the rotary connecting member 17. The cab support member 1 is connected to the engine cover 16 to which the cab support member 24 is attached.
A striker 30 is bolted to a pedestal 29 of a stopper 28 fixed to the rear leg 13 by welding means or the like. At this time, by disposing the engine cover 16 at the door closing position, the striker 3
The mounting position of the zero engaging member 30B can be adjusted.

In this manner, the cab support member 11, the engine cover 16, and the lock device 23 can be constituted as one assembly, and assembled to the turning frame 3 in this state.

The hydraulic excavator according to the present embodiment has the above-described configuration. Next, the opening and closing operation of the engine cover 16 will be described.

First, as shown in FIG. 3, the engine cover 16 is closed, and the hook 26 of the opening / closing device 24 is
By engaging the striker 30 of No. 8, the engine cover 16 can be kept in the closed state.

On the other hand, when the engine cover 16 is to be opened, a fingertip is hung on a handle 25 of the opening / closing device 24 and the handle 25 is pulled toward the front so that the hook 26 can be opened.
Can be rotated to release the engagement with the striker 30. In this state, by rotating the engine cover 16 so as to lift it, the engine cover 16 can be opened as shown in FIG.

When the engine cover 16 is opened, the distal end of the cover support rod 32 is locked by a locking piece 27 provided on the opening / closing device 24, so that the engine cover 16 is opened. Can be held.

As described above, according to the present embodiment, since the stopper 28 of the lock device 23 is attached to the rear leg 13 of the cab support member 11, the cab support member 11, the engine cover 16, the lock One assembly can be constituted by the opening and closing device 24 and the stopper 28 of the device 23. Thus, before the cab support member 11, the engine cover 16, and the lock device 23 are assembled to the turning frame 3, the mounting position of the stopper 28 with respect to the opening / closing device 24 can be adjusted. It can be easily carried out in a large space, and the opening / closing device 24 excluding the assembly tolerance of the counterweight 6 and the like is excluded.
Displacement between the stopper 28 and the stopper 28 can be reduced, and workability during assembly can be improved.

Further, since the locking piece 27 is attached to the opening / closing device 24 and the cover support rod 32 is attached to the pedestal 29 of the stopper 28 via the supporting piece 31, the pedestal 29 of the opening / closing device 24 and the stopper 28 are attached. The cover support bar 32 can be disposed by utilizing the above, the number of parts can be reduced, and the space can be used effectively.

In the embodiment, the cab support member 1
Although the case where three front legs 12 and two rear legs 13 are provided has been described as an example, the present invention is not limited to this, and one or two front legs 12 are provided. Or four or more, and the rear leg 13 may be one or three or more.

In the embodiment, the engine cover 1
6 is constituted by the resin cover body 16A and the reinforcing frame 16B, but instead of this, for example,
The resin cover body 16A may be changed to a metal cover body,
If the metal cover has strength, the reinforcing frame 16B may be omitted.

Further, in the embodiment, the description has been given by taking the example of the rotary connecting member 17 forming the link mechanism. However, the present invention is not limited to this, and for example, another rotary connecting member such as a hinge may be used. You may.

Further, in the embodiment, the case where the stopper 28 is constituted by the pedestal 29 and the striker 30 has been exemplified. Instead, for example, a single striker is used as the stopper, and the striker is used as the cab support member 11. It is good also as a structure attached so that position adjustment is possible.

Furthermore, in the embodiment, the case where the box-shaped cab box 4 surrounding the driver's seat 8 is used as the cab has been described as an example. However, the present invention is not limited to this, and for example, FIG. As a modified example, a canopy 41 positioned above the driver's seat 8 and protruding forward may be used as the cab. In this case, the canopy 41 is attached to the support 15 of the cab support member 11. I just need.

[0046]

As described above in detail, according to the first aspect of the present invention, since the stopper of the lock device is provided on the cab support member, the cab support member, the engine cover,
Before assembling the locking device to the construction machine, the cab support member, the engine cover, the opening / closing device of the locking device and the stopper can be assembled as one assembly. Thereby, the work of adjusting the mounting position of the stopper with respect to the opening / closing device can be easily performed in a large space, and the workability during assembly can be improved.

According to the second aspect of the present invention, the cab support member is located at the front side and the rear side of the engine and is attached to the frame, and a plurality of legs are provided on each of the legs and the cab is attached. It is constituted by the support, and the stopper of the locking device is provided on the leg disposed on the rear side, so that the stopper can be provided using the leg of the cab support member, and in this state, the stopper for the opening and closing device can be provided. The mounting position of the stopper can be easily adjusted.

According to the third aspect of the invention, the stopper of the lock device is constituted by the pedestal fixed to the cab support member and the striker attached to the pedestal and the hook is engaged with the pedestal. Is fixed to the cab support member by a fixing means such as welding, so that the striker can be easily attached to the cab support member via the pedestal, and workability can be improved.

According to the fourth aspect of the present invention, the cover support rod for supporting the engine cover when the engine cover is opened is engaged between the opening / closing device of the lock device and the stopper.
Since it is arranged to be detachable, it is possible to provide a cover support bar using the opening and closing device of the lock device and the stopper,
The number of parts can be reduced and space can be used effectively.

According to the fifth aspect of the present invention, as the cab,
A box-shaped cab box surrounding the driver's seat or a canopy protruding forward and located above the driver's seat can be used.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a hydraulic shovel.

FIG. 3 is an enlarged cross-sectional view showing the engine cover device together with a cab and a counterweight, as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is a sectional view showing a state where the engine cover device is assembled.

FIG. 5 is an external perspective view showing a cab support member.

FIG. 6 is an enlarged sectional view showing a state where an engine cover of the engine cover device is opened, as viewed from the same position as in FIG. 3;

FIG. 7 is an enlarged perspective view showing a stopper.

FIG. 8 is a front view showing a hydraulic excavator according to a modification of the present invention.

[Explanation of symbols]

 Reference Signs List 3 Revolving frame 4 Cab box (cab) 5 Engine 8 Driver's seat 11 Cab support member 12 Front leg 13 Rear leg 15 Support 16 Engine cover 17 Rotating connector 23 Lock device 24 Opening / closing device 26 Hook 28 Stopper 29 Base 30 Striker 32 Cover support rod 41 Canopy (cab)

Continuing from the front page (72) Inventor Shinichi Sato 650 Kandamachi, Tsuchiura-shi, Ibaraki Pref.

Claims (5)

[Claims] 1. A frame, a cab provided at a front side of the frame and covering at least an upper side of a driver's seat, an engine mounted at a rear side of the frame, and provided over the frame at a rear side of the frame. A cab support member for supporting the cab, and arranged to cover the engine,
A construction machine comprising: an engine cover connected to the cab support member via a rotation connector so as to be openable and closable; and a lock device for holding the engine cover in a closed state, wherein the lock device includes the engine cover And an opening / closing device having a hook provided on the tip side of the cab, and a stopper provided on the cab support member and engaging with the hook of the opening / closing device when the engine cover is closed. machine. 2. The cab support member comprises a plurality of legs mounted on the frame at front and rear sides of an engine, and a support provided on each of the legs and to which the cab is mounted. 2. The construction machine according to claim 1, wherein the stopper of the locking device is provided on a leg of the leg that is disposed on a rear side of an engine. 3. 3. The locking device according to claim 1, wherein the locking device comprises a pedestal fixed to the cab support member and a striker attached to the pedestal and engaged with the hook. Construction machinery. 4. A cover support rod for supporting the engine cover when the engine cover is opened is disposed between the opening and closing device of the lock device and the stopper so as to be engaged and disengaged. Item 6. The construction machine according to item 1, 2, or 3. 5. The construction machine according to claim 1, wherein the cab is a box-shaped cab box surrounding a driver's seat or a canopy located above the driver's seat and protruding forward.