JP4535087B2 - Work machine - Google Patents

Description

  The present invention relates to a work machine such as a hydraulic excavator.

  The conventional technology and its problems will be described using a hydraulic excavator as an example.

  FIG. 5 shows a small hydraulic excavator called a mini excavator. In this hydraulic excavator, an upper swing body 2 is mounted on a crawler type lower traveling body 1 so as to be rotatable about a vertical axis, and a boom 3, an arm 4, a bucket 5 and a boom for driving them are mounted on the upper swing body 2. The working device A comprising the cylinders 6, 7, and 8 for the arms and buckets is mounted.

  The upper swing body 2 is configured by attaching a large number of components such as an engine and various devices and covers (exterior body) covering the engine, a driver's seat 10, a canopy 11 and the like to an upper frame 9 which is a substrate. Reference numeral 12 denotes a canopy front column that supports the canopy 11, 13 is a left column, and 14 is a right column.

  In such a hydraulic excavator, a configuration in which a member for attaching each component to the upper frame 9 is shared by a plurality of components is known.

  For example, in Patent Document 1, a canopy post, a radiator, and an engine cover are attached to a support member that is disposed so as to straddle the engine.

Further, a technique for attaching a duct for guiding cooling air passing through the radiator to a member for attaching the radiator is also known (for example, Patent Document 2).
Japanese Patent Laid-Open No. 10-331195 JP-A-9-193671

  However, all of the known techniques simply reduce the number of parts for mounting by sharing one mounting member for a plurality of components. In other words, since the most important and troublesome position management between components is necessary for each component as before, it does not contribute to the improvement of component assembly workability.

  Therefore, the present invention covers a bonnet that can be freely opened and closed while covering the engine from the back side among a large number of components attached to the upper frame, and covers a part of the muffler from above so as not to burn the operator during maintenance. The present invention provides a working machine that can share a single mounting member and simultaneously use the mounting member as a positioning member between the two of the two muffler covers that are mounted in a state.

  According to the first aspect of the present invention, an upper swing body is rotatably mounted on the lower traveling body, and an upper frame that constitutes the upper swing body has an engine, an openable / closable bonnet that covers the back side of the engine, In a working machine in which a muffler cover for covering an exhaust exhaust for an engine is installed in the vicinity of the bonnet, a mounting column is provided on the left and right sides of the rear portion of the upper frame, and a bonnet hinge serving as an opening / closing fulcrum of the bonnet The muffler cover is attached.

  According to a second aspect of the present invention, in the configuration of the first aspect, a side panel arranged on one side of the rear side adjacent to the bonnet is attached to the attachment column.

  According to the present invention, the mounting column is shared as a mounting member for the bonnet that covers the engine from the rear side and the muffler cover that covers the engine exhaust muffler in the vicinity of the bonnet, and at the same time, an appropriate gap is secured between the two. Therefore, it can also be used as a positioning member.

  As a result, the gap between the bonnet and the muffler cover can be easily managed, and the efficiency of assembling the two, and consequently the assembling work of the upper swing body can be greatly improved.

  According to the invention of claim 2, the mounting column can be shared as a mounting member for the side panel arranged adjacent to the left and right sides of the bonnet, and an appropriate gap is provided between the bonnet and the side panel. It can also be used as a positioning member for securing. For this reason, the clearance between the bonnet and the side panel can be easily managed, and the efficiency of the assembling work can be further improved.

  An embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, a radiator support 22 is provided on the right side (the upper side in FIG. 1) of the engine 21 and a mounting column 23 is provided on the left side as mounting members shared by a plurality of components at the rear portion of the upper frame 9. Each is provided.

  The components attached to the radiator support 22 and the attachment column 23 and their attachment structures are as follows.

(I) Radiator support 22
As shown in FIGS. 1 to 3, the radiator support 22 includes a radiator 24, a hydraulic oil tank 25, hinges 27 and 27 serving as opening / closing fulcrums of a right guard cover 26 as an exterior body, and cooling air to the radiator 24 and the guard cover. A cylindrical radiator duct 29 for guiding between 26 air ports (air inlets or outlets) 28, a canopy right column 30 for supporting the canopy 11 of FIG. 5 on the rear right side, and maintenance of the engine 21 mainly. For this purpose, a closing catch 32 for the bonnet 31 provided on the back side of the engine so as to be opened and closed, and a seat stand 33 on which the driver's seat 10 and the operation lever shown in FIG. In FIG. 2, 34 is a counterweight.

  The radiator support 22 is formed in a square frame shape as shown in FIG. 3, and guard cover hinges 27 and 27 are attached to the rear surface, the hydraulic oil tank 25 is attached to the front surface, and the lower end of the canopy right column 30 is attached to the upper surface.

  The radiator duct 29 has a horizontal mounting seat 35 on the upper side of the opening edge on the radiator 24 side and a downward engaging portion 36 on the lower side, and this engaging portion 36 faces upward on the bottom wall of the radiator support 22. A pair of front and rear first protrusions 37, 37 provided on the second protrusion 38, and a second protrusion 38 provided between the first protrusions 37, 37 so as to be displaced in the left-right direction with respect to the protrusions 37, 37. Inserted and engaged.

  In this state, the mounting seat 35 is fastened to the upper surface of the radiator support 22 with bolts or screws (not shown), whereby the radiator duct 29 is attached to the radiator support 22.

  In addition, when taking the side-by-side system in which an oil cooler is arranged along with the radiator 24, the radiator duct 29 is a common duct for these.

  The seat stand 33 has a right mounting portion 39 that protrudes horizontally on the right side of the upper end portion, and the right mounting portion 39 is fixed to the upper surface of the radiator support 22 with a bolt or a screw (not shown).

  With this configuration, the following operational effects can be obtained.

  (A) Since the radiator support 22 can be used as an attachment / positioning member for the guard cover hinges 27, 27 and the radiator duct 29, the radiator 24 and the air port of the guard cover 26 (the air inlet for the suction method and the air outlet for the discharge method) It becomes easy to manage the intervals.

  (B) Since the radiator support 22 can be used as a mounting / positioning member for the guard cover hinges 27 and 27 and the right canopy support 30, an opening (not shown) for passing the canopy right support 30 and the support 30 provided on the guard cover 26 ( Position management of holes or notches becomes easy.

(Ii) Mounting column 23
As shown in FIGS. 1, 2, and 4, the mounting column 23 is formed in an angle shape. A left side panel 41 arranged adjacent to the bonnet 31 and a muffler cover 43 covering the engine exhaust muffler 42 are attached.

  As shown in FIG. 4, the seat stand 33 is provided with a rear-facing mounting bracket 44 and a left-facing mounting bracket 45 at the upper left side, the mounting bracket 44 at the upper end of the mounting column 23 and the mounting bracket 45 at the left side. Each is bolted.

  The bonnet hinge 40 is attached to a hinge attachment portion 46 provided at the lower end portion of the attachment column 23.

  The left panel 41 has a mounting portion 47 on the inner side, and the mounting portion 47 is fixed to the mounting column 23 via a panel mounting bracket 48.

  The muffler cover 43 is attached to the attachment column 23 via the muffler cover attaching portion 49 in a state where the muffler cover 43 covers a part of the muffler 42 from above so that an operator is not burned during maintenance.

  With this configuration, the following operational effects can be obtained.

  (A) Since the attachment column 23 can be used as an attachment / positioning member for the bonnet hinge 40 and the left panel 41, management of the gap c (see FIG. 1) between the bonnet 31 and the left panel 41 is facilitated.

  (B) Since the attachment column 23 can be used as an attachment / positioning member for the bonnet hinge 40 and the muffler cover 43, the gap between the lower end of the bonnet 31 and the upper surface of the muffler cover 43 can be easily managed.

  That is, while the mounting column 23 is shared as a three-part mounting member of the bonnet 31, the left panel 41 and the muffler cover 43, at the same time, the gap between the bonnet 31 and the left panel 41 and the bonnet 31 and the muffler cover 43. It can also be used as a positioning member for keeping the gap between them properly.

  Therefore, the efficiency of the assembling work of the three parties, and consequently the assembling work of the upper swing body can be greatly improved.

  On the other hand, by attaching the right end of the seat stand 33 to the radiator support 22 and the left end to the mounting column 23, a gate-shaped mounting base B (see FIG. 2) is constituted by these three members. Since a plurality of components are intensively attached to B as described above, position management between the components to be attached becomes easy.

  In addition, since the right radiator support 22 and the left mounting column 23 are connected to each other by the seat stand 33, they are reinforced and stiffened to each other, and the mounting base B having high strength and rigidity is configured. Each component can be firmly and stably attached while being configured to be attached in a static manner.

  In this case, since the bonnet hinge 40 is attached to the attachment column 23 and the catch 32 is attached to the radiator support 22, the position (interval) between the hinge 40 and the catch 32 of the bonnet 31 can be easily managed.

  By the way, the present invention is suitable for a hydraulic excavator, in particular, a small excavator requiring a reduction in the number of components for mounting components due to space constraints. It can also be applied to other work machines such as machines.

It is a schematic horizontal sectional view of the upper swing body of the hydraulic excavator according to the embodiment of the present invention. It is the same rear view. It is a perspective view which shows the component attachment condition around the radiator support in the same embodiment. It is a perspective view which shows the component attachment condition around the attachment column in the same embodiment. 1 is a schematic side view of a hydraulic excavator to which the present invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper turning body 9 Upper frame 21 Engine 23 Mounting column 31 Bonnet 40 Bonnet hinge 41 Left panel 42 Engine exhaust muffler 43 Muffler cover

Claims (2)

  An upper revolving structure is mounted on the lower traveling structure so as to be able to swivel. An engine, an openable / closable bonnet that covers the back side of the engine, and an engine exhaust in the vicinity of the bonnet are mounted on the upper frame constituting the upper revolving structure. In a work machine to which a muffler cover covering the muffler is attached, a mounting column is provided on the left and right sides of the rear portion of the upper frame, and a bonnet hinge serving as an opening / closing fulcrum of the bonnet and the muffler cover are attached to the mounting column. A working machine characterized by that.   2. The work machine according to claim 1, wherein a side panel arranged on one side of the rear side adjacent to the bonnet is attached to the attachment column.

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