CN1304236C - Track frame for construction machines - Google Patents

Abstract

A track frame 11 is composed of a center frame with an upper revolving body attached in position through a barrel 13, right and left side frames 21, 21 positioned on the right and left sides of the center frame 12 and longitudinally extending, and adapted to have caterpillars attached thereto, and front legs 30 and rear legs 31 connecting the side frames 21 to the center frame 12. And, these front and rear legs 30, 31 are formed, for example, of circular hollow pipes, such that the cross-sectional shape of the upper side is inclined. This ensures that even if mud and soil splashed tend to adhere to and accumulate on the front and rear legs 30, 31 and the like, such mud and soil fall along the inclined cross-sectional shape thus, adhesion and accumulation of mud and soil is prevented.

Description

The bogie truck of vehicle for construction

Technical field

The present invention relates to be best suited for the travel bogie truck of vehicle for construction of part of bottoms such as similar hydraulic excavator, hydraulic lift.

Background technology

Usually, vehicle for constructions such as hydraulic excavator possess the crawler-mounted bottom part of travelling, by driving left and right sides crawler belt can stably travel on irregular ground such as area, hill path and muddy terrain (for example, real clear 62-59578 communique, the TOHKEMY 2000-230252 communique etc. opened of Japan).

The crawler-mounted bottom of this prior art part of travelling has: the bogie truck that left and right side frame that the center am rest of upper rotating body, the left and right sides that is positioned at this center am rest be separately installed with the crawler belt that extends at fore-and-aft direction is installed, is made of several shanks that left and right side frame and above-mentioned center am rest are linked together.

Also have, each bogie side frame of this bogie truck is provided with in a side of length direction and is used to support the rotatable floating roller bracket part of floating roller, is provided with at the opposite side of length direction to be used for the travel motor bracket part of HM Hydraulic Motor of usefulness of installations such as drive wheel.

And crawler belt is reeled and is installed in its length direction at bogie side frame is extended.By with the rotation of the fluid motor-driven drive wheel of the usefulness of travelling, make this crawler belt around bogie side frame, vehicle be advanced or retreat as around the movement.

But, in above-mentioned prior art, roll by crawler belt when travelling or the earth that spatters can be deposited on the bogie truck in areas such as mire.Therefore, the earth of accumulation not only hinders the flexible action of crawler belt, and these earth are still made dirty and damaged the reason of vehicle (the particularly bogie side frame of bogie truck and shank).

Therefore, in the prior art, make several shanks front and back that connect center am rest and bogie side frame leave certain intervals, by becoming the accumulating amount that the desilt groove then can reduce earth between the shank before and after making.

But, on the bogie truck of prior art, be tabular surface above the shank.Therefore, earth be easy to be deposited in shank above, after finishing digging operation etc., must carry out flushing operations such as water flushing in order to remove earth, there is the problem that expends a large amount of labours and time in this flushing operation.

On the other hand, as other prior art, known have, and is provided with the fender that is made of plate material etc. on bogie truck, by making this fender prevent the structure (for example, TOHKEMY 2001-18861 communique etc.) of the accumulation of sandy soil etc. in vibrations such as left and right directions.

But, in this occasion, except flat fender etc. must be set, also must be provided for making the vibrating mechanism of this fender vibration etc. in addition on bogie truck, exist component number to increase and problem that assembling operation efficient reduces.

Particularly, use small-sized hydraulic excavator etc., in order to realize miniaturization that bogie truck is very compact, thereby near the installing space etc. the crawler belt is very little, exists to be difficult to increase the problem that fender and so on is set.

Summary of the invention

The present invention is in view of above-mentioned problems of the prior art, its objective is when providing a kind of not fender etc. that assembling operation is simplified, adhering to and piling up of earth etc. can be prevented, thereby the bogie truck of the vehicle for construction of flushing operations such as water cleaning can be carried out simply.

In order to solve above-mentioned problem, the present invention is a kind of bogie truck that is applicable to vehicle for construction, and tool is extended and is separately installed with the left and right side frame of crawler belt and front and back shank that this left and right side frame is connected on the above-mentioned center am rest constitutes at fore-and-aft direction by the center am rest that upper rotating body is installed, the left and right sides that is positioned at this center am rest.

And the architectural feature that the present invention adopts is, in order to suppress adhering to of earth, above-mentioned shank forms top bevelled shape of cross section.

Use the bogie truck of this structure, when marshy area etc. travels, even because of crawler belt splashes earth on the bogie truck, landing that these earth also can be above shank (comprise plane of bending) along the dip plane and removing, thus can prevent that earth from adhering to, being deposited in the shank of bogie truck etc.

In addition, the present invention utilizes shape of cross section to have hollow tube circular-arc or the linearity dip plane to make shank.In this occasion, can use cross-sectional plane to make shank for hollow tubes such as circle, ellipse or general triangular, thereby above can preventing that earth from adhering to, being deposited in.

On the other hand, adopt the present invention, shank is to make shape of cross section form the hollow tectosome with circular-arc or linearity dip plane by sheet material being carried out bending machining.In this occasion, by sheet material being carried out the shank that bending machining can be made the hollow structure with circular-arc or linearity dip plane.Also have, for example make two sheet materials overlap the occasion of the shank of making hollow structure up and down, form the dip plane of circular-arc or linearity by the sheet material that makes upside, just can make earth landing downwards and remove and go to the outside, thereby can prevent adhering to and piling up of earth along the dip plane.

Also have, adopt the present invention, shank is as joint portion with center am rest one side that is connected on the center am rest and the cylindrical shell that is connected the joint portion of bogie side frame one side on the bogie side frame, utilizes casting method integrally formed.Like this, make the occasion of shank or sheet bending is processed the occasion of making shank compare, can reduce man-hour, thereby can reduce the manufacturing cost of each shank the processing of shank with cutting off hollow tubing.

Also have, adopt the present invention, shank is the structure that has a down dip from center am rest one side towards bogie side frame one side direction and extend.Like this, also earth can be discharged from the direction of tilt of center am rest one side towards bogie side frame one side along downward-sloping shank.

Also have, adopt the present invention, bogie side frame is by the central frame that extends at fore-and-aft direction, the floating roller bracket part that is provided with in length direction one side of this central frame, the motor bracket part that is provided with at the length direction opposite side of this central frame constitutes, and above-mentioned central frame is made the structure of the shape of cross section that has a down dip towards the lateral from the inboard of left and right directions.

Like this, on central frame, can form from the inboard of left and right directions towards the dip plane in the outside, owing to can making earth be discharged to the outside along this dip plane landing, so, even also can prevent adhering to of earth and pile up in bogie side frame one side.

Also have, adopt the present invention, bogie side frame is by the central frame that extends at fore-and-aft direction, the floating roller bracket part that is provided with in length direction one side of this central frame, the motor bracket part that is provided with at the length direction opposite side of this central frame constitutes, above-mentioned floating roller bracket part for the folding and unfolding of track tension setting device inner and middle part that be formed on left and right directions has the top and the oblique shape of cross section that tilts from the position at this top.

Like this, the floating roller bracket part can form from left and right directions middle part (top) towards about the dip plane in the outside, can be to its in-to-in simultaneously with the folding and unfolding of track tension setting device, can make earth along about the dip plane discharge.

Also have, adopt the present invention, each shank is made at left and right directions and is extended in parallel to each other and its front end is connected structure on the central frame of bogie side frame.Like this, shank before and after can making leaves a determining deviation with respect to the central frame of bogie side frame and sets in front and back, when utilizing these shanks to be connected bogie side frame on the center am rest, can will effectively utilize as the hole of shaking off earth between the shank of front and back with enough rigidity.

On the other hand, adopt the present invention, bogie side frame is by the central frame that extends at fore-and-aft direction, the floating roller bracket part that is provided with by flange connector in length direction one side of this central frame, length direction opposite side at this central frame constitutes by the motor bracket part that flange connector is provided with, its structure is, the shank of its front side extends and front end is connected on the central frame of above-mentioned bogie side frame to oblique the place ahead or at left and right directions among each shank, and the shank of its rear side is connected front end on the flange connector of above-mentioned central frame and motor bracket part one side to oblique rear extension.

Like this, shank before and after can making leaves a determining deviation towards flange connector one side of the central frame of bogie side frame and motor bracket part and sets in front and back, utilize these shanks, when can stably be connected bogie side frame on the center am rest, can will effectively utilize as the hole of shaking off earth between the shank of front and back.

Also have, adopt the present invention, bogie side frame is by the central frame that extends at fore-and-aft direction, the floating roller bracket part that is provided with by flange connector in length direction one side of this central frame, length direction opposite side at this central frame constitutes by the motor bracket part that flange connector is provided with, its structure is connected its front end on the floating roller bracket part of above-mentioned bogie side frame to the extension of oblique the place ahead for the shank of its front side among each shank, and the shank of its rear side is connected its front end on the flange connector of above-mentioned central frame and motor bracket part one side to oblique rear extension.

Like this, shank before and after can making increases at fore-and-aft direction towards flange connector one side of the floating roller bracket part of bogie side frame and motor bracket part and leaves spacing and set, utilize these shanks, when can stably be connected bogie side frame on the center am rest, can will effectively utilize as the hole of shaking off earth between the shank of front and back.

Also have, adopt the present invention, central frame forms the shape of cross section that has a down dip towards the lateral from the inboard of left and right directions.

Like this, on central frame, can form from the inboard of left and right directions towards the dip plane in the outside, owing to can making earth be discharged to the outside along this dip plane landing, so, even also can prevent adhering to of earth and pile up in bogie side frame one side.

Also have, the present invention can form different shape of cross section mutually with the shank of the front side among each shank and the shank of rear side.Like this, load that bogie truck bears respectively when travelling or during operation etc. can make the shank of front side and the shank of rear side form different cross sectional shapes respectively, thus can improve effectively bogie side frame and center am rest Joint strenght etc.

Also have, the present invention is that a kind of shank being provided with of the front side among each shank is used to support the structure that ejector dozer makes its rotary Support bracket.Like this, just the Support bracket that ejector dozer is used need be set on center am rest, can realize miniaturization thereby make center am rest become compact.

And then the present invention is that a kind of each shank that makes becomes the structure of the movable leg at the interval of the left and right directions between the tune-up center frame and bogie side frame changeably.In this occasion, when can utilize movable leg to carry out the width adjustment of bogie truck, can prevent from that earth from adhering to be deposited on the movable leg.

Description of drawings

Fig. 1 is the External view of small type hydraulic excavator that the bogie truck of the 1st embodiment of the present invention has been used in expression.

Fig. 2 is the block diagram that amplifies the bogie truck of expression the 1st embodiment.

Fig. 3 is the front elevation of the amplification of bogie truck shown in Figure 2.

Fig. 4 is the birds-eye view of bogie truck shown in Figure 2.

Fig. 5 is the amplification cross sectional drawing that the arrow V-V direction from Fig. 4 is amplified the bogie truck of being seen.

Fig. 6 amplifies the amplification cross sectional drawing of being seen with the arrow VI-VI direction of central frame part from Fig. 4.

Fig. 7 amplifies the amplification cross sectional drawing of being seen with the arrow VII-VII direction of floating roller bracket part from Fig. 4.

Fig. 8 is the amplification cross sectional drawing that amplifies the shank in the presentation graphs 4.

Fig. 9 is representing the cross sectional drawing of the shank of the 1st modified example with the essentially identical position of Fig. 8.

Figure 10 is representing the cross sectional drawing of the shank of the 2nd modified example with the essentially identical position of Fig. 8.

Figure 11 is representing the cross sectional drawing of the shank of the 3rd modified example with the essentially identical position of Fig. 8.

Figure 12 is representing the cross sectional drawing of the shank of the 4th modified example with the essentially identical position of Fig. 8.

Figure 13 is representing the cross sectional drawing of the shank of the 5th consolidation type with the essentially identical position of Fig. 8.

Figure 14 is the front elevation of the bogie truck of expression the 2nd embodiment.

Figure 15 is the birds-eye view of bogie truck shown in Figure 14.

Figure 16 is the front elevation of the bogie truck of expression the 3rd embodiment.

Figure 17 is the birds-eye view of bogie truck shown in Figure 16.

Figure 18 is the amplification cross sectional drawing of the front and back shank that the arrow XVIII-XVIII direction amplification from Figure 17 is seen with the front leg portions of the 3rd embodiment and back shank.

Figure 19 is the birds-eye view of the bogie truck of expression the 4th embodiment.

Figure 20 is the birds-eye view of partial cutaway of the bogie truck of expression the 5th embodiment.

Figure 21 is the block diagram of the bogie truck of expression the 6th embodiment.

Figure 22 is the birds-eye view of the bogie truck of expression the 6th embodiment.

Figure 23 is the section drawing of the horizontal direction of the center am rest in the amplification presentation graphs 22, bogie side frame, front leg portions, back shank etc. under clipped state.

The specific embodiment

Below, describe for example the travel situation of part of bottom that bogie truck with the vehicle for construction of embodiments of the invention is applied to hydraulic excavator in detail with reference to accompanying drawing.

Here, Fig. 1 to Fig. 8 represents the 1st embodiment of the present invention.Among the figure, 1 is the crawler-mounted bottom part of travelling, and this bottom part 1 of travelling has the bogie truck 11 that is made of center am rest 12 described later and bogie side frame 21 etc., is provided with floating roller 2 as free gear in length direction one side of bogie side frame 21.

Also have, be provided with as HM Hydraulic Motor (not shown) at the opposite side of the length direction of bogie side frame 21 and wait the chain wheel driving that drives to take turns 3 by the usefulness of travelling.The left and right crawler belt 4 (side only is shown among Fig. 1) that extends at the length direction of bogie side frame 21 is around being installed between this drive wheel 3 and the floating roller 2.And part 1 is travelled by on the way travelling with above-mentioned fluid motor-driven crawler belt 4 etc. in the bottom.

The 5th, rotatably carry upper rotating body on travelling part 1 in the bottom by revolving wheel 6, on this upper rotating body 5, be provided with the vehicle cab 7 of dividing operator's compartment, counterweight 8 etc.Also have, be provided with the apparatus for work 9 that for example shakes rod-type etc. in the front portion of upper rotating body 5 side, carry out the digging operation of sandy soil etc. by this apparatus for work 9.

On the other hand, travel in the bottom front side of part 1 is provided with ejector dozer that can fluctuate 10 as shown in Figure 1 etc.This ejector dozer 10 is the soil-shifting operation of carrying out sandy soil etc., ground grading operation etc.

The 11st, the bogie truck of present embodiment, to shown in Figure 5, this bogie truck 11 is made of center am rest l2 described later, the left and right side frame 21,21 that is positioned at these center am rest 12 left and right sides, front leg portions 30, the back shank 31 that these bogie side frames 21 are connected on the center am rest 12 as Fig. 2.

The 12nd, be positioned at the center am rest of bogie truck 11 middle parts, this center am rest 12 uses steel plates etc. to form roughly rectangular tabular respectively.This center am rest 12 is used for the middle upper plate 14 that the disc 13 of revolving wheel 6 is installed of a side in the above by being fixed with, have with the roughly the same shape of this upper plate 14 and in the lower plate 15 of above-below direction formations such as left side plate 16,16, header board 17 and back plate 18 in the face of this upper plate 14.

In this occasion, left side plate the 16, the 16th utilizes to be welded to connect at the left and right two ends of upper plate 14 and lower plate 15, and between left and right sides sealing upper plate 14 and the lower plate 15.Also have, header board 17 and back plate 18 are to utilize to be welded to connect at the forward and backward two ends of upper plate 14 and lower plate 15, and between front side and rear side sealing upper plate 14 and the lower plate 15.

Then, center am rest 12 is made flat boxlike tectosome by these upper plates 14, lower plate 15, left side plate 16,16, header board 17 and back plate 18.Also have, pass the middle part of upper plate 14 and lower plate 15 along the vertical direction and be provided for intermediate connector through hole 14A, the 15A of folding and unfolding in center am rest 12 such as (not shown).

19 are arranged on the installation bracket of the front end middle part of center am rest 12, and these installation bracket 19 usefulness welding methodes are connected the middle part of header board 17 grades, from center am rest l2 forward pleurapophysis come out.Then, the hydraulic actuating cylinder (end diagram) of ejector dozer shown in Figure 1 10 oscilaltions can be connected on the installation bracket 19 rotationally.

20, the 20th, a pair of Support bracket that is positioned at the left and right sides of installation bracket 19, is provided with at the front end of center am rest 12, this two Support brackets 20 use welding methodes and installation bracket 19 roughly the same header board 17 grades to be connected, and side direction is outstanding below tiltedly forward from center am rest 12.And the left and right supporting arms (not shown) that is arranged on the ejector dozer shown in Figure 1 10 can be connected on each Support bracket 20 respectively rotationally.

21,21 be arranged on the left and right sides of center am rest 12 and the left and right side frame that extends at fore-and-aft direction, to shown in Figure 7, this left and right side frame 21 is made of central frame 22 described later, floating roller bracket part 25 and motor bracket part 29 etc. as Fig. 2.Then, on bogie side frame 21, crawler belt 4 is installed between floating roller 2 and the drive wheel 3.

The 22nd, to the central frame of the fore-and-aft direction extension that constitutes bogie side frame 21 main parts, this central frame 22 is by bending to sheet metals such as steel plate Fig. 5 and as shown in Figure 6 roughly trapezoidal, forms the shape of cross section that side plate 22A, 22B top 22C and inclination board 22D by left and right sides constitute.

In this case, side plate 22A, 22B that central frame 22 is made about it are parallel to each other, and be longer than the size (big height dimension) of the side plate 22B in the outside in the size of the side plate board 22A of above-below direction left and right directions inboard (middle frame 12 1 sides) that extend, that be arranged in these side plates 22A, 22B.Therefore, the upper end of side plate 22A forms and to bend to roughly that vee shape is lambdoid top 22C, forms to oblique below bevelled inclination board 22D between this top 22C and the side plate 22B.

In addition, in the front portion of central frame 22, form the roughly dimetric window 22E of portion between the side plate 22B in the outside and inclination board 22D, the 22E of this window portion opens or closes with cover plate (not shown) etc.And, when giving track tension setting device 27 supplies described later or injecting lubricating grease, opening by above-mentioned cover plate under the state of the 22E of window portion, by the 22E of this window portion grease compressor grease (not shown) is waited in the insertion central frame 22.

The 23rd, a side flange connector of expression sealing central frame 22 length directions one side, the 24th, the opposite side flange connector of expression sealing central frame 22 length direction opposite sides.And plate materials such as flange connector 23,24 usefulness steel plates are made, and utilize welding to be connected to the front and back end of central frame 22.

Here, as shown in Figure 7, be provided with the circular fit hole 23A that penetrates flange connector 23 on flange connector 23, the rear end of track tension setting device 27 described later etc. are chimeric and be installed among this embedded hole 23A.Therefore, the rear end of track tension setting device 27 is in from the embedded hole 23A of flange connector 23 to the side-prominent state of central frame 22 1.So, the grease compressor grease that inserts from the 22E of window portion of foregoing central frame 22, the rear end by track tension setting device 27 is lubricated the injection operation of fat etc.

Also have, the width of flange connector 24 is made than the width of central frame 22, flange connector 23 wideer (size of left and right directions is bigger), and the front end of the back shank of narrating later 31 is connected the one side with the other end of central frame 22.

The 25th, be arranged on the floating roller bracket part of length direction one side of central frame 22 by flange connector 23, as shown in Figure 7, this floating roller bracket part 25 is lambdoid pentagon by sheet metals such as steel plate being bent to the top, form symmetrical shape of cross section, by about side plate 25A, 25A, top 25B and about inclination board 25C, 25C constitute.

In this case, floating roller bracket part 25, side plate 25A, the 25A about it is parallel to each other and direction extension up and down, and the middle part between these side plates 25A, 25A forms the roughly top 25B of inverted v-shaped sockdolager font.So, form to the left and right direction between this top 25B and each the side plate 25A and respectively towards oblique below bevelled inclination board 25C.

Also have, as shown in Figure 7, be provided with left and right sides floating roller guide rail 26,26 at the medial surface of each side plate 25A, these two floating roller guide rails 26 can support floating roller shown in Figure 12 movably along the length direction (fore-and-aft direction) of floating roller bracket part 25.

In addition, shown in the long and two-short dash line among Fig. 3, Fig. 7, be provided with track tension setting device 27 in floating roller bracket part 25, floating roller bracket part 25 is in order to form the symmetrical shape that is made of above-mentioned each side plate 25A, top 25B and the board 25C that respectively tilts to these track tension setting device 27 folding and unfoldings in inside.

Here, track tension setting device 27 has oil cylinder to inner repack with grease, is arranged on the tension adjustment spring (any one is all not shown) in this oil cylinder outside.And track tension setting device 27 is by floating roller shown in Figure 12 is applied along the tension force of the length direction of crawler belt 4, thereby carries out tension adjustment of crawler belt 4 etc.

On the other hand,, form as Fig. 2, edge shown in Figure 4 otch 25D of extending of U font roughly, be provided with the fringing plate 28 that projects upwards on every side at this otch 25D in the top of floating roller bracket part 25 25B one side.Like this, these otch 25D, fringing plate 28 compensation floating roller 2 shown in Figure 1 moving along the length direction (fore-and-aft direction) of bogie side frame 21.

The 29th, be arranged on the motor bracket part of the length direction opposite side of central frame 22 by flange connector 24, as Fig. 2, shown in Figure 3, form circular mounting hole 29A on this motor bracket part 29, the HM Hydraulic Motor of the usefulness of travelling (not shown) etc. is installed among this mounting hole 29A.And drive wheel 3 shown in Figure 1 drives by the HM Hydraulic Motor revolution of the usefulness of being travelled, and makes crawler belt 4 around the movement between drive wheel 3 and floating roller 2.

30, the 30th, the central frame 22 of bogie side frame 21 is connected the left and right sides front leg portions on the side plate 16 of center am rest 12, as shown in Figure 8, each front leg portions 30 uses cross-sectional plane to form as open circles tubing, and side becomes circular-arc and downward-sloping from the location bending of top 30A above it.

And, as Fig. 2 to shown in Figure 5, each front leg portions 30 between center am rest 12 and bogie side frame 21 to the left and right direction extend and intersect vertically with this bogie side frame 21.And an end (bottom) of front leg portions 30 utilizes the welding and the side plate 16 of center am rest 12 to link together.And the other end of front leg portions 30 (front end) as shown in Figure 5, to oblique below diagonally extending, utilizes the welding and the side plate 22A of central frame 22 to link together.

31, the 31st, compare with front leg portions 30 rear side, be connected between bogie side frame 21 and the center am rest 12 about the back shank, each back shank 31 uses with the roughly the same tubing of front leg portions shown in Figure 8 30 and forms, its cross-sectional plane is hollow circle.

And to shown in Figure 4, each back shank 31 is positioned at left and right directions and to oblique rear extension from the rear portion of center am rest 12 to the flange connector 24 of bogie side frame 21 as Fig. 2.Here, an end of each back shank 31 is connected the corner of the side plate 16 and 18 of the plates in back of center am rest 12.In addition, the other end of back shank 31 (front end) as shown in Figure 3, is positioned at oblique below and tilted rearward and extends, and is connected between the flange connector 24 of the rear side position of central frame 22 and motor bracket part 29.

32, the 32nd, left and right sides reinforced plate, this reinforced plate 32 are arranged between the central frame 22 of back shank 31 and bogie side frame 21.And, as shown in Figure 4, these reinforced plates 32 for the front end that remedies back shank 31 and and the rear side position of a framework 22 between the gap and be connected between the two, thereby increase Joint strenght between back shank 31 and the central frame 22.

The bogie truck 11 of the hydraulic excavator of present embodiment has aforesaid structure, next its effect is described.

At first, bogie truck 11 is by following component set-up: the center am rest 12 with the disc 13 that is used to install upper rotating body 5; Be positioned at the left and right sides of this center am rest 12 and the left and right side frame 21,21 that extends at fore-and-aft direction; Between each bogie side frame 21 and center am rest 12, leave a determining deviation and the front leg portions 30 that each bogie side frame 21 and center am rest 12 are linked together, back shank 31 at fore-and-aft direction.

And front leg portions 30 is between center am rest 12 and the bogie side frame 21, at left and right directions diagonally extending below tiltedly, and the front portion of its front end and central frame 22 links together.Then the mechanism of shank 31 is, between center am rest 12 and bogie side frame 21, to oblique rear and downward-sloping extension, its front end is connected on the flange connector 24 and central frame 22 of motor bracket part 29.

Therefore, front leg portions 30 and back shank 31 can be arranged on the position, front side of central frame 22 and flange connector 24 places of rear side in the mode that certain distance is left in front and back with respect to bogie side frame 21, can utilize these front leg portions 30 and back shank 31, bogie side frame 21 is rigidly connected with height with respect to center am rest 12.

Like this, just can center am rest 12 be arranged between the left and right side frame 21,21, when can improve the bulk strength of bogie truck 11 reliably, by making the whole lightweight that skeleton structure also can realize bogie truck 11 that forms with stable girder construction.

Also have, front leg portions 30 and back shank 31 use the tubing of open circles tubulars to make, and as shown in Figure 8, make that location bending from top 30A becomes circular-arc and downward-sloping structure above it.

Therefore, for example when marshy area etc. travels, if rolled earth or spattered earth by crawler belt 4, these earth are attached on front leg portions 30 and the back shank 31 and pile up.But, because front leg portions 30 and back shank 31 usefulness circular hollow tubing are made, so these earth can be discharged from an easy rate and make its shape of cross section landing downwards along front leg portions 30, back shank 31, thereby can prevent that earth from adhering to, being deposited on front leg portions 30, the back shank 31.

In addition, owing to 21 inclinations downwards of these front leg portions 30, back shank 31, so earth can be discharged along the direction of tilt of front leg portions 30, back shank 31 at an easy rate from center am rest 12 towards bogie side frame.And, as shown in Figure 4, between front leg portions 30, back shank 31, forming the spatial portion 33 of general triangular shape, also this spatial portion 33 can be effectively utilized as the hole of shaking off earth.

On the other hand, bogie side frame 21 is by following component set-up: the central frame 22 that extends at fore-and-aft direction, be arranged on the floating roller bracket part 25 of length direction one side of central frame 22, be arranged on the motor bracket part 29 of the length direction opposite side of central frame 22 by flange connector 24 by flange connector 23.

And, central frame 22 is made following structure: the side plate 22A that is positioned at the inboard of center am rest 12 1 sides among side plate 22A, the 22B about making extends to the position higher than the side plate 22B in the outside, when the upper end of side plate 22A is formed lambdoid top 22C, bevelled inclination board 22D below tiltedly is being set between the side plate 22B in this top 22C and the outside.

Therefore, even on the central frame 22 of bogie side frame 21, a side is from the inside line (top 22C) of left and right directions position laterally in the above, the dip plane that is formed by inclination board 22D.Therefore, earth of being rolled by crawler belt 4 etc. gives discharge from top 22C along inclination board 22D to outside landing, thereby can prevent that also earth from adhering to, being deposited in bogie side frame 21 1 sides.

Also have, as shown in Figure 7, the floating roller bracket part 25 of bogie side frame 21 is in order to form symmetrical shape with 27 folding and unfoldings of track tension setting device in inside, thereby become a side in the above, when the middle part of left and right directions has top 25B, be provided with the structure of oblique below bevelled inclination board 25C, 25C towards the left and right sides from the position of this top 25B.

Therefore, even in floating roller bracket part 25 1 sides, in the above a side also can from the midway location (top 25B) of left and right directions by inclination board 25C form towards about the dip plane in the outside, thereby earth can be discharged at an easy rate along these board 25C that tilts.Also have, can be masterlyly with 27 folding and unfoldings of track tension setting device in floating roller bracket part 25, thereby can successfully carry out the tension adjustment of crawler belt 4.

Like this, the bogie truck 11 of present embodiment, by making bogie side frame 21, front leg portions 30, back shank 31 form aforesaid shape of cross section, can prevent that earth from adhering to or be deposited in above them, thereby can be reduced at the back washing and cleaning operation that washes etc. of ends such as digging operation.

And, owing to can not want the fender etc. of available technology adopting, so, the problem of work efficiency reduction when increasing the assembling that brings etc. can be solved because of part count.Particularly,, can not want fender etc. yet and assembling operation is simplified, can improve retaining mud performance (discharging the operability of earth) with simple structure for realizing small type hydraulic excavator that miniaturization is done bogie truck 11 compact etc.

In addition, in the 1st above-mentioned embodiment, as shown in Figure 8, though the above-mentioned cross-sectional plane that is to use is the front leg portions 30 that circular hollow tube is made, but also can replace to, the 1st modified example as shown in Figure 9 is such, is that the hollow tube of general triangular shape is made the shank 41 of front side with cross-sectional plane.

In this case, because the cross-sectional plane of shank 41 is the general triangular shape, so top 41A can form the herringbone shape of acute angle shape, the both sides at this top 41 can form the downward-sloping inclination of linearity facial 41B, 41B.Therefore, the retaining mud performance of shank 41 can be improved, when improving rigidity, lightweight can be realized because of making hollow structure.

Also have, the 2nd modified example as shown in figure 10 is such, and also the hollow tube that can use cross-sectional plane to be reverse U shape is made shank 42.In this case, make the top 42A of shank 42 protrude chevron pointing, the both sides of this top 42A can form with circular-arc (protruding bending) tilt facial 42B, 42B of bevelled downwards.

Also have, the 3rd modified example as shown in figure 11 is such, and also the hollow tube that can use cross-sectional plane to be antiparallelogram is made shank 43.In this case, a side can form the very little top 43A of width on shank 43, and the both sides of this top 43A can form the downward-sloping inclination of linearity facial 43B, 43B.

On the other hand, the 4th modified example as shown in figure 12 is such, and also the hollow tube that can use cross-sectional plane to be asymmetrical shape is made shank 44.And, in this case, as top 44B, between this top 44B and the opposing party's side surface part 44C, can form the facial 44D of the downward-sloping inclination of linearity to the opposing party's side surface part 44C from top 44B with the upper end of a side side surface part 44A.

Have, the 5th modified example as shown in figure 13 is such again, also can use the hollow tube of cross-sectional plane ovalize to make shank 45.And these shanks 41～45 also are applicable to the described back of above-mentioned the 1st embodiment shank 31 (shown in Fig. 2, Fig. 4 etc.) certainly.

Secondly, Figure 14 and Figure 15 represent the 2nd embodiment of the present invention, and the feature of present embodiment is that by the shank oblique the place ahead extension from the center am rest side towards the bogie side frame side direction that makes the front side, the shank of rear side constitutes to oblique rear extension.In addition, in the present embodiment, give identical symbol to the inscape identical with above-mentioned the 1st embodiment, its explanation is omitted.

Among the figure, the bogie truck that adopts in the 51 expression present embodiments.The bogie truck 51 of present embodiment is substantially the same with the bogie truck 11 described in the 1st embodiment, is made of the center am rest of narrating later 52, left and right side frame 57,57, front leg portions 61, back shank 62 etc.

Here, center am rest 52 is substantially the same with the center am rest 12 described in the 1st embodiment, by disc 53, upper plate 54, lower plate (not shown) with through hole 54, about side plate 55 (only illustrating a side), header board 56 and back plate formations such as (not shown).And be provided with the installation bracket 19 of ejector dozer 10 usefulness and Support bracket 20 etc. in the front side of center am rest 52.

57,57 expression left and right side frames, this bogie side frame 57 is also made with the bogie side frame 21 described in the 1st embodiment substantially the samely, is made of central frame 58, floating roller bracket part 59 and motor bracket part 60 etc.

And the central frame 58 of present embodiment also has inclination board 58A identical with the central frame 22 described in the 1st embodiment etc.

61, the 61st, about front leg portions, the structure of this front leg portions 61 is substantially the same with the front leg portions 30 described in the 1st embodiment.But in the present embodiment, this front leg portions 61 is extended to oblique the place ahead towards the floating roller bracket part 59 of bogie side frame 57 from the side plate 55 of center am rest 52, utilizes welding that its front end is connected on the floating roller bracket part 59.

62, the 62nd, about back shank, this back shank 62 structure substantially the same with the back shank 31 described in the 1st embodiment.And the front end of back shank 62, links together with the rear side position and the flange connector 24 of central frame 58 towards the oblique rear extension of flange connector 24 1 side direction of bogie side frame 57 from the rear portion of center am rest 52.

Like this, the embodiment of this structure also can obtain the essentially identical action effect with above-mentioned the 1st embodiment.That is, because above-mentioned front leg portions 61 and back shank 62 made by the tubing of circle, so, earth is discharged along the shape of cross section landing downwards of front leg portions 61, back shank 62, can prevent that earth from adhering to and be deposited in front leg portions 61, back shank 62.And, particularly in the present embodiment, its structure is that front leg portions 61 is extended to oblique the place ahead, its front end is connected on the floating roller bracket part 59 of bogie side frame 57, back shank 62 is to oblique rear extension, and its front end is connected on the flange connector 24 of the rear side position of central frame 58 and motor bracket part 60 1 sides.

Therefore, front leg portions 61, back shank 62 can be arranged on make on the flange connector 24 of the floating roller bracket part 59 of bogie side frame 57 and motor bracket part 60 1 sides before and after between the distance left strengthen.Thereby, utilizing these front leg portions 61, back shank 62, bogie side frame 57 can be rigidly attached on the center am rest 52 with height.

And, as shown in figure 15, can be between left and right side frame 57,57, being arranged on these front leg portions 61 and back shank 62 with center am rest 52 is on the girder construction of roughly X font at center.Therefore, utilize front leg portions 61, back shank 62 can make and assemble the framed structure that makes bogie truck 51 monolithic stabilities.Also have, as shown in figure 15, between front leg portions 61 and back shank 62, can form the spatial portion 63 of general triangular shape, this spatial portion 63 can be effectively utilized as the hole of shaking off earth.

Secondly, Figure 16 to Figure 18 represents the 3rd embodiment of the present invention, and present embodiment is characterised in that: in the left and right directions extension that is parallel to each other, its front end is connected the central frame of bogie side frame and constitutes by the shank before and after making.In addition, in the present embodiment, the inscape identical with above-mentioned the 1st embodiment given identical symbol, and its explanation is omitted.

Among the figure, the bogie truck that adopts in the 71 expression present embodiments.The bogie truck 71 of present embodiment is substantially the same with the bogie truck 11 described in the 1st embodiment, and it is made of the center am rest of narrating later 72, left and right side frame 77,77, front leg portions 81, back shank 82 etc.

Here, center am rest 72 is substantially the same with the center am rest 12 described in the 1st embodiment, it by disc 73, according to upper plate 74, lower plate (not shown) that through hole 74 is arranged, about side plate 75 (only illustrating a side), header board 76 and back plate formations such as (not shown).And be provided with the installation bracket 19 of ejector dozer 10 usefulness and Support bracket 20 etc. in the front side of center am rest 72.

77,77 expression left and right side frames, this bogie side frame 77 is also made with the bogie side frame 21 described in the 1st embodiment substantially the samely, and it is made of central frame 78, floating roller bracket part 79 and motor bracket part 80 etc.And the central frame 78 in the present embodiment also has inclination board 78A identical with the central frame 22 described in the 1st embodiment etc.

81, the 81st, about front leg portions, the structure of this front leg portions 81 is substantially the same with the front leg portions 30 described in the 1st embodiment.From center am rest 72 towards bogie side frame 77 1 sides, at left cubic meter of stone diagonally extending below tiltedly upwards.And in the present embodiment, its unique point is, is connected with preceding upper plate 84 with the front side board 83A of lower plate 83 described later by making this front leg portions 81, forms to have shape of cross section shown in Figure 180.

82, the 82nd, about back shank, this back shank 82 structure substantially the same with the back shank 31 described in the 1st embodiment.But these back shanks 82 are arranged to the rear portion of center am rest 72 and the central frame 78 of bogie side frame 77 are coupled together, make between the two with front leg portions 81 substantially parallel to the left and right direction extend and to the inclination of oblique below.And present embodiment is characterised in that, is connected with rear upper plate 85 with the rear side board 83B of lower plate 83 described later by making this back shank 82, form have with different mutually this aspect of shape of cross section of front leg portions shown in Figure 180 81 on.

The 83rd, constitute the lower plate of a front leg portions 81 and back shank 82 parts, this lower plate 83 for example forms one with the lower plate (not shown) of center am rest 72 or forms separately.And as shown in figure 17, this lower plate 83 is by 77 front side board 83A, rear side board 83B that extend in parallel to each other and the notch recesses 83C that is arranged on the roughly U font between these front sides board 83A, rear side board 83B constitute from center am rest 72 towards bogie side frame.

Upper plate before 84 expressions, this preceding upper plate 84 constitutes front leg portions 81 with the front side board 83A of lower plate 83.Here, as shown in figure 18, preceding upper plate 84 is by with press-processing method steel plate etc. being bent to the trapezoidal shape of cross section that is made of front and back side plate 84A, 84B, top 84C and inclination board 84D that forms.

In this occasion, front and back side plate 84A, the 84B of preceding upper plate 84 are parastate ground mutually and extend along the vertical direction, and methods such as welding are used in the lower end of side plate 84A, 84B, are connected securely on the front side board 83A of lower plate 83.Therefore, preceding upper plate 84 constitutes front leg portions 81 with lower plate 83.

In addition, the length dimension that is positioned at the side plate 84A of front side among side plate 84A, 84B is done than the length longer (big height dimension) of rear side board 84B.And the upper end of side plate 84A bends to roughly vee shape, is lambdoid top 84C thereby form, and becomes the board of the oblique below of side direction linearity bevelled inclination backwards 84D between this top 84C and the side plate 84B.

85 expression rear upper plates, this rear upper plate 85 constitutes the portion of retreating 82 with the rear side board 83B of lower plate 83.Here, as shown in figure 18, rear upper plate 85 is lambdoid pentagon by with methods such as drawings steel plate etc. being bent to the top, forms by front and back side plate 85A, 85B, top 85C and tilts forward and back the shape of cross section of the front and back symmetry that board 85D, 85E constitute.

In this occasion, front and back side plate 85A, the 85B of rear upper plate 85 are parallel to each other, and almost have identical height and direction extension up and down, and methods such as the lower end use welding of side plate 85A, 85B are connected on the rear side board 83B of lower plate 83 securely.

And the centre portion between side plate 85A, the 85B of rear upper plate 85 becomes the roughly top 85C of vee shape sockdolager font, between this top 85C and front and back side plate 85A, the 85B, forms respectively to oblique below linearity bevelled inclination board 85D, 85E.

Like this, in the embodiment of this structure, also can obtain essentially identical action effect with above-mentioned the 1st embodiment.That is, because the preceding upper plate 84 of front leg portions 81 has the oblique below bevelled inclination board 84D of side direction backwards from top 84C, so, by earth being discharged, can prevent that earth is attached on the front leg portions 81 along this inclination board 84D.On the other hand and since the rear upper plate 85 of back shank 82 have from top 85C in front side, rear side below tiltedly bevelled inclination board 85D, 85E, so, by earth being discharged, can prevent that earth is attached on the shank 82 of back along this inclination board 85D, 85E.

But particularly in the present embodiment, front leg portions 81 and back shank 82 can be arranged to use jointly lower plate 83, are parallel to each other from central frame 78 1 sides of center am rest 72 to bogie side frame 77, and leave certain distance before and after making.Therefore, bogie side frame 77 and center am rest 72 can utilize these front leg portions 81 and back shank 82 with enough rigidly connected whiles, between front leg portions 81 and back shank 82, can form as the hole of shaking off earth by the notch recesses 83C that is located at the roughly U font on the lower plate 83.

Also have, the front side board 83A of front leg portions 81 by making lower plate 83 and preceding upper plate 84 assemble being connected up and down mutually, and the back shank 82 also rear side board 83B by making lower plate 83 and rear upper plate 85 assembles welding up and down mutually.And front leg portions 81 forms different shape of cross section mutually with back shank 82.Like this, make bogie truck 71 with in motion or the load of bearing respectively during operation corresponding, can make front leg portions 81 and back shank 82 form the cross sectional shape of required (suitably) respectively, can improve bogie side frame 77 effectively with respect to the Joint strenght of center am rest 72 etc.

Secondly, Figure 19 represents the 4th embodiment of the present invention, and present embodiment is characterised in that, has the structure that shank in the front side is provided with the Support bracket that ejector dozer uses.In addition, in the present embodiment, the inscape identical with above-mentioned the 1st embodiment given identical symbol, and its explanation is omitted.

Among the figure, the bogie truck that adopts in the 91 expression present embodiments.The bogie truck 91 of present embodiment is substantially the same with the bogie truck 11 described in the 1st embodiment, has left and right bogie side frame 21,21.But the bogie truck 91 of present embodiment is characterised in that the center am rest of narrating later 92 forms on this aspect of shape different with the 1st embodiment with front leg portions 96, back shank 97.

The 92nd, the center am rest that present embodiment adopts, this center am rest 92 is substantially the same with the center am rest 12 described in the 1st embodiment, by disc 93, upper plate 94, lower plate with through hole 94A, about side plate, header board and back plate formations such as (any one are all not shown).

But upper plate 94 lateral dimensions such as grade (size of left and right directions) of this center am rest 92 are done lessly, make it approach the outside dimension of disc 93.That is, center am rest 92 becomes the structure in the Width shortening of car.Also have,, be provided with installation bracket 95 in the middle part of left and right directions in the front side of center am rest 92.

In addition, the structure of this installation bracket 95 is substantially the same with the installation bracket 19 of described ejector dozer 10 usefulness of the 1st embodiment.Also have, the Support bracket described later 99 that supports ejector dozer 10 is separately positioned on the front leg portions of narrating later 96.

96, the 96th, about front leg portions, the structure of this front leg portions 96 is substantially the same with the front leg portions 30 described in the 1st embodiment.From the side of center am rest 92 towards the central frame 22 of bogie side frame 21 to the left and right direction extend.But the size of the front leg portions 96 of this occasion is done to such an extent that compare the longer of the 1st embodiment, is provided with Support bracket 99 described later in the middle part of length direction.

Also have, these front leg portions 96 are substantially the same with the shank 44 of the 4th modified example for example shown in Figure 12, and can use shape of cross section is trapezoidal formation such as polygon tubing.In the occasion of using this shank 44, the leading flank of front leg portions 96 can be connected with very big bonding area with Support bracket 99 described later.

97, the 97th, about back shank, the structure of this back shank 97 is substantially the same with the back shank 31 described in the 1st embodiment, from the rear portion of center am rest 92 towards the oblique rear extension of flange connector 24 1 side direction of bogie side frame 21.Also have, between the central frame 22 of the front end of back shank 97 and bogie side frame 21, be provided with the reinforced plate 32 identical with the 1st embodiment.

But the back shank 97 of present embodiment, its difference are to form the size longer than the back shank 31 of the 1st embodiment.Also have, between bogie side frame 21 and center am rest 92, be positioned at front leg portions 96 and 97 spatial portions 98 that form the general triangular shape of back shank, this spatial portion 98 is effectively as the hole of shaking off earth.

99, the 99th, be positioned at center am rest 92 the left and right sides, be arranged on a pair of Support bracket on the front leg portions 96, this Support bracket 99, the described Support bracket of its structure and the 1st embodiment 20 is substantially the same.

But, the Support bracket 99 of this occasion, its bottom is connected on the front leg portions 96 with welding method, and the oblique below of side direction is outstanding forward for its front end.And the left and right sides hold-down arm (not shown) that will be arranged on respectively on the ejector dozer shown in Figure 1 10 can be connected on each Support bracket 99 rotationally.

Like this, embodiment with this structure also can obtain the essentially identical action effect with above-mentioned the 1st embodiment, particularly in the present embodiment, because being Support bracket 99 with ejector dozer 10 usefulness, its structure is arranged on the front leg portions 96, so can access action effect as described below.

That is, because Support bracket 99 that will ejector dozer 10 usefulness is arranged on the center am rest 99, so, can make the lateral dimension of upper plate 94 grades of center am rest 92 do lessly so that its outside dimension near disc 93.Like this, center am rest 92 is shortened on the Width of car as far as possible, thereby can realize small-sized, lightweight.

In addition, make and between bogie side frame 21 and center am rest 92, intersect vertically by front leg portions 96 being made the structure of extending with this center am rest 92 at left and right directions (also can be downward-sloping), so, can make the hold-down arm of ejector dozer 10 grades be easy to realize that with Support bracket 99 bearing pin combines, thereby can improve the operating efficiency when assembling.

Secondly, Figure 20 represents the 5th embodiment of the present invention, and the 5th embodiment of the present invention is characterised in that its structure is to make front leg portions and back shank become the flexible movable leg of direction to the left and right, can adjust the interval (width of car) between left and right side frame changeably.In addition, in the present embodiment, the inscape identical with above-mentioned the 1st embodiment given identical symbol, and its explanation is omitted.

Among the figure, the bogie truck that adopts in the 101 expression present embodiments.The bogie truck 101 of present embodiment is made of center am rest 102 described later, left and right side frame 106,106, preceding movable leg 110, back movable leg 111 etc.

Here, center am rest 102 has disc 103 etc., is provided with the installation bracket 19 of ejector dozer 10 usefulness and Support bracket 20 etc. in the front side of center am rest 102.But on center am rest 102, front and back are left certain intervals and are provided with guide cylinder 104,105 cylindraceous, in these guide cylinders 104,105, are inserted with movable leg 110,111 described later respectively slidably.Also have, be equipped with adjustment cylinder 112 described later 104,105 of forward and backward guide cylinders.

106, the bogie side frame about 106 expressions, this bogie side frame 106 is made of the bracket part 108 of central frame 107, floating roller and motor bracket part 109 etc.Also have, central frame 107 has inclination board 107A etc.

110, the 110th, about preceding movable leg, for example should before movable leg 110 make by the hollow tube of circle etc. corresponding to the guide cylinder 104 of center am rest 102 1 sides.Also have, preceding movable leg 110, one end (bottom) can be slidably inserted in the guide cylinder 104 of center am rest 102, and the other end (front end) uses welding method or bolt etc. to be fixed on the central frame 107 of bogie side frame 106.And, by making adjustment cylinder 112 expanding-contracting actions described later, preceding movable leg 110 with respect to the guide cylinder 104 of center am rest 102 in the horizontal direction (left and right directions) elongate or shorten.

111, the 111st, parallel with preceding movable leg 110 and left and right directions extend about back movable leg, the structure of this back movable leg 111 is identical with preceding movable leg 110.And back movable leg 111 one ends (bottom) can be slidably inserted in the guide cylinder 105 of center am rest 102, and the other end (front end) is fixed on the central frame 107 of bogie side frame 106.

Cylinders are adjusted in 112 expressions, and this adjustment cylinder 112 is between the guide cylinder 104,105 of center am rest 102 and be arranged between the left and right side frame 106,106.Here, adjust cylinder 112 and for example use formations such as hydraulic cylinder, by supplying with from the outside or discharge pressure liquid makes bar 112A flexible at left and right directions.

Then, when making the bar 112A elongation of adjusting cylinder 112, because preceding movable leg 110 is stretched out with the guide cylinder 104,105 of back movable leg 111 from center am rest 102, so it is big that the interval between center am rest 102 and the bogie side frame 106 becomes, bogie truck 101 single-piece width increase.

Also have, when the bar 112A that adjusts cylinder 112 was shortened, preceding movable leg 110 and back movable leg 111 shortened and include in the guide cylinder 104,105 of center am rest 102, and like this, the interval between center am rest 102 and the bogie side frame 106 dwindles, bogie truck 101 single-piece reduced width.

Like this, the embodiment with this structure also can obtain the essentially identical action effect with above-mentioned the 1st embodiment.But, particularly in the present embodiment, movable leg 110 and back movable leg 111 interval between tune-up center frame 102 and the bogie side frame 106 changeably before using, thus can successfully carry out bogie truck 101 single-piece width adjustment.

Secondly, Figure 21 to Figure 23 represents the 6th embodiment of the present invention, and present embodiment is characterised in that the front and back shank utilizes casting method to make.In addition, in the present embodiment, the inscape identical with above-mentioned the 1st embodiment given identical symbol, and its explanation is omitted.

Among the figure, the bogie truck that adopts in the 121 expression present embodiments.This bogie truck l21 is made of center am rest 12L described later, left and right side frame 129,129, front leg portions 135, back shank 136 etc.

The 122nd, the center am rest that present embodiment adopts, this center am rest 122 is substantially the same with the center am rest 12 described in the 1st embodiment, by the upper plate 124 of fixed disc body 123, lower plate 125, about side plate 126,126 header boards 127 and afterwards plate 128 etc. constitute.

But, this center am rest l22, its upper plate 124 and lower plate 125 are seen the formation hexagon from the top.And the side plate 126 in left side bends to the neighboring of rear side along disc 123 from the middle part of front and rear direction, and the side plate 126 on right side also bends to the neighboring of rear side along disc l23 from the middle part of front and rear direction.

129, the bogie side frame about 129 expressions, the described bogie side frame of this bogie side frame 129 and the 1st embodiment 21 is substantially the same, and it is made of the flange connector 131 of central frame 130, front side, rear side flange connector 132, floating roller bracket part 133, motor bracket part 134 etc.

But central frame 130 does more with the length that the central frame 22 of the 1st embodiment is compared its fore-and-aft direction, and floating roller bracket part 133 is done forr a short time with the length that the floating roller bracket part 25 of the 1st embodiment is compared its fore-and-aft direction.Also have, central frame 130 top identical with the 1st embodiment forms to the inclination of oblique below bevelled and pulls the 130A of portion.

135, the 135th, about front leg portions, this front leg portions 135 129 is extended to oblique the place ahead from center am rest 122 towards bogie side frame.Here, front leg portions 135 by the joint portion 135A that is connected center am rest one side on the center am rest 122, be connected the joint portion 135B of bogie side frame one side on the bogie side frame 129, the 135C of intermediate cylinder portion between the joint portion 135B of the joint portion 135A of center am rest one side and bogie side frame one side and constitute.

And, the joint portion 135A of front leg portions 135 its center am rest one sides, the joint portion 135B of bogie side frame one side, the 135C of intermediate cylinder portion utilize the casting method of having used cast steel material or welding cast iron (for example decarburization cast iron) material, and integrally formed as the mono-tubular.Also have, front leg portions 135 its cross-sectional planes are hollow shape, bend to circular-arc downward-sloping above it.

Here, the 135C of intermediate cylinder portion forms the drum of the cross-sectional plane with circle substantially the same with the front leg portions 30 of the 1st embodiment.Also have, the cross-sectional plane of the joint portion 135A of center am rest one side forms the trumpet-shaped hole enlargement cylinder that enlarges gradually from the 135C of intermediate cylinder portion diameter, utilizes to be welded to connect on the side plate 126 of center am rest 122.Also have, the cross-sectional plane of the joint portion 135B of bogie side frame one side forms the trumpet-shaped hole enlargement cylinder that enlarges gradually from the 135C of intermediate cylinder portion diameter, utilizes to be welded to connect on the central frame 130 of bogie side frame 129.

136, the 136th, about the back shank, this back shank 136 from center am rest 122 towards bogie side frame 129 to oblique rear extension.Here, back shank 136 by the joint portion 136A that is connected center am rest one side on the center am rest 122, be connected the joint portion 136B of bogie side frame one side on the flange connector 132 of bogie side frame 129 and rear side, the 136C of intermediate cylinder portion between the joint portion 136B of the joint portion 136A of center am rest one side and bogie side frame one side and constitute.And back shank 136 is the same with front leg portions 135, utilizes the casting method used cast steel material etc., and integrally formed as the mono-cylindrical shell.Also have, back shank 136 its cross-sectional planes are hollow shape, bend to circular-arc downward-sloping above it.

Here, the 136C of intermediate cylinder portion forms the drum of the cross-sectional plane with circle substantially the same with the front leg portions 30 of the 1st embodiment.Also have, the cross-sectional plane of the joint portion 136A of center am rest one side forms the trumpet-shaped hole enlargement cylinder that enlarges gradually from the 136C of intermediate cylinder portion diameter, utilizes to be welded to connect on the side plate 126 of center am rest 122.Also have, the cross-sectional plane of the joint portion 136B of bogie side frame one side forms the trumpet-shaped hole enlargement cylinder that enlarges gradually from the 136C of intermediate cylinder portion diameter, and utilization is welded to connect on the flange connector 132 of the central frame 130 of bogie side frame 129 and rear side.

Like this, the embodiment with this structure also can obtain the essentially identical action effect with above-mentioned the 1st embodiment.

But, in the present embodiment, cylindrical shell as the joint portion 135B of joint portion 135A with center am rest one side and bogie side frame one side, utilize the integrally formed front leg portions 135 of casting method, as the cylindrical shell of the joint portion 136B of joint portion 136A with center am rest one side and bogie side frame one side, utilize the integrally formed back of casting method shank 136.

Like this, for example with cut off that hollow tube forms the occasion of shank or occasion that bending machining sheet material forms shank is compared, owing to can reduce machining period, can reduce the manufacturing cost of these front leg portions 135, back shank 136 to front leg portions 135, back shank 136.

In addition, in above-mentioned the 5th embodiment, the circular hollow tube that is to use of narration is made preceding movable leg 110 and back movable leg 111.But the present invention is not limited to this, for example also can use the hollow tube with cross-sectional plane substantially the same with the shank 41～45 of the 1st～the 5th the modified example of Fig. 9～shown in Figure 13 to make movable leg.This point is also identical with the shank 61,62,81,82,96,97 described in the 2nd～the 4th embodiment of Figure 14～shown in Figure 19.

Also have, in above-mentioned the 1st embodiment, narration be with front leg portions 30 and afterwards shank 31 make identical shape of cross section.But also it can be replaced to the mutual different shape of cross section of shank before and after making, for example, front leg portions 81 as shown in figure 18 and back shank 82 grades are such, also can by two sheet materials are interconnected, combination, make hollow tectosome and constitute shank with chevron pointing top.The modified example of this point and the 1st～4th and the 2nd, embodiment of the 4th etc. are identical.

Also have, the shank 3O, 31,41～45,61,62,81,82,96 that uses in the various embodiments described above, 97 etc. also can be by carrying out the hollow tectosome that bending machining is made the dip plane with circular-arc or linearity to a sheet material.

Also have, in above-mentioned the 1st embodiment, though be that hydraulic excavator with form that operator's compartment 7 is set on upper rotating body 5 is the explanation that example is carried out, the present invention is not limited to this, for example, can certainly be applied to the hydraulic excavator of overhead guard formula that the upper section of operator's saddle is covered.This point is also identical with other embodiment.

The travel bogie truck of part of the bottom that the present invention is not limited to be applied to hydraulic excavator, the bottom that also can be widely used in other vehicle for constructions such as the hydraulic lift for example part of travelling are arranged again.

Claims (5)

1. the bogie truck of a vehicle for construction, it is by the center am rest that upper rotating body is installed, the left and right sides that is positioned at this center am rest is extended and is separately installed with the left and right side frame of crawler belt and front and back shank that this left and right side frame is connected on the above-mentioned center am rest constitutes at fore-and-aft direction, it is characterized in that:

Above-mentioned center am rest by upper plate, lower plate, about side plate, header board and back plate form roughly oblong or hexagonal tabular;

Above-mentioned bogie side frame is by the central frame that extends at fore-and-aft direction, and the floating roller bracket part that is provided with in length direction one side of this central frame constitutes by the motor bracket part that flange connector is provided with at the length direction opposite side of this central frame;

In order to suppress adhering to of earth, above making, the tubing that above-mentioned each shank utilizes shape of cross section to have the dip plane of circular-arc or linearity is formed obliquely;

Among above-mentioned each shank, front leg portions is to extend to oblique the place ahead or at left and right directions, and by welding the front side that bottom one side is connected left side plate, simultaneously, front end is connected on the central frame of above-mentioned bogie side frame, shank is to oblique rear extension thereafter, and bottom one side is connected the corner of rear side or the left side plate and the back plate of left side plate by welding, simultaneously, front end is connected structure on the flange connector of the rear side position of above-mentioned central frame and motor bracket part one side.

2, the bogie truck of vehicle for construction as claimed in claim 1 is characterized in that: be provided for supporting the rotary Support bracket of ejector dozer on the header board that constitutes above-mentioned center am rest.

3, a kind of bogie truck of vehicle for construction, it is by the center am rest that upper rotating body is installed, the left and right sides that is positioned at this center am rest is extended and is separately installed with the left and right side frame of crawler belt and front and back shank that this left and right side frame is connected on the above-mentioned center am rest constitutes at fore-and-aft direction, it is characterized in that:

Above-mentioned center am rest by upper plate, lower plate, about side plate, header board and back plate form roughly oblong or hexagonal tabular;

Above-mentioned bogie side frame is by the central frame that extends at fore-and-aft direction, and the floating roller bracket part that is provided with in length direction one side of this central frame constitutes by the motor bracket part that flange connector is provided with at the length direction opposite side of this central frame;

In order to suppress adhering to of earth, above-mentioned each shank is to utilize the joint portion of integrally formed joint portion with center am rest one side of casting method and bogie side frame one side and the cylindrical shell of the intermediate cylinder portion between them, the dip plane that the top formation of this cylinder is circular-arc;

Among above-mentioned each shank, its front leg portions is extended to oblique the place ahead or at left and right directions, and by welding the front side that center am rest one side joint portion is connected left side plate, simultaneously, the joint portion of bogie side frame one side is connected on the central frame of above-mentioned bogie side frame, thereafter shank is to oblique rear extension, and by welding the corner that central frame one side joint portion is connected rear side or the left side plate and the back plate of left side plate, simultaneously, the joint portion of bogie side frame one side is connected structure on the flange connector of the rear side position of above-mentioned central frame and motor bracket part one side.

4, the bogie truck of vehicle for construction as claimed in claim 3 is characterized in that: be provided for supporting the rotary Support bracket of ejector dozer on the header board that constitutes above-mentioned center am rest.

5, the bogie truck of vehicle for construction as claimed in claim 3, it is characterized in that: constitute the cross-sectional plane of the joint portion of the joint portion of center am rest one side of above-mentioned front leg portions and back shank and bogie side frame one side respectively, make the structure that forms the trumpet-shaped hole enlargement cylindrical shell that enlarges gradually from intermediate cylinder portion diameter.

Images