US20130149094A1 - Construction machine - Google Patents
Construction machine Download PDFInfo
- Publication number
- US20130149094A1 US20130149094A1 US13/696,466 US201113696466A US2013149094A1 US 20130149094 A1 US20130149094 A1 US 20130149094A1 US 201113696466 A US201113696466 A US 201113696466A US 2013149094 A1 US2013149094 A1 US 2013149094A1
- Authority
- US
- United States
- Prior art keywords
- hole
- center
- distance
- boom
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0808—Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/006—Pivot joint assemblies
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0808—Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures
- E02F9/0816—Welded frame structure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
- E02F9/12—Slewing or traversing gears
- E02F9/121—Turntables, i.e. structure rotatable about 360°
Definitions
- the present invention relates to construction machines such as a hydraulic excavator and, in particular, to a construction machine provided with a revolving frame formed by connecting a tail frame to a rear part side of a center frame.
- a hydraulic excavator as a typical example of a construction machine is largely constituted by a automotive lower traveling structure, an upper revolving structure that is rotatably mounted on the lower traveling structure and forms a vehicle body together with the lower traveling structure, and a working mechanism liftably provided on the front part side of the upper revolving structure.
- the upper revolving structure is formed of a revolving frame, a cab that is provided on a front left side of the revolving frame, an engine and a hydraulic pump mounted on a rear part side of the revolving frame, a housing cover that covers the engine and the like, and a counterweight that is provided on a back end portion of the revolving frame.
- the revolving frame of the upper revolving structure is composed of a center frame forming the center part of the revolving frame, a tail frame connected to the rear part side of the center frame, and left and right side frames provided on both the left and right sides sandwiching the center frame and the tail frame, for example (Patent Document 1).
- the center frame of the revolving frame is composed of a front bottom plate, left and right front vertical plates extending in the front and rear direction on the front bottom plate and erected in the left and right directions with an interval and the front part side is a bracket portion which pin-connects a boom of a working mechanism and a boom cylinder.
- the tail frame is composed of left and right I-section beams joined to the rear part of each front vertical plate and a rear bottom plate which connects each I-section beam to each other.
- the left and right I-section beams of the tail frame are formed of left and right rear vertical plates extending in the front and rear directions and having the front ends joined to each front vertical plate, an upper flange portion provided on the upper side of each rear vertical plate, extending in the front and rear directions and having the front end joined to each front vertical plate, and a lower flange portion provided on the lower side of each rear vertical plate, extending in the front and rear directions and having the front end joined to the front bottom plate.
- a boom pin through hole for performing pin-connection at a foot portion (base end portion) of the boom and a cylinder pin through hole for performing pin-connection of a base end portion of a boom cylinder are provided.
- the foot portion of the boom is rotatably (tiltably) mounted on the bracket portion of the center frame through a boom connecting pin inserted through the boom pin through hole
- the base end portion of the boom cylinder is rotatably mounted on the bracket portion of the center frame through a cylinder connecting pin inserted through the cylinder pin through hole.
- a distance between the foot portion of the boom and the base end portion of the boom cylinder is preferably large.
- a height dimension from the front bottom plate of the center frame to the foot portion of the boom that is, a height dimension from the front bottom plate of the center frame to the hole center of the boom pin through hole can be increased.
- the left and right front vertical plates including the bracket portion should have sufficient strength so as to bear a twisting moment applied from the boom or the like.
- Patent Document 2 discloses a configuration in which strength of the left and right front vertical plates is ensured by providing reinforcing members between the left and right front vertical plates and the front bottom plate.
- Patent Document 3 discloses a configuration in which strength of the front part sides of the left and right vertical plates is ensured by forming the front part sides of the left and right vertical plates (center beam) having a box shape.
- the present invention is applied to a construction machine comprising: a lower traveling structure; an upper revolving structure rotatably mounted on the lower traveling structure; and a working mechanism liftably provided on a front part side of the upper revolving structure, wherein a center frame of a revolving frame constituting the upper revolving structure is composed of a front bottom plate and left and right front vertical plates extending in the front and rear directions on the front bottom plate, erecting in the left and right directions with an interval, and having the front part side being a bracket portion for performing pin-connection of a boom of the working mechanism and a boom cylinder; a tail frame connected to a rear part side of the center frame is composed of left and right I-section beams joined to a rear part of each of the front vertical plates and a rear bottom plate connecting each of the I-section beams to each other; and the left and right I-section beams are formed of left and right rear vertical plates extending in the front and rear directions and
- a feature of the configuration adopted by the present invention is that a boom pin through hole performing pin-connection of a foot portion of the boom is provided on the bracket portion of the center frame; and supposing that a height dimension from the front bottom plate to a hole center of the boom pin through hole is (A) and a height dimension from the front bottom plate to the front end of the upper flange portion is (B), the height dimension (A) is set smaller than the height dimension (B).
- the height dimension from the front bottom plate to the foot portion of the boom can be reduced, and a twisting moment, a bending moment and the like applied to the left and right front vertical plates from the boom can be suppressed by that portion.
- a reinforcing member between the left and right front vertical plates and the front bottom plate or to constitute the front part sides of the left and right vertical plates (center beam) each having a box shape and the size and weight of the center frame can be reduced.
- the height dimension as the entire construction machine can be also reduced by which the height position of the foot portion of the boom can be reduced. Therefore, when a trailer on which the construction machine is loaded travels on a public road, the height dimension can be easily arranged within a range regulated by laws and regulations.
- a cylinder pin through hole performing pin-connection of the boom cylinder is provided in the bracket portion of the center frame on the front side of the boom pin through hole and at a position on the lower side; and supposing that a distance dimension between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole is (C) and a distance in the horizontal direction is (D) when the height dimension (A) is set smaller than the height dimension (B), and supposing that, as a comparison target, a distance dimension between the hole center of a cylinder pin through hole and the hole center of a boom pin through hole is (Cp) and a distance in the horizontal direction is (Dp) when a height dimension (Ap) from a front bottom plate to the hole center of the boom pin through hole is set larger than a height dimension (Bp) from the front bottom plate to the front end of the upper flange portion, the distance (D) is set larger than the distance (Dp) in accordance with a portion by which the
- the distance dimension (D) in the horizontal direction between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole is set larger in accordance with the portion by which the height dimension (A) from the front bottom plate to the hole center of the boom pin through hole is set smaller, the distance dimension (C) between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole can be ensured.
- the height dimension (A) from the front bottom plate to the hole center of the boom pin through hole is set smaller, the distance between the foot portion of the boom and the base end portion of the boom cylinder can be ensured, and the force of the boom cylinder can be effectively used.
- supposing that a distance between a center line (S-S) in the front and rear directions passing through the middle of the left front vertical plate and the right front vertical plate of the center frame and a revolving center (O) of the center frame is (E) when the height dimension (A) is set smaller than the height dimension (B), and supposing that, as a comparison target, a distance between a center line (Sp-Sp) in the front and rear directions passing through the middle of a left front vertical plate and the right front vertical plate of a center frame and a revolving center (Op) of the center frame is (Ep) when the height dimension (Ap) from the front bottom plate to the hole center of the boom pin through hole is set larger than the height dimension (Bp) from the front bottom plate to the front end of the upper flange portion, the distance (E) is set smaller than the distance (Ep).
- a cylinder pin through hole performing pin-connection of the boom cylinder is provided in the bracket portion of the center frame on the front side of the boom pin through hole and at a position on the lower side; and supposing that a distance dimension between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole is (C) and a distance in the horizontal direction is (D) when the height dimension (A) is set smaller than the height dimension (B), and that a distance between a center line (S-S) in the front and rear directions passing through the middle of the left front vertical plate and the right front vertical plate of the center frame and the revolving center (O) of the center frame is (E), supposing that, as a comparison target, a distance dimension between the hole center of the cylinder pin through hole and a hole center of the boom pin through hole is (Cp) and a distance in the horizontal direction is (Dp) when a height dimension (Ap) from a front bottom plate to the hole center of
- the present invention is arranged that a front plate extending in the left and right directions and connecting the left and right front vertical plates is provided on the front part sides between the left and right front vertical plates; and a first bent portion and a second bent portion bent at two spots in the front and rear directions are provided in the front plate.
- the front plate connecting the front part sides of the left and right front vertical plates is configured to be bent at two spots, strength of the front plate can be improved as compared with bending at one spot, and design freedom in an inclination angle of the front plate and the position relationship of the front end portion (lower end portion) of the front plate with respect to the swing circle and the like can be improved.
- FIG. 1 is a front view illustrating a hydraulic excavator according to an embodiment of the present invention.
- FIG. 2 is a plan view illustrating a single body of a revolving frame.
- FIG. 3 is a front view illustrating a state in which a swing circle is attached to the revolving frame shown in FIG. 2 .
- FIG. 4 is a front view illustrating a state in which the swing circle and a working mechanism are attached to the revolving frame shown in FIG. 2 .
- FIG. 5 is a right side view of FIG. 2 illustrating a single body of the revolving frame.
- FIG. 6 is a perspective view illustrating the revolving frame.
- FIG. 7 is an exploded perspective view illustrating the is revolving frame.
- FIG. 8 is a front view illustrating a center frame.
- FIG. 9 is a plan view of FIG. 8 illustrating the center frame.
- FIG. 10 is a front view illustrating the center frame according to a comparative example.
- FIG. 11 is a plan view of FIG. 10 illustrating the center frame according to the comparative example.
- a wheel-type hydraulic excavator as a typical example of a construction machine
- the hydraulic excavator 1 is largely constituted by an automotive wheel-type lower traveling structure 2 , an upper revolving structure 4 that is rotatably mounted on the lower traveling structure 2 through a swing circle 3 and forms a vehicle body together with the lower traveling structure 2 , and a working mechanism 5 liftably provided on the front part side of the upper revolving structure 4 .
- This wheel-type hydraulic excavator 1 runs on a public road by the wheel-type lower traveling structure 2 and performs earth and sand excavation and the like by using the working mechanism 5 at a work site.
- the lower traveling structure 2 is composed of a truck frame 2 A on which the swing circle 3 is mounted on the upper surface side and front and rear wheels 2 B provided on the truck frame 2 A and driven by a hydraulic motor (not shown).
- the lower traveling structure 2 is configured to travel on a public road, a work site and the like by driving each wheel 2 B.
- the upper revolving structure 4 is largely constituted by a revolving frame 11 , which will be described later, rotatably mounted on the truck frame 2 A of the lower traveling structure 2 through the swing circle 3 , a cab 6 provided on the front left side of the revolving frame 11 and defining a driver's room, a counterweight 7 provided on the rear end side of the revolving frame 11 and balancing a weight with the working mechanism 5 , a housing cover 8 provided on the front side of the counterweight 7 and accommodating an engine, a hydraulic pump and the like (none of them is shown), an operating oil tank 9 provided on the front side of the housing cover 8 , and a fuel tank 10 .
- the working mechanism 5 is composed of a lower boom 5 A having a base end side rotatably mounted in the upper and lower directions on the front part side of the revolving frame 11 as a boom, an upper boom 5 B rotatably mounted on a distal end side of the lower boom 5 A, an arm 5 C rotatably mounted on the distal end side of the upper boom 5 B, a bucket 5 D rotatably mounted on the distal end side of the arm 5 C, and various cylinders composed of left and right boom cylinders 5 E (only the right one is shown), a positioning cylinder 5 F, an arm cylinder 5 G, and a bucket cylinder 5 H.
- the revolving frame 11 is composed of four parts, each of which is integrally joined so as to form a single frame.
- the revolving frame 11 is composed of a center frame 12 located on the front center side, a tail frame 30 located on the rear center side, a left side frame 35 located on the left side sandwiching the center frame 12 and the tail frame 30 , and a right side frame 39 similarly located on the right side.
- Designated as 12 is the center frame constituting the center part of the revolving frame 11 , and the center frame 12 is largely constituted by a flat-plate shaped front bottom plate 13 , a left front vertical plate 14 and a right front vertical plate 17 extending in the front and rear directions on the front bottom plate 13 and erected with an interval in the left and right directions, a front plate 20 , which will be described later, located on the front part side of each of the front vertical plates 14 and 17 , extending in the left and right directions, and connecting each of the front vertical plates 14 and 17 to each other, a left cylinder mounting plate 21 and a right cylinder mounting plate 22 located on the front side of the front plate 20 , extending in the front and rear directions and erected on the front bottom plate 13 with an interval in the left and right directions.
- the front bottom plate 13 of the center frame 12 is the front bottom plate 13 of the center frame 12 , and the front bottom plate 13 is formed of a substantially rectangular thick steel plate, for example, and the swing circle 3 is mounted on the lower surface side thereof.
- a plurality of bolt insertion holes 13 A are provided in the front bottom plate 13 on the same circumference around the revolving center O, the swing circle 3 is mounted on the lower surface side of the front bottom plate 13 by using mounting bolts (not shown) inserted through each of the bolt insertion holes 13 A.
- a center hole 13 B through which a center joint (not shown) is inserted is provided in the front bottom plate 13 at a portion corresponding to the revolving center O.
- a revolving apparatus mounting hole 13 C on which a revolving apparatus (not shown) is mounted is provided on the rear side of this center hole 13 B.
- Designated at 14 is the left front vertical plate located close to the left side on the front bottom plate 13 and erected substantially perpendicularly so as to extend in the front and rear directions.
- This left front vertical plate 14 has the center part in the front and rear directions in the shape of a mountain protruding upward, and the front part side is constituted as a left bracket portion 14 A, which will be described later, for pin-connecting the lower boom 5 A of the working mechanism 5 and a left boom cylinder (not shown), respectively.
- This left bracket portion 14 A is located on the front part side of the left front vertical plate 14 and performs pin-connection between the lower boom 5 A and the left boom cylinder.
- the left bracket portion 14 A is composed of a left boom mounting plate portion 15 and a left cylinder mounting plate portion 16 , which will be described later.
- Indicated at 15 is the left boom mounting plate portion located on the upper part side part of the bracket portion 14 A of the left front vertical plate 14 , and the left boom mounting plate portion 15 rotatably supports (pin-connection) the foot portion (base end portion) of the lower boom 5 A through a boom connecting pin 27 , which will be described later.
- a left boom pin through hole 15 A through which the boom connecting pin 27 is inserted is provided on the left boom mounting plate portion 15 coaxially with a right boom pin through hole 18 A of a right boom mounting plate portion 18 , which will be described later.
- the left boom pin through hole 15 A is provided at a position lower than the front end of an upper flange portion 31 B of an I-section beam 31 constituting the tail frame 30 , which will lo be described later. That is, as illustrated in FIGS. 3 and 8 , supposing that a height dimension from the front bottom plate 13 to the hole center of the left boom pin through hole 15 A is A and a height dimension from the front bottom plate 13 to the front end of the upper flange portion 31 B is B, the height dimension A is set smaller than the height dimension B as shown in the following formula 1 .
- the left cylinder mounting plate portion 16 constituting the left bracket portion 14 A of the left front vertical plate 14 together with the left boom mounting plate portion 15 , and the left cylinder mounting plate portion 16 is located on the front side and the lower side of the left boom mounting plate portion 15 .
- This left cylinder mounting plate portion 16 rotatably supports (pin-connection) the base end portion (bottom portion) of the left boom cylinder through the left cylinder connecting pin (none of them is shown).
- a pair of left cylinder pin through holes 16 A and 21 A is provided coaxially in the left cylinder mounting plate portion 16 and the left cylinder mounting plate 21 , which will be described later, provided oppositely to the left bracket portion 14 A of the left front vertical plate 14 .
- These left cylinder pin through holes 16 A and 21 A support the left boom cylinder through the left cylinder connecting pin.
- Designated at 17 is the right front vertical plate provided with an interval in the left and right directions from the left front vertical plate 14 on the front bottom plate 13 .
- This right front vertical plate 17 is located close to the right on the front bottom plate 13 and erected substantially perpendicularly so as to extend in the front and rear directions.
- This right front vertical plate 17 has the center part in the front and rear directions in the shape of a mountain protruding upward similarly to the above-described left front vertical plate 14 , and the front part side is constituted as a right bracket portion 17 A for pin-connecting the lower boom 5 A and the right boom cylinder SE of the working mechanism 5 , respectively. That is, this right bracket portion 17 A is composed of the right boom mounting plate portion 18 , which will be described later, and a right cylinder mounting plate portion 19 .
- the right boom mounting plate portion located on the upper part side part of the right bracket portion 17 A of the right front vertical plate 17 and rotatably supports (pin-connection) the foot portion (base end portion) of the lower boom 5 A through the boom connecting pin 27 , which will be described later.
- the right boom pin through hole 18 A through which the boom connecting pin 27 is inserted is provided in the right boom mounting plate portion 18 coaxially with the left boom pin through hole 15 A of the left boom mounting plate portion 15 .
- the right boom pin through hole 18 A is also provided at a position lower from the front end of the upper flange portion 32 B of the I-section beam 32 constituting the tail frame 30 , which will be described later, similarly to the left boom pin through hole 15 A. That is, as illustrated in FIGS. 3 and 8 , supposing that a height dimension from the front bottom plate 13 to the hole center of the right boom pin through hole 18 A is A and a height dimension from the front bottom plate 13 to the front end of an upper flange portion 32 B is B, as shown in the formula 1, the height dimension A is set smaller than the height dimension B. As a result, the height dimension from the front bottom plate 13 to the foot portion of the lower boom 5 A can be reduced, and a twisting moment, a bending moment and the like applied from the lower boom 5 A to the right front vertical plate 17 can be suppressed.
- Indicated at 19 is the right cylinder mounting plate portion constituting the right bracket portion 17 A of the right front vertical plate 17 together with the right boom mounting plate portion 18 , and the right cylinder mounting plate portion 19 is located on the front side and also on the lower side of the right boom mounting plate portion 18 .
- This right cylinder mounting plate portion 19 rotatably supports (pin-connection) the base end portion (bottom portion) of the right boom cylinder 5 E through a right cylinder connecting pin 28 , which will be described later.
- a pair of right cylinder pin through holes 19 A and 22 A is coaxially and also coaxially with respect to the left cylinder pin through holes 16 A and 21 A provided in the right cylinder mounting plate portion 19 and the right cylinder mounting plate 22 , which will be described later.
- These right cylinder pin through holes 19 A and 22 A support the right boom cylinder 5 E through the right cylinder connecting pin 28 .
- the front plate 20 located on the front side of the front bottom plate 13 and connecting the left and right front vertical plates 14 and 17 , and the front plate 20 constitutes a part of the center frame 12 .
- the front plate 20 is formed as a three-face plate bent at two spots in the front and rear directions by applying bending to a plate material such as a steel plate and the like, for example.
- the front plate 20 is composed of a front surface portion 20 A erecting perpendicularly from the front bottom plate 13 , a first bending portion 20 B located on the upper end side of the front surface portion 20 A and bent toward the rear side, a first inclined portion 20 C continuing to the front surface portion 20 A through the first bending portion 20 B, a second bending portion 20 D located on the upper end side of the first inclined portion 20 C and bent toward the front side, and a second inclined portion 20 E continuing to the first inclined portion 20 C through the second bending portion 20 D.
- This front plate 20 had a lower end edge of the front surface portion 20 A joined to the upper surface of the front bottom plate 13 through welding means, a left end edge joined to the inner side surface of the left front vertical plate 14 , and a right end edge joined to the inner side surface of the right front vertical plate 17 .
- an opening 20 F is formed in the front plate 20 from the front surface portion 20 A to the first inclined portion 20 C, and the opening 20 F is an opening through which a hydraulic hose (not shown) for the working mechanism 5 , for example, passes.
- left and right cylinder mounting plates 21 and 22 which will be described later, are joined to the front surface of the front plate 20 from the front surface portion 20 A to the first inclined portion 20 C.
- the left cylinder mounting plate 21 provided on the left side front surface of the front plate 20 , and the left cylinder mounting plate 21 extends in the front and rear directions and is erected from the front bottom plate 13 to the first inclined portion 20 C of the front plate 20 .
- the left cylinder mounting plate 21 is opposed to the left cylinder mounting plate portion 16 provided on the left bracket portion 14 A of the left front vertical plate 14 .
- the left cylinder mounting plate 21 is joined to the left side upper surface of the front bottom plate 13 and the left side front surface of the front plate 20 by using the welding means.
- the left cylinder pin through hole 21 A through which the left cylinder connecting pin is inserted is provided in the front end portion of the left cylinder mounting plate 21 .
- This left cylinder pin through hole 21 A is arranged oppositely to the left cylinder pin through hole 16 A provided in the left cylinder mounting plate portion 16 .
- the right cylinder mounting plate 22 provided on the right side front surface of the front plate 20 , and the right cylinder mounting plate 22 extends in the front and rear directions and is erected from the front bottom plate 13 to the first inclined portion 20 C of the front plate 20 similarly to the above-described left cylinder mounting plate 21 .
- the right cylinder mounting plate 22 is opposed to the right cylinder mounting plate portion 19 and joined to the right side upper surface of the front bottom plate 13 and to the right side front surface of the front plate 20 by using the welding means.
- the right cylinder pin through hole 22 A through which the right cylinder connecting pin 28 is inserted is provided in the front end portion of the right cylinder mounting plate 22 , and this right cylinder pin through hole 22 A is arranged oppositely to the right cylinder pin through hole 19 A.
- Indicated at 23 and 24 are outside reinforcing plates provided on the outer side surfaces of the front portions of the left and right front vertical plates 14 and 17 , respectively, and each of the outside reinforcing plates 23 and 24 is joined to outer side surfaces of the portions (portions which become the left and right bracket portions 14 A and 17 A) where the boom pin through holes 15 A and 18 A and the cylinder pin through holes 16 A and 19 A are formed in the left and right front vertical plates 14 and 17 so as to increase the thicknesses of the portions.
- Indicated at 25 and 26 are inside reinforcing plates provided on the inner side surfaces of the upper, portions of the left and right front vertical plates 14 and 17 , and each of the inside reinforcing plates 25 and 26 is joined to inner side surfaces of portions (portions which become left and right boom mounting plate portions 15 and 18 ) where boom pin through holes 15 A and 18 A are formed in the left and right front vertical plates 14 and 17 so as to increase the thicknesses of the portions.
- Indicated at 27 is the boom connecting pin which rotatably supports the foot portion of the lower boom 5 A on the left and right boom mounting plate portions 15 and 18 , and the boom connecting pin 27 is inserted through the left and right boom pin through holes 15 A and 18 A.
- Indicated at 28 is the right cylinder connecting pin on the bottom side for rotatably supporting the base end portion (bottom portion) of the right boom cylinder 5 E between the right cylinder mounting plate portion 19 and the right cylinder mounting plate 22 , and the right cylinder connecting pin 28 is inserted through the right cylinder pin through holes 19 A and 22 A.
- indicated at 29 is the right cylinder connecting pin on the rod side for rotatably supporting the distal end side (rod side) of the right boom cylinder 5 E on the lower boom 5 A.
- This tail frame 30 is largely constituted by left and right I-section beams 31 and 32 , a rear bottom plate 33 , and a pair of lateral plates 34 , which will be described later.
- each of the I-section beams 31 and 32 is formed having an I-shaped section as a whole.
- Each of these I-section beams 31 and 32 is arranged on the rear side of the left and right front vertical plates 14 and 17 so as to extend in the front and rear directions with an interval in the left and right directions.
- the left I-section beam 31 is formed of a left rear vertical plate 31 A extending in the front and rear directions, the upper flange portion 31 B joined to the upper end edge of the left rear vertical plate 31 A by using the welding means and extending in the front and rear directions, and a lower flange portion 31 C joined to the lower end edge of the left rear vertical plate 31 A by using the welding means and extending in the front and rear directions.
- the right I-section beam 32 is also formed of a right rear vertical plate 32 A, the upper flange portion 32 B, and a lower flange portion 32 C similarly to the left I-section beam 31 .
- the front end side of the tail frame 30 is configured to be connected to the rear end portion of the center frame 12 by the welding means.
- the front end edge of each of the rear vertical plates 31 A and 32 A is joined to the rear end edge of each of the front vertical plates 14 and 17 , the front end portions of the upper flange portions 31 B and 32 B to the upper surface side on the rear end portion of each of the front vertical plates 14 and 17 , and the front end edges of the lower flange portions 31 C and 32 C and the front end edge of the rear bottom plate 33 , which will be described later, to the rear end edge of the front bottom plate 13 , respectively.
- the height dimension B of the front ends of the upper flange portions 31 B and 32 B is larger than the height dimension A of the boom pin through holes 15 A and 18 A (See Formula 1).
- Indicated at 33 is the rear bottom plate which connects the lower end sides of the left and right I-section beams 31 and 32 , and the rear bottom plate 33 is formed having a flat-plate shape by a steel plate or the like and joined to the lower flange portions 31 C and 32 C of each of the I-section beams 31 and 32 by using the welding means.
- Two openings 33 A and 33 B are formed in the rear bottom plate 33 and configured so that maintenance and the like of mounted equipment such as an engine or the like from the lower side of the upper revolving structure 4 through each of the openings 33 A and 33 B can be performed.
- Indicated at 34 are a pair of lateral plates which connect the I-section beams 31 and 32 at two spots in the intermediate portions of the left and right I-section beams 31 and 32 , and each of the lateral plates 34 is formed having a flat-plate shape by a steel plate and the like and joined to the upper surface of the rear bottom plate 33 and each of the vertical plates 31 A and 32 A, the upper flange portions 31 B and 32 B, and the lower flange portions 31 C and 32 C of each of the I-section beams 31 and 32 by using the welding means.
- Two each engine support brackets 34 A, totaling in four (See FIGS. 2 to 4 ), are provided on each of the lateral plates 34 , and each of the engine support brackets 34 A supports the engine through an antivibration mount (not shown).
- the left side frame 35 is composed of a left D-section frame 36 having a D-shaped section and extending in the front and rear directions, a plurality of left extension beams 37 provided between the left D-section frame 36 and the center frame 12 as well as the tail frame 30 and extending in the left and right directions, a cab support frame 38 which supports the cab 6 and the like.
- Designated at 39 is the right side frame mounted on the right side positions of the center frame 12 and the tail frame 30 , and the right side frame 39 is composed of a right D-section frame 40 having a D-shaped section and extending in the front and rear directions, a plurality of right extension beams 41 provided between the right D-section frame 40 and the center frame 12 as well as the tail frame 30 and extending in the left and right directions and the like.
- a center frame 12 ′ of the comparative example illustrated in FIGS. 10 and 11 has each of boom pin through holes 15 A′ and 18 A′ of left and right boom mounting plate portions 15 ′ and 18 ′ provided at positions higher than the front ends of upper flange portions 31 B′ and 32 B′ of I-section beams 31 ′ and 32 ′ constituting a tail frame 30 ′.
- the height dimension Ap is set larger than the height dimension Bp as shown in the following formula 2:
- the height dimension A is set smaller than the height dimension B as shown in the above-described formula 1.
- the horizontal direction distance D is set larger than a horizontal direction distance Dp of the configuration of the comparative example illustrated in FIGS. 10 and 11 as shown in the following formula 3:
- the horizontal direction distance D in this embodiment illustrated in FIG. 8 is set larger than the horizontal direction distance Dp in the comparative example (See Formula 3).
- the distance dimension C in this embodiment is set substantially equal to the distance dimension Cp in the comparative example. That is, in this embodiment, the horizontal direction distance D is set larger than the horizontal direction distance Dp by the comparative example in accordance with a portion by which the height dimension A is set smaller than the height dimension Ap (See Formula 3).
- the distance (distance dimension C) between the foot portion of the lower boom 5 A and the base end portion of each boom cylinder 5 E can be set larger, whereby the force of each boom cylinder 5 E can be effectively used.
- this distance E is set smaller compare to the distance Ep of the configuration of the comparative example illustrated in FIGS. 10 and 11 as shown in the following formula 4:
- the distance E in this embodiment illustrated in FIG. 9 is set smaller compare to the distance Ep in the comparative example (See Formula 4).
- balance (position relationship) between the left front vertical plate 14 and the right front vertical plate 17 with respect to the swing circle 3 can be made close to equal in the left and right directions, and torsion of the center frame 12 can be reduced.
- the hydraulic excavator 1 has the configuration as above, and this hydraulic excavator 1 travels to a work site by running on a public road or the like by using the lower traveling structure 2 and then, moving the working mechanism 5 upward/downward while revolving the upper revolving structure 4 so as to perform earth and sand excavation.
- the height dimension A from the front bottom plate 13 to the hole centers of the boom pin through holes 15 A and 18 A is set smaller than the height dimension B from the front bottom plate 13 to the front ends of the upper flange portions 31 B and 32 B of the I-section beams 31 and 32 .
- the height dimension from the front bottom plate 13 to the foot portion of the lower boom 5 A can be reduced, and a twisting moment, a bending moment and the like applied to the left and right front vertical plates 14 and 17 from the lower boom 5 A can be suppressed by that portion.
- the height dimension of the entire hydraulic excavator 1 can be reduced by the portion by which the height position of the foot portion of the lower boom 5 A can be reduced. Therefore, when a trailer on which the hydraulic excavator 1 is loaded runs on a public road, for example, this height dimension can be easily arranged within a range regulated by laws and regulations.
- the horizontal direction distance D between the hole centers of the left and right cylinder pin through holes 16 A, 21 A, 19 A and 22 A and the hole centers of the boom pin through holes 15 A and 18 A is set larger in correspondence with the portion by which the height dimension A from the front bottom plate 13 to the hole centers of the boom pin through holes 15 A and 18 A is set small. Therefore, in this embodiment the distance dimension C between the hole centers of each of the cylinder pin through holes 16 A, 21 A, 19 A, and 22 A and the hole centers of the boom pin through holes 15 A and 18 A can be secured large.
- the distance E between the center line S-S in the front and rear directions passing through the middle of the left front vertical plate 14 and the right front vertical plate 17 and the revolving center O of the center frame 12 is set small. Therefore, in this embodiment, balance (position relationship) between each of the left front vertical plate 14 and the right front vertical plate 17 with respect to the swing circle 3 can be made close to equal in the left and right directions. As a result, the swing circle 3 can receive the force applied from each of the front vertical plates 14 and 17 through the front bottom plate 13 in a state closer to equal in the left and right directions, and torsion of the center frame 12 can be reduced. That is, the center frame 12 can be configured advantageously in terms of strength.
- the front plate 20 connecting the front part sides between the left and right front vertical plates 14 and 17 is configured to be bent at two spots.
- strength of the front plate 20 can be improved more compare to the front plate 20 ′ formed by being bent at one spot as in the comparative example illustrated in FIGS. 10 and 11 .
- the present invention is not limited to the same, and can be applied to a hydraulic excavator provided with a mono-boom working device configured by a single boom, for example.
- the wheel-type hydraulic excavator 1 having the wheels 2 B was described as an example of a construction machine, but the present invention is not limited to the same, and can be applied to other construction machines such as a crawler-type hydraulic excavator and the like, for example.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Body Structure For Vehicles (AREA)
- Shovels (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
A revolving frame is composed of a center frame and a tail frame. The center frame is composed of a front bottom plate and left and right front vertical plates erected on the front bottom plate and having front part sides being left and right bracket portions performing pin-connection between a lower boom of a working mechanism and a boom cylinder. The tail frame is composed of left and right I-section beams and a rear bottom plate connecting each I-section beam to each other. A height dimension (A) between boom pin through holes provided in the bracket portions is set smaller than a height dimension (B) of the front end of an upper flange portion of the I-section beam.
Description
- The present invention relates to construction machines such as a hydraulic excavator and, in particular, to a construction machine provided with a revolving frame formed by connecting a tail frame to a rear part side of a center frame.
- Generally, a hydraulic excavator as a typical example of a construction machine is largely constituted by a automotive lower traveling structure, an upper revolving structure that is rotatably mounted on the lower traveling structure and forms a vehicle body together with the lower traveling structure, and a working mechanism liftably provided on the front part side of the upper revolving structure.
- The upper revolving structure is formed of a revolving frame, a cab that is provided on a front left side of the revolving frame, an engine and a hydraulic pump mounted on a rear part side of the revolving frame, a housing cover that covers the engine and the like, and a counterweight that is provided on a back end portion of the revolving frame.
- The revolving frame of the upper revolving structure is composed of a center frame forming the center part of the revolving frame, a tail frame connected to the rear part side of the center frame, and left and right side frames provided on both the left and right sides sandwiching the center frame and the tail frame, for example (Patent Document 1).
- In this case, the center frame of the revolving frame is composed of a front bottom plate, left and right front vertical plates extending in the front and rear direction on the front bottom plate and erected in the left and right directions with an interval and the front part side is a bracket portion which pin-connects a boom of a working mechanism and a boom cylinder. On the other hand, the tail frame is composed of left and right I-section beams joined to the rear part of each front vertical plate and a rear bottom plate which connects each I-section beam to each other.
- The left and right I-section beams of the tail frame are formed of left and right rear vertical plates extending in the front and rear directions and having the front ends joined to each front vertical plate, an upper flange portion provided on the upper side of each rear vertical plate, extending in the front and rear directions and having the front end joined to each front vertical plate, and a lower flange portion provided on the lower side of each rear vertical plate, extending in the front and rear directions and having the front end joined to the front bottom plate.
- Moreover, in regard to the bracket portion of the center frame, a boom pin through hole for performing pin-connection at a foot portion (base end portion) of the boom and a cylinder pin through hole for performing pin-connection of a base end portion of a boom cylinder are provided. The foot portion of the boom is rotatably (tiltably) mounted on the bracket portion of the center frame through a boom connecting pin inserted through the boom pin through hole, and the base end portion of the boom cylinder is rotatably mounted on the bracket portion of the center frame through a cylinder connecting pin inserted through the cylinder pin through hole.
- In order to effectively use the force of the boom cylinder, a distance between the foot portion of the boom and the base end portion of the boom cylinder is preferably large. In order to increase the distance, a height dimension from the front bottom plate of the center frame to the foot portion of the boom, that is, a height dimension from the front bottom plate of the center frame to the hole center of the boom pin through hole can be increased. In this case, the left and right front vertical plates including the bracket portion should have sufficient strength so as to bear a twisting moment applied from the boom or the like.
- On the other hand,
Patent Document 2 discloses a configuration in which strength of the left and right front vertical plates is ensured by providing reinforcing members between the left and right front vertical plates and the front bottom plate. Further,Patent Document 3 discloses a configuration in which strength of the front part sides of the left and right vertical plates is ensured by forming the front part sides of the left and right vertical plates (center beam) having a box shape. -
-
- Patent Document 1: Japanese Patent Laid-Open No. 2001-342646 A
- Patent Document 2: Japanese Patent Laid-Open No. Hei 10-37244 A
- Patent Document 3: Japanese Patent Laid-Open No. Hei 8-165679 A
- With regard to the conventional art according to
Patent Document 2, there is a concern that a weight of a revolving frame might be increased by provision of a reinforcing member. On the other hand, with regard to the conventional art according toPatent Document 3, since the front part sides of the left and right vertical plates (center beam) are formed having a box shape, there are problems in that the structure becomes complicated, and size and weight might be increased. - In view of the above-discussed problems with the conventional art, it is an object of the present invention to provide a construction machine which can constitute a small-sized and light-weighted center frame of a revolving frame.
- (1) In order to solve the above-described problems, the present invention is applied to a construction machine comprising: a lower traveling structure; an upper revolving structure rotatably mounted on the lower traveling structure; and a working mechanism liftably provided on a front part side of the upper revolving structure, wherein a center frame of a revolving frame constituting the upper revolving structure is composed of a front bottom plate and left and right front vertical plates extending in the front and rear directions on the front bottom plate, erecting in the left and right directions with an interval, and having the front part side being a bracket portion for performing pin-connection of a boom of the working mechanism and a boom cylinder; a tail frame connected to a rear part side of the center frame is composed of left and right I-section beams joined to a rear part of each of the front vertical plates and a rear bottom plate connecting each of the I-section beams to each other; and the left and right I-section beams are formed of left and right rear vertical plates extending in the front and rear directions and having front ends joined to each of the front vertical plates, an upper flange portion provided on the upper side of each of the rear vertical plates, extending in the front and rear directions, and having a front end joined to each of the front vertical plates, and a lower flange portion provided on the lower side of each of the rear vertical plates, extending in the front and rear directions and having the front end joined to the front bottom plate.
- A feature of the configuration adopted by the present invention is that a boom pin through hole performing pin-connection of a foot portion of the boom is provided on the bracket portion of the center frame; and supposing that a height dimension from the front bottom plate to a hole center of the boom pin through hole is (A) and a height dimension from the front bottom plate to the front end of the upper flange portion is (B), the height dimension (A) is set smaller than the height dimension (B).
- In this arrangement, the height dimension from the front bottom plate to the foot portion of the boom can be reduced, and a twisting moment, a bending moment and the like applied to the left and right front vertical plates from the boom can be suppressed by that portion. Thus, as in the conventional arts, it is no longer necessary to provide a reinforcing member between the left and right front vertical plates and the front bottom plate or to constitute the front part sides of the left and right vertical plates (center beam), each having a box shape and the size and weight of the center frame can be reduced. Moreover, the height dimension as the entire construction machine can be also reduced by which the height position of the foot portion of the boom can be reduced. Therefore, when a trailer on which the construction machine is loaded travels on a public road, the height dimension can be easily arranged within a range regulated by laws and regulations.
- (2) In the present invention, a cylinder pin through hole performing pin-connection of the boom cylinder is provided in the bracket portion of the center frame on the front side of the boom pin through hole and at a position on the lower side; and supposing that a distance dimension between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole is (C) and a distance in the horizontal direction is (D) when the height dimension (A) is set smaller than the height dimension (B), and supposing that, as a comparison target, a distance dimension between the hole center of a cylinder pin through hole and the hole center of a boom pin through hole is (Cp) and a distance in the horizontal direction is (Dp) when a height dimension (Ap) from a front bottom plate to the hole center of the boom pin through hole is set larger than a height dimension (Bp) from the front bottom plate to the front end of the upper flange portion, the distance (D) is set larger than the distance (Dp) in accordance with a portion by which the height dimension (A) is set smaller than the height dimension (Ap) so that the distance dimension (C) becomes substantially equal to the distance dimension (Cp).
- In this arrangement, since the distance (D) in the horizontal direction between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole is set larger in accordance with the portion by which the height dimension (A) from the front bottom plate to the hole center of the boom pin through hole is set smaller, the distance dimension (C) between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole can be ensured. As a result, even if the height dimension (A) from the front bottom plate to the hole center of the boom pin through hole is set smaller, the distance between the foot portion of the boom and the base end portion of the boom cylinder can be ensured, and the force of the boom cylinder can be effectively used.
- (3) In the present invention, supposing that a distance between a center line (S-S) in the front and rear directions passing through the middle of the left front vertical plate and the right front vertical plate of the center frame and a revolving center (O) of the center frame is (E) when the height dimension (A) is set smaller than the height dimension (B), and supposing that, as a comparison target, a distance between a center line (Sp-Sp) in the front and rear directions passing through the middle of a left front vertical plate and the right front vertical plate of a center frame and a revolving center (Op) of the center frame is (Ep) when the height dimension (Ap) from the front bottom plate to the hole center of the boom pin through hole is set larger than the height dimension (Bp) from the front bottom plate to the front end of the upper flange portion, the distance (E) is set smaller than the distance (Ep).
- In this arrangement, since the distance (E) between the center line (S-S) in the front and rear directions passing through the middle of the left front vertical plate and the right front vertical plate and the revolving center (O) of the center frame is set smaller, balance (position relationship) between the left front vertical plate and the right front vertical plate with respect to a swing circle provided between the upper revolving structure and the lower traveling structure can be made close to equal in the left and right directions. As a result, the swing circle can receive the force applied from the left and right front vertical plates through the front bottom plate in a state closer to equal in the left and right directions, and torsion of the center frame can be reduced (configuration can be made advantageous in terms of strength).
- (4) According to the present invention, a cylinder pin through hole performing pin-connection of the boom cylinder is provided in the bracket portion of the center frame on the front side of the boom pin through hole and at a position on the lower side; and supposing that a distance dimension between the hole center of the cylinder pin through hole and the hole center of the boom pin through hole is (C) and a distance in the horizontal direction is (D) when the height dimension (A) is set smaller than the height dimension (B), and that a distance between a center line (S-S) in the front and rear directions passing through the middle of the left front vertical plate and the right front vertical plate of the center frame and the revolving center (O) of the center frame is (E), supposing that, as a comparison target, a distance dimension between the hole center of the cylinder pin through hole and a hole center of the boom pin through hole is (Cp) and a distance in the horizontal direction is (Dp) when a height dimension (Ap) from a front bottom plate to the hole center of the boom pin through hole is set larger than a height dimension (Bp) from the front bottom plate to a front end of an upper flange portion, and that a distance between a center line (Sp-Sp) in the front and rear directions passing through the middle of a left front vertical plate and a right front vertical plate of a center frame and the revolving center (Op) of the center frame is (Ep), it is preferable that the distance (D) is set larger than the distance (Dp) and also, the distance (E) is set smaller than the distance (Ep) in accordance with a portion by which the height dimension (A) is set smaller than the height dimension (Ap) so that the distance dimension (C) becomes substantially equal to the distance dimension (Cp). As a result, the same effect as that in (2) and (3) can be obtained.
- (5) Further, the present invention is arranged that a front plate extending in the left and right directions and connecting the left and right front vertical plates is provided on the front part sides between the left and right front vertical plates; and a first bent portion and a second bent portion bent at two spots in the front and rear directions are provided in the front plate.
- In this arrangement, since the front plate connecting the front part sides of the left and right front vertical plates is configured to be bent at two spots, strength of the front plate can be improved as compared with bending at one spot, and design freedom in an inclination angle of the front plate and the position relationship of the front end portion (lower end portion) of the front plate with respect to the swing circle and the like can be improved.
-
FIG. 1 is a front view illustrating a hydraulic excavator according to an embodiment of the present invention. -
FIG. 2 is a plan view illustrating a single body of a revolving frame. -
FIG. 3 is a front view illustrating a state in which a swing circle is attached to the revolving frame shown inFIG. 2 . -
FIG. 4 is a front view illustrating a state in which the swing circle and a working mechanism are attached to the revolving frame shown inFIG. 2 . -
FIG. 5 is a right side view ofFIG. 2 illustrating a single body of the revolving frame. -
FIG. 6 is a perspective view illustrating the revolving frame. -
FIG. 7 is an exploded perspective view illustrating the is revolving frame. -
FIG. 8 is a front view illustrating a center frame. -
FIG. 9 is a plan view ofFIG. 8 illustrating the center frame. -
FIG. 10 is a front view illustrating the center frame according to a comparative example. -
FIG. 11 is a plan view ofFIG. 10 illustrating the center frame according to the comparative example. - Hereafter, a construction machine to be applied to an embodiment in the present invention will be in detail explained with reference to the accompanying drawings by taking a case in which the hydraulic excavator is applied as an example.
- In the figure, designated at 1 is a wheel-type hydraulic excavator as a typical example of a construction machine, and the
hydraulic excavator 1 is largely constituted by an automotive wheel-typelower traveling structure 2, an upper revolvingstructure 4 that is rotatably mounted on thelower traveling structure 2 through aswing circle 3 and forms a vehicle body together with thelower traveling structure 2, and aworking mechanism 5 liftably provided on the front part side of theupper revolving structure 4. This wheel-typehydraulic excavator 1 runs on a public road by the wheel-typelower traveling structure 2 and performs earth and sand excavation and the like by using theworking mechanism 5 at a work site. - Here, the
lower traveling structure 2 is composed of atruck frame 2A on which theswing circle 3 is mounted on the upper surface side and front andrear wheels 2B provided on thetruck frame 2A and driven by a hydraulic motor (not shown). Thelower traveling structure 2 is configured to travel on a public road, a work site and the like by driving eachwheel 2B. - The upper revolving
structure 4 is largely constituted by a revolvingframe 11, which will be described later, rotatably mounted on thetruck frame 2A of thelower traveling structure 2 through theswing circle 3, acab 6 provided on the front left side of the revolvingframe 11 and defining a driver's room, acounterweight 7 provided on the rear end side of the revolvingframe 11 and balancing a weight with theworking mechanism 5, ahousing cover 8 provided on the front side of thecounterweight 7 and accommodating an engine, a hydraulic pump and the like (none of them is shown), anoperating oil tank 9 provided on the front side of thehousing cover 8, and afuel tank 10. - Moreover, the
working mechanism 5 is composed of alower boom 5A having a base end side rotatably mounted in the upper and lower directions on the front part side of the revolvingframe 11 as a boom, anupper boom 5B rotatably mounted on a distal end side of thelower boom 5A, anarm 5C rotatably mounted on the distal end side of theupper boom 5B, abucket 5D rotatably mounted on the distal end side of thearm 5C, and various cylinders composed of left andright boom cylinders 5E (only the right one is shown), a positioningcylinder 5F, anarm cylinder 5G, and abucket cylinder 5H. - Subsequently, the configuration of the revolving
frame 11 used in this embodiment will be described. In this embodiment, the revolvingframe 11 is composed of four parts, each of which is integrally joined so as to form a single frame. - That is, as illustrated in
FIGS. 2 to 7 , the revolvingframe 11 is composed of acenter frame 12 located on the front center side, atail frame 30 located on the rear center side, aleft side frame 35 located on the left side sandwiching thecenter frame 12 and thetail frame 30, and aright side frame 39 similarly located on the right side. - Designated as 12 is the center frame constituting the center part of the revolving
frame 11, and thecenter frame 12 is largely constituted by a flat-plate shapedfront bottom plate 13, a left frontvertical plate 14 and a right frontvertical plate 17 extending in the front and rear directions on thefront bottom plate 13 and erected with an interval in the left and right directions, afront plate 20, which will be described later, located on the front part side of each of the frontvertical plates vertical plates cylinder mounting plate 21 and a rightcylinder mounting plate 22 located on the front side of thefront plate 20, extending in the front and rear directions and erected on thefront bottom plate 13 with an interval in the left and right directions. - Indicated at 13 is the
front bottom plate 13 of thecenter frame 12, and thefront bottom plate 13 is formed of a substantially rectangular thick steel plate, for example, and theswing circle 3 is mounted on the lower surface side thereof. Thus, as illustrated inFIG. 9 , a plurality ofbolt insertion holes 13A are provided in thefront bottom plate 13 on the same circumference around the revolving center O, theswing circle 3 is mounted on the lower surface side of thefront bottom plate 13 by using mounting bolts (not shown) inserted through each of thebolt insertion holes 13A. - Moreover, a
center hole 13B through which a center joint (not shown) is inserted is provided in thefront bottom plate 13 at a portion corresponding to the revolving center O. A revolvingapparatus mounting hole 13C on which a revolving apparatus (not shown) is mounted is provided on the rear side of thiscenter hole 13B. - Subsequently, the left front
vertical plate 14 constituting a part of thecenter frame 12 will be specifically described. - Designated at 14 is the left front vertical plate located close to the left side on the
front bottom plate 13 and erected substantially perpendicularly so as to extend in the front and rear directions. This left frontvertical plate 14 has the center part in the front and rear directions in the shape of a mountain protruding upward, and the front part side is constituted as aleft bracket portion 14A, which will be described later, for pin-connecting thelower boom 5A of the workingmechanism 5 and a left boom cylinder (not shown), respectively. - This
left bracket portion 14A is located on the front part side of the left frontvertical plate 14 and performs pin-connection between thelower boom 5A and the left boom cylinder. Thus, theleft bracket portion 14A is composed of a left boom mountingplate portion 15 and a left cylinder mountingplate portion 16, which will be described later. - Indicated at 15 is the left boom mounting plate portion located on the upper part side part of the
bracket portion 14A of the left frontvertical plate 14, and the left boom mountingplate portion 15 rotatably supports (pin-connection) the foot portion (base end portion) of thelower boom 5A through aboom connecting pin 27, which will be described later. Thus, a left boom pin throughhole 15A through which theboom connecting pin 27 is inserted is provided on the left boom mountingplate portion 15 coaxially with a right boom pin throughhole 18A of a right boom mountingplate portion 18, which will be described later. - Here, the left boom pin through
hole 15A is provided at a position lower than the front end of anupper flange portion 31B of an I-section beam 31 constituting thetail frame 30, which will lo be described later. That is, as illustrated inFIGS. 3 and 8 , supposing that a height dimension from thefront bottom plate 13 to the hole center of the left boom pin throughhole 15A is A and a height dimension from thefront bottom plate 13 to the front end of theupper flange portion 31B is B, the height dimension A is set smaller than the height dimension B as shown in the followingformula 1. As a result, a height dimension from thefront bottom plate 13 to the foot portion of thelower boom 5A can be reduced, and a twisting moment, a bending moment and the like applied from thelower boom 5A to the left frontvertical plate 14 can be suppressed. -
Height dimension A<Height dimension B [Formula 1] - Indicated at 16 is the left cylinder mounting plate portion constituting the
left bracket portion 14A of the left frontvertical plate 14 together with the left boom mountingplate portion 15, and the left cylinder mountingplate portion 16 is located on the front side and the lower side of the left boom mountingplate portion 15. This left cylinder mountingplate portion 16 rotatably supports (pin-connection) the base end portion (bottom portion) of the left boom cylinder through the left cylinder connecting pin (none of them is shown). Here, a pair of left cylinder pin throughholes plate portion 16 and the leftcylinder mounting plate 21, which will be described later, provided oppositely to theleft bracket portion 14A of the left frontvertical plate 14. These left cylinder pin throughholes - Subsequently, the right front
vertical plate 17 constituting a part of thecenter frame 12 will be specifically described. - Designated at 17 is the right front vertical plate provided with an interval in the left and right directions from the left front
vertical plate 14 on thefront bottom plate 13. This right frontvertical plate 17 is located close to the right on thefront bottom plate 13 and erected substantially perpendicularly so as to extend in the front and rear directions. This right frontvertical plate 17 has the center part in the front and rear directions in the shape of a mountain protruding upward similarly to the above-described left frontvertical plate 14, and the front part side is constituted as aright bracket portion 17A for pin-connecting thelower boom 5A and the right boom cylinder SE of the workingmechanism 5, respectively. That is, thisright bracket portion 17A is composed of the right boom mountingplate portion 18, which will be described later, and a right cylinder mountingplate portion 19. - Indicated at 18 is the right boom mounting plate portion located on the upper part side part of the
right bracket portion 17A of the right frontvertical plate 17 and rotatably supports (pin-connection) the foot portion (base end portion) of thelower boom 5A through theboom connecting pin 27, which will be described later. Thus, the right boom pin throughhole 18A through which theboom connecting pin 27 is inserted is provided in the right boom mountingplate portion 18 coaxially with the left boom pin throughhole 15A of the left boom mountingplate portion 15. - Here, the right boom pin through
hole 18A is also provided at a position lower from the front end of theupper flange portion 32B of the I-section beam 32 constituting thetail frame 30, which will be described later, similarly to the left boom pin throughhole 15A. That is, as illustrated inFIGS. 3 and 8 , supposing that a height dimension from thefront bottom plate 13 to the hole center of the right boom pin throughhole 18A is A and a height dimension from thefront bottom plate 13 to the front end of anupper flange portion 32B is B, as shown in theformula 1, the height dimension A is set smaller than the height dimension B. As a result, the height dimension from thefront bottom plate 13 to the foot portion of thelower boom 5A can be reduced, and a twisting moment, a bending moment and the like applied from thelower boom 5A to the right frontvertical plate 17 can be suppressed. - Indicated at 19 is the right cylinder mounting plate portion constituting the
right bracket portion 17A of the right frontvertical plate 17 together with the right boom mountingplate portion 18, and the right cylinder mountingplate portion 19 is located on the front side and also on the lower side of the right boom mountingplate portion 18. This right cylinder mountingplate portion 19 rotatably supports (pin-connection) the base end portion (bottom portion) of theright boom cylinder 5E through a rightcylinder connecting pin 28, which will be described later. Here, a pair of right cylinder pin throughholes holes plate portion 19 and the rightcylinder mounting plate 22, which will be described later. These right cylinder pin throughholes right boom cylinder 5E through the rightcylinder connecting pin 28. - Subsequently, indicated at 20 is the front plate located on the front side of the
front bottom plate 13 and connecting the left and right frontvertical plates front plate 20 constitutes a part of thecenter frame 12. Here, thefront plate 20 is formed as a three-face plate bent at two spots in the front and rear directions by applying bending to a plate material such as a steel plate and the like, for example. - Specifically, the
front plate 20 is composed of afront surface portion 20A erecting perpendicularly from thefront bottom plate 13, afirst bending portion 20B located on the upper end side of thefront surface portion 20A and bent toward the rear side, a firstinclined portion 20C continuing to thefront surface portion 20A through thefirst bending portion 20B, asecond bending portion 20D located on the upper end side of the firstinclined portion 20C and bent toward the front side, and a secondinclined portion 20E continuing to the firstinclined portion 20C through thesecond bending portion 20D. Thisfront plate 20 had a lower end edge of thefront surface portion 20A joined to the upper surface of thefront bottom plate 13 through welding means, a left end edge joined to the inner side surface of the left frontvertical plate 14, and a right end edge joined to the inner side surface of the right frontvertical plate 17. - On the other hand, an
opening 20F is formed in thefront plate 20 from thefront surface portion 20A to the firstinclined portion 20C, and theopening 20F is an opening through which a hydraulic hose (not shown) for the workingmechanism 5, for example, passes. Moreover, left and rightcylinder mounting plates front plate 20 from thefront surface portion 20A to the firstinclined portion 20C. - Indicated at 21 is the left cylinder mounting plate provided on the left side front surface of the
front plate 20, and the leftcylinder mounting plate 21 extends in the front and rear directions and is erected from thefront bottom plate 13 to the firstinclined portion 20C of thefront plate 20. The leftcylinder mounting plate 21 is opposed to the left cylinder mountingplate portion 16 provided on theleft bracket portion 14A of the left frontvertical plate 14. - Here, the left
cylinder mounting plate 21 is joined to the left side upper surface of thefront bottom plate 13 and the left side front surface of thefront plate 20 by using the welding means. The left cylinder pin throughhole 21A through which the left cylinder connecting pin is inserted is provided in the front end portion of the leftcylinder mounting plate 21. This left cylinder pin throughhole 21A is arranged oppositely to the left cylinder pin throughhole 16A provided in the left cylinder mountingplate portion 16. - Indicated at 22 is the right cylinder mounting plate provided on the right side front surface of the
front plate 20, and the rightcylinder mounting plate 22 extends in the front and rear directions and is erected from thefront bottom plate 13 to the firstinclined portion 20C of thefront plate 20 similarly to the above-described leftcylinder mounting plate 21. The rightcylinder mounting plate 22 is opposed to the right cylinder mountingplate portion 19 and joined to the right side upper surface of thefront bottom plate 13 and to the right side front surface of thefront plate 20 by using the welding means. The right cylinder pin throughhole 22A through which the rightcylinder connecting pin 28 is inserted is provided in the front end portion of the rightcylinder mounting plate 22, and this right cylinder pin throughhole 22A is arranged oppositely to the right cylinder pin throughhole 19A. - Indicated at 23 and 24 are outside reinforcing plates provided on the outer side surfaces of the front portions of the left and right front
vertical plates plates right bracket portions holes holes vertical plates - Indicated at 25 and 26 are inside reinforcing plates provided on the inner side surfaces of the upper, portions of the left and right front
vertical plates plates plate portions 15 and 18) where boom pin throughholes vertical plates - Indicated at 27 is the boom connecting pin which rotatably supports the foot portion of the
lower boom 5A on the left and right boom mountingplate portions boom connecting pin 27 is inserted through the left and right boom pin throughholes - Indicated at 28 is the right cylinder connecting pin on the bottom side for rotatably supporting the base end portion (bottom portion) of the
right boom cylinder 5E between the right cylinder mountingplate portion 19 and the rightcylinder mounting plate 22, and the rightcylinder connecting pin 28 is inserted through the right cylinder pin throughholes right boom cylinder 5E on thelower boom 5A. - Subsequently, designated at 30 is a tail frame connected to the rear part side of the
center frame 12. Thistail frame 30 is largely constituted by left and right I-section beams 31 and 32, arear bottom plate 33, and a pair oflateral plates 34, which will be described later. - Indicated at 31 and 32 are left and right I-section beams connected to the left and right front
vertical plates center frame 12 and thefront bottom plate 13, and each of the I-section beams 31 and 32 is formed having an I-shaped section as a whole. Each of these I-section beams 31 and 32 is arranged on the rear side of the left and right frontvertical plates - Here, the left I-
section beam 31 is formed of a left rearvertical plate 31A extending in the front and rear directions, theupper flange portion 31B joined to the upper end edge of the left rearvertical plate 31A by using the welding means and extending in the front and rear directions, and alower flange portion 31C joined to the lower end edge of the left rearvertical plate 31A by using the welding means and extending in the front and rear directions. Similarly, the right I-section beam 32 is also formed of a right rearvertical plate 32A, theupper flange portion 32B, and alower flange portion 32C similarly to the left I-section beam 31. - The front end side of the
tail frame 30 is configured to be connected to the rear end portion of thecenter frame 12 by the welding means. Thus, the front end edge of each of the rearvertical plates vertical plates upper flange portions vertical plates lower flange portions rear bottom plate 33, which will be described later, to the rear end edge of thefront bottom plate 13, respectively. Here, in case thetail frame 30 and thecenter frame 12 are connected, the height dimension B of the front ends of theupper flange portions holes - Indicated at 33 is the rear bottom plate which connects the lower end sides of the left and right I-section beams 31 and 32, and the
rear bottom plate 33 is formed having a flat-plate shape by a steel plate or the like and joined to thelower flange portions openings rear bottom plate 33 and configured so that maintenance and the like of mounted equipment such as an engine or the like from the lower side of the upper revolvingstructure 4 through each of theopenings - Indicated at 34 are a pair of lateral plates which connect the I-section beams 31 and 32 at two spots in the intermediate portions of the left and right I-section beams 31 and 32, and each of the
lateral plates 34 is formed having a flat-plate shape by a steel plate and the like and joined to the upper surface of therear bottom plate 33 and each of thevertical plates upper flange portions lower flange portions engine support brackets 34A, totaling in four (SeeFIGS. 2 to 4 ), are provided on each of thelateral plates 34, and each of theengine support brackets 34A supports the engine through an antivibration mount (not shown). - Designated at 35 is a left side frame mounted at left side positions of the
center frame 12 and thetail frame 30. Theleft side frame 35 is composed of a left D-section frame 36 having a D-shaped section and extending in the front and rear directions, a plurality of left extension beams 37 provided between the left D-section frame 36 and thecenter frame 12 as well as thetail frame 30 and extending in the left and right directions, acab support frame 38 which supports thecab 6 and the like. - Designated at 39 is the right side frame mounted on the right side positions of the
center frame 12 and thetail frame 30, and theright side frame 39 is composed of a right D-section frame 40 having a D-shaped section and extending in the front and rear directions, a plurality of right extension beams 41 provided between the right D-section frame 40 and thecenter frame 12 as well as thetail frame 30 and extending in the left and right directions and the like. - Subsequently, the configuration of the
center frame 12 used in this embodiment will be described in comparison with the configuration in a comparative example illustrated inFIGS. 10 and 11 . In the comparative example, dashes (′) are given to the configurations corresponding to those in this embodiment, and the description will be omitted. - A
center frame 12′ of the comparative example illustrated inFIGS. 10 and 11 has each of boom pin throughholes 15A′ and 18A′ of left and right boom mountingplate portions 15′ and 18′ provided at positions higher than the front ends ofupper flange portions 31B′ and 32B′ of I-section beams 31′ and 32′ constituting atail frame 30′. That is, in the comparative example, supposing that a height dimension from afront bottom plate 13′ to the hole centers of the boom pin throughholes 15A′ and 18A′ is Ap and a height dimension from thefront bottom plate 13′ to the front ends of theupper flange portions 31B′ and 32B′ is Bp, the height dimension Ap is set larger than the height dimension Bp as shown in the following formula 2: -
Height dimension Ap>height dimension Bp [Formula 2] - On the other hand, in this embodiment, as illustrated in
FIGS. 3 and 8 , supposing that the height dimension from thefront bottom plate 13 to the hole centers of the boom pin throughholes front bottom plate 13 to the front ends of theupper flange portions formula 1. - Moreover, in this embodiment, suppose that a distance dimension between the hole centers of the left and right cylinder pin through
holes holes FIGS. 10 and 11 as shown in the following formula 3: -
Distance D in horizontal direction>distance Dp in horizontal direction [Formula 3] - That is, as illustrated in
FIG. 10 , suppose that a distance dimension between the hole centers of the left and right cylinder pin throughholes 16A′ and 19A′ and the hole centers of the boom pin throughholes 15A′ and 18A′ in the comparative example is Cp and a distance in the horizontal direction is Dp. In this case, the horizontal direction distance D in this embodiment illustrated inFIG. 8 is set larger than the horizontal direction distance Dp in the comparative example (See Formula 3). - Specifically, even if the height dimension A in this embodiment is set smaller than the height dimension Ap in the comparative example, the distance dimension C in this embodiment is set substantially equal to the distance dimension Cp in the comparative example. That is, in this embodiment, the horizontal direction distance D is set larger than the horizontal direction distance Dp by the comparative example in accordance with a portion by which the height dimension A is set smaller than the height dimension Ap (See Formula 3).
- As a result, in this embodiment, even if the height dimension A from the
front bottom plate 13 to the hole centers of the boom pin throughholes lower boom 5A and the base end portion of eachboom cylinder 5E can be set larger, whereby the force of eachboom cylinder 5E can be effectively used. - Moreover, as illustrated in
FIG. 9 , in this embodiment, suppose that a distance (interval in the horizontal direction) between the center line S-S in the front and rear directions passing through the middle of the left frontvertical plate 14 and the right frontvertical plate 17 of thecenter frame 12 and the revolving center O of thecenter frame 12 is E. In this case, in this embodiment, this distance E is set smaller compare to the distance Ep of the configuration of the comparative example illustrated inFIGS. 10 and 11 as shown in the following formula 4: -
Distance E<distance Ep [Formula 4] - That is, as illustrated in
FIG. 11 , suppose that a distance (interval in the horizontal direction) between the center line Sp-Sp in the front and rear directions passing through the middle of the left frontvertical plate 14′ and the right frontvertical plate 17′ of thecenter frame 12′ and the revolving center Op of thecenter frame 12′ is Ep in the comparative example. In this case, the distance E in this embodiment illustrated inFIG. 9 is set smaller compare to the distance Ep in the comparative example (See Formula 4). - As a result, in this embodiment, balance (position relationship) between the left front
vertical plate 14 and the right frontvertical plate 17 with respect to theswing circle 3 can be made close to equal in the left and right directions, and torsion of thecenter frame 12 can be reduced. - According to this embodiment, the
hydraulic excavator 1 has the configuration as above, and thishydraulic excavator 1 travels to a work site by running on a public road or the like by using thelower traveling structure 2 and then, moving the workingmechanism 5 upward/downward while revolving the upper revolvingstructure 4 so as to perform earth and sand excavation. - Here, during the excavation or the like by the working
mechanism 5, a large load such as an excavation reaction force or the like is applied to the left and right frontvertical plates center frame 12 which supports this workingmechanism 5. On the other hand, regarding thecenter frame 12 according to this embodiment, the height dimension A from thefront bottom plate 13 to the hole centers of the boom pin throughholes front bottom plate 13 to the front ends of theupper flange portions front bottom plate 13 to the foot portion of thelower boom 5A can be reduced, and a twisting moment, a bending moment and the like applied to the left and right frontvertical plates lower boom 5A can be suppressed by that portion. - Thus, it is no longer necessary to provide a reinforcing member between the left and right front vertical plates and the front bottom plate or to constitute a box-like form front part sides of the left and right vertical plates (center beam), as in the conventional art and the size and weight of the
center frame 12 can be reduced. Moreover, the height dimension of the entirehydraulic excavator 1 can be reduced by the portion by which the height position of the foot portion of thelower boom 5A can be reduced. Therefore, when a trailer on which thehydraulic excavator 1 is loaded runs on a public road, for example, this height dimension can be easily arranged within a range regulated by laws and regulations. - According to this embodiment, the horizontal direction distance D between the hole centers of the left and right cylinder pin through
holes holes front bottom plate 13 to the hole centers of the boom pin throughholes holes holes front bottom plate 13 to the hole centers of the boom pin throughholes lower boom 5A and the base end portion of each of theboom cylinders 5E can be ensured large, and the force of each of theboom cylinders 5E can be effectively used. - According to this embodiment, the distance E between the center line S-S in the front and rear directions passing through the middle of the left front
vertical plate 14 and the right frontvertical plate 17 and the revolving center O of thecenter frame 12 is set small. Therefore, in this embodiment, balance (position relationship) between each of the left frontvertical plate 14 and the right frontvertical plate 17 with respect to theswing circle 3 can be made close to equal in the left and right directions. As a result, theswing circle 3 can receive the force applied from each of the frontvertical plates front bottom plate 13 in a state closer to equal in the left and right directions, and torsion of thecenter frame 12 can be reduced. That is, thecenter frame 12 can be configured advantageously in terms of strength. - In other words, if the horizontal direction distance D between the hole centers of the cylinder pin through
holes holes boom cylinders 5E becomes large. However, in this embodiment, a shift amount (offset amount) of each of theboom cylinders 5E with respect to the revolving center O is reduced by setting the distance E smaller so as to ensure strength of theentire center frame 12. - Moreover, according to this embodiment, the
front plate 20 connecting the front part sides between the left and right frontvertical plates front plate 20 can be improved more compare to thefront plate 20′ formed by being bent at one spot as in the comparative example illustrated inFIGS. 10 and 11. - In this embodiment, it is explained by citing the
hydraulic excavator 1 provided with the workingmechanism 5 having two-piece boom specification, in which the boom is divided into two parts, that is, thelower boom 5A and theupper boom 5B, as an example. - However, the present invention is not limited to the same, and can be applied to a hydraulic excavator provided with a mono-boom working device configured by a single boom, for example.
- Moreover, in this embodiment, the wheel-type
hydraulic excavator 1 having thewheels 2B was described as an example of a construction machine, but the present invention is not limited to the same, and can be applied to other construction machines such as a crawler-type hydraulic excavator and the like, for example. - 1: Hydraulic excavator (Construction machine)
- 2: Lower traveling structure
- 4: Upper revolving structure
- 5: Working mechanism
- 5A: Lower boom (Boom)
- 5E: Boom cylinder
- 11: Revolving frame
- 12, 12′: Center frame
- 13, 13′: Front bottom plate
- 14, 14′: Left front vertical plate
- 14A: Left bracket portion
- 15A, 15A′: Left boom pin through hole
- 16A, 21A, 16A′: Left cylinder pin through hole
- 17, 17′: Left front vertical plate
- 17A: Right bracket portion
- 18A, 18A′: Right boom pin through hole
- 19A, 22A, 19A′: Right cylinder pin through hole
- 20, 20′: Front plate
- 20B: First bending portion
- 20D: Second bending portion
- 30, 30′: Tail frame
- 31, 32, 31′, 32′:Left and right I-section beam
- 31A, 32A: Left and right rear vertical plate
- 31B, 32B, 31B′, 32W: Upper flange portion
- 31C, 32C: Lower flange portion
- 33: Rear bottom plate
- A, Ap: Height dimension
- B, Bp: Height dimension
- C, Cp: Distance dimension
- D, Dp: Horizontal direction distance
- E, Ep: Distance
- O, Op: Revolving center
- S-S, Sp-Sp: Center line
Claims (5)
1. A construction machine comprising:
a lower traveling structure;
an upper revolving structure rotatably mounted on said lower traveling structure; and
a working mechanism liftably provided on a front part side of said upper revolving structure;
wherein a center frame of a revolving frame constituting said upper revolving structure is composed of a front bottom plate and left and right front vertical plates extending in the front and rear directions on said front bottom plate, erecting in the left and right directions with an interval, and having the front part side being a bracket portion for performing pin-connection of a boom of said working mechanism and a boom cylinder;
a tail frame connected to a rear part side of said center frame is composed of left and right I-section beams joined to a rear part of each of said front vertical plates and a rear bottom plate connecting each of said I-section beams to each other; and
said left and right I-section beams are formed of left and right rear vertical plates extending in the front and rear directions and having front ends joined to each of said front vertical plates, an upper flange portion provided on the upper side of each of said rear vertical plates, extending in the front and rear directions, and having a front end joined to each of said front vertical plates, and a lower flange portion provided on the lower side of each of said rear vertical plates, extending in the front and rear directions and having the front end joined to said front bottom plate; characterized in that:
a boom pin through hole performing pin-connection of a foot portion of said boom is provided on said bracket portion of said center frame; and
supposing that a height dimension from said front bottom plate to a hole center of said boom pin through hole is (A) and a height dimension from said front bottom plate to the front end of said upper flange portion, portion is (B), said height dimension (A) is set smaller than said height dimension (B).
2. The construction machine according to claim 1 , wherein a cylinder pin through hole performing pin-connection of said boom cylinder is provided in said bracket portion of said center frame on the front side of said boom pin through hole and at a position on the lower side; and
supposing that a distance dimension between the hole center of said cylinder pin through hole and the hole center of said boom pin through hole is (C) and a distance in the horizontal direction is (D) when said height dimension (A) is set smaller than said height dimension (B), and
supposing that, as a comparison target, a distance dimension between the hole center of a cylinder pin through hole and the hole center of a boom pin through hole is (Cp) and a distance in the horizontal direction is (Dp) when a height dimension (Ap) from a front bottom plate to the hole center of said boom pin through hole is set larger than a height dimension (Bp) from said front bottom plate to the front end of an upper flange portion,
said distance (D) is set larger than said distance (Dp) in accordance with a portion by which said height dimension (A) is set smaller than said height dimension (Ap) so that said distance dimension (C) becomes substantially equal to said distance dimension (Cp).
3. The construction machine according to claim 1 , wherein supposing that a distance between a center line (S-S) in the front and rear directions passing through the middle of said left front vertical plate and said right front vertical plate of said center frame and a revolving center (O) of said center frame is (E) when said height dimension (A) is set smaller than said height dimension (B), and
supposing that, as a comparison target, a distance between a center line (Sp-Sp) in the front and rear directions passing through the middle of a left front vertical plate and a right front vertical plate of a center frame and a revolving center (Op) of said center frame is (Ep) when said height dimension (Ap) from said front bottom plate to the hole center of said boom pin through hole is set larger than said height dimension (Bp) from said front bottom plate to the front end of said upper flange portion,
said distance (E) is set smaller than said distance (Ep).
4. The construction machine according to claim 1 , wherein a cylinder pin through hole performing pin-connection of said boom cylinder is provided in said bracket portion of said center frame on the front side of said boom pin through hole and at a position on the lower side; and
supposing that a distance dimension between the hole center of said cylinder pin through hole and the hole center of said boom pin through hole is (C) and a distance in the horizontal direction is (D) when said height dimension (A) is set smaller than said height dimension (B), and that a distance between a center line (S-S) in the front and rear directions passing through the middle of said left front vertical plate and said right front vertical plate of said center frame and the revolving center (O) of said center frame is (E),
supposing that, as a comparison target, a distance dimension between a hole center of a cylinder pin through hole and a hole center of a boom pin through hole is (Cp) and a distance in the horizontal direction is (Dp) when a height dimension (Ap) from a front bottom plate to the hole center of said boom pin through hole is set larger than a height dimension (Bp) from said front bottom plate to a front end of an upper flange portion, and that a distance between a center line (Sp-Sp) in the front and rear directions passing through the middle of a left front vertical plate and a right front vertical plate of a center frame and a revolving center (Op) of said center frame is (Ep),
said distance (D) is set larger than said distance (Dp) and also, said distance (E) is set smaller than said distance (Ep) in accordance with a portion by which said height dimension (A) is set smaller than said height dimension (Ap) so that said distance dimension (C) becomes substantially equal to said distance dimension (Cp).
5. The construction machine according to claim 1 , wherein a front plate extending in the left and right directions and connecting said left and right front vertical plates is provided on the front part sides between said left and right front vertical plates; and
a first bent portion and a second bent portion bent at two spots in the front and rear directions are provided in said front plate.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-189426 | 2010-08-26 | ||
JP2010189426 | 2010-08-26 | ||
PCT/JP2011/065962 WO2012026233A1 (en) | 2010-08-26 | 2011-07-13 | Construction machine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130149094A1 true US20130149094A1 (en) | 2013-06-13 |
Family
ID=45723244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/696,466 Abandoned US20130149094A1 (en) | 2010-08-26 | 2011-07-13 | Construction machine |
Country Status (7)
Country | Link |
---|---|
US (1) | US20130149094A1 (en) |
EP (1) | EP2610406A1 (en) |
JP (1) | JPWO2012026233A1 (en) |
KR (1) | KR20130124168A (en) |
CN (1) | CN103003497A (en) |
RU (1) | RU2013113177A (en) |
WO (1) | WO2012026233A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013087463A (en) * | 2011-10-17 | 2013-05-13 | Kobelco Contstruction Machinery Ltd | Upper frame of construction machine |
US20150060158A1 (en) * | 2013-08-28 | 2015-03-05 | Caterpillar Global Mining America Llc | Multi-purpose machine chassis |
US9217237B2 (en) * | 2014-01-09 | 2015-12-22 | Kobelco Construction Machinery Co., Ltd. | Side frame for construction machine |
US20170107689A1 (en) * | 2015-10-14 | 2017-04-20 | Caterpillar Inc. | Support structure for frame of a machine |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5786885B2 (en) * | 2013-04-09 | 2015-09-30 | コベルコ建機株式会社 | Swing bracket for construction machinery |
JP6297905B2 (en) * | 2014-04-22 | 2018-03-20 | 日立建機株式会社 | Construction machinery |
NO2714752T3 (en) | 2014-05-08 | 2018-04-21 | ||
JP6531505B2 (en) * | 2015-06-11 | 2019-06-19 | 株式会社タダノ | Telescopic boom mounting structure |
CN107635907B (en) * | 2015-06-11 | 2019-06-21 | 株式会社多田野 | The mounting structure of telescopic arm |
JP6694677B2 (en) * | 2015-08-10 | 2020-05-20 | 株式会社神戸製鋼所 | Revolving frame, and working machine equipped with it |
JP2020165126A (en) * | 2019-03-28 | 2020-10-08 | 日立建機株式会社 | Hydraulic shovel |
JP7208878B2 (en) * | 2019-09-12 | 2023-01-19 | 株式会社日立建機ティエラ | construction machinery |
CN114406620B (en) * | 2022-01-27 | 2023-09-08 | 江苏润邦重工股份有限公司 | Production and manufacturing process of main steel structural part of hydraulic material grabbing machine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3664321B2 (en) | 1994-12-15 | 2005-06-22 | 株式会社小松製作所 | Swivel frame of construction vehicle |
JP3236781B2 (en) | 1996-07-26 | 2001-12-10 | 日立建機株式会社 | Construction machine swivel frame |
JP3634723B2 (en) | 2000-05-31 | 2005-03-30 | 日立建機株式会社 | Construction machine swivel frame |
JP4594544B2 (en) * | 2001-03-26 | 2010-12-08 | 株式会社小松製作所 | Swivel frame |
JP4248945B2 (en) * | 2003-06-11 | 2009-04-02 | 株式会社小松製作所 | Swivel frame |
KR100753991B1 (en) * | 2006-09-22 | 2007-08-31 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Upper frame structure of supporting cab of construction machine |
JP2011144553A (en) * | 2010-01-14 | 2011-07-28 | Kobelco Contstruction Machinery Ltd | Working machine |
-
2011
- 2011-07-13 CN CN2011800344352A patent/CN103003497A/en active Pending
- 2011-07-13 JP JP2012530584A patent/JPWO2012026233A1/en active Pending
- 2011-07-13 KR KR1020127033586A patent/KR20130124168A/en not_active Application Discontinuation
- 2011-07-13 US US13/696,466 patent/US20130149094A1/en not_active Abandoned
- 2011-07-13 EP EP11819702.9A patent/EP2610406A1/en not_active Withdrawn
- 2011-07-13 WO PCT/JP2011/065962 patent/WO2012026233A1/en active Application Filing
- 2011-07-13 RU RU2013113177/03A patent/RU2013113177A/en unknown
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013087463A (en) * | 2011-10-17 | 2013-05-13 | Kobelco Contstruction Machinery Ltd | Upper frame of construction machine |
US20150060158A1 (en) * | 2013-08-28 | 2015-03-05 | Caterpillar Global Mining America Llc | Multi-purpose machine chassis |
US9296436B2 (en) * | 2013-08-28 | 2016-03-29 | Caterpillar Global Mining America Llc | Multi-purpose machine chassis |
US9217237B2 (en) * | 2014-01-09 | 2015-12-22 | Kobelco Construction Machinery Co., Ltd. | Side frame for construction machine |
US20170107689A1 (en) * | 2015-10-14 | 2017-04-20 | Caterpillar Inc. | Support structure for frame of a machine |
Also Published As
Publication number | Publication date |
---|---|
CN103003497A (en) | 2013-03-27 |
RU2013113177A (en) | 2014-10-10 |
EP2610406A1 (en) | 2013-07-03 |
JPWO2012026233A1 (en) | 2013-10-28 |
WO2012026233A1 (en) | 2012-03-01 |
KR20130124168A (en) | 2013-11-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20130149094A1 (en) | Construction machine | |
US7887124B2 (en) | Cab structure for construction machine | |
JP4814235B2 (en) | Construction machinery cab structure | |
EP1867558B1 (en) | Frame structure for working vehicle | |
JP5666234B2 (en) | Construction machinery | |
JP5009933B2 (en) | Wheel loader | |
KR101837220B1 (en) | Construction machine swing frame | |
JP3634723B2 (en) | Construction machine swivel frame | |
JP2006328764A (en) | Turning frame of construction machinery | |
JP2007063839A (en) | Protection structure for construction equipment, and cab for construction equipment | |
JP2012162911A (en) | Revolving frame of construction machine | |
JP4179406B2 (en) | Swivel construction machine | |
US8387714B2 (en) | Rear implement mounting frame construction for tractor | |
US12037768B2 (en) | Work vehicle | |
CN102051894A (en) | Upper frame of construction machine | |
JP2001171977A (en) | Wheel type construction machine | |
JP4567242B2 (en) | Construction machine swivel frame | |
CN105644625B (en) | Subframe constructs afterwards | |
JP2003154856A (en) | Swing type construction machine | |
JP3695301B2 (en) | Small swing excavator at the rear end | |
JP6847528B2 (en) | Construction machinery | |
JP2001317084A (en) | Slewing frame for construction machine and assembly method therefor | |
WO2022064920A1 (en) | Wheeled construction machine | |
JP4675925B2 (en) | Tractor frame structure | |
JP4351841B2 (en) | Construction machine swivel frame |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HITACHI CONSTRUCTION MACHINERY CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKANISHI, MASASHI;ABE, SHINYA;TANAKA, YASUSHI;REEL/FRAME:029434/0556 Effective date: 20120919 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |