Crawler frame for construction machine
View Patent ↗In a crawler frame in which legs in a center frame are formed from cast steel, a simple structure is achieved by reducing the number of components. To this end, the crawler frame, which has a center frame composed of a central frame section for supporting a swing bearing and legs located on the right and left sides of the central frame section; and track frames disposed on the sides of the distal ends of the legs, respectively, of the center frame, is designed such that each of the legs is bifurcated into front and rear leg sections and the front and rear leg sections are respectively formed from cast steel.
1. A crawler frame for a construction machine, said crawler frame comprising:
a center frame including: (i) a central frame section for supporting a swing bearing and (ii) cast steel legs respectively located at right and left sides of the central frame section; and
track frames disposed at distal ends of the respective legs of the center frame;
wherein each of the cast steel legs is bifurcated into front and rear separately cast, cast steel leg sections;
wherein a base section of each said leg has a two-part structure;
wherein a base section of the front leg section of each said leg is securely welded to a base section of the rear leg section of the leg; and
wherein the base section of each said leg is securely welded to the central frame section.
2. The crawler frame for a construction machine according to claim 1 , wherein the central frame section includes an upper face plate, a lower face plate, a front face plate and a rear face plate which are welded to the base section of each said leg, such that an entire circumference of the base section of each said leg is welded to the central frame section.
3. The crawler frame for a construction machine according to claim 1 , wherein the base section of the front leg section of each said leg comprises a vertical plate section at a rear end thereof, and the base section of the rear leg section of each said leg comprises a vertical plate section at a front end thereof; and
wherein the base sections of the front and rear leg sections are substantially rectangular in cross-section.
4. The crawler frame for a construction machine according to claim 1 , wherein the central frame section comprises upper and lower face plates which are joined to each said leg by J groove welds, and surfaces of the upper and lower face plates are flush with corresponding upper and lower faces of each said leg.
5. The crawler frame for a construction machine according to claim 2 , wherein the upper and lower face plates of the central frame section are joined to each said leg by J groove welds, and surfaces of the upper and lower face plates are flush with corresponding upper and lower faces of each said leg.
6. A crawler frame for a construction machine, said crawler frame comprising:
a center frame including: (i) a central frame section for supporting a swing bearing and (ii) cast steel leas respectively located at right and left sides of the central frame section; and
track frames disposed at distal ends of the respective legs of the center frame;
wherein each of the cast steel legs is bifurcated into front and rear separately cast, cast steel leg sections; and
wherein each of the front and rear leg sections of each said leg comprises a vertical wall which is formed from cast steel and which is integral with a base section of the respective one of the front and rear leg sections.
7. The crawler frame for a construction machine according to claim 6 , wherein the legs are coupled to the central frame section such that the vertical walls are located substantially immediately under a circular mount of the central frame section for supporting the swing bearing.
8. The crawler frame for a construction machine according to claim 6 , wherein each said vertical wall comprises a hole, which has a thickened lip, for having a hydraulic oil pipe passed therethrough.
9. The crawler frame for a construction machine according to claim 6 , wherein the central frame section comprises upper and lower face plates which are joined to each said leg by J groove welds, and wherein surfaces of the upper and lower face plates are flush with corresponding upper and lower faces of each said leg.
10. The crawler frame for a construction machine according to claim 6 , wherein the central frame section comprises right and left side supporting plates, and base sections of the legs are inserted into and securely welded to the central frame section so as to face a corresponding one of the side supporting plates.
11. The crawler frame for a construction machine according to claim 10 , wherein the side supporting plates are located substantially immediately under a circular mount of the central frame section for supporting the swing bearing.
12. The crawler frame for a construction machine according to claim 10 , wherein each of the side supporting plates comprises a hole for having a hydraulic oil pipe passed therethrough, and a grommet is fit on a lip defining each said hole.
13. The crawler frame for a construction machine according to claim 7 , wherein the central frame section comprises upper and lower face plates which are joined to each said leg by J groove welds, and surfaces of the upper and lower face plates are flush with corresponding upper and lower faces of each said leg.