Casting rocker arm for loading machine
By adopting the "work" font structure and gradient changing thickness design in the rocker arm of the loader, combined with the thin plate connecting ribs and shaft beam grooves, the problems of excessive weight and high cost of the rocker arm of the existing loader are solved, and structural strength is achieved The balance with lightweight reduces production costs.
Patent Information
- Application Number
- CN202421026123.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-11
AI Technical Summary
The existing loader rocker arms use thicker sheets to ensure structural strength, resulting in increased weight of the rocker arms, which increases the working burden of the bucket cylinder and increases the production cost.
The "work" font structure design of the cast rocker arm is designed, the upper and lower beams are connected by thin plate connecting ribs, and the shaft beam grooves are designed on the outside of the intermediate shaft hole. Through the gradient changing structure and thickness gradient buffering, the force distribution is optimized and weight is reduced. and reduce costs.
It realizes that while ensuring structural strength, the weight of the rocker arm is reduced, the production cost is reduced, and the reliability of the rocker arm is improved by optimizing the force distribution.
Smart Images
Figure CN222477596U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to a casting rocker arm for a loader. Background Art
[0002] The loader rocker arm generally uses a plate welding structure. Since the rocker arm is an important force transmission component in the working device, the reliability and anti-deformation requirements of the structure are high. The main load-bearing component of the normal rocker arm is the vertical plate on the side. When the rocker arm is subjected to the maximum force, it is generally defaulted to the support and rising condition. At this time, when the large cavity of the bucket cylinder is filled with oil to exert the maximum thrust, the concentrated force position is concentrated on the lower end surface of the rocker arm, close to the end of the bucket cylinder, such as Figure 6 The framed area shown is prone to deformation or fatigue fracture of the rocker arm plate. Therefore, when selecting the rocker arm plate, the structural strength at the maximum stress point must be ensured, and thicker plate specifications must be used during design.
[0003] Therefore, in the prior art, in order to ensure the structural reliability of key stress-bearing positions, the rocker arm plate welding structure uses thicker blanking plates. Although this can meet the strength requirements at the maximum stress point, it makes the structural strength of other positions of the rocker arm excessive and extremely difficult to adjust the structure, resulting in a heavier plate rocker arm, which increases the workload of the bucket cylinder and also increases the manufacturing cost. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a casting rocker arm for a loader.
[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:
[0006] A casting rocker arm for a loader comprises an upper crossbeam and a lower crossbeam, wherein a structural axle beam and a thin plate connecting rib are arranged between the upper crossbeam and the lower crossbeam, the upper crossbeam, the structural axle beam and the lower crossbeam form an "I"-shaped structure, an intermediate axle hole is arranged in the middle of the structural axle beam, and an axle beam groove for reducing local weight is arranged on the structural axle beam located outside the intermediate axle hole.
[0007] Preferably, the thin plate connecting ribs are provided at two locations, and the structural axis beam is provided between the two thin plate connecting ribs.
[0008] Preferably, the upper cross beam, the thin plate connecting ribs and the lower cross beam are an integrated structure.
[0009] Preferably, the thickness of the upper cross beam and the lower cross beam is L1, the middle thickness of the thin plate connecting rib is L2, L2 ≥ 18 mm, and the thickness ratio between L2 and L1 is 1 / 10 to 1 / 2.
[0010] Preferably, the depth of the axle beam groove is H, and the thickness ratio between H and L1 is 1 / 7 to 1 / 3.
[0011] Preferably, shaft hole position buffer platforms are provided at both ends of the upper crossbeam and the lower crossbeam.
[0012] Preferably, the thickness of the upper cross beam near the middle shaft hole is greater than the thickness of the upper cross beam near the shaft hole position buffer platform.
[0013] Preferably, the thickness of the lower cross beam near the middle shaft hole is greater than the thickness of the lower cross beam near the shaft hole position buffer platform.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. The main body of the cast rocker arm is designed based on the "I"-shaped structure. The upper and lower crossbeams serve as the upper and lower main structures of the "I"-shaped structure, and are connected by thin plate connecting ribs in the middle to form an "I"-shaped load-bearing structure. According to the force cloud diagram of the rocker arm when it is supported and raised, the positions of the upper and lower crossbeams in different areas are adjusted to a gradient structure with different thicknesses, and the outer side of the middle shaft hole of the rocker arm is designed as a shaft beam groove to reduce weight and optimize force at the same time;
[0016] 2. The upper and lower beams are connected by thin plate connecting ribs. The local position of the thin plate connecting ribs adopts a gradual thickness structure to buffer the force and ensure reliability. This structure can not only maintain high strength reliability, but also realize the weight reduction design of the rocker arm and reduce costs;
[0017] 3. The upper and lower beams are designed with unequal thickness. The thickness of the beam near the buffer platform near the shaft hole is the thinnest, and the thickness of the beam near the middle shaft hole is the thickest. The three points of thin-thick-thin are used as the thickness reference for smooth transition. At the same time, different maximum and minimum thickness parameters are set for the upper and lower beams due to the different forces they bear, so that the thickness parameters of each part of the beam are reasonably distributed to the greatest extent.
[0018] To summarize, the utility model combines the finite element analysis of the supporting rising conditions, and the cast rocker arm body uses an "I"-shaped force structure. The upper and lower cross beams at the middle shaft hole of the rocker arm are thickened to ensure sufficient strength, and the thickness is reduced at other positions. The rocker arm structure is redistributed and redesigned to achieve the purpose of weight reduction, while reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 It is the front view of the utility model;
[0021] Figure 3 for Figure 2 Sectional view of AA in the middle;
[0022] Figure 4 for Figure 2 Cross-sectional view of the middle BB;
[0023] Figure 5 This is the force cloud diagram of the casting rocker arm support when it is in the rising condition;
[0024] Figure 6 It is a structural schematic diagram of a box-type welding rocker arm in the prior art.
[0025] In the figure: 1. upper crossbeam; 2. lower crossbeam; 3. structural axis beam; 301. axis beam groove; 4. thin plate connecting ribs; 5. axis hole position buffer platform; 6. middle axis hole. DETAILED DESCRIPTION
[0026] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.
[0027] Embodiment 1:
[0028] like Figure 1-2 As shown, a cast rocker arm for a loader includes an upper crossbeam 1 and a lower crossbeam 2, a structural axle beam 3 and a thin plate connecting rib 4 are arranged between the upper crossbeam 1 and the lower crossbeam 2, the upper crossbeam 1, the structural axle beam 3 and the lower crossbeam 2 form an "I"-shaped structure, an intermediate axle hole 6 is arranged in the middle of the structural axle beam 3, and an axle beam groove 301 for reducing local weight is arranged on the structural axle beam 3 located outside the intermediate axle hole 6.
[0029] In the “I”-shaped structure, the upper and lower beams are used as the main load-bearing structure. According to the force cloud diagram of the rocker arm support rising working condition, as shown in Figure 5 As shown, the positions of different areas of the upper and lower beams are adjusted to a gradient structure with unequal thickness, and the outer side of the rocker arm intermediate shaft hole 6 is designed as an axle beam groove 301, so as to reduce weight and optimize force; at the same time, the upper and lower beams are connected by thin plate connecting ribs 4, and the local position of the thin plate connecting ribs 4 adopts a thickness gradient structure to buffer the force and ensure reliability. Therefore, this structure can not only maintain high strength and reliability, but also realize the weight reduction design of the rocker arm and reduce costs.
[0030] Embodiment 2:
[0031] A casting rocker arm for a loader is different from Example 1 in that the thin plate connecting ribs 4 are provided at two locations, and the structural axle beam 3 is provided between the two thin plate connecting ribs 4.
[0032] like Figure 3As shown, the upper crossbeam 1, thin plate connecting rib 4 and lower crossbeam 2 are an integrated structure, the thin plate connecting rib 4 is a smooth transition structure that is thin in the middle and thick on both sides, and the thin plate connecting rib 4 has a smooth transition thickness gradient at the contact edges with the upper crossbeam 1 and the lower crossbeam 2.
[0033] The thickness of the upper crossbeam 1 and the lower crossbeam 2 is L1, the middle thickness of the thin plate connecting rib 4 is L2, L2≥18mm, and the thickness ratio between L2 and L1 is 1 / 10~1 / 2; the thin plate connecting rib 4 adopts a thickness gradient transition structure, which can reduce the peak force at the connection position of the upper crossbeam 1, the lower crossbeam 2 and the thin plate connecting rib 4 to an allowable value, so as not to exceed the allowable stress at the concentrated force point due to a sudden change in the cross section.
[0034] like Figure 4 As shown, the depth of the axle beam groove 301 is H, and the thickness ratio between H and L1 is 1 / 7 to 1 / 3. If the axle beam groove 301 is too shallow, the weight reduction purpose cannot be achieved, but the maximum depth cannot exceed a certain value, otherwise the structural strength cannot be guaranteed. Preferably, the thickness ratio between H and L1 is 1 / 4. By designing the axle beam groove 301 at the structural axle beam 3 in a sunken manner, the sunken depth H and the external contour dimensions are the result of the weight reduction design after topological optimization, which not only meets the force requirements here but also reduces the local weight. Figure 5 As shown in the force cloud diagram, the stress of the axle beam groove 301 after adjustment can still be guaranteed to be within the allowable range.
[0035] Furthermore, shaft hole position buffer platforms 5 are provided at both ends of the upper crossbeam 1 and the lower crossbeam 2. The shaft hole position buffer platforms 5 at both ends form a transition connection with the upper crossbeam 1, the lower crossbeam 2 and the thin plate connecting ribs 4. The upper crossbeam 1 and the lower crossbeam 2 are connected by the structural shaft beam 3. The sunken design of the structural shaft beam 3 is a weight-reducing design structure after topological optimization, which not only optimizes the force here but also reduces the local weight, thereby realizing the overall design of the cast rocker arm.
[0036] Furthermore, the thickness of the upper crossbeam 1 near the middle shaft hole 6 is greater than the thickness of the upper crossbeam 1 near the shaft hole position buffer platform 5, and the thickness of the lower crossbeam 2 near the middle shaft hole 6 is greater than the thickness of the lower crossbeam 2 near the shaft hole position buffer platform 5; the upper crossbeam 1 and the lower crossbeam 2 adopt an unequal thickness grading design, the thickness of the beam near the shaft hole position buffer platform 5 is the thinnest, and the thickness of the beam near the middle shaft hole 6 is the thickest, and a smooth transition is performed using the three points of thin-thick-thin as the thickness reference, and at the same time, different maximum and minimum thickness parameters are set for the upper crossbeam 1 and the lower crossbeam 2 due to the different forces they bear, so that the thickness parameters of each part of the beam are reasonably distributed to the greatest extent.
Claims
1. A casting rocker arm for a loader, characterized in that: The invention comprises an upper crossbeam (1) and a lower crossbeam (2), wherein a structural axis beam (3) and a thin plate connecting rib (4) are arranged between the upper crossbeam (1) and the lower crossbeam (2), the upper crossbeam (1), the structural axis beam (3) and the lower crossbeam (2) form an "I"-shaped structure, an intermediate axis hole (6) is arranged in the middle of the structural axis beam (3), and an axis beam groove (301) for reducing local weight is arranged on the structural axis beam (3) located outside the intermediate axis hole (6).
2. The casting rocker arm for a loader according to claim 1, characterized in that: The thin plate connecting ribs (4) are arranged at two locations, and the structural axis beam (3) is arranged between the two thin plate connecting ribs (4).
3. The casting rocker arm for a loader according to claim 1, characterized in that: The upper crossbeam (1), the thin plate connecting ribs (4) and the lower crossbeam (2) are an integrated structure.
4. The casting rocker arm for a loader according to claim 3, characterized in that: The thickness of the upper crossbeam (1) and the lower crossbeam (2) is L1, the middle thickness of the thin plate connecting rib (4) is L2, L2 is ≥ 18 mm, and the thickness ratio between L2 and L1 is 1 / 10 to 1 / 2.
5. The casting rocker arm for a loader according to claim 4, characterized in that: The depth of the axle beam groove (301) is H, and the thickness ratio between H and L1 is 1 / 7 to 1 / 3.
6. The casting rocker arm for a loader according to any one of claims 1 to 5, characterized in that: Axle hole position buffer platforms (5) are provided at both ends of the upper crossbeam (1) and the lower crossbeam (2).
7. The casting rocker arm for a loader according to claim 6, characterized in that: The thickness of the upper cross beam (1) near the middle shaft hole (6) is greater than the thickness of the upper cross beam (1) near the shaft hole position buffer platform (5).
8. The casting rocker arm for a loader according to claim 6, characterized in that: The thickness of the lower cross beam (2) near the middle shaft hole (6) is greater than the thickness of the lower cross beam (2) near the shaft hole position buffer platform (5).