Damping and vibration reduction system for construction machine, and construction machine
Patent Information
- Application Number
- PCT/CN2025/084451
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-10-01
Smart Images
Figure CN2025084451_01102026_PF_FP_ABST
Abstract
Description
Damping and vibration reduction systems for construction machinery and construction machinery Technical Field
[0001] This disclosure relates to the technical field of vibration reduction and isolation in the field of engineering machinery, and particularly to a damping vibration reduction system for engineering machinery and engineering machinery. Background Technology
[0002] With the development of construction machinery technology, the vibration reduction performance and comfort performance of construction machinery products are important indicators of product competitiveness and brand influence. As the main source of vibration in construction machinery, the working implements generate complex vibrations during operation due to the impact from the hydraulic cylinders and the interaction with the construction medium.
[0003] Vibration isolation in construction machinery typically employs conventional vibration dampers. The function of conventional vibration dampers is to block and reduce the transmission of vibration energy from the vibration source to the chassis and from the chassis to the cab, accelerating vibration attenuation to improve vibration fatigue of components and enhance operator comfort. However, the inventors discovered that when working implements are directly connected to the chassis via an integral frame, or interconnected via rubber mounts or pads, the vibrations generated by the working implements are transmitted through the lower frame to the chassis and then to the cab.
[0004] However, current construction machinery operating equipment either lacks vibration isolation systems or uses vibration dampers with poor isolation effects, failing to effectively isolate low-frequency vibrations generated by instantaneous impacts during operation. Ideally, the required vibration damper performance would be high stiffness and high damping, but this is difficult to achieve with traditional vibration dampers. Low-frequency vibrations that cause significant sensitivity in humans still exist.
[0005] The inventors believe that current vibration reduction methods are limited and mainly target translational vibrations. This not only fails to effectively isolate rotational vibrations but also cannot effectively isolate low-frequency vibrations generated by instantaneous impacts during operation, resulting in poor vibration comfort and making it easy for parts to twist or break, thus affecting the safety of construction machinery. Summary of the Invention
[0006] To overcome the above-mentioned technical deficiencies, this disclosure provides a damping and vibration reduction system for engineering machinery, comprising:
[0007] The upper frame is configured to connect to the working tools of construction machinery;
[0008] The lower frame, configured for connection to the operator's cab of the construction machinery, is located below the upper frame; and
[0009] A damping and vibration reduction mechanism, arranged between the upper frame and the lower frame, includes an eddy current damper configured to absorb vibrations between the upper frame and the lower frame.
[0010] In some embodiments, the damping of the eddy current damper is adjustable.
[0011] In some embodiments, the damping and vibration reduction mechanism further includes an elastic element supported by the lower frame and supporting the upper frame.
[0012] In some embodiments, the damping vibration reduction system includes:
[0013] Multiple upper support members are spaced apart between the top of the upper frame and the elastic member to separate the upper frame and the elastic member; and
[0014] Multiple lower support members are arranged at intervals between the bottom of the lower frame and the elastic member to separate the lower support and the elastic member;
[0015] The upper support and the lower support are configured as damping shock absorbers.
[0016] In some embodiments, the eddy current damper includes at least one damping unit, each of the damping units comprising:
[0017] An internal magnetic element is arranged on the outer periphery of the elastic element;
[0018] An outer magnetic element, spaced apart from the elastic element, to form a magnetic field between the inner magnetic element and the outer magnetic element; and
[0019] A conductor is arranged between the inner magnetic component and the outer magnetic component to form eddy currents therein under the action of a magnetic field.
[0020] In some embodiments, the damping system includes a plurality of damping units arranged at intervals along the outer periphery of the elastic member.
[0021] In some embodiments, the plurality of damping units include at least one pair of damping units, each pair of damping units including two damping units arranged substantially symmetrically with respect to the center of the elastic element.
[0022] In some embodiments, the at least one pair of damping vibration reduction units includes at least one of the following:
[0023] A pair of damping and vibration reduction units are respectively arranged at both ends of the longitudinal direction of the elastic element; and
[0024] Another pair of damping and vibration reduction units are respectively arranged at both ends of the elastic member in the lateral direction.
[0025] In some embodiments, some of the plurality of damping units are arranged above and / or below the elastic member to absorb vibrations in the same direction as the elastic member, while the remaining plurality of damping units are arranged in the lateral circumferential portion of the elastic member to absorb vibrations in a different direction than those absorbed by the elastic member; or
[0026] The plurality of damping and vibration reduction units are all arranged at intervals in the lateral circumferential portion of the elastic element to absorb vibrations in a direction different from the vibrations absorbed by the elastic element.
[0027] In some embodiments, the internal magnetic element is embedded within the circumferential portion of the elastic element.
[0028] In some embodiments, the inner magnetic element and the outer magnetic element are made of permanent magnet material or strong magnetic material.
[0029] In some embodiments, the external magnetic element and the conductor element are arranged abutting against each other.
[0030] In some embodiments, the spacing between the internal magnetic element and the conductor element is adjustable.
[0031] In some embodiments, the spacing between the internal magnetic element and the conductor element is varied within the same damping unit.
[0032] In some embodiments, the spacing is configured as one of the following:
[0033] The spacing gradually increases.
[0034] The spacing gradually decreases.
[0035] The spacing at least locally increases first and then decreases; and
[0036] The spacing at least locally decreases first and then increases.
[0037] On the other hand, this disclosure provides an engineering machinery including the above-mentioned damping and vibration reduction system, the engineering machinery comprising:
[0038] The cab is connected to the upper frame, and another damping and vibration reduction mechanism is also provided between the cab and the upper frame to absorb the vibration therebetween;
[0039] The working tool is connected to the lower frame, and another damping and vibration reduction mechanism is also provided between the working tool and the lower frame to absorb the vibration therebetween.
[0040] The embodiments of this disclosure effectively absorb low-frequency vibrations generated during the operation of construction machinery by installing an eddy current damper between the upper and lower frames. Furthermore, the combination of the eddy current damper and the elastic element reduces low-frequency vibrations, while the elastic element reduces high-frequency vibrations, thus achieving vibration reduction across the entire frequency range and improving driver comfort. Attached Figure Description
[0041] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.
[0042] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:
[0043] Figure 1 is a schematic diagram illustrating the structure of an engineering machine according to an embodiment of the present disclosure;
[0044] Figure 2 is a structural schematic diagram illustrating the damping and vibration reduction system of engineering machinery according to an embodiment of the present disclosure; and
[0045] Figure 3 is a cross-sectional view showing the damping vibration reduction system in Figure 2.
[0046] Reference numerals: 10, upper frame; 20, lower frame; 30, damping and vibration reduction mechanism; 31, eddy current damper; 310, damping and vibration reduction unit; 311, internal magnetic component; 312, external magnetic component; 313, conductor component; 32, elastic component; 40, upper support component; 50, lower support component; 60, cab; 70, working implement; 80, hydraulic power component; 90, chassis; 91, upper connecting component; 92, lower connecting component; 93, cab vibration reduction component. Detailed Implementation
[0047] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values set forth in these embodiments should be interpreted as exemplary only and not as limiting.
[0048] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. "Longitudinal" refers to the direction of travel of the engineering machinery, and "lateral" refers to the width direction of the engineering machinery.
[0049] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.
[0050] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.
[0051] Figure 1 illustrates an engineering machine 1 according to an embodiment of the present disclosure, for example, an excavator. The excavator includes a cab 60, a working implement 70, a hydraulic cylinder 80, and a frame 90. The cab 60 is mounted above the frame 90, which is connected to an upper frame 10. A lower frame 20 is connected to the hydraulic cylinder 80 and the working implement 70 and is located below the upper frame 10. To isolate and absorb vibrations between the working implement and the hydraulic cylinder and the cab, a damping vibration reduction system is provided between the working implement and the hydraulic cylinder and the cab. The damping vibration reduction system includes the upper frame 10, the lower frame 20, and a damping vibration reduction mechanism 30 arranged between the upper frame 10 and the lower frame 20. The damping vibration reduction mechanism 30 includes an eddy current damper 31 for absorbing low-frequency vibrations between the upper frame 10 and the lower frame 20. Optionally, the damping of the eddy current damper 31 is adjustable to be adjusted as needed.
[0052] In some embodiments of this disclosure, a first vibration damper 90 is provided between the cab 60 and the upper frame 10. The first vibration damper 90 can be a conventional vibration damper or another damping vibration damping mechanism 30. Another damping vibration damping mechanism 30 can be provided between the hydraulic cylinder 80 and the working implement 70 and the lower frame 20. In this way, the vibration of the cab is significantly reduced through a multi-stage vibration damping system, and the driver's riding comfort is improved.
[0053] In some embodiments of this disclosure, as shown in Figures 2 and 3, the damping vibration reduction mechanism 30 includes an elastic element 32 located between the upper frame 10 and the lower frame 20, for absorbing high-frequency vibrations between the upper frame 10 and the lower frame 20. The elastic element 32 serves to support the upper frame 10 and is also supported by the lower frame 20. The cross-section of the elastic element 32 can be elliptical, and its shape can be an ellipsoid, or other shapes such as a sphere. The surfaces of the upper frame 10 and the lower frame 20 opposite to the elastic element 32 can be configured to match the outer peripheral shape of the elastic element 32.
[0054] In some embodiments of this disclosure, as shown in FIG3, a plurality of spaced-apart upper support members 40 are arranged between the upper frame 10 and the elastic member 32 to separate the upper frame 10 and the elastic member 32; a plurality of spaced-apart lower support members 50 are arranged between the lower frame 20 and the elastic member 32 to separate the lower support 20 and the elastic member 32. This avoids direct contact and friction between the upper frame 10 and the elastic member 32, and avoids direct contact and friction between the lower frame 20 and the elastic member 32, which is beneficial to maintaining the integrity and durability of the elastic member 32. The upper support member 40 and the lower support member 50 are damping shock absorbers. The vibration impact transmitted from the upper frame 10 to the lower frame 20 through the elastic member 32 is distributed through multiple upper support members 40 and multiple lower support members 50. On the other hand, the upper support members 40 and lower support members 50, which are themselves damping shock absorbers, can also absorb vibration impact and buffer vibration impact to avoid excessive local pressure. Optionally, the damping of the damping shock absorber is adjustable and the damping magnitude can be adjusted according to different working conditions.
[0055] In some embodiments of this disclosure, the eddy current damper 31 includes at least one damping unit 310, each of the damping units 310 including: an inner magnetic element 311 disposed on the outer periphery of the elastic element 32; an outer magnetic element 312 disposed at a distance from and opposite to the inner magnetic element 311 to form a magnetic field between the inner magnetic element 311 and the outer magnetic element 312; and a conductor 313 disposed between the inner magnetic element 311 and the outer magnetic element 312 for use under the action of the magnetic field. Eddy currents are formed inside; when the working tool 2 generates vibration and impact, the vibration and impact will be transmitted to the elastic element 32, causing the elastic element 32 to move, resulting in a change in the magnetic field between the inner magnetic element 311 and the outer magnetic element 312, which in turn causes eddy currents to form in the conductor 313. The eddy currents generate an electromagnetic field with the opposite polarity to the magnetic field of the inner magnetic element 311. The two magnetic fields with opposite polarities impede each other's movement, producing an eddy current damping effect. The movement of the elastic element 32 is hindered, and the kinetic energy of the elastic element 32 is converted into heat energy generated by the eddy currents.
[0056] In some embodiments of this disclosure, as shown in FIG3, a plurality of damping units 310 are arranged at intervals along the lateral outer periphery of the elastic member 32. These damping units 310 may optionally be evenly spaced along the lateral outer periphery to absorb vibration impacts from directions other than the vertical direction. The lateral outer periphery refers to the outer periphery of the elastic member 32 other than the upper outer periphery that supports the upper frame 10 and the lower outer periphery that supports the lower frame 20. Optionally, a plurality of damping units 310 may be provided on both the upper and lower outer peripheries of the elastic member 32 as auxiliary damping units, absorbing vertical vibration impacts together with the elastic member 32, thus enhancing the absorption of low-frequency vibrations in the vertical direction.
[0057] In some embodiments of this disclosure, the damping of the damping unit 310 is adjustable. The smaller the distance between the internal magnetic element 311 and the conductor element 313, the larger the damping coefficient of the damping unit 310. Two damping units 310 with different damping coefficients can be obtained by setting different distances in the two damping units 310. Optionally, in the same damping unit 310, by setting the distance to be non-constant, different damping can be set at different positions. That is, in the same damping unit 310, the distance varies along a certain direction, which includes the vertical direction, the lateral circumferential direction, and other circumferential directions; the distance can gradually increase, the distance can gradually decrease, the distance can at least locally increase and then decrease, or the distance can at least locally decrease and then increase. In this way, the damping of the damping unit 310 can be flexibly adjusted as needed, and combinations of multiple damping units 310 with different damping can be formed. Optionally, the plurality of damping vibration reduction units 310 includes at least one pair of damping vibration reduction units 310. Each pair of damping vibration reduction units 310 includes two damping vibration reduction units 310 arranged substantially symmetrically with respect to the center of the elastic member 32. For example, the two damping vibration reduction units 310 are located at the longitudinal ends or the transverse ends, respectively. The two damping vibration reduction units 310 arranged symmetrically with respect to the center of the elastic member 32 generate opposite forces and moments, which can resist not only translational vibrations in the direction of the line connecting the two damping vibration reduction units 310, but also rotational vibrations in the direction of the line connecting the two damping vibration reduction units 310.
[0058] In some embodiments of this disclosure, the internal magnetic element 311 is embedded within the circumferential portion of the elastic element 32. During the manufacture of the elastic element 32, the internal magnetic element 311 is integrally formed by embedding it within the elastic element 32.
[0059] In some embodiments of this disclosure, the inner magnetic element 311 and the outer magnetic element 312 may be made of permanent magnet material or strong magnetic material. The strong magnetic material may be disconnectably connected to a power source, and its magnetic strength is increased when the strong magnetic material is energized.
[0060] In some embodiments of this disclosure, the external magnetic element 312 and the conductor element 313 are arranged abutting against each other, which helps to increase the magnetic flux through the conductor element 313, further increasing the eddy currents generated in the conductor element 313, and thus increasing the damping force on the internal magnetic element 311.
[0061] Although specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.
Claims
1. A damping and vibration reduction system for engineering machinery, comprising: The upper frame (10) is configured to be connected to the working tools (70) of the engineering machinery; The lower frame (20) is configured to connect to the cab (60) of the construction machinery and is located below the upper frame (10); as well as A damping and vibration reduction mechanism (30) is arranged between the upper frame (10) and the lower frame (20), including an eddy current damper (31) configured to absorb vibrations between the upper frame (10) and the lower frame (20).
2. The damping vibration reduction system according to claim 1, wherein the damping of the eddy current damper (31) is adjustable.
3. The damping vibration reduction system according to claim 1 or 2, wherein the damping vibration reduction mechanism (30) further includes an elastic element (32), the elastic element (32) being supported by the lower frame (20) and supporting the upper frame (10).
4. The damping vibration reduction system according to claim 3, comprising: Multiple upper support members (40) are arranged at intervals between the top of the upper frame (10) and the elastic member (32) to separate the upper frame (10) and the elastic member (32); as well as Multiple lower support members (50) are arranged at intervals between the bottom of the lower frame (20) and the elastic member (32) to separate the lower support (20) and the elastic member (32); The upper support (40) and the lower support (50) are configured as damping shock absorbers.
5. The damping vibration reduction system according to claim 3 or 4, wherein the eddy current damper (31) comprises at least one damping vibration reduction unit (310), each of the damping vibration reduction units (310) comprising: An internal magnetic element (311) is arranged on the outer periphery of the elastic element (32); An outer magnetic element (312) is spaced apart from the elastic element (32) to form a magnetic field between the inner magnetic element (311) and the outer magnetic element (312); as well as A conductor (313) is arranged between the inner magnetic element (311) and the outer magnetic element (312) to form eddy currents therein under the action of a magnetic field.
6. The damping vibration reduction system according to claim 5, comprising a plurality of damping vibration reduction units (310) arranged at intervals along the outer periphery of the elastic member (32).
7. The damping vibration reduction system according to claim 6, wherein the plurality of damping vibration reduction units (310) comprises at least one pair of damping vibration reduction units (310), and each pair of damping vibration reduction units (310) comprises two damping vibration reduction units (310) arranged substantially symmetrically with respect to the center of the elastic element.
8. The damping vibration reduction system according to claim 7, wherein the at least one pair of damping vibration reduction units (310) comprises at least one of the following: A pair of damping and vibration reduction units (310) are respectively arranged at both ends of the longitudinal direction of the elastic member (32); and Another pair of damping and vibration reduction units (310) are respectively arranged at both ends of the elastic member (32).
9. The damping vibration reduction system according to claim 6, wherein... Some of the plurality of damping units (310) are arranged above and / or below the elastic member (32) to absorb vibrations in the same direction as the elastic member (32), while the remaining plurality of damping units (310) are arranged in the lateral circumferential portion of the elastic member (32) to absorb vibrations in a different direction than those absorbed by the elastic member (32); or The plurality of damping and vibration reduction units (310) are all arranged at intervals in the lateral circumferential portion of the elastic member (32) to absorb vibrations in a direction different from the vibrations absorbed by the elastic member (32).
10. The damping vibration reduction system according to any one of claims 5-9, wherein the internal magnetic element (311) is embedded in the circumferential portion of the elastic element (32).
11. The damping vibration reduction system according to any one of claims 5-9, wherein the inner magnetic element (311) and the outer magnetic element (312) are made of permanent magnet material or strong magnetic material.
12. The damping vibration reduction system according to any one of claims 5-9, wherein the external magnetic element (312) and the conductor element (313) are arranged abutting against each other.
13. The damping vibration reduction system according to any one of claims 5-9, wherein the spacing between the internal magnetic element (312) and the conductor element (313) is adjustable.
14. The damping vibration reduction system according to any one of claims 5-9, wherein the spacing between the internal magnetic element (312) and the conductor element (313) is varied in the same damping vibration reduction unit (310).
15. The damping vibration reduction system of claim 14, wherein the spacing is configured as one of the following: The spacing gradually increases. The spacing gradually decreases. The spacing at least locally increases first and then decreases; and The spacing at least locally decreases first and then increases.
16. An engineering machinery comprising a damping vibration reduction system according to any one of claims 1-15, wherein the engineering machinery comprises: The cab (60) is connected to the upper frame (10), and another damping and vibration reduction mechanism (30) is also provided between the cab (60) and the upper frame (10) to absorb the vibration therebetween; The working tool (70) is connected to the lower frame (20), and another damping and vibration reduction mechanism (30) is also provided between the working tool (70) and the lower frame (20) to absorb the vibration therebetween.