Elastic coupling for diesel engine

Abstract

The elastic coupling comprises a flange, a middle body, a cover plate and a vibration reduction mechanism, the flange and the cover plate are connected with the two ends of the middle body respectively, a transmission shaft penetrates through the center of the flange and the center of the middle body, and the vibration reduction mechanism comprises a reed arranged on the middle body and a vibration reduction cavity used for installing the reed. The middle body is provided with a weight reduction part which is communicated with the vibration reduction cavity. The spring piece and the vibration reduction cavity are arranged in the middle body, the spring piece is matched with lubricating oil to generate large viscous friction damping, the good damping characteristic is achieved, the amplitude during resonance can be reduced, the coupler has the buffering and vibration absorption effects, and safe operation of an engine is guaranteed. The multiple reeds are arranged in the middle body, the overall weight of the coupler can be further increased, in the scheme, the middle body is subjected to weight reduction design through the weight reduction part, the weight reduction part is communicated with the vibration reduction cavity, lubricating oil circulates, the lubricating effect of the reeds is improved, and abrasion of the reeds is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of couplings, and particularly relates to an elastic coupling for a diesel engine. BACKGROUND

[0002] During the operation of an engine, torsional vibration is generated in the crankshaft system. The combination of the high elasticity of the spring sheet inside the rear-end coupling and the damping generated by the flow of engine oil can transfer the amplitude of dangerous resonance outside the engine operating speed range, ensuring the safe operation of the engine. Therefore, the coupling is an important component for ensuring the safe operation of the engine.

[0003] A conventional plate spring coupling for the rear end of a vehicle engine is internally arranged with an intermediate block and provided with multiple groups of spring sheets. The overall volume of the intermediate block and the spring sheets is large, and the weight is heavy. Due to the weight limitation requirement of the whole vehicle, the overall arrangement at the engine is limited, and therefore, the weight reduction design of the coupling is needed to adapt to the existing lightweight design development.

[0004] In addition, since the spring sheets are arranged in the coupling, vibration and friction will occur during the operation of the engine, causing wear on the spring sheets and the intermediate block, affecting the service life of the spring sheets and the intermediate block. CONTENT OF THE INVENTION

[0005] The application provides an elastic coupling for a diesel engine, which solves the problems of the conventional plate spring coupling, such as large volume, heavy weight, non-compliance with lightweight development requirements, and easy wear of the plate spring.

[0006] The technical scheme adopted by the application is as follows:

[0007] An elastic coupling for a diesel engine, the coupling comprising a flange, an intermediate body, a cover plate, and a damping mechanism, the flange and the cover plate being connected to the two ends of the intermediate body respectively, a transmission shaft passing through the center of the intermediate body from the flange, the damping mechanism comprising spring sheets arranged in the intermediate body and damping cavities for mounting the spring sheets, the intermediate body being provided with a weight reduction portion, the weight reduction portion being communicated with the damping cavities.

[0008] Preferably, the spring sheets are uniformly arranged in multiple numbers along the circumference of the intermediate body, and each of the spring sheets is correspondingly provided with the damping cavities, the damping cavities being provided with an expanded diameter section, the expanded diameter section extending towards the circumferential direction of the intermediate body, and the weight reduction portion comprising the expanded diameter section.

[0009] Preferably, the damping cavities comprise rectangular cavities extending from the outer ring of the intermediate body to the inner ring of the intermediate body, and the two sides of part of the rectangular cavities symmetrically extend outward to form the expanded diameter section, and the extension end of the expanded diameter section is trapezoidal.

[0010] Preferably, the diameter expansion section is located in the middle of the damping cavity, the intermediate body is provided with an oil passage communicating adjacent damping cavities, and the weight reduction portion comprises the oil passage.

[0011] Preferably, the oil passage is obliquely arranged between two adjacent damping cavities.

[0012] Preferably, a plurality of spring pieces are uniformly arranged circumferentially along the intermediate body, each spring piece corresponds to a damping cavity, the intermediate body is provided with an annular cavity communicating adjacent damping cavities, and the annular cavity forms the weight reduction portion.

[0013] Preferably, the intermediate body is provided with a limiting portion communicating the damping cavities, the end portion of the spring piece is connected to the limiting portion, and the spring piece and the limiting portion are in interference fit.

[0014] Preferably, the limiting portion comprises a limiting groove, the spring piece extends from the outer ring to the inner ring along the intermediate body and gradually decreases in width, and the extended end portion is located in the limiting groove.

[0015] Preferably, the limiting portion comprises a slot, the spring piece extends from the outer ring to the inner ring along the intermediate body and gradually decreases in width, and the extended end portion is located in the slot.

[0016] Preferably, a plurality of spring pieces are uniformly arranged circumferentially along the intermediate body, each spring piece corresponds to a damping cavity, the intermediate body is provided with an oil passage communicating adjacent damping cavities, and the oil passage forms the weight reduction portion.

[0017] As the above technical scheme is adopted, the application has the following beneficial effects:

[0018] (1) The damping mechanism is arranged in the application, the spring piece and the damping cavity are arranged in the intermediate body, the spring piece cooperates with the lubricating oil to generate a large viscous friction damping, so that the damping characteristic is good, which is conducive to adjusting the natural frequency of the torque vibration of the shaft system transmission system, reducing the amplitude when resonance occurs, and making the coupling have a buffering and vibration absorbing effect, so as to transfer the amplitude of dangerous resonance to the outside of the engine operating speed range, ensuring the safe operation of the engine. The intermediate body has a large volume, and the spring piece is usually made of steel, which has a large weight. The arrangement of multiple spring pieces in the intermediate body further increases the overall weight of the coupling. In the present application, the intermediate body is designed to reduce weight by the weight reduction portion, which meets the overall lightweight development demand of the engine. The weight reduction portion is arranged to communicate with the damping cavities, which can provide more storage space for the lubricating oil, improve the lubrication effect of the spring piece, and reduce the friction loss of the spring piece.

[0019] (2) The scheme can directly form the weight reduction part through processing the damping cavity, reduce the processing difficulty, avoid the need for additional mold for weight reduction part design, reduce the processing cost, and effectively realize the weight reduction effect of the intermediate body, and facilitate production.

[0020] (3) The scheme sets the oil passage connecting adjacent damping cavities, increases the lubricating oil circulation and storage space, and is conducive to accelerating the circulation of lubricating oil, facilitating the circulation of lubricating oil between the spring pieces, i.e. between the damping cavities, thereby facilitating the lubrication effect of the spring pieces, reducing the wear of the spring pieces and the intermediate body, and prolonging the service life of the spring pieces and the intermediate body. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 It is a structural schematic view of the coupling in an embodiment of the present application.

[0023] Figure 2 It is a sectional view of the intermediate body in an embodiment of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1-intermediate body, 2-spring piece, 3-damping cavity, 31-diameter expansion section, 4-slot, 5-oil passage, 6-flange, 7-cover plate. DETAILED DESCRIPTION

[0026] In order to more clearly explain the overall concept of the present application, the following will be described in detail in an exemplary manner with reference to the drawings.

[0027] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment can be combined with each other without conflict.

[0028] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0031] This application provides a flexible coupling for diesel engines, such as... Figure 1 , Figure 2 As shown, the coupling includes a flange 6, an intermediate body 1, a cover plate 7, and a vibration damping mechanism. The flange 6 and the cover plate 7 are respectively connected to both ends of the intermediate body 1. The drive shaft passes through the center of the flange 6 and the intermediate body 1. The vibration damping mechanism includes a spring 2 disposed in the intermediate body 1 and a vibration damping cavity 3 for mounting the spring 2. The intermediate body 1 is provided with a weight reduction part, which is connected to the vibration damping cavity 3.

[0032] This application proposes a vibration damping mechanism. By incorporating a spring 2 and a damping cavity 3 within the intermediate body 1, the spring, in conjunction with lubricating oil, generates significant viscous frictional damping, resulting in excellent damping characteristics. This facilitates the adjustment of the natural frequency of torque vibration in the shaft transmission system, reduces the amplitude of resonance, and enables the coupling to provide buffering and vibration absorption effects. It shifts the amplitude of dangerous resonance outside the engine's operating speed range, ensuring safe engine operation. The spring 2 is typically made of steel and is quite heavy. Incorporating multiple springs 2 within the intermediate body 1 would further increase the overall weight of the coupling. This design addresses this by using a weight-reducing section to reduce the weight of the intermediate body 1, meeting the overall lightweight development requirements of engines. Furthermore, the connection between the weight-reducing section and the damping cavity 3 provides a larger storage space for lubricating oil, improving the lubrication effect of the spring 2 and reducing its frictional wear.

[0033] In an embodiment, as shown in Figure 2 The plurality of spring plates 2 are evenly arranged along the circumference of the intermediate body 1, and each spring plate 2 is correspondingly provided with a damping cavity 3, the damping cavity 3 is provided with a diameter expansion section 31, the diameter expansion section 31 extends towards the circumferential direction of the intermediate body 1, and the weight reduction part includes the diameter expansion section 31.

[0034] The present scheme involves the diameter expansion section 31 at the damping cavity 3, and the weight reduction part is formed by the diameter expansion section 31, so that the weight reduction part can be directly formed by processing the damping cavity 3, the processing difficulty is reduced, the additional mold for designing the weight reduction part is avoided, the processing cost is reduced, the weight reduction effect of the intermediate body 1 can be effectively achieved, and the production is facilitated.

[0035] Further, the damping cavity 3 includes a rectangular cavity extending from the outer circle of the intermediate body 1 to the inner circle of the intermediate body 1, and the two sides of part of the rectangular cavity symmetrically extend outward to form the diameter expansion section 31, and the extension end of the diameter expansion section 31 is trapezoidal.

[0036] Further, the diameter expansion section 31 is located in the middle of the damping cavity 3, the intermediate body 1 is provided with an oil passage 5 communicating adjacent diameter expansion sections 31, and the weight reduction part includes the oil passage 5.

[0037] The diameter expansion section 31 is located in the middle of the damping cavity 3, which is conducive to ensuring the position stability of the spring plate 2 in the damping cavity 3. If the diameter expansion section 31 is at both ends of the damping cavity 3, the gap distance between the two ends of the damping cavity 3 and the spring plate 2 is too large, which causes the position of the spring plate 2 in the intermediate body 1 to be unstable, which is not conducive to achieving the damping effect, and easily intensifies the collision and wear between the spring plate 2 and the intermediate body 1. The diameter expansion section 31 is located in the middle of the damping cavity 3, which can not only avoid the large amplitude shaking of the spring plate 2 in the damping cavity 3, but also achieve the weight reduction effect of the intermediate body 1 through the improvement of the damping cavity 3, and is conducive to maintaining the overall structure of the intermediate body 1 balanced and stable.

[0038] The present scheme is provided with the oil passage 5 communicating adjacent damping cavities 3, which increases the lubricating oil flow and storage space, and is conducive to accelerating the flow of lubricating oil, facilitating the flow of lubricating oil between the spring plates 2, i.e. between the damping cavities 3, thereby facilitating the lubrication effect of the spring plate 2, reducing the wear of the spring plate 2 and the intermediate body 1, and prolonging the service life of the spring plate 2 and the intermediate body 1.

[0039] The oil passage 5 communicates two adjacent diameter expansion sections 31,

[0040] As a preferred embodiment, as shown in Figure 2 The oil passage 5 is obliquely arranged between two adjacent damping cavities 3. The obliquely arranged oil passage 5 is conducive to further improving the flow speed of the lubricating oil, accelerating the lubrication of the spring plate 2, and improving the lubrication effect and damping effect.

[0041] In another embodiment, the plurality of spring blades 2 are evenly arranged circumferentially along the intermediate body 1, and each spring blade 2 is correspondingly provided with a damping cavity 3. The intermediate body 1 is provided with a ring cavity (not shown in the figure) which communicates adjacent damping cavities 3, and the ring cavity forms a weight-reducing portion.

[0042] It can be understood that the ring cavity is an entirety, and the cavity is arranged circumferentially along the intermediate body 1 to form the ring cavity. The ring cavity of the intermediate body 1 communicates adjacent damping cavities 3. Preferably, the ring cavity is arranged to communicate the middle portions of adjacent damping cavities 3, so as to maintain the overall balance of the intermediate body 1.

[0043] In addition, the ring cavity can realize the circulation of lubricating oil between adjacent damping cavities 3 while communicating the damping cavities 3, so as to further enhance the lubrication effect at the spring blade 2.

[0044] In addition, the volume of a single ring cavity can be reduced, and more than one ring cavity is arranged at intervals on the intermediate body 1, so as to improve the damping effect of the intermediate body 1, facilitate the circulation of lubricating oil, and avoid excessive weight reduction of a single portion, which is beneficial to the overall balance and stability of the intermediate body 1.

[0045] In an embodiment, the intermediate body 1 is provided with a limiting portion which communicates the damping cavities 3, and the end portion of the spring blade 2 is connected with the limiting portion, and the spring blade 2 is in interference fit with the limiting portion.

[0046] The limiting portion is used to limit and fix the spring blade 2, so as to avoid the spring blade 2 from shaking or tilting in the damping cavity 3, thereby ensuring the limiting stability of the damping spring and the use stability of the coupling.

[0047] As an implementation of this embodiment, the limiting portion includes a limiting groove, and the spring blade 2 extends along the intermediate body 1 from the outer ring to the inner ring and gradually decreases in width, and the extending end portion is located in the limiting groove.

[0048] As another implementation of this embodiment, the limiting portion includes a slot 4, and the spring blade 2 extends along the intermediate body 1 from the outer ring to the inner ring and gradually decreases in width, and the extending end portion is located in the slot 4.

[0049] The limiting groove and the slot 4 are common limiting forms, and both of them can communicate the damping cavities 3, which is convenient for installing and limiting the spring blade 2. At the same time, the limiting portion is in interference fit with the spring blade 2, and there is a gap between the spring blade 2 and the limiting portion. In operation, the lubricating oil can pass through the gap to lubricate the end portion of the spring blade 2, thereby reducing the wear between the spring blade 2 and the intermediate body 1, and ensuring the service life of the spring blade 2 and the intermediate body 1.

[0050] In an embodiment, the plurality of spring blades 2 are evenly arranged circumferentially along the intermediate body 1, and each spring blade 2 is correspondingly provided with a damping cavity 3. The intermediate body 1 is provided with an oil passage 5 which communicates two adjacent damping cavities 3, and the oil passage 5 forms a weight-reducing portion.

[0051] By setting the oil passage 5, the oil passage 5 is directly formed as a weight reduction part, which can not only achieve the weight reduction effect of the intermediate body 1, but also improve the flow effect and lubrication effect of the lubricating oil, so that the spring piece 2 generates viscous friction damping with the lubricating oil, reduces the amplitude at resonance, and makes the coupling play a buffering and vibration absorbing effect, thereby protecting the engine and improving the safety and stability of the engine operation. At the same time, the formation of the oil passage 5 directly reduces the weight of the intermediate body 1, reduces the overall weight increase of the spring piece 2 and the vibration absorbing cavity 3 for the coupling, so that the spring piece 2 can realize the buffering and vibration absorbing effect of the coupling while reducing the overall weight increase of the coupling, so as to meet the assembly weight reduction requirement.

[0052] In addition, the oil passage 5 can be provided in multiple along the radial direction of the intermediate body 1, further enhancing the weight reduction effect of the intermediate body 1 and the flow effect of the lubricating oil.

[0053] In addition, it can be understood that the form of the vibration absorbing cavity 3 can be that the inner wall of the intermediate body 1 is provided with relatively protruding portions along the radial direction, and the spring piece 2 is located between the two relatively protruding portions and is clamped therebetween. The formation of the vibration absorbing cavity 3 in this way is easily understood in the art.

[0054] The places not described in the present application can be realized by using or referring to the existing technology.

[0055] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0056] The above only describes the embodiments of the present application and does not limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A flexible coupling for a diesel engine, the coupling comprising a flange (6), an intermediate body (1), a cover plate (7), and a vibration damping mechanism, wherein the flange (6) and the cover plate (7) are respectively connected to both ends of the intermediate body (1), and a drive shaft passes through the center of the flange (6) and the intermediate body (1), characterized in that, The vibration damping mechanism includes a spring (2) disposed in the intermediate body (1) and a vibration damping cavity (3) for mounting the spring (2). The intermediate body (1) is provided with a weight reduction part, which is connected to the vibration damping cavity (3).

2. The flexible coupling according to claim 1, characterized in that, The springs (2) are evenly arranged in a plurality of them along the circumference of the intermediate body (1), and each spring (2) is respectively provided with the damping cavity (3). The damping cavity (3) is provided with an enlarged diameter section (31), which extends toward the circumference of the intermediate body (1). The weight reduction part includes the enlarged diameter section (31).

3. The flexible coupling according to claim 2, characterized in that, The vibration damping cavity (3) includes a rectangular cavity extending from the outer ring of the intermediate body (1) to the inner ring of the intermediate body (1), and the two sides of a portion of the rectangular cavity extend outward symmetrically to form the expansion section (31), the extended end of the expansion section (31) being trapezoidal.

4. The flexible coupling according to claim 2, characterized in that, The enlarged diameter section (31) is located in the middle of the vibration damping cavity (3), and the intermediate body (1) is provided with an oil passage (5) connecting the adjacent enlarged diameter section (31). The weight reduction part includes the oil passage (5).

5. The flexible coupling according to claim 4, characterized in that, The oil passage (5) is inclined between two adjacent damping cavities (3).

6. The flexible coupling according to claim 1, characterized in that, The springs (2) are evenly arranged in a plurality of them along the circumference of the intermediate body (1), and each spring (2) is respectively provided with a damping cavity (3). The intermediate body (1) is provided with an annular cavity that connects adjacent damping cavities (3), and the annular cavity forms the weight reduction part.

7. The flexible coupling according to claim 1, characterized in that, The intermediate body (1) is provided with a limiting part that communicates with the damping cavity (3), the end of the spring (2) is connected to the limiting part, and the spring (2) and the limiting part are interference fit.

8. The flexible coupling according to claim 7, characterized in that, The limiting part includes a limiting groove, and the spring (2) extends from the outer ring to the inner ring along the intermediate body (1) with the width gradually decreasing, and its extended end is located in the limiting groove.

9. The flexible coupling according to claim 7, characterized in that, The limiting part includes a slot (4), and the spring (2) extends from the outer ring to the inner ring along the intermediate body (1) with its width gradually decreasing, and its extended end is located in the slot (4).

10. The flexible coupling according to claim 1, characterized in that, The springs (2) are evenly arranged in a plurality of them along the circumference of the intermediate body (1), and each spring (2) is respectively provided with the damping cavity (3). The intermediate body (1) is provided with an oil passage (5) connecting two adjacent damping cavities (3), and the oil passage (5) forms the weight reduction part.

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