A crankshaft dynamic balance adaptive dynamic balance device

Abstract

The present invention discloses a crankshaft dynamic balance adaptive dynamic balance device, including a crankshaft and a balance weight. A counterweight is riveted on the balance weight. A groove is provided on the outer side of the balance weight away from the crankshaft. A number of vertical stops are provided on one side of the counterweight close to the balance weight. Inner holes are provided on the side wall of the balance weight corresponding to the vertical stops. An elastic connecting member is further provided between the counterweight and the balance weight. The elastic connecting member includes a tension spring arranged in the inner hole or a leaf spring on the counterweight. When the compressor is running, the dynamic balance device can adaptively adjust the position of the counterweight on the balance weight according to different speeds, thereby changing the center of gravity of the crankshaft, canceling the inertial force generated by the mechanism, and enabling the entire crankshaft to reach balance. This adaptive dynamic balance device can reduce phenomena such as vibration, noise, and fatigue damage generated during the operation of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor crankshafts, and particularly to a crankshaft dynamic balance adaptive dynamic balance device. Background Art

[0002] The refrigerator compressor drives the crankshaft to rotate through an electric motor. The crankshaft makes the piston reciprocate through a connecting rod, thereby realizing the transformation of low-temperature and low-pressure refrigerant vapor into high-temperature and high-pressure refrigerant. In this way, the continuous pushing of the working medium forms a refrigeration cycle. In all machines with mass, where the center of mass of the component has acceleration or the component has angular acceleration, there exist inertial forces. The compressor is theoretically a crank-slider mechanism. During its operation, in addition to being affected by external loads such as the gas force in the compressor cylinder, it is also affected by the inertial forces generated by its various components themselves during the motion state. The inertial forces received by the crank-slider mechanism change periodically with the periodic operation of the mechanism. Due to the high-speed rotation of the crankshaft, the inertial forces of the crank-slider mechanism itself are extremely large. If these adverse inertial forces are not well balanced, these strong inertial forces will cause phenomena such as vibration, noise, and fatigue damage in the compressor. Therefore, the dynamic balance design correction of the compressor mechanism is particularly important.

[0003] The main purpose of the dynamic balance of the mechanism is to eliminate or reduce the action of the inertial forces of the mechanism. The inertial forces of the mechanism itself are generated by its mass and motion, and they cannot be eliminated by itself. Therefore, it is necessary to attach other elements that can generate inertial forces to the mechanism to offset the inertial forces of the original mechanism, so as to make the entire mechanism reach a new balance. Currently, the main methods of dynamic balance of the mechanism include: the counterweight method, the generalized mass substitution method, the balance mechanism balance method, the linear independent vector method, etc. In actual production, the counterweight method and the generalized mass substitution method are widely used due to their strong operability. Even though it is theoretically possible to completely balance the inertial forces, due to various practical conditions restricting the mechanism, it is very difficult to achieve the complete balance of the inertial forces of the mechanism.

[0004] The traditional dynamic balance correction of the compressor is achieved by theoretical calculation. A counterweight block (powder metallurgy part or stamping part) that is approximately close to balance is riveted on the crankshaft balance block to eliminate the inertial forces. For example, the Chinese utility model patent (publication number: CN206206123U) disclosed a crankshaft for a refrigeration compressor in 2017. One or two counterweight blocks were connected to the balance block of the crankshaft by rivets to increase the working stability of the crankshaft; however, the counterweight block is relatively fixed to the balance block, and the center of gravity basically remains unchanged, and it cannot be adaptively matched and adjusted according to the size of the crankshaft speed, and the elimination of inertial forces is not good.

[0005] There is also a way to change the crankshaft counterweight by adding an adaptive counterweight component to the crankshaft. For example, the Chinese Utility Model Patent (Publication No.: CN207728512U) disclosed an adaptive counterweight component for the crankshaft of a refrigerator variable-frequency compressor in 2018, which includes a crankshaft, a cylindrical housing, a counterweight block, and a spring. The crankshaft includes a main shaft and an eccentric shaft connected to the main shaft. One side of the cylindrical housing is assembled and connected to the eccentric shaft, and the cylindrical housing is arranged coaxially with the main shaft. The other side of the cylindrical housing is internally slidably connected with a counterweight block, and the counterweight block is connected to the cylindrical housing through a spring. This adaptive counterweight component can adaptively balance the inertial force, but the structure is complex. It is equivalent to adding a housing to the original crankshaft, which is bound to affect the layout of other components in the compressor and increase the volume of the compressor. Moreover, during the high-speed rotation of the crankshaft and the compression deformation of the spring, the spring may fall off. Summary of the Invention

[0006] The purpose of the present invention is to provide a crankshaft dynamic balance adaptive dynamic balance device for the problems existing in the prior art.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is:

[0008] A crankshaft dynamic balance adaptive dynamic balance device includes a crankshaft, on which a balance block is provided, and a counterweight block is riveted on the balance block; a pair of first strip-shaped riveting holes are provided on the counterweight block, and the pair of first strip-shaped riveting holes are symmetrically arranged on both sides of the counterweight block; corresponding to the first strip-shaped riveting holes on the balance block, second riveting holes are provided accordingly; a connecting rivet is provided in the first strip-shaped riveting hole and the second riveting hole, and the rivet movably connects the counterweight block and the balance block;

[0009] A groove is provided on the outer side surface of the balance block away from the crankshaft, and a plurality of vertical blocks are provided on one side of the counterweight block close to the balance block; the vertical blocks are arranged at the groove and / or both ends of the counterweight block; inner holes are provided on the side wall of the balance block corresponding to the vertical blocks;

[0010] An elastic connecting member is further provided between the counterweight block and the balance block in the direction parallel to the first strip-shaped riveting hole; the elastic connecting member includes a tension spring arranged in the inner hole or a leaf spring on the counterweight block.

[0011] The elastic member can also be carbon spring wire, elastic column, elastic buckle, etc.

[0012] This dynamic balancing device achieves an adaptive state by arranging movable counterweights on the balance block and connecting them with tension springs or leaf springs, enabling the counterweights to reciprocate elastically. When the compressor is running, the dynamic balancing device can adaptively adjust the position of the counterweights on the balance block according to different rotational speeds, thereby changing the center of gravity of the crankshaft, canceling out the inertial forces generated by the mechanism, and achieving balance for the entire crankshaft. This adaptive dynamic balancing device can reduce phenomena such as vibration, noise, and fatigue damage during the operation of the compressor.

[0013] Specifically, for example, when the rotational speed of the compressor increases, the centrifugal force and inertial force generated by the crankshaft increase. Under the tensile force of the leaf spring or the tension spring, the counterweight shifts towards the direction of the crankshaft, causing the center of gravity of the balance block to deviate towards the crankshaft, canceling out part of the outward force and achieving balance for the crankshaft. For example, when the rotational speed of the compressor decreases, the centrifugal force and inertial force generated by the crankshaft decrease. Under the spring force of the leaf spring or the tension spring, the counterweight shifts outwards, causing the center of gravity of the balance block to move away from the crankshaft, canceling out part of the inward force and achieving balance for the crankshaft. During the continuous movement of the compressor, the spring forces generated by the tension spring and the leaf spring continuously act on the counterweight, enabling the counterweight to always find the center of gravity balance point and achieving an adaptive dynamic balance state for the crankshaft.

[0014] This dynamic balancing device mainly adaptively adjusts the position of the counterweight through the spring force and elastic force generated by the tension spring or the leaf spring, and the dynamic balancing effect is better than the method of riveting counterweights on the balance block in the prior art.

[0015] The cooperation setting of the groove and the vertical stop provides a radial movement space for the vertical stop, playing a role in guiding and stabilizing the counterweight. The vertical stop can also prevent the tension spring from falling off from the inner hole. The vertical stop and the outer edge of the counterweight are in a "T" shape.

[0016] This dynamic balancing device has a compact and reasonable overall structure. The balance block and the counterweight are also easy to produce and process, and the assembly method is simple and can be mass-produced by batch assembly. It does not change the original crankshaft structure significantly, does not affect the cooperation between the crankshaft and other components inside the compressor, and can be widely promoted and used, with good use value and benefits.

[0017] Using the riveting holes and rivets of this structure enables the counterweight to move radially on the balance block, and the moving range is exactly the radial length of the first strip-shaped riveting hole. The second riveting hole is circular and matches the size of the rivet, so that the rivet will not move together with the counterweight, ensuring the relative movement between the counterweight and the balance block.

[0018] Further, there are three vertical stops respectively arranged at both end parts of the balance block and at the groove, and there is a pair of inner holes respectively arranged at both end parts of the balance block; the vertical stops at both end parts are arranged in one-to-one correspondence with the inner holes; tension springs are arranged in both of the pair of inner holes, one end of each tension spring is located in the inner hole, and the other end is fixedly connected to the vertical stop.

[0019] Further, there is one vertical stop and one inner hole; one vertical stop corresponds to the groove, the groove is arranged in the middle part of the balance block, and one inner hole is located in the groove; one end of the tension spring is located in the inner hole, and the other end is fixedly connected to the vertical stop.

[0020] Both the groove and the inner hole are arranged at the central part of the balance block, bisecting the balance block left and right. With the inner hole arranged in this structure, after installing the tension spring, it can ensure the left-right balance of the counterweight block, and the left and right forces on the counterweight block and the balance block are evenly balanced, which is beneficial to eliminating the inertia force and reducing vibration and noise.

[0021] Further, a leaf spring is connected to the side of the counterweight block away from the groove; a connecting column is arranged on the balance block, and the connecting column is arranged perpendicular to the surface of the balance block; an arc-shaped groove is arranged on the connecting column, and the arc-shaped groove matches with the leaf spring and clamps the leaf spring. The arrangement of the connecting column is used to fix the leaf spring, with a simple structure and good fixing effect. Moreover, it just plays a fixing role from the middle part of the leaf spring, which is beneficial to the leaf spring to balance and release the spring force.

[0022] Further, the leaf spring has a bent part, a vertical part and a hook part formed integrally; the contour of the bent part is adapted to the outer contour of the counterweight block close to the crankshaft side, and the bent part is clamped and fixed on the balance block; both the vertical part and the hook part are a pair, symmetrically clamped and hooked to the counterweight block; both the bent part and the vertical part are in arc transition.

[0023] The leaf spring adopting this structure can pull the counterweight block, forming a uniform and balanced tension or elastic force inside the counterweight block, which is beneficial to the adaptive adjustment of the counterweight block; the axial thickness of the leaf spring does not exceed the axial thickness of the counterweight block, which is beneficial to the installation of other components on the crankshaft without causing interference.

[0024] Further, the pair of hook parts are arranged facing each other. This makes the connection stable and the force evenly balanced.

[0025] Further, the groove axially penetrates the balance block; the depth of the groove in the radial direction is greater than or equal to the length of the first strip-shaped riveting hole.

[0026] Further, the pair of first strip-shaped riveting holes are arranged parallel to the horizontal central axis of the balance block.

[0027] Furthermore, both the balance weight and the counterweight are fan-shaped, and the outer contour dimension of the counterweight is less than or equal to that of the balance weight.

[0028] Furthermore, the balance weight is integrally formed with the crankshaft; the counterweight is made of metal and is formed by stamping, forging, powder metallurgy or casting. Both the tension spring and the leaf spring are made of spring steel.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the compressor is in operation, the dynamic balance device can adaptively adjust the position of the counterweight on the balance weight according to different speeds, thereby changing the center of gravity of the crankshaft, canceling the inertial force generated by the mechanism, and making the entire crankshaft reach balance. This adaptive dynamic balance device can reduce phenomena such as vibration, noise and fatigue damage during the operation of the compressor; 2. The dynamic balance device of the present invention mainly adaptively adjusts the position of the counterweight through the spring force and elastic force generated by the tension spring or the leaf spring, and the dynamic balance effect is better than the method of riveting the counterweight on the balance weight in the prior art; 3. The overall structure of the dynamic balance device of the present invention is compact and reasonable, and the balance weight and the counterweight are also easy to produce and process. Moreover, the assembly method is simple and can be mass-produced, without affecting the cooperation between the crankshaft and other components in the compressor, and can be widely promoted and used, with good use value and benefits; 4. The cooperation setting of the groove and the vertical stop provides a radial movement space for the vertical stop, playing a role in guiding and stabilizing the counterweight; the vertical stop can also prevent the tension spring from falling off from the inner hole. Description of the Drawings

[0030] Figure 1 is a three-dimensional structural schematic diagram of a crankshaft dynamic balance adaptive dynamic balance device of the present invention;

[0031] Figure 2 is a top view structural schematic diagram of a crankshaft dynamic balance adaptive dynamic balance device of the present invention;

[0032] Figure 3 is a partial cross-sectional view taken along the A-A section of a crankshaft dynamic balance adaptive dynamic balance device of the present invention;

[0033] Figure 4 is a cross-sectional structural schematic diagram of another crankshaft dynamic balance adaptive dynamic balance device of the present invention;

[0034] Figure 5 is a top view structural schematic diagram of yet another crankshaft dynamic balance adaptive dynamic balance device of the present invention;

[0035] In the figure: 1, crankshaft; 2, balance weight; 3, counterweight; 4, first strip-shaped riveting hole; 5, rivet; 6, groove; 7, vertical stop; 8, second riveting hole; 9, inner hole; 10, tension spring; 11, bending part; 12, vertical part; 13, hook part; 14, connecting column; 15, arc-shaped groove. Specific implementation mode

[0036] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work conditions belong to the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] Embodiment 1:

[0039] As Figures 1 to 3 shown, a crankshaft dynamic balance adaptive dynamic balance device includes a crankshaft 1, a balance weight 2 is provided on the crankshaft 1, and a counterweight 3 is riveted on the balance weight 2; a pair of first strip-shaped riveting holes 4 are provided on the counterweight 3, and the pair of first strip-shaped riveting holes 4 are symmetrically arranged on both sides of the counterweight 3; corresponding to the first strip-shaped riveting holes 4 on the balance weight 2, second riveting holes 8 are correspondingly provided; a connecting rivet 5 is provided in the first strip-shaped riveting hole 4 and the second riveting hole 8, and the rivet 5 movably connects the counterweight 3 and the balance weight 2;

[0040] The outer side of the balance weight 2 away from the crankshaft 1 is provided with a groove 6, and one side of the counterweight 3 facing the balance weight 2 is provided with three vertical stops 7; the vertical stops 7 are arranged at the groove 6 and both ends of the counterweight 3; the side wall of the balance weight 2 is provided with an inner hole 9;

[0041] The inner holes 9 are a pair and are respectively arranged at both ends of the balance weight 2; the vertical stops 7 at both ends correspond to the inner holes 9 one by one; tension springs 10 are provided in both of the pair of inner holes 9, one end of the tension spring 10 is located in the inner hole 9, and the other end is fixedly connected to the vertical stop 7.

[0042] This dynamic balancing device has a movable counterweight 3 arranged on the balance weight 2 and is connected by a pair of tension springs 10, enabling the counterweight 3 to reciprocate elastically to reach an adaptive state. When the compressor is running, this dynamic balancing device can adaptively adjust the position of the counterweight 3 on the balance weight 2 according to different rotational speeds, thereby changing the center of gravity of the crankshaft 1, canceling out the inertial force generated by the mechanism, and achieving balance for the entire crankshaft 1. Such an adaptive dynamic balancing device can reduce phenomena such as vibration, noise, and fatigue damage during the operation of the compressor.

[0043] This dynamic balancing device mainly adaptively adjusts the position of the counterweight 3 through the spring force and elastic force generated by the tension spring 10, and the dynamic balancing effect is better than the method of riveting the counterweight on the balance weight in the prior art.

[0044] The cooperation of the groove 6 in the arc-shaped part with the vertical stop 7 provides a radial movement space for the vertical stop 7 at this position, playing a role in guiding and stabilizing the counterweight 3; the vertical stops 7 at both ends can also prevent the tension spring 10 from falling off from the inner hole 9; the vertical stop 7 and the outer edge of the counterweight 3 are in a "T" shape.

[0045] This dynamic balancing device is compact and reasonable in overall structure, and the balance weight 2 and the counterweight 3 are also easy to produce and process. Moreover, the assembly method is simple and can be mass-produced by batch assembly. It does not change the original crankshaft structure significantly, does not affect the cooperation between the crankshaft and other components in the compressor, and can be widely promoted and used, with good use value and benefits.

[0046] With the riveting holes and rivets of this structure, the counterweight 3 can move radially on the balance weight 2, and the moving range is exactly the radial length of the first strip-shaped riveting hole 4; the second riveting hole 8 is circular and matches the size of the rivet 5, and is assembled onto the balance weight 2 by riveting, so that the rivet 5 will not move together with the counterweight 3, ensuring the relative movement between the counterweight 3 and the balance weight 2.

[0047] Furthermore, the groove 6 runs through the balance weight 2 axially; the depth of the groove 6 in the radial direction is greater than the length of the first strip-shaped riveting hole 4.

[0048] Furthermore, a pair of the first strip-shaped riveting holes 4 are arranged parallel to the horizontal central axis of the balance weight 2 (perpendicular to the central axis of the crankshaft 1).

[0049] Furthermore, both the balance weight 2 and the counterweight 3 are fan-shaped, and the outer contour size of the counterweight 3 is smaller than the outer contour size of the balance weight 2.

[0050] Further, the balance weight 2 is integrally formed with the crankshaft 1; the counterweight 3 is made of metal and is formed by stamping, forging, powder metallurgy or casting.

[0051] Embodiment 2:

[0052] The difference between this embodiment and Embodiment 1 is that the inner hole is provided at the groove, and no inner hole is provided at both ends.

[0053] Specifically, as Figure 4 shown, a crankshaft dynamic balance adaptive dynamic balance device includes a crankshaft 1, a balance weight 2 is provided on the crankshaft 1, and a counterweight 3 is riveted to the balance weight 2 through a rivet 5;

[0054] There is one vertical stop 7 and one inner hole 9; the vertical stop 7 corresponds to the groove 6, the groove 6 is provided in the middle of the balance weight 2, and the inner hole 9 is located in the groove 6; one end of the tension spring 10 is located in the inner hole 9, and the other end is fixedly connected to the vertical stop 7.

[0055] The setting of the tension spring in this structure can also make the counterweight 3 play the role of adaptive dynamic balance.

[0056] The groove 6 and the inner hole 9 are both provided at the central part of the balance weight 2, and the balance weight 2 is bisected left and right. With the inner hole 9 set in this structure, after installing the tension spring, the left and right balance of the counterweight 3 can be ensured, and the left and right forces on the counterweight 3 and the balance weight 2 are balanced, which is beneficial to eliminating the inertial force and reducing vibration and noise.

[0057] At the same time, the setting of the inner hole and the vertical stop is reduced, further simplifying the structure of this dynamic balance device, reducing the part processing cost and assembly difficulty, and further improving the economic benefit and use value.

[0058] Embodiment 3:

[0059] As Figure 5 shown, a crankshaft dynamic balance adaptive dynamic balance device includes a crankshaft 1, a balance weight 2 is provided on the crankshaft 1, and a counterweight 3 is riveted to the balance weight 2; a pair of first strip-shaped riveting holes 4 are provided on the counterweight 3, and the pair of first strip-shaped riveting holes 4 are symmetrically arranged on both sides of the counterweight 3; corresponding to the first strip-shaped riveting holes 4 on the balance weight 2, second riveting holes are provided accordingly; a connecting rivet 5 is provided in the first strip-shaped riveting holes 4 and the second riveting holes, and the rivet 5 movably connects the counterweight 3 and the balance weight 2;

[0060] One side of the counterweight 3 away from the groove 6 is connected with a leaf spring; a connecting column 14 is arranged on the balance weight 2, and the connecting column 14 is arranged perpendicular to the surface of the balance weight 2; an arc-shaped groove 15 is arranged on the connecting column 14, and the arc-shaped groove 15 is matched with the leaf spring and clamps the leaf spring. The arrangement of the connecting column 14 is used to fix the leaf spring, with a simple structure and good fixing effect. Moreover, it just plays a fixing role from the middle of the leaf spring, which is beneficial to the leaf spring to balance and release the spring force.

[0061] Further, the leaf spring has an integrally formed bending part 11, a vertical part 12 and a hook part 13; the contour of the bending part 11 is adapted to the outer contour of the counterweight 3 close to the crankshaft 1, and the bending part 11 is clamped and fixed on the connecting column 14; the vertical part 12 and the hook part 13 are both a pair, symmetrically clamped and hooked on the counterweight 3; both the bending part 11 and the vertical part 12 are in arc transition.

[0062] The leaf spring adopting this structure can pull the counterweight 3 to form a uniform and balanced pulling force or elastic force inside the counterweight 3, which is beneficial to the adaptive adjustment of the counterweight 3; the axial thickness of the leaf spring does not exceed the axial thickness of the counterweight 3, which is beneficial to the installation of other components on the crankshaft 1 and does not cause interference.

[0063] Further, the pair of hook parts 13 are arranged facing each other. This makes the connection stable and the force evenly balanced.

[0064] The inner hole setting is cancelled in this structure, which further simplifies the structure of this dynamic balancing device, reduces the part processing cost and assembly difficulty, and further improves the economic benefit and use value.

[0065] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crankshaft dynamic balance adaptive dynamic balance device, including a crankshaft, a balance weight is provided on the crankshaft, and a counterweight is riveted on the balance weight; It is characterized in that A pair of first strip-shaped riveting holes are provided on the counterweight, and the pair of first strip-shaped riveting holes are symmetrically arranged on both sides of the counterweight; corresponding to the first strip-shaped riveting holes on the balance weight, second riveting holes are provided accordingly; a connecting rivet is provided in the first strip-shaped riveting hole and the second riveting hole, and the connecting rivet movably connects the counterweight and the balance weight; A groove is provided on the outer side surface of the balance weight away from the crankshaft, and several vertical stops are provided on one side of the counterweight close to the balance weight; the vertical stops are three and are respectively arranged at both end parts and the groove of the balance weight; inner holes are respectively provided on the side wall of the balance weight corresponding to the vertical stops or the groove corresponding to the vertical stops; The counterweight and the balance weight are also provided with an elastic connecting piece in the direction parallel to the first strip-shaped riveting hole; the elastic connecting piece includes a tension spring arranged in the inner hole or a leaf spring on the counterweight; a leaf spring is connected to the side of the counterweight away from the groove, a connecting column is provided on the balance weight, and an arc-shaped groove is provided on the connecting column, and the arc-shaped groove matches with the leaf spring and clamps the leaf spring; one end of the tension spring is located in the inner hole, and the other end is fixedly connected to the vertical stop; The pair of first strip-shaped riveting holes are arranged parallel to the horizontal central axis of the balance weight; the groove runs through the balance weight along the axial direction; the depth of the groove along the radial direction is greater than or equal to the length of the first strip-shaped riveting hole.

2. The crankshaft dynamic balance adaptive dynamic balance device according to claim 1, It is characterized in that The connecting column is arranged perpendicular to the surface of the balance weight.

3. The crankshaft dynamic balance adaptive dynamic balance device according to claim 1, It is characterized in that The leaf spring has an integrally formed bending part, a vertical part and a hook part; the contour of the bending part is adapted to the outer contour of the counterweight on the side close to the crankshaft, and the bending part is clamped and fixed on the balance weight; the vertical part and the hook part are both a pair, symmetrically clamped and hooked on the counterweight; both the bending part and the vertical part are in arc transition.

4. The crankshaft dynamic balance adaptive dynamic balance device according to claim 3, It is characterized in that A pair of the hook parts are arranged facing each other.

5. The crankshaft dynamic balance adaptive dynamic balance device according to claim 1, It is characterized in that Both the balance weight and the counterweight are fan-shaped, and the outer contour dimension of the counterweight is less than or equal to the outer contour dimension of the balance weight.

6. The crankshaft dynamic balance adaptive dynamic balance device according to claim 1, It is characterized in that The balance weight is integrally formed with the crankshaft; the counterweight is made of metal material and is formed by stamping, forging, powder metallurgy or casting.

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