Balance block, crankshaft and engine

Abstract

The utility model relates to the technical field of engines, in particular to a balance block, a crankshaft and an engine, the balance block comprises a main body part and a wind breaking part, the main body part is of a fan-shaped annular structure, and in the radial direction of the main body part, the thickness of the main body part is gradually reduced from one end close to the circle center of the fan-shaped annular structure to one end far away from the circle center; the wind breaking part is arranged at at least one end of the main body part and extends in the radial direction of the main body part, the wind breaking part is provided with a large end and a small end, in the circumferential direction of the main body part, the large end is connected with the end of the main body part, and the small end is located at the end, away from the main body part, of the wind breaking part. The thickness of the main body part is gradually reduced from the end close to the circle center in the radial direction to the end away from the circle center, so that the windward area is reduced, the wind breaking part is arranged at the end of the main body part and provided with the large end and the small end, and the small end is located at the end, away from the main body part, of the wind breaking part, so that the wind resistance coefficient is reduced, and finally the air resistance is reduced. Therefore, energy loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a balance weight, a crankshaft and an engine. Background Art

[0002] The crankshaft is an important rotating component in an engine. When it rotates at high speed, it needs to achieve dynamic balance to eliminate or reduce the vibration and noise generated during high-speed rotation of the crankshaft. In order to minimize the rotating inertia force and its moment and the reciprocating inertia force and its moment that generate vibration and noise, balance weights are provided on the crankshaft. The windward surface of the traditional balance weight is rectangular, and the wind resistance is relatively large during the rotation process.

[0003] In this regard, a prior art provides a crankshaft with reduced resistance. By adding inclined surfaces or rounded corners on the upper, lower and side surfaces of the balance weight, the gas flow is facilitated, and the resistance of the balance weight of the crankshaft is reduced. The wind resistance is positively correlated with the windward area and the wind resistance coefficient. This balance weight only makes local modifications on the basis of the traditional structure, thereby reducing the wind resistance coefficient, but its windward area has not been reduced, so there is still a problem of relatively large wind resistance. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a balance weight, a crankshaft and an engine to solve the problem that the existing crankshaft balance weight has a relatively large windward area, resulting in relatively large wind resistance.

[0005] The utility model provides a balance weight, including a main body part and a wind-breaking part. The main body part is a fan-shaped ring structure. Along the radial direction of the main body part, the thickness of the end of the main body part close to the center of the fan-shaped ring structure gradually decreases towards the end away from the center. The wind-breaking part is arranged at at least one end of the main body part. The wind-breaking part is integrally provided with the main body part. The wind-breaking part extends along the radial direction of the main body part. The wind-breaking part is provided with a large end and a small end. Along the circumferential direction of the main body part, the large end is connected to the end of the main body part, and the small end is located at the end of the wind-breaking part away from the main body part.

[0006] As a preferred technical solution of the balance weight, two wind-breaking parts are provided, and the two wind-breaking parts are respectively arranged at both ends of the main body part.

[0007] As a preferred technical solution of the balance weight, both sides of the main body part are provided with frustum-shaped walls. The two frustum-shaped walls are symmetrically arranged. A rounded corner part is arranged between the two frustum-shaped walls. The rounded corner part extends along the circumferential direction of the main body part. Both ends of the rounded corner part are respectively connected to the two frustum-shaped walls.

[0008] As a preferred technical solution of the balance weight, both sides of the wind-breaking part are provided with wind-breaking walls. The two wind-breaking walls are symmetrically arranged. Along the circumferential direction of the main body part, the ends of the two wind-breaking walls away from the main body part are connected to form a wind-breaking edge.

[0009] As a preferred technical solution of the balance weight, a transition part is further arranged between the main body part and the wind-breaking part, and two ends of the transition part are respectively connected with the main body part and the wind-breaking part.

[0010] As a preferred technical solution of the balance weight, the transition part is provided with a transition wall, two ends of the transition wall are respectively connected with the frustum-shaped wall and the wind-breaking wall, along the direction from the small end to the large end of the wind-breaking part, the curvature of the transition wall increases, and the curvature at the connection position of the transition wall and the frustum-shaped wall is equal to the curvature of the frustum-shaped wall.

[0011] As a preferred technical solution of the balance weight, both sides of the main body part are set as frustum-shaped walls, the two frustum-shaped walls are symmetrically arranged, along the radial direction of the main body part, one ends of the two frustum-shaped walls located at the outer edge of the main body part are connected to form an outer edge cutting edge.

[0012] The utility model provides a crankshaft, which includes a crank, and also includes the balance weight of any one of the above solutions, and the balance weight is fixedly connected with the crank.

[0013] As a preferred technical solution of the crankshaft, a plurality of balance weights are provided, and the plurality of balance weights are spaced apart along the axis direction of the main journal of the crankshaft.

[0014] The utility model provides an engine, which includes the crankshaft of any one of the above solutions.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model provides a balance weight, the main body part is set such that the thickness gradually decreases from the end close to the center of the sector ring structure along the radial direction to the end far from the center, so as to reduce the windward area, and a wind-breaking part is arranged at the end of the main body part, and the wind-breaking part is provided with a large end and a small end, and the small end is located at the end of the wind-breaking part far from the main body part, so as to reduce the wind resistance coefficient, finally reduce the air resistance, and thus reduce the energy loss.

[0017] The utility model provides a crankshaft, which includes a crank and the balance weight of the utility model. By arranging the balance weight in the utility model, the air resistance of the balance weight is smaller during the rotation of the crankshaft, thereby reducing the energy loss.

[0018] The utility model provides an engine, which includes the crankshaft of the utility model. By arranging the crankshaft of the utility model, the energy loss during the operation of the engine is reduced, thereby improving the fuel economy of the engine. Description of the Drawings

[0019] Figure 1 It is the front view of the assembly of the balance weight and the crankshaft in the embodiment of the utility model;

[0020] Figure 2 It is the side view of the assembly of the balance weight and the crankshaft in the embodiment of the utility model;

[0021] Figure 3 This is a schematic structural diagram of the balance weight in the embodiment of the present utility model.

[0022] In the figure:

[0023] 1. Crank; 2. Balance weight; 21. Main body part; 211. Frustum-shaped wall; 22. Rounded corner part; 23. Air-breaking part; 231. Air-breaking wall; 24. Transition part. Specific embodiments

[0024] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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 utility model 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 construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0028] As Figures 1 - 3 shown, the present utility model provides a balance weight 2, which includes a main body portion 21 and a wind-breaking portion 23. The main body portion 21 and the wind-breaking portion 23 are integrally provided. The main body portion 21 is arranged in a sector-shaped ring structure and is used to connect to one of the cranks 1 of the crankshaft. Along the radial direction of the main body portion 21, the thickness of one end of the main body portion 2 closer to the center of the sector-shaped ring structure gradually decreases towards the other end away from the center. Compared with the traditional balance weight with a rectangular cross-sectional shape, the thickness of one end of the main body portion 2 closer to the center of the sector-shaped ring structure gradually decreases towards the other end away from the center, that is, the cross-sectional shape of the main body portion 2 along its radial direction is set as a triangle, and its windward area is smaller, thereby reducing air resistance. The wind-breaking portion 23 is arranged at one end of the main body portion 21, specifically at one end of the main body portion 21 along its rotation direction. The wind-breaking portion 23 extends along the radial direction of the main body portion 21, that is, the wind-breaking portion 23 extends from the inner edge of the main body portion 21 to the outer edge of the main body portion 21. Along the circumferential direction of the main body portion 21, the wind-breaking portion 23 is provided with a large end and a small end. The large end is connected to the end of the main body portion 21, and the small end is located at the end of the wind-breaking portion 23 away from the main body portion 21, thereby reducing the wind resistance coefficient of the balance weight 2 and further reducing air resistance to reduce energy loss.

[0029] Furthermore, as Figure 2 shown, two wind-breaking portions 23 are provided. The two wind-breaking portions 23 are respectively arranged at both ends of the main body portion 21, so that the wind resistance coefficients at both ends of the main body portion 21 are reduced. When the balance weight 2 is installed on the crank 1 of the crankshaft, there is no need to distinguish the installation direction of the balance weight 2 according to the rotation direction of the crankshaft.

[0030] Furthermore, as Figures 1 - 3 shown, both sides of the main body portion 21 are provided with frustum-shaped walls 211, and the two frustum-shaped walls 211 are symmetrically arranged to ensure uniform mass distribution on both sides of the main body portion 21 and avoid generating an axial offset load along the balance weight 2 during high-speed rotation. Please refer to Figures 2 - 3As shown, a fillet portion 22 is provided between two frustum-shaped walls 211. The fillet portion 22 extends along the circumferential direction of the main body portion 21. The two ends of the fillet portion 22 are respectively connected to the two frustum-shaped walls 211, preferably being tangent to each other to ensure smoothness at the connection position. Thus, the cross-sectional shape of the main body portion 21 along its radial direction is approximately triangular, which reduces its windward area and can effectively avoid the edges of the main body portion 21 from cutting the operator during the installation process. In other embodiments, the fillet portion 22 can also be cancelled, and the two frustum-shaped walls 211 are directly connected, that is, along the radial direction of the main body portion 21, the ends of the two frustum-shaped walls 211 located at the outer edge of the main body portion 21 are connected to form an outer edge blade. Correspondingly, the cross-sectional shape of the main body portion 21 along its radial direction is triangular, which also realizes reducing the windward area. And to avoid the outer edge blade from cutting the operator, its rounding treatment can be carried out.

[0031] Furthermore, as Figures 2 - 3 shown, both sides of the wind-breaking portion 23 are provided with wind-breaking walls 231. The two wind-breaking walls 231 are symmetrically arranged to ensure uniform mass distribution on both sides of the wind-breaking portion 23 and avoid generating an axial offset load along the balance block 2 during high-speed rotation. Along the circumferential direction of the main body portion 21, the two ends of the two wind-breaking walls 231 far from the main body portion 21 are connected to form a wind-breaking blade, that is, the small end of the wind-breaking portion 23 is provided with a wind-breaking blade, thereby further reducing the wind resistance coefficient. Similarly, to avoid the wind-breaking blade from cutting the operator, its rounding treatment can also be carried out.

[0032] Even further, please continue to refer to Figures 2 - 3 shown, a transition portion 24 is further provided between the main body portion 21 and the wind-breaking portion 23. The two ends of the transition portion 24 are respectively connected to the main body portion 21 and the wind-breaking portion 23. Transition portions 24 are provided on both sides of the wind-breaking portion 23 for connection with the main body portion 21. By providing the transition portion 24, the wind resistance coefficient is further reduced. The transition portion 24 is provided with a transition wall. The two ends of the transition wall are respectively connected to the frustum-shaped wall 211 and the wind-breaking wall 231. Along the direction from the small end to the large end of the wind-breaking portion 23, the curvature of the transition wall increases, and the curvature at the connection position between the transition wall and the frustum-shaped wall 211 is equal to the curvature of the frustum-shaped wall 211 to achieve smooth connection between the transition wall and the frustum-shaped wall 211.

[0033] The present utility model provides a crankshaft, which includes a plurality of cranks 1 and the balance block 2 in this embodiment. The balance block 2 is detachably fixedly connected to one of the cranks 1, such as by bolt connection or key connection. By providing the balance block 2 in this embodiment, the air resistance of the balance block 2 is smaller during the rotation of the crankshaft, thereby reducing energy loss.

[0034] Optionally, to further ensure the dynamic balance during the rotation of the crankshaft, multiple balance weights 2 in this embodiment are provided. The multiple balance weights 2 are spaced apart along the axis direction of the main journal of the crankshaft and are connected to the corresponding crank 1.

[0035] The present utility model provides an engine, including the crankshaft in this embodiment. By providing the crankshaft in this embodiment, the energy loss during the operation of the engine is reduced, thereby improving the fuel economy of the engine.

[0036] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model and are not limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A balancing weight, characterized in that: The invention comprises a main body (21) and a wind-breaking portion (23), wherein the main body (21) is a fan-shaped annular structure, and along the radial direction of the main body (21), the thickness of the main body (21) from one end close to the center of the fan-shaped annular structure toward the other end away from the center gradually decreases, and the wind-breaking portion (23) is arranged at at least one end of the main body (21), and the wind-breaking portion (23) is integrated with the main body (21), and the wind-breaking portion (23) extends along the radial direction of the main body (21), and the wind-breaking portion (23) is provided with a large end and a small end, and along the circumferential direction of the main body (21), the large end is connected to the end of the main body (21), and the small end is located at the end of the wind-breaking portion (23) away from the main body (21).

2. The balancing weight according to claim 1, characterized in that: The number of the wind-breaking portions (23) is two, and the two wind-breaking portions (23) are respectively arranged at two ends of the main body (21).

3. The balancing weight according to claim 1, characterized in that: Both sides of the main body (21) are provided with truncated cone-shaped walls (211), the two truncated cone-shaped walls (211) are symmetrically arranged, a rounded corner portion (22) is arranged between the two truncated cone-shaped walls (211), the rounded corner portion (22) extends along the circumference of the main body (21), and the two ends of the rounded corner portion (22) are respectively connected to the two truncated cone-shaped walls (211).

4. The balancing weight according to claim 3, characterized in that: Both sides of the wind-breaking portion (23) are provided with wind-breaking walls (231), and the two wind-breaking walls (231) are symmetrically arranged. Along the circumferential direction of the main body (21), the two wind-breaking walls (231) are connected at one end away from the main body (21) to form a wind-breaking edge.

5. The balancing weight according to claim 4, characterized in that: A transition portion (24) is also provided between the main body portion (21) and the wind-breaking portion (23), and two ends of the transition portion (24) are respectively connected to the main body portion (21) and the wind-breaking portion (23).

6. The balancing weight according to claim 5, characterized in that: The transition portion (24) is provided with a transition wall, and the two ends of the transition wall are respectively connected to the truncated cone-shaped wall (211) and the wind-breaking wall (231), and the curvature of the transition wall increases along the direction from the small end of the wind-breaking portion (23) toward the large end, and the curvature at the connection position between the transition wall and the truncated cone-shaped wall (211) is equal to the curvature of the truncated cone-shaped wall (211).

7. The balancing weight according to claim 1, characterized in that: Both sides of the main body (21) are provided with truncated cone-shaped walls (211), and the two truncated cone-shaped walls (211) are symmetrically arranged. Along the radial direction of the main body (21), the two truncated cone-shaped walls (211) are connected at one end located at the outer edge of the main body (21) to form an outer edge cutting edge.

8. A crankshaft, comprising a crank (1), characterized in that It also comprises a balancing weight (2) as claimed in any one of claims 1 to 7, wherein the balancing weight (2) is fixedly connected to the crank (1).

9. The crankshaft according to claim 8, characterized in that The balancing block (2) is arranged in plurality, and the plurality of balancing blocks (2) are distributed at intervals along the axial direction of the main journal of the crankshaft.

10. An engine, characterized in that A crankshaft comprising any one of claims 8 to 9.

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