Crankshaft

Abstract

The utility model discloses a crankshaft, and belongs to the field of crankshafts. Comprising a shaft body and a disc body which are fixedly connected with each other, the shaft body is used for forming a key groove; the disc body is used for forming a connecting hole which is parallel to the axis of the shaft body and is different from the axis of the shaft body; wherein the bottom surface of the key groove is an arc-shaped surface. The key slot has the beneficial effects that the key slot is arc-shaped, so that the utilization rate of the key slot is improved, the key slot can meet the use requirements of keys with different sizes, and the universality is improved.

Description

Technical Field

[0001] This application relates to the field of crankshafts, and more specifically, to a crankshaft. Background Technology

[0002] The crankshaft is the most important component in an engine. It bears the force transmitted from the connecting rods and converts it into torque, which is then output through the crankshaft to drive other accessories on the engine.

[0003] Keyways are commonly required on crankshafts. The purpose of keyways is to allow for the fixing of other parts, such as gears, pulleys, or bushings. However, most common keyways are designed for use with flat keys, resulting in low versatility and inefficiency. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section above, some embodiments of this application provide a crankshaft, comprising: a shaft body and a disc body fixedly connected to each other; the shaft body is used to form a keyway; the disc body is used to form a connecting hole parallel to and opposite to the axis of the shaft body; wherein the bottom surface of the keyway is an arc-shaped surface.

[0006] Furthermore, the shaft body includes at least one tapered shaft segment with a taper; the keyway is disposed on the tapered shaft segment.

[0007] Furthermore, the two ends of the arc-shaped surface are connected to the surface of the tapered shaft segment.

[0008] Furthermore, the shaft also includes at least two vertical shaft segments; both vertical shaft segments are connected to the tapered shaft segment; one vertical shaft segment is connected to one end of the tapered shaft segment, and the other vertical shaft segment is used to connect the other end of the tapered shaft segment to the disc body.

[0009] Furthermore, the keyway also forms two bearing surfaces that connect with the arcuate surface; the bearing surfaces are perpendicular to the arcuate surface.

[0010] Furthermore, the shape of the arcuate surface conforms to the outer surface of a cylinder.

[0011] Furthermore, the connecting holes and the keyways are distributed at 90° intervals.

[0012] Furthermore, the keyway is formed at the end of the tapered shaft segment away from the disc body.

[0013] Furthermore, the length of the tapered shaft segment is 20a; the distance between the center of the arc surface and the end of the tapered shaft segment is 7a; the diameter of the arc surface is 25.4a; the distance between the two bearing surfaces is 3a; where a is a constant.

[0014] Furthermore, the maximum depth of the keyway is 1.8a.

[0015] The beneficial effects of this application are: by using an arc-shaped keyway, the utilization rate of the keyway is improved, enabling the keyway to meet the needs of keys of different sizes and increasing its versatility. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0017] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0018] In the attached diagram:

[0019] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0020] Figure 2 This is a structural schematic diagram of a part of the embodiment, mainly showing the specific shape and structure of the keyway;

[0021] Figure 3 This is a structural diagram of a part of an embodiment, mainly showing the structure of the disk body.

[0022] Figure label:

[0023] 1. Shaft body; 2. Disc body; 3. Keyway; 4. Connecting hole; 5. Arc surface; 6. Tapered shaft section; 7. Vertical shaft section; 8. Bearing surface. Detailed Implementation

[0024] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0025] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0026] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0027] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0028] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Reference Figure 1-2 ,

[0030] A crankshaft includes a shaft body and a disc body fixedly connected to each other. The shaft body is used to form a keyway. The disc body is used to form connecting holes that are parallel to but opposite to the axis of the shaft body. The bottom surface of the keyway is arc-shaped. The arc-shaped keyway allows for the adaptation of keys of various types and sizes. For example, the arc-shaped keyway can be used to insert a flat key, and the flat key will contact the bottom surface of the arc-shaped keyway, thereby preventing the flat key from falling out.

[0031] Specifically, the shaft body includes at least one tapered shaft segment with a taper; the keyway is disposed on the tapered shaft segment. In actual use, the keyway can be made deeper to avoid affecting the torsional limit of the shaft end itself. Furthermore, being disposed on the tapered shaft segment allows for better mating with other holes.

[0032] Specifically, the two ends of the arc-shaped surface are connected to the surface of the tapered shaft segment.

[0033] Specifically, the shaft body further includes at least two vertical shaft segments; both vertical shaft segments are connected to the tapered shaft segment; one vertical shaft segment is connected to one end of the tapered shaft segment, and the other vertical shaft segment is used to connect the other end of the tapered shaft segment to the disc body.

[0034] Specifically, the keyway also forms two bearing surfaces that connect with the arc-shaped surface; the bearing surfaces are perpendicular to the arc-shaped surface.

[0035] Specifically, the shape of the arc-shaped surface is fitted to the outer surface of a cylinder, that is, the arc-shaped surface is a circular surface, which reduces the processing cost.

[0036] Specifically, the connecting holes and the keyways are spaced 90° apart. This is primarily to ensure dynamic balance stability, resulting in a more uniform mass distribution and more stable operation during rotation.

[0037] Specifically, the keyway is formed at the end of the tapered shaft segment away from the disk body.

[0038] Specifically, the length of the tapered shaft segment is 20a; the distance between the center of the arc surface and the end of the tapered shaft segment is 7a; the diameter of the arc surface is 25.4a; and the distance between the two bearing surfaces is 3a; where a is a constant.

[0039] Specifically, the maximum depth of the keyway is 1.8a.

[0040] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A crankshaft, characterized in that, include: A shaft and a disk that are fixedly connected to each other; The shaft is used to form a keyway; the disc is used to form a connecting hole that is parallel to and different from the axis of the shaft. The bottom surface of the keyway is an arc-shaped surface; The shaft body includes at least one tapered shaft segment with a taper; the keyway is disposed on the tapered shaft segment.

2. The crankshaft according to claim 1, characterized in that: The two ends of the arc-shaped surface are connected to the surface of the tapered shaft segment.

3. The crankshaft according to claim 1, characterized in that: The shaft also includes at least two vertical shaft segments; both vertical shaft segments are connected to the tapered shaft segment. One vertical shaft segment is connected to one end of the tapered shaft segment, and the other vertical shaft segment is used to connect the other end of the tapered shaft segment to the disc body.

4. The crankshaft according to claim 1, characterized in that: The keyway also forms two bearing surfaces that connect with the arc-shaped surface; The bearing surface is perpendicular to the arc-shaped surface.

5. The crankshaft according to claim 1, characterized in that: The shape of the arc-shaped surface fits the outer surface of a cylinder.

6. The crankshaft according to claim 1, characterized in that: The connecting holes and the keyways are distributed at 90° intervals.

7. The crankshaft according to claim 1, characterized in that: The keyway is located at the end of the tapered shaft section away from the disk body.

8. The crankshaft according to claim 4, characterized in that: The length of the tapered shaft segment is 20a; the distance between the center of the arc-shaped surface and the end of the tapered shaft segment is 7a; the diameter of the arc-shaped surface is 25.4a; The distance between the two bearing surfaces is 3a; Where a is a constant.

9. The crankshaft according to claim 8, characterized in that: The maximum depth of the keyway is 1.8a.

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