An assembled crankshaft

Abstract

The utility model discloses an assembly type crankshaft, including driving crank, driven crank and two balance blocks. The center of two balance blocks all is provided with the installation through -hole, and driving crank, driven crank are inserted in corresponding installation through -hole respectively. Two balance blocks are spaced apart, and are provided with connecting rod needle bearing between. Connecting rod needle bearing is divided into the installation part of middle and the insertion part of both ends. The insertion hole is set up on two balance blocks. The insertion hole eccentricity sets up on the balance block. Two insertion parts on connecting rod needle bearing are inserted in corresponding insertion hole. The utility model discloses through dividing crankshaft into driving crank, driven crank, connecting rod needle bearing and two balance blocks, and through the insertion type assembly between, make crankshaft be combined by multiple independent sections, and effectively solve the problem that integral type crankshaft processes difficultly.

Description

Technical Field

[0001] This utility model belongs to the field of automotive compressor technology, specifically relating to an assembled crankshaft. Background Technology

[0002] In the existing technology, air compressors are commonly used equipment for producing compressed air, with piston air compressors being the most common type. Air compressors are driven by an electric motor. When the motor drives the crankshaft to rotate, the crankshaft, through the transmission of the connecting rod, drives the piston to reciprocate within the cylinder, thereby compressing the air.

[0003] Most existing air compressor crankshafts are one-piece crankshafts, consisting of main journals and crank pins eccentric to the main journals, with the crank pins connecting to the connecting rods. The main journals are located at both ends of the crank pins. This one-piece crankshaft structure creates at least two bending sections, making disassembly and assembly of the crankshaft, connecting rods, and bearings difficult within the confined space of the crankcase. Furthermore, one-piece crankshafts face limitations in manufacturing molds and processing, are difficult to maintain, and have high material costs, thus limiting their practical application. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides an assembled crankshaft to solve the technical problems of difficult crankshaft manufacturing and installation.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0006] An assembled crankshaft includes a driving crank, a driven crank, and two balance weights. Each of the two balance weights has a mounting through hole at its center, into which the driving crank and driven crank are respectively inserted.

[0007] The two balance blocks are spaced apart, with a connecting rod needle roller bearing positioned between them. The connecting rod needle roller bearing consists of a central mounting section and two end insertion sections. Each balance block has an insertion hole, which is eccentrically positioned on the balance block. The two insertion sections on the connecting rod needle roller bearing are inserted into the corresponding insertion holes.

[0008] Furthermore, the central axes of the driving crank and the driven crank coincide.

[0009] Furthermore, the two balance blocks are symmetrically arranged on both sides of the connecting rod needle roller bearing.

[0010] Furthermore, the balance block is divided into an upper connecting part and a lower balancing part. The balancing part has a fan-shaped structure. A mounting through hole is located at the center of the balancing part. A plug-in hole is formed on the connecting part.

[0011] Furthermore, the driving crank, driven crank, and corresponding mounting through holes are interference-fitted.

[0012] Furthermore, the insertion portion on the connecting rod needle roller bearing is interference-fitted with the corresponding insertion hole.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] This invention divides the crankshaft into a driving crank, a driven crank, a connecting rod needle roller bearing, and two balance weights, which are assembled by plug-in joints. This allows the crankshaft to be composed of multiple independent sections, effectively solving the problem of difficult machining of a one-piece crankshaft. Furthermore, the modular assembly of the crankshaft allows each component to be assembled individually into the air compressor, facilitating the installation of the piston crank and reducing the difficulty of crankshaft installation. Simultaneously, it enables the replacement of individual components; when a single component is damaged, only the damaged component needs to be replaced, reducing maintenance costs and shortening downtime. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the balance block in this utility model. Figure 1 (Enlarged view of part A in the middle)

[0017] Figure 3 This is a schematic diagram of the present invention installed in an air compressor.

[0018] Reference numerals: 1. Driving crank; 2. Driven crank; 3. Balance block; 3-1. Connecting part; 3-2. Balance part; 4. Connecting rod needle roller bearing; 5. Transmission crank. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 and 2As shown, an assembled crankshaft includes a driving crank 1, a driven crank 2, and two balance blocks 3. Each of the two balance blocks 3 has a mounting through hole at its center, and the driving crank 1 and the driven crank 2 are respectively inserted into the corresponding mounting through hole.

[0022] Two balance blocks 3 are spaced apart, with a connecting rod needle roller bearing 4 positioned between them. The connecting rod needle roller bearing 4 consists of a central mounting section and two end insertion sections. Insertion holes are provided on both balance blocks 3. These insertion holes are eccentrically positioned on the balance blocks 3. The two insertion sections on the connecting rod needle roller bearing 4 are inserted into the corresponding insertion holes.

[0023] like Figure 3 As shown, during assembly, one of the insertion parts of the connecting rod needle roller bearing 4 is first inserted into the corresponding insertion hole. Then, the end of the transmission crank 5 from the air compressor is fitted over the outer ring of the mounting part of the connecting rod needle roller bearing 4. Finally, the other insertion part of the connecting rod needle roller bearing 4 is inserted into the corresponding insertion hole.

[0024] Furthermore, there is an interference fit between the insertion part on the connecting rod needle roller bearing 4 and the corresponding insertion hole, as well as between the driving crank 1, the driven crank 2 and the corresponding mounting through hole. The central axes of the driving crank 1 and the driven crank 2, which are mounted on the corresponding balance block 3, coincide, thereby ensuring the smooth operation of the driving crank 1 and the driven crank 2 during transmission.

[0025] In this embodiment, the ends of the driving crank 1 and the driven crank 2, as well as the openings of the mounting through holes, are all chamfered to facilitate the insertion of the driving crank 1 and the driven crank 2 into the corresponding mounting through holes.

[0026] like Figure 2 As shown, two balance blocks 3 are symmetrically arranged on both sides of the connecting rod needle roller bearing 4. The balance block 3 is divided into an upper connecting part 3-1 and a lower balance part 3-2. The balance part 3-2 has a fan-shaped structure. The mounting through hole is located at the center of the balance part 3-2. The insertion hole is opened on the connecting part 3-1, forming an eccentric structure with the connecting rod needle roller bearing 4.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An assembled crankshaft, characterized in that: It includes a driving crank (1), a driven crank (2) and two balance blocks (3); each of the two balance blocks (3) has a mounting through hole at its center, and the driving crank (1) and the driven crank (2) are respectively inserted into the corresponding mounting through hole; Two balance blocks (3) are spaced apart, with a connecting rod needle bearing (4) between them; the connecting rod needle bearing (4) is divided into a middle mounting part and two end insertion parts; both balance blocks (3) are provided with insertion holes; the insertion holes are eccentrically set on the balance blocks (3); the two insertion parts on the connecting rod needle bearing (4) are inserted into the corresponding insertion holes.

2. The assembled crankshaft according to claim 1, characterized in that: The central axes of the driving crank (1) and the driven crank (2) coincide.

3. The assembled crankshaft according to claim 1, characterized in that: The two balance blocks (3) are symmetrically arranged on both sides of the connecting rod needle roller bearing (4).

4. The assembled crankshaft according to claim 1, characterized in that: The balance block (3) is divided into an upper connecting part (3-1) and a lower balancing part (3-2); the balancing part (3-2) has a fan-shaped structure; the mounting through hole is located at the center of the balancing part (3-2); the insertion hole is opened on the connecting part (3-1).

5. The assembled crankshaft according to claim 1, characterized in that: The driving crank (1), driven crank (2) and the corresponding mounting through hole are interference fit.

6. The assembled crankshaft according to claim 1, characterized in that: The insertion part on the connecting rod needle roller bearing (4) is interference-fitted with the corresponding insertion hole.

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