Assembled crankshaft

Abstract

The utility model discloses an assembly type crankshaft which comprises a mandrel and at least one flange, the flange is provided with a penetrating through hole, the mandrel is provided with installation positions matched with the flange in number one by one, the penetrating through hole is provided with at least one key opening, the installation positions are provided with key blocks matched with the key openings, and the key blocks are arranged on the installation positions. And a limiting assembly for limiting the movement of the flange is arranged on the mounting position. The crankshaft has the advantages that detachable assembly of the crankshaft is achieved, and compared with a crankshaft of an integrally-formed structure, the machining and production difficulty is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of spare parts processing and production, and particularly relates to an assembled crankshaft. Background Art

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

[0003] For the crankshafts in the prior art, they all adopt an integrally formed structure. However, since the crankshaft has an irregular shape, adopting an integrally formed structure greatly increases the processing and production difficulty of the crankshaft.

[0004] Therefore, it is necessary to propose an assembled crankshaft to achieve the detachable assembly of the crankshaft. Compared with the integrally formed crankshaft, the processing and production difficulty is greatly reduced. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and propose an assembled crankshaft to achieve the detachable assembly of the crankshaft. Compared with the integrally formed crankshaft, the processing and production difficulty is greatly reduced.

[0006] The purpose of the utility model is realized by the following technical solutions: an assembled crankshaft includes a core shaft and at least one flange. A through hole is provided in the flange, and the core shaft is provided with mounting positions that match the number of flanges one by one. At least one keyway is provided in the through hole, and a key block that matches the keyway is provided at the mounting position. A limiting component for restricting the movement of the flange is provided at the mounting position.

[0007] One end of the core shaft is provided with positioning holes that match the number and position of the flanges one by one and are used to assist in the installation of the flanges.

[0008] The limiting component includes a limiting opening and a limiting step provided on the core shaft. The limiting step and the limiting opening are respectively arranged on both sides of the mounting position, and a blocking block is detachably arranged on the limiting opening.

[0009] The blocking block is arranged at the limiting opening through a bolt.

[0010] The limiting component includes a positioning block arranged at the mounting position, and the positioning block is detachably connected to the flange through a bolt.

[0011] The through hole is provided at the eccentric position of the flange.

[0012] The beneficial effects of the present utility model are as follows: By providing a limiting component, an installation position, etc., the flange can be detachably installed on the mandrel, so that the mandrel, the flange, etc. can be processed separately. After the processing is completed, they are assembled together. Compared with the integrally formed crankshaft, the overall processing and production difficulty is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the present utility model;

[0014] Figure 2 Schematic diagram of the left end of the mandrel;

[0015] Figure 3 Schematic diagram of the first flange;

[0016] Figure 4 Schematic diagram of the third flange;

[0017] Figure 5 For Figure 1 Enlarged view of part A in

[0018] In the figure, 1, mandrel; 2, first flange; 3, second flange; 4, third flange; 5, fourth flange; 6, first installation position; 7, second installation position; 8, third installation position; 9, fourth installation position; 10, through hole; 11, keyway; 12, key block; 13, positioning hole; 14, limiting port; 15, limiting step; 16, stop block; 17, bolt; 18, positioning block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0020] It should be noted that the orientation concepts of "left", "right", "up", "down", "front", "rear", "inner", and "outer" in the following solutions are all relative directions, and will not be listed one by one here.

[0021] An assembled crankshaft, refer to Figures 1-5, including a mandrel 1. Three positioning holes 13 are provided at the front end of the mandrel 1. The three positioning holes 13 are at the centers of four flanges and are used to assist in installing the flanges on the mandrel 1. Along its elongation direction, the mandrel 1 is successively provided with a first mounting position 6, a second mounting position 7, a third mounting position 8, and a fourth mounting position 9. A first flange 2 matching it is installed on the first mounting position 6, a second flange 3 matching it is installed on the second mounting position 7, a third flange 4 matching it is installed on the third mounting position 8, and a fourth flange 5 matching it is installed on the fourth mounting position 9.

[0022] A through hole 10 is opened on the first flange 2. The through hole 10 is located at the eccentric position of the first flange 2, and a keyway 11 is opened on the through hole 10. A key block 12 matching the position, shape, and size of the keyway 11 is provided on the first mounting position 2. A positioning block 18 is provided on the first mounting position 2. A bolt 17 is threadedly rotated through the positioning block 18, and the bolt 17 is threadedly rotated and installed on the first flange 2, so that the first flange 2 is fixedly connected to the positioning block 18.

[0023] The second flange 3 and the fourth flange 5 have the same shape, and through holes 10 are opened at their eccentric positions, and a keyway 11 is opened on the through holes 10. Limiting steps 15 and limiting ports 14 are respectively provided on both sides of the second mounting position 7 and the fourth mounting position 9.

[0024] A through hole 10 is opened at the center of the third flange 4, and symmetrical keyways 11 are opened on both sides of the through hole 10. Limiting steps 15 and limiting ports 14 are respectively provided on both sides of the third mounting position 8.

[0025] The flange is closely abutted against the limiting step 15. A retaining block 16 is detachably provided on the limiting port 14 through a bolt 17. The retaining block 16 is closely abutted against the flange, so as to cooperate with the limiting step 15 to lock the flange and prevent it from moving back and forth.

[0026] After all components are processed, before assembly, all parts are cleaned, and all edge burrs, screw hole impurities, oil stains, etc. are removed; the mating dimensions of the flange and the shaft are measured, and those with an interference amount of 0.15 - 0.22 mm are selected for hot fitting; first, the second flange 3 is hot-fitted, and after cooling for 30 minutes, the first flange 2 is hot-fitted; after complete cooling, the positioning block 18 and the retaining block 16 are installed; then the third flange 4 is hot-fitted, and after cooling for 30 minutes, the fourth flange 5 is hot-fitted; after complete cooling, the retaining block 16 is installed. When heating, the flange is supported flat by channel steel below to make the flange heat evenly.

[0027] Since the assembly of each part uses interference fit (hot fitting) and key connection is added, the connection strength of each part is good. The mandrel 1 is integrally forged, heat-treated, and machined. There is no hole in the core part. This mandrel is not a hollow crankshaft and has high strength.

[0028] The above are only the preferred embodiments of the present utility model. It should be understood that the present utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above description or the technology or knowledge in related fields. Any changes and variations made by those skilled in the art without departing from the spirit and scope of the present utility model shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. An assembled crankshaft, comprising a core shaft and at least one flange, wherein through holes are formed in the flange, and characterized in that, The mandrel is provided with mounting positions that match the number of flanges one by one. At least one keyway is formed in the through hole. A key block that matches the keyway is provided on the mounting position. A limiting component for restricting the movement of the flange is provided on the mounting position.

2. The assembled crankshaft according to claim 1, wherein: One end of the mandrel is provided with positioning holes that match the number and position of the flanges one by one and are used to assist in the installation of the flanges.

3. The assembled crankshaft according to claim 1, characterized in that: The limiting component includes a limiting port and a limiting step formed on the mandrel. The limiting step and the limiting port are respectively arranged on both sides of the mounting position. A stop block is detachably arranged on the limiting port.

4. The assembled crankshaft according to claim 3, wherein: The stop block is arranged at the limiting port through a bolt.

5. The assembled crankshaft according to claim 1, characterized in that: The limiting component includes a positioning block arranged at the mounting position. The positioning block is detachably connected to the flange through a bolt.

6. The assembled crankshaft according to claim 1, wherein: The through hole is formed at the eccentric position of the flange.

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