Multi-section adjustable crankshaft

Abstract

The utility model discloses a multi-section adjustable crankshaft, which belongs to the technical field of crankshafts and comprises a main journal, crank connecting seats fixedly connected to two ends of the main journal, crank pins fixedly connected with the crank connecting seats, a front end shaft and a rear end shaft. Bosses are fixedly connected to the outer wall of the front end shaft and the outer wall of the rear end shaft, first balance blocks are fixedly connected to the outer walls of the bosses, screw holes are formed in the middles of the first balance blocks, and the first balance blocks can be in butt joint with the first conical positioning blocks through the conical concave holes, so that the assembly holes correspond to the screw holes. After the first balance block and the second balance block are assembled, the hexagon bolts are inserted into the inner sides of the assembly holes and are in threaded connection with the screw holes to fix the second balance block, corresponding centrifugal force can be generated, the purpose of counteracting corresponding unbalanced force is achieved, after the first balance block and the second balance block are well positioned, adjustment is not needed, and installation and adjustment are quite convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshafts, and more specifically to a multi-stage adjustable crankshaft. Background Art

[0002] The crankshaft is the most important part of the engine. It bears the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine. The crankshaft is subjected to the combined effects of the centrifugal force of the rotating mass, the periodically changing gas inertia force and the reciprocating inertia force, which makes the crankshaft subject to bending and torsion loads. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the journal surface must be wear-resistant, work evenly and have good balance.

[0003] Patent authorization number CN214395587U discloses an adjustable compressor crankshaft balance block structure, including a balance block, a balance block connecting bolt and a crankshaft body. The balance block is arc-shaped and has equally spaced threaded holes. Multiple balance blocks can be connected as a whole through balance block connecting bolts and fixed on the boss of the crankshaft optical axis section. This structure can quickly replace balance blocks of different masses, thereby generating different centrifugal forces to offset the unbalanced forces generated by the connecting rod and the piston in various compression conditions, thereby ensuring the dynamic balance performance of the crankshaft. At the same time, the upper and lower balance blocks are fixed on the boss of the crankshaft optical axis section by bolt connection, which can avoid opening crankshaft holes for installing balance blocks and ensure the strength of the crankshaft.

[0004] However, in patent authorization No. CN214395587U, the first balancing block cooperates with the arc-shaped step of the crankshaft optical axis section through the wedge groove, so that the first balancing block is initially fixed on the boss of the crankshaft optical axis section, and the second balancing block cooperates with the arc-shaped step of the first balancing block through the wedge groove, so that itself is initially fixed together with the first balancing block. Similarly, the first balancing block, the second balancing block, the third balancing block, and the fourth balancing block can be connected together. Since the balancing blocks are spliced ​​with each other through the wedge groove and the wedge block, and the wedge groove and the wedge block correspond to the axial position of the shaft end, it is easy to have deviations between the assembly holes of the balancing blocks after they are spliced, and then the bolts cannot be assembled. The balancing blocks also need to be aligned, which is very inconvenient to adjust. Therefore, we propose a multi-section adjustable crankshaft to solve the above-mentioned problems. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a multi-stage adjustable crankshaft, which can be connected with the first conical positioning block through a conical recessed hole, so that the assembly hole and the screw hole correspond to each other, and then the hexagonal bolt is inserted into the inner side of the assembly hole and screwed with the screw hole to fix the second balancing block, so as to generate corresponding centrifugal force, thereby achieving the purpose of offsetting the corresponding unbalanced force. After the first balancing block and the second balancing block are positioned, no adjustment is required, and the installation and adjustment are very convenient.

[0007] 2. Technical solution

[0008] To solve the above problems, the utility model adopts the following technical solutions.

[0009] A multi-stage adjustable crankshaft comprises a main journal, a crank connection seat fixedly connected to both ends of the main journal, a crank pin fixedly connected to the crank connection seat, a front end shaft and a rear end shaft, wherein the outer walls of the front end shaft and the rear end shaft are fixedly connected with bosses;

[0010] A first balancing block is fixedly connected to the outer wall of the boss, a screw hole is provided in the middle of the first balancing block, and first conical positioning blocks fixedly connected to the outer surface of the first balancing block are provided on both sides of the screw hole;

[0011] The outer wall of the first balancing block is detachably connected to the second balancing block, a mounting hole is provided in the middle of the second balancing block, and second conical positioning blocks fixedly connected to the outer surface of the second balancing block are provided on both sides of the mounting hole, and a conical concave hole is provided on the surface of the second balancing block close to the first balancing block, and the conical concave hole and the first conical positioning block form an embedded structure;

[0012] A hexagonal bolt screwed with the screw hole is installed inside the assembly hole.

[0013] Furthermore, a spring washer is sleeved on one end of the hexagonal bolt close to the nut, and the spring washer abuts against the nut.

[0014] Furthermore, a flat washer is sleeved on one side of the spring washer, and the flat washer is tightly fitted with the spring washer and the second balancing block respectively.

[0015] Furthermore, the first balancing block and the second balancing block are both arranged in an arc-shaped structure.

[0016] Furthermore, the axis center line of the screw hole and the axis center line of the assembly hole are located on the same straight line.

[0017] Furthermore, the first balancing blocks arranged at the front end shaft and the rear end shaft are arranged in opposite directions.

[0018] Furthermore, the length of the hexagonal bolt is adapted to the stacking thickness of the first balancing block and the second balancing block.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) In this solution, the side of the second balancing block provided with the conical concave hole is fitted with the first balancing block, and the conical concave hole is connected to the first conical positioning block, so that the assembly hole corresponds to the screw hole, and then the hexagonal bolt is inserted into the inner side of the assembly hole and screwed with the screw hole to fix the second balancing block, so that the corresponding centrifugal force can be generated, thereby achieving the purpose of offsetting the corresponding unbalanced force. After the first balancing block and the second balancing block are positioned, no adjustment is required, and the installation and adjustment are very convenient.

[0022] (2) In this solution, the hexagonal bolt is screwed in until it cannot be screwed in any further. The spring washer and the flat washer can effectively prevent the hexagonal bolt from loosening, thereby ensuring the installation stability of the second balancing weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0024] Figure 2 It is a schematic diagram of the disassembly of the utility model;

[0025] Figure 3 It is a side view schematic diagram of the first balancing weight and the second balancing weight of the utility model;

[0026] Figure 4 It is a schematic cross-sectional view of the AA portion of the first balancing block and the second balancing block of the utility model;

[0027] Figure 5 It is a schematic diagram of the hexagonal bolt structure of the utility model.

[0028] Description of the numbers in the figure:

[0029] 1. Main journal; 2. Crank connecting seat; 3. Crank pin; 4. Front end shaft; 5. Rear end shaft; 6. Boss; 7. First balancing block; 8. Screw hole; 9. First conical positioning block; 10. Second balancing block; 11. Assembly hole; 12. Second conical positioning block; 13. Conical recessed hole; 14. Hexagonal bolt; 15. Spring washer; 16. Flat washer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0031] Example:

[0032] See also Figure 1-5 , a multi-stage adjustable crankshaft, comprising a main journal 1, a crank connection seat 2 fixedly connected to both ends of the main journal 1, a crank pin 3 fixedly connected to the crank connection seat 2, a front end shaft 4 and a rear end shaft 5, and the outer walls of the front end shaft 4 and the rear end shaft 5 are fixedly connected with a boss 6;

[0033] The outer wall of the boss 6 is fixedly connected with a first balancing block 7, a screw hole 8 is provided in the middle of the first balancing block 7, and first conical positioning blocks 9 fixedly connected to the outer surface of the first balancing block 7 are provided on both sides of the screw hole 8;

[0034] The outer wall of the first balancing block 7 is detachably connected to the second balancing block 10, a mounting hole 11 is provided in the middle of the second balancing block 10, and second conical positioning blocks 12 fixedly connected to the outer facade of the second balancing block 10 are provided on both sides of the mounting hole 11, and a conical concave hole 13 is provided on the surface of the second balancing block 10 close to the first balancing block 7, and the conical concave hole 13 and the first conical positioning block 9 form an embedded structure;

[0035] A hexagonal bolt 14 is installed inside the assembly hole 11 and is screwed to the screw hole 8;

[0036] It should be noted that when the multi-stage adjustable crankshaft is in use, the number of balancing blocks on the boss 6 at the front end shaft 4 and the rear end shaft 5 is adjusted according to the unbalanced force generated by the engine piston and the connecting rod under different compression conditions to generate corresponding centrifugal force, so as to offset the unbalanced force under different compression conditions. By fitting the side of the second balancing block 10 provided with a conical recessed hole 13 with the first balancing block 7, and at the same time making the conical recessed hole 13 contact the first conical positioning block 9, so that the assembly hole 11 corresponds to the screw hole 8, and then the hexagonal bolt 14 is inserted into the inner side of the assembly hole 11 and screwed with the screw hole 8, the second balancing block 10 is fixed, so that the corresponding centrifugal force can be generated, thereby achieving the purpose of offsetting the corresponding unbalanced force. After the first balancing block 7 and the second balancing block 10 are positioned, no adjustment is required, and the installation and adjustment are very convenient.

[0037] like Figure 2 , Figure 5As shown, a spring washer 15 is sleeved on one end of the hexagonal bolt 14 close to the nut, and the spring washer 15 abuts against the nut, and a flat washer 16 is sleeved on one side of the spring washer 15, and the flat washer 16 is tightly fitted with the spring washer 15 and the second balance block 10 respectively;

[0038] It should be noted that by screwing the hexagonal bolt 14 until it cannot be screwed in any further, the spring washer 15 and the flat washer 16 can effectively prevent the hexagonal bolt 14 from loosening, thereby ensuring the installation stability of the second balancing weight 10 .

[0039] like Figure 1 As shown, the first balancing block 7 and the second balancing block 10 are both arranged in an arc-shaped structure, and the first balancing block 7 arranged at the front end shaft 4 and the rear end shaft 5 are arranged in opposite directions;

[0040] It should be noted that according to the unbalanced force generated by the engine piston and connecting rod under different compression conditions, the number of balancing blocks on the boss 6 at the front end shaft 4 and the rear end shaft 5 is adjusted to generate corresponding centrifugal force to offset the unbalanced force under different compression conditions.

[0041] like Figure 2 , Figure 4 , Figure 5 As shown, the axis of the screw hole 8 and the axis of the assembly hole 11 are located on the same straight line, and the length of the hexagonal bolt 14 is adapted to the stacking thickness of the first balancing block 7 and the second balancing block 10;

[0042] It should be noted that, by inserting the hexagonal bolt 14 into the inner side of the assembly hole 11 and screwing it with the screw hole 8, the second balancing block 10 is fixed, which can generate corresponding centrifugal force, thereby achieving the purpose of offsetting the corresponding unbalanced force. After the first balancing block 7 and the second balancing block 10 are positioned, no adjustment is required, and the installation and adjustment are very convenient.

[0043] When in use: according to the unbalanced force generated by the engine piston and connecting rod under different compression conditions, the number of balancing blocks on the boss 6 at the front end shaft 4 and the rear end shaft 5 is adjusted to generate corresponding centrifugal force, so as to offset the unbalanced force under different compression conditions. By fitting the side of the second balancing block 10 provided with the conical recessed hole 13 with the first balancing block 7, and at the same time making the conical recessed hole 13 contact with the first conical positioning block 9, so that the assembly hole 11 corresponds to the screw hole 8, and then the hexagonal bolt 14 is inserted into the inner side of the assembly hole 11 and screwed with the screw hole 8, the second balancing block 10 is fixed, so that the corresponding centrifugal force can be generated, thereby achieving the purpose of offsetting the corresponding unbalanced force.

[0044] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A multi-stage adjustable crankshaft, comprising a main journal (1), a crank connection seat (2) fixedly connected to both ends of the main journal (1), a crank pin (3) fixedly connected to the crank connection seat (2), a front end shaft (4) and a rear end shaft (5), characterized in that: The outer walls of the front end shaft (4) and the rear end shaft (5) are both fixedly connected with a boss (6); A first balancing block (7) is fixedly connected to the outer wall of the boss (6); a screw hole (8) is provided in the middle of the first balancing block (7); and first conical positioning blocks (9) are fixedly connected to the outer surface of the first balancing block (7) on both sides of the screw hole (8); The outer wall of the first balancing block (7) is detachably connected to a second balancing block (10); a mounting hole (11) is provided in the middle of the second balancing block (10); second conical positioning blocks (12) are provided on both sides of the mounting hole (11) and are fixedly connected to the outer surface of the second balancing block (10); a conical concave hole (13) is provided on the surface of the second balancing block (10) close to the first balancing block (7); and the conical concave hole (13) and the first conical positioning block (9) form an embedded structure; A hexagonal bolt (14) threadedly connected to the screw hole (8) is installed inside the assembly hole (11).

2. The multi-stage adjustable crankshaft according to claim 1, characterized in that: An elastic washer (15) is sleeved on one end of the hexagonal bolt (14) close to the nut, and the elastic washer (15) is in contact with the nut.

3. The multi-stage adjustable crankshaft according to claim 2, characterized in that: A flat washer (16) is sleeved on one side of the spring washer (15), and the flat washer (16) is tightly fitted to the spring washer (15) and the second balancing block (10) respectively.

4. The multi-stage adjustable crankshaft according to claim 1, characterized in that: The first balancing block (7) and the second balancing block (10) are both arranged in an arc-shaped structure.

5. The multi-stage adjustable crankshaft according to claim 1, characterized in that: The axis center line of the screw hole (8) and the axis center line of the assembly hole (11) are located on the same straight line.

6. The multi-stage adjustable crankshaft according to claim 1, characterized in that: The first balancing block (7) provided at the front end shaft (4) and the rear end shaft (5) is arranged in opposite directions.

7. The multi-stage adjustable crankshaft according to claim 1, characterized in that: The length of the hexagonal bolt (14) is adapted to the stacking thickness of the first balancing weight (7) and the second balancing weight (10).

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