Crankshaft assembly

Abstract

The utility model discloses a crankshaft assembly which comprises a crankshaft, an annular crankshaft groove is formed in the crankshaft in the circumferential direction, and a crankshaft gear and a clamping block are arranged in the crankshaft groove. The crankshaft gear comprises two half gears which are oppositely arranged, each half gear is of a semicircular ring structure, the two half gears are connected through a connecting pin, and a gear gap is formed between the two half gears; a gear mounting surface A and a gear mounting surface B are respectively arranged on two side parts of the crankshaft gear; the clamping block comprises two semi-annular clamping half blocks which are oppositely arranged, the two clamping half blocks are connected through bolts, and a clamping block gap is formed between the two clamping half blocks; the gear mounting surface A is matched with the clamping block, and the gear mounting surface B is matched with the side wall of the crankshaft groove. According to the crankshaft assembly, the working stability of the crankshaft assembly can be guaranteed, the crankshaft gear is convenient to disassemble and assemble, and maintenance and replacement are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of engine parts, in particular to a crankshaft assembly. Background Art

[0002] The crankshaft gear in the prior art uses an integral structure and is connected to the crankshaft in an interference fit manner. The process of installing the crankshaft gear on the crankshaft is as follows: first, the crankshaft gear is heated and then axially installed on the crankshaft from the flywheel end; then the flywheel coupling plate is also heated and assembled on the crankshaft.

[0003] The prior art has the following disadvantages when the crankshaft gear is installed on the crankshaft:

[0004] 1) The crankshaft gear is installed axially from the flywheel end, which requires the flywheel coupling plate and the crankshaft to be a split structure;

[0005] 2) The crankshaft gear and the crankshaft, the flywheel coupling plate and the crankshaft are all connected by interference fit. The crankshaft gear and the flywheel coupling plate need to be heated during assembly. Due to their large size, the heating and insulation time is long, and the assembly efficiency is low;

[0006] 3) The contact zones between the crankshaft gear and the crankshaft, and between the flywheel coupling plate and the crankshaft are long. During actual assembly, the temperature difference between the two ends changes rapidly, and the crankshaft is tightened in advance, resulting in a reduction in the original interference fit of the middle inner hole. That is, the actual interference fit length is difficult to control, and there is a risk of spinning;

[0007] 4) If there is a need to disassemble or replace the crankshaft gear later, the crankshaft gear is difficult to disassemble and there is a risk of damaging the crankshaft journal. Summary of the invention

[0008] In order to overcome the above defects, the technical problem solved by the utility model is that the utility model provides a crankshaft assembly, which can ensure the working stability of the crankshaft assembly, and the crankshaft gear is easy to disassemble and assemble, and is convenient for maintenance and replacement.

[0009] In order to solve the above technical problems, the utility model provides a crankshaft assembly, including a crankshaft, wherein an annular crankshaft groove is circumferentially arranged on the crankshaft, and a crankshaft gear and a clamping block are arranged in the crankshaft groove; the crankshaft gear includes two relatively arranged half-side gears, both of which are semi-circular ring structures, the two half-side gears are connected by a connecting pin, and there is a gear gap between the two half-side gears; the two sides of the crankshaft gear are respectively provided with a gear mounting surface A and a gear mounting surface B; the clamping block includes two relatively arranged semi-annular clamping half blocks, the two clamping half blocks are connected by bolts, and there is a clamping block gap between the two clamping half blocks; the gear mounting surface A is installed in cooperation with the clamping block, and the gear mounting surface B is installed in cooperation with the side wall of the crankshaft groove.

[0010] Furthermore, a crankshaft locating pin hole is provided at the bottom of the crankshaft groove, and a gear locating pin hole is provided on the inner wall of one of the half gears; the crankshaft assembly also includes a locating pin, and the locating pin is simultaneously provided in the crankshaft locating pin hole and the gear locating pin hole.

[0011] Furthermore, the gear positioning pin hole extends from an end face of one side of the half gear to an end face of the other side.

[0012] Furthermore, the gear mounting surface A and the gear mounting surface B are both inclined surfaces.

[0013] Furthermore, the inclination angle of the gear mounting surface A is 15° to 45°.

[0014] Furthermore, the inclination angle of the gear mounting surface B is 15° to 45°.

[0015] Furthermore, gear error prevention marks are provided on both half gears.

[0016] Furthermore, both clamping half blocks are provided with clamping block error prevention marks.

[0017] Furthermore, a flywheel coupling disc is provided at the flywheel end of the crankshaft.

[0018] Furthermore, the flywheel coupling plate and the crankshaft are an integral structure.

[0019] After adopting the above technical scheme, the beneficial effect of the utility model is that the crankshaft assembly includes a crankshaft, an annular crankshaft groove is circumferentially arranged on the crankshaft, and a crankshaft gear and a clamping block are arranged in the crankshaft groove; the crankshaft gear includes two relatively arranged half-side gears, both of which are semi-circular ring structures, the two half-side gears are connected by a connecting pin, and there is a gear gap between the two half-side gears; the two sides of the crankshaft gear are respectively provided with a gear mounting surface A and a gear mounting surface B; the clamping block includes two relatively arranged semi-annular clamping half blocks, the two clamping half blocks are connected by bolts, and there is a clamping block gap between the two clamping half blocks; the gear mounting surface A is installed in cooperation with the clamping block, and the gear mounting surface B is installed in cooperation with the side wall of the crankshaft groove.

[0020] The crankshaft gear and the clamping block of the utility model are both split structures, which is convenient for disassembly and assembly of the crankshaft gear and for maintenance and replacement of the crankshaft gear.

[0021] The connection between the crankshaft gear and the crankshaft of the crankshaft assembly of the utility model no longer adopts the interference fit connection method in the prior art, and no heating is required. Therefore, during actual assembly, there is no problem that the temperature difference between the two ends changes rapidly, the crankshaft is clamped in advance, and the original interference amount of the middle inner hole is reduced, that is, the actual interference fit length is difficult to control, thereby effectively avoiding the risk of spinning and ensuring the stability of the crankshaft assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a stereogram of the crankshaft assembly of the utility model;

[0023] Figure 2 It is a partial cross-sectional view of the crankshaft assembly of the utility model;

[0024] Figure 3 yes Figure 1 A partial cross-sectional view of the middle crankshaft;

[0025] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle crankshaft gear;

[0026] Figure 5 yes Figure 1 A cross-sectional view of the middle crankshaft gear;

[0027] Figure 6 yes Figure 1 A three-dimensional view of the middle clamping block;

[0028] Figure 7 yes Figure 1 Structural schematic diagram of the middle clamping block;

[0029] Figure 8 yes Figure 7 A partial structure enlarged diagram of a top view;

[0030] In the figure, 1. flywheel connecting plate; 2. crankshaft; 21. crankshaft groove; 22. crankshaft locating pin hole; 3. crankshaft gear; 31. gear locating pin hole; 32. gear anti-error mark; 33. gear mounting surface A; 34. gear mounting surface B; 4. clamping block; 41. clamping block anti-error mark; 42. nut mounting surface; 43. bolt mounting hole; 44. clamping block gap; 45. clamping block mounting surface; 5. bolt; 6. nut; 7. locating pin; 8. connecting pin. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Combination Figure 1 , Figure 2 ,as well as Figure 3As shown together, a crankshaft assembly comprises a crankshaft 2 , at the flywheel end of which a flywheel coupling disc 1 is arranged.

[0033] Preferably, the flywheel coupling plate 1 and the crankshaft 2 are an integral structure.

[0034] An annular crankshaft groove 21 is circumferentially arranged on the crankshaft 2 , and a crankshaft gear 3 and a clamping block 4 are arranged in the crankshaft groove 21 .

[0035] Combination Figure 1 , Figure 2 , Figure 4 ,as well as Figure 5 As shown together, the crankshaft gear 3 includes two oppositely disposed half gears, both of which are semicircular ring structures, and the two half gears are connected by a connecting pin 8, and there is a gear gap between the two half gears.

[0036] Preferably, the bottom of the crankshaft groove 21 is provided with a crankshaft locating pin hole 22, wherein the inner wall of one half of the gear is provided with a gear locating pin hole 31. The crankshaft assembly further includes a locating pin 7, which is disposed in both the crankshaft locating pin hole 22 and the gear locating pin hole 31.

[0037] Further preferably, the gear positioning pin hole 31 deviates from the middle axis position, which can effectively avoid wrong installation.

[0038] In order to facilitate the axial movement and position adjustment of the crankshaft gear 3, it is further preferred that the gear positioning pin hole 31 extends from the end surface of one side of the half gear to the end surface of the other side.

[0039] The crankshaft gear 3 is provided with a gear mounting surface A 33 and a gear mounting surface B 34 on both sides thereof; the gear mounting surface A 33 and the gear mounting surface B 34 are preferably both inclined surfaces.

[0040] More preferably, the gear mounting surface A 33 has an inclination angle of 15° to 45°. The gear mounting surface B 34 has an inclination angle of 15° to 45°.

[0041] Gear error prevention marks 32 are provided on both half gears.

[0042] Combination Figure 1 , Figure 2 , Figure 6 , Figure 7 ,as well as Figure 8 As shown together, the clamping block 4 includes two semi-annular clamping halves arranged opposite to each other, and a nut mounting surface 42 and a bolt mounting hole 43 are also arranged on the clamping block 4. The bolt 5 is installed in the bolt mounting hole 43. The two clamping halves are connected by the bolt 5 and locked by the nut 6. An anti-loosening gasket is preferably arranged between the nut 6 and the nut mounting surface 42.

[0043] There is a clamping block gap 44 between the two clamping halves.

[0044] The clamping block 4 is provided with a clamping block mounting surface 45 , the gear mounting surface A is mounted in cooperation with the clamping block mounting surface of the clamping block, and the gear mounting surface B is mounted in cooperation with the side wall of the crankshaft groove 24 .

[0045] Both clamping half blocks are provided with clamping block error prevention marks 41.

[0046] During installation, first install the positioning pin 7 on the crankshaft 2, and then assemble the two half gears of the crankshaft gear 3 on the crankshaft 2, and use the positioning pin 7 to position in the middle. The clamping block installation surface of the clamping block 4 presses the gear installation surface A 33, and the clamping block 4 fixes the crankshaft gear 3. The clamping block 4 is tightened by the bolt 5; to prevent the bolt 5 from loosening, an anti-loosening gasket needs to be added; during the tightening process of the nut 6, it should be completed in 2-3 times to finally meet the torque requirements. Each time, it needs to be tightened crosswise and the clamping block gap 44 should be observed. The difference of the clamping block gap 44 should be kept between 0.1-0.2mm; after the assembly is completed, check the gear gap. Both sides should have a certain gear gap and be close.

[0047] The size of the gear clearance depends on the maximum difference between the inner diameter of the crankshaft gear 3 and the journal of the crankshaft 2. Taking the inner diameter of the crankshaft gear 3 φ290 (0.01, 0.05) and the journal size of the crankshaft 2 φ290 (0.01, 0.025) as an example, the gear clearance that compensates for the dimensional tolerance should be at least 0.04×3.14, that is, 0.1256, plus the compensation for roughness (Rz4) and form and position tolerance (grade 7), the final single-sided gear clearance is specified to be 0.12-0.17mm to avoid the risk of spinning due to the lack of clearance between the two half gears after the crankshaft gear 3 is assembled and the contact area between the inner surface of the crankshaft gear 3 and the crankshaft 2 is too small.

[0048] The technical features named with serial numbers involved in this specification (such as crankshaft mounting surface A, crankshaft mounting surface B, gear mounting surface A, gear mounting surface B, etc.) are only for distinguishing the various technical features and do not represent the positional relationship, installation sequence and working sequence between the various technical features.

[0049] In the description of this specification, it is necessary to understand that the orientations or positional relationships described as "circumferential", "one side", "the other side", "end face", "inner wall", "bottom of groove", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] The present utility model is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present utility model.

Claims

1. A crankshaft assembly, comprising a crankshaft, characterized in that: The crankshaft is provided with an annular crankshaft groove along the circumferential direction, and a crankshaft gear and a clamping block are arranged in the crankshaft groove; The crankshaft gear comprises two oppositely arranged half gears, both of which are semicircular ring structures, connected by a connecting pin, and there is a gear gap between the two half gears; the two sides of the crankshaft gear are respectively provided with a gear mounting surface A and a gear mounting surface B; The clamping block comprises two semi-annular clamping halves which are arranged opposite to each other, the two clamping halves are connected by bolts, and there is a clamping block gap between the two clamping halves; The gear mounting surface A is mounted in cooperation with the clamping block, and the gear mounting surface B is mounted in cooperation with the side wall of the crankshaft groove.

2. The crankshaft assembly according to claim 1, characterized in that A crankshaft locating pin hole is provided at the bottom of the crankshaft groove, and a gear locating pin hole is provided on the inner wall of one of the half gears; the crankshaft assembly also includes a locating pin, which is simultaneously provided in the crankshaft locating pin hole and the gear locating pin hole.

3. The crankshaft assembly according to claim 2, characterized in that The gear positioning pin hole extends from an end surface of one side of the half gear to an end surface of the other side.

4. The crankshaft assembly according to claim 1, characterized in that The gear mounting surface A and the gear mounting surface B are both inclined surfaces.

5. The crankshaft assembly according to claim 4, characterized in that The inclination angle of the gear mounting surface A is 15° to 45°.

6. The crankshaft assembly according to claim 4, characterized in that The inclination angle of the gear mounting surface B is 15° to 45°.

7. The crankshaft assembly according to claim 1, wherein: Gear error prevention marks are arranged on both half gears.

8. The crankshaft assembly according to claim 1, wherein: The two clamping half blocks are both provided with clamping block error prevention marks.

9. The crankshaft assembly according to claim 1, wherein: A flywheel coupling disc is arranged at the flywheel end of the crankshaft.

10. The crankshaft assembly according to claim 9, characterized in that The flywheel coupling plate and the crankshaft are an integral structure.

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