Crankshaft Structure with Front and Rear Auxiliary Support Brackets

Abstract

The present invention discloses a crankshaft structure with front and rear auxiliary support gears, which includes a crankshaft assembly and a cylinder block assembly; the crankshaft assembly is arranged inside the cylinder block assembly, and the rear crankshaft assembly includes multiple main journals of the crankshaft body, a front end auxiliary journal and a rear end auxiliary journal; the multiple main journals are evenly spaced and coaxially arranged in the middle section of the rear crankshaft body; the front end auxiliary journal and the rear end auxiliary journal are coaxially arranged with the multiple main journals at the front end and the rear end of the rear crankshaft body; the cylinder block assembly includes a front end gearbox, a rear end gearbox and multiple crankcases; the front end gearbox and the rear end gearbox are arranged at both ends of the cylinder block assembly; the multiple crankcases are evenly distributed in the middle of the cylinder block assembly and are located between the front end gearbox and the rear end gearbox; wherein the front end auxiliary journal and the rear end auxiliary journal are respectively arranged at the front end gearbox and the rear end gearbox. Thereby, the front and rear auxiliary support gears shorten the crankshaft cantilever, thus achieving higher power output.

Description

Technical Field

[0001] The present invention relates to the field of engine design and manufacturing, and particularly to a crankshaft structure with front and rear auxiliary support gears. Background Art

[0002] The main function of the crankshaft is to convert the gas pressure transmitted by the piston connecting rod assembly of the internal combustion engine into the torque output to the outside, and can drive the valve mechanism and other accessories of the internal combustion engine. The crankshaft mainly consists of a crankshaft front end, a crankshaft rear end, main journals, connecting rod journals, crank arms, balance weights, etc.

[0003] The force on the crankshaft is extremely complex, and it simultaneously bears periodically changing gas forces, inertial forces, and torques during the working process. Therefore, it is necessary to have high strength and stiffness against bending and torsion. For large-bore engines, especially V-type multi-cylinder engines, the failure rate of the crankshaft is also the highest, and the design of the crankshaft directly determines the performance and reliability of the engine.

[0004] For the traditional crankshaft structure, the main journals are mainly supported by the main bearing seats of the cylinder block. The number of main journals is generally related to the number of cylinders. For example, if the number of cylinders is 6, the number of main journals is "6 + 1". With the increase in the output power of the engine and the expansion of different uses of the engine, the failure rate of the crankshaft also increases accordingly, mainly concentrated on problems such as wear and ablation of the front and rear bearings. Since the crankshaft balance and lubrication of high-power V-type diesel engines are very complex and involve many influencing factors, it is very difficult to completely solve the reliability problem of the crankshaft only through conventional technical means (such as changing the firing order, crankshaft balance rate, crankshaft oil passage / oil hole arrangement, and bearing clearance, etc.).

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The object of the present invention is to provide a crankshaft structure with front and rear auxiliary support gears, which can, in addition to the original main journals, add an auxiliary support gear at the front and rear ends of the crankshaft respectively, further increasing the strength and stiffness of the crankshaft. The main bearing can withstand higher explosion pressures, and the front and rear auxiliary support gears shorten the crankshaft cantilever, thereby achieving higher power output.

[0007] To achieve the above object, the present invention provides a crankshaft structure with front and rear auxiliary support brackets, including a crankshaft assembly and a cylinder block assembly; the crankshaft assembly is arranged inside the cylinder block assembly, and the rear crankshaft assembly includes multiple main journals of the crankshaft body, a front-end auxiliary journal, and a rear-end auxiliary journal; the multiple main journals are evenly spaced and coaxially arranged in the middle section of the rear crankshaft body; the front-end auxiliary journal and the rear-end auxiliary journal are coaxially arranged at the front end and the rear end of the rear crankshaft body with the multiple main journals; the cylinder block assembly includes a front-end gearbox, a rear-end gearbox, and multiple crankcases; the front-end gearbox and the rear-end gearbox are arranged at both ends of the cylinder block assembly; the multiple crankcases are evenly distributed in the middle of the cylinder block assembly and are located between the front-end gearbox and the rear-end gearbox; wherein the front-end auxiliary journal and the rear-end auxiliary journal are respectively arranged at the front-end gearbox and the rear-end gearbox.

[0008] In a preferred embodiment, the cylinder block assembly further includes a front auxiliary support bracket and a rear auxiliary support bracket; the front auxiliary support bracket is arranged at the front wall of the front-end gearbox, and the front-end auxiliary journal is arranged in the front-end auxiliary main journal hole of the front auxiliary support bracket through a front-end auxiliary bearing; the rear auxiliary support bracket is arranged at the rear wall of the rear-end gearbox, and the rear-end auxiliary journal is arranged in the rear-end auxiliary main journal hole of the rear auxiliary support bracket through a rear-end auxiliary bearing.

[0009] In a preferred embodiment, the cylinder block assembly further includes multiple main bearing seats, and the multiple main bearing seats are arranged between the side walls of two rear crankcases, between the side wall of the rear crankcase and the front-end gearbox, and between the side wall of the rear crankcase and the rear-end gearbox.

[0010] In a preferred embodiment, the multiple main journals are all arranged in the main bearing holes of the multiple main bearing seats at the rear through a main bearing cover, a main bearing shell, a main bearing stud, and a main bearing nut.

[0011] In a preferred embodiment, the multiple rear crankcases of the cylinder block assembly, the front-end gearbox, and the rear-end gearbox are integrally cast.

[0012] In a preferred embodiment, the front-end auxiliary main journal hole and the rear-end auxiliary main journal hole have the same structural dimensions as the multiple main bearing holes at the rear and can be machined in one step.

[0013] In a preferred embodiment, the rear crankshaft assembly further includes a front boss and a rear boss; the front boss is arranged between the front-end auxiliary journal and the foremost rear main journal, the front boss is arranged in the front-end gearbox, and the front boss can be used to install a front gear; the rear boss is arranged between the rear-end auxiliary journal and the rearmost rear main journal, the rear boss is arranged in the rear-end gearbox, and the rear boss can be used to install a rear gear.

[0014] In a preferred embodiment, the rear crankshaft assembly further includes a front connecting shaft and a rear output shaft; the front connecting shaft is arranged at the foremost end of the rear crankshaft body, the front connecting shaft can be used to mount a shock absorber, and the front connecting shaft and the rear shock absorber are arranged outside the front gearbox; the rear output shaft is arranged at the rearmost end of the rear crankshaft body, the rear output shaft can be used to mount a flywheel, and the rear output shaft and the rear flywheel are arranged outside the rear gearbox.

[0015] Compared with the prior art, the crankshaft structure with front and rear auxiliary support files of the present invention has the following beneficial effects: This solution mainly consists of a cylinder block assembly, a crankshaft assembly, a shock absorber, a flywheel, etc. The front gearbox and the rear gearbox are added to the front and rear ends of the cylinder block respectively, and thus the front auxiliary bearing and the rear auxiliary bearing are added; the multiple crankcases of the cylinder block and the front gearbox and the rear gearbox adopt an integral casting structure, and the main bearing holes and the main shaft holes of the auxiliary support files can be machined at one time, ensuring the coaxiality and roundness of the engine bearing holes to the greatest extent, thereby improving the reliability of the crankshaft; designed in this way, the main journal of the crankshaft does not need to bear the forces and torques at the front and rear ends, and its supporting strength can be further enhanced; the front end of the crankshaft is supported by the front auxiliary bearing, the gear avoids cantilever support, the cantilever of the shock absorber is the shortest, and the torsional vibration performance of the crankshaft is improved; the rear end of the crankshaft is supported by the rear auxiliary bearing, and due to the shortening of the cantilever of the rear output shaft for installing the flywheel, the output capacity of the crankshaft is improved; the crankshaft structure of the present invention further increases the strength and stiffness of the crankshaft, the main bearing can withstand higher explosion pressures, and the front and rear auxiliary support files shorten the crankshaft cantilever, thereby achieving higher power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the front view sectional structure diagram of the crankshaft structure according to an embodiment of the present invention;

[0017] Figure 2 is the front view structure diagram of the crankshaft structure according to an embodiment of the present invention;

[0018] Figure 3 is the front view three-dimensional structure diagram of the crankshaft structure according to an embodiment of the present invention.

[0019] MAIN REFERENCE NUMERAL DESCRIPTION:

[0020] 1 - Cylinder block assembly, 5 - Flywheel, 8 - Crankshaft assembly, 9 - Damper, 10 - Main bearing cap, 11 - Main bearing shell, 12 - Main bearing stud, 13 - Main bearing nut, 14 - Crankshaft body, 15 - Main bearing seat, 16 - Front auxiliary bearing, 17 - Rear auxiliary bearing, 18 - Crankcase, 19 - Front gearbox, 20 - Rear gearbox, 21 - Balance weight bolt, 22, 23, 24, 25, 26, 27, 28 - Main journal, 29 - Front auxiliary journal, 30 - Rear auxiliary journal, 31 - Front connecting shaft, 32 - Rear output shaft, 33 - Balance weight, 34 - Front boss, 35 - Rear boss. Detailed implementation mode

[0021] The following combines the accompanying drawings to describe the detailed implementation mode of the present invention in detail, but it should be understood that the protection scope of the present invention is not limited by the detailed implementation mode.

[0022] Unless otherwise clearly stated, in the whole specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, and other elements or other components are not excluded.

[0023] As Figures 1 to 3 shown, a crankshaft structure with front and rear auxiliary support gears according to a preferred implementation mode of the present invention mainly consists of a cylinder block assembly 1, a crankshaft assembly 8, a damper 9, a flywheel 5, etc. The traditional cylinder block is only composed of multiple crankcases 18. The cylinder block assembly 1 of the present invention not only includes these basic structural features such as the main bearing seat 15, the main bearing cap 10, the main bearing shell 11, the main bearing stud 12 and the main bearing nut 13, but also adds a front gearbox 19 and a rear gearbox 20 at the front and rear ends respectively, and thus adds a front auxiliary bearing 16 and a rear auxiliary bearing 17.

[0024] Please refer to Figure 1 , in some implementation modes, it should be noted that the front gearbox 19 and the rear gearbox 20 can be cast together with the cylinder block assembly 1. Compared with the general method of adding auxiliary support gears (such as adding support gears in the gear chamber connected at the front end, or adding support gears on the flywheel housing connected at the rear end), the overall strength of the crankshaft structure of this solution is higher, and parts such as the main bearing cap 10, the main bearing shell 11, the main bearing stud 12 and the main bearing nut 13 of the engine can be made universal, that is, the same structural dimensions can be adopted for all the main bearing seats of the engine and the front and rear auxiliary support gears. In addition, since the cylinder block assembly 1 is an integral structure, the main bearing holes and the main shaft holes of the auxiliary support gears can be machined at one time, ensuring the coaxiality and roundness of the engine bearing holes to the greatest extent, thereby improving the reliability of the crankshaft.

[0025] Please refer to Figure 2, in some embodiments, the crankshaft assembly 8 mainly consists of a crankshaft body 14, a vibration damper 9, balance weights 33, balance weight bolts 21, a flywheel 5, etc. The crankshaft body 14 further includes main journals 22-28, a front auxiliary journal 29, a rear auxiliary journal 30, a front connecting shaft 31, a rear output shaft 32, a front boss 34, and a rear boss 35. Among them, the main journals 22-28 are supported by the main bearing seats 15 of the cylinder block assembly 1, while the front auxiliary journal 29 and the rear auxiliary journal 30 are supported by a front auxiliary bearing 16 and a rear auxiliary bearing 17. The vibration damper 9 can be installed at the front connecting shaft 31, and the flywheel 5 can be installed at the rear output shaft 32. Since the front and rear auxiliary support positions are added, the crankshaft system is equivalent to being divided into three regions:

[0026] 1. The middle region that bears the gas force and inertia force of the engine. This part is supported by the main bearing seats, especially the main journals 22 and 28, whose support strength is further enhanced because they do not need to bear the forces and torques at the front and rear ends.

[0027] 2. The vibration damper end region. This part is mainly supported by the front auxiliary bearing 16. At this time, the front gear can be installed on the front boss 34, and it is supported by bearings on both the front and rear sides. Therefore, the reliability is greatly enhanced compared with the original cantilever structure, and the cantilever of the front connecting shaft 31 where the vibration damper is installed can be shortened as much as possible, improving the torsional vibration performance of the crankshaft.

[0028] 3. The output end region. This part is mainly supported by the rear auxiliary bearing 17. Since the cantilever of the rear output shaft 32 where the flywheel 5 is installed is shortened, the output capacity of the crankshaft is improved.

[0029] Please refer to Figure 3 , in some embodiments, taking the in-line 6-cylinder engine as an example for the above crankshaft structure, the vibration damper 9 is arranged on the left side and the flywheel 5 is arranged on the right side. However, the structure of the present invention is applicable to engines with different numbers of cylinders and different cylinder types (in-line or V-type).

[0030] In summary, the crankshaft structure with front and rear auxiliary support gears of the present invention has the following advantages: This solution mainly consists of a cylinder block assembly, a crankshaft assembly, a damper, a flywheel, etc. The cylinder block is respectively provided with a front-end gearbox and a rear-end gearbox at the front and rear ends, and thus a front auxiliary bearing and a rear auxiliary bearing are added; multiple crankshaft boxes of the cylinder block, the front-end gearbox and the rear-end gearbox adopt an integral casting structure, and the main bearing holes and the main shaft holes of the auxiliary support gears can be machined at one time, ensuring the coaxiality and roundness of the engine bearing holes to the greatest extent, thereby improving the reliability of the crankshaft; designed in this way, the main journal of the crankshaft does not need to bear the forces and torques at the front and rear ends, and its supporting strength can be further enhanced; the front end of the crankshaft is supported by the front auxiliary bearing, the gear avoids cantilever support, the cantilever of the damper reaches the shortest, and the torsional vibration performance of the crankshaft is improved; the rear end of the crankshaft is supported by the rear auxiliary bearing, and due to the shortening of the cantilever of the rear output shaft for installing the flywheel, the output capacity of the crankshaft is improved; the crankshaft structure of the present invention further increases the strength and stiffness of the crankshaft, the main bearing can withstand higher explosion pressures, and the front and rear auxiliary support gears shorten the crankshaft cantilever, thereby achieving higher power output.

[0031] The foregoing description of specific exemplary embodiments of the invention has been presented for purposes of illustration and example. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the above teaching. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, thereby enabling those skilled in the art to implement and utilize the various different exemplary embodiments of the invention, as well as various different selections and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A crankshaft structure with front and rear auxiliary support gears, characterized in that: include: A crankshaft assembly is arranged inside the cylinder block assembly, and the crankshaft assembly includes: The crankshaft body comprises: a plurality of main journals evenly spaced and coaxially disposed in a midsection of the crankshaft body; and A front auxiliary journal and a rear auxiliary journal, which are coaxially arranged at the front and rear ends of the crankshaft body with the plurality of main journals; The cylinder block assembly comprises: A front gear box and a rear gear box, which are arranged at both ends of the cylinder block assembly; and A plurality of crankcases, which are evenly distributed and arranged in the middle of the cylinder block assembly and are located between the front end gearbox and the rear end gearbox; The front end auxiliary journal and the rear end auxiliary journal are respectively arranged at the front end gear box and the rear end gear box; The cylinder block assembly also includes: A front auxiliary support gear, which is arranged at the front wall of the front gear box, and the front auxiliary journal is arranged in the front auxiliary main shaft hole of the front auxiliary support gear through the front auxiliary bearing; and A rear auxiliary support gear, which is arranged at the rear wall of the rear end gear box, and the rear end auxiliary journal is arranged in the rear end auxiliary main shaft hole of the rear auxiliary support gear through a rear end auxiliary bearing; The cylinder block assembly further comprises a plurality of main bearing seats, which are arranged between the side walls of the two crankcases, between the crankcase and the side wall of the front gearbox, and between the crankcase and the side wall of the rear gearbox; The plurality of crankcases of the cylinder block assembly, the front end gearbox and the rear end gearbox are integrally cast; The front auxiliary spindle hole and the rear auxiliary spindle hole have the same structural dimensions as the main bearing holes of the plurality of main bearing seats and can be processed and formed in one go; wherein the front auxiliary journal and the rear auxiliary journal have the same diameter as the plurality of main journals; The crankshaft assembly also includes: A front end boss, which is arranged between the front end auxiliary journal and the frontmost main journal, the front end boss is arranged in the front end gear box, and the front end boss can be used to install the front end gear; and A rear end boss is arranged between the rear end auxiliary journal and the rearmost main journal, the rear end boss is arranged in the rear end gear box, and the rear end boss can be used to install the rear end gear.

2. The crankshaft structure with front and rear auxiliary support gears as claimed in claim 1, characterized in that: The plurality of main journals are all arranged in the main bearing holes of the plurality of main bearing seats through main bearing caps, main bearing shells, main bearing studs and main bearing nuts.

3. The crankshaft structure with front and rear auxiliary support gears as claimed in claim 1, characterized in that: The crankshaft assembly also includes: A front connecting shaft is arranged at the front end of the crankshaft body, the front connecting shaft can be used to install a vibration damper, and the front connecting shaft and the vibration damper are arranged outside the front gear box; and A rear output shaft is arranged at the rearmost end of the crankshaft body, the rear output shaft can be used to install a flywheel, and the rear output shaft and the flywheel are arranged outside the rear gear box.

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