Diesel engine crankshaft for teaching

Abstract

The invention relates to the technical field of crankshafts of diesel engines for teaching, and discloses a diesel engine crankshaft for teaching, a steel main shaft is used for being supported in an engine, the right side of the steel main shaft is connected with a crank arm group at equal intervals, the crank arm group comprises two steel crank arms, and the two steel crank arms are connected through a crank pin sleeve; the crank arm sets are connected through main journals, screw grooves are formed in the ends, away from the steel main shaft, of the crank arm sets at equal intervals, and transverse grooves are formed in the crank pin sleeve at equal intervals. The diesel engine crankshaft and part dismounting and maintenance demonstration for teaching can be completely realized on a spliced crankshaft, and compared with a shrinkage fit type crankshaft, the assembly difficulty is reduced, the assembly is simple and easy to operate, and the assembly difficulty is greatly reduced, so that the teaching demonstration in a course is facilitated, and the phenomenon that when a crank pin bush is not used, the crank pin bush cannot be damaged is avoided. And dust falls into the notch, so that the dust is prevented from influencing the assembling fluency of the crank arm group.

Description

Technical Field

[0001] The invention relates to the technical field of crankshafts of diesel engines for teaching, in particular to a crankshaft of a diesel engine for teaching. Background Art

[0002] The crankshaft is one of the core moving parts of a diesel engine. The explosive force generated by the combustion of gas in the cylinder drives the crankshaft to rotate to output torque and generate the required power. According to the number of cylinders in the diesel engine, the crankshaft is composed of a crank unit and connecting shafts at both ends. According to the assembly method of the crank unit, the crankshaft of a general diesel engine is of two types: integral forging and red sleeve type. Integral forging means that the crankshaft is forged with a whole bar, so the matrix of each crank unit is consistent and has high strength. The red sleeve type means that the main journal, crank pin and crank arm are connected by a red sleeve (hole and shaft have interference fit, hot oil is used to expand the hole during assembly, and the two are naturally locked after cooling), which also has a high bonding strength.

[0003] However, teaching diesel engines generally do not actually work. Their main purpose is to demonstrate functionality through low-speed cranking so that students can have an intuitive understanding of the movement of diesel engine moving parts, and to demonstrate the disassembly and assembly of parts so that students can master the daily maintenance of diesel engines. Therefore, the crankshaft of a teaching diesel engine has a small load. If the same structure and material are used as conventional products, the design margin is too large, and the manufacturing difficulty and cost will be too high. Therefore, a new crankshaft suitable for teaching diesel engines is designed, including parts such as a crank arm, a crank pin, a main journal, and screws. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a diesel engine crankshaft for teaching to solve the above-mentioned technical problems.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a diesel engine crankshaft for teaching, comprising:

[0008] A steel main shaft is used for supporting inside the engine. A crank arm group is connected to the right side of the steel main shaft with equal gaps. The crank arm group includes two steel crank arms, which are connected by a crank pin sleeve. The crank arm groups are connected to each other by a main shaft neck. Screw grooves are evenly spaced at one end of the crank arm group away from the steel main shaft.

[0009] The crank arm group and the main journal are connected by 8 screws evenly distributed in a full circle, and the crank arm group and the crank pin sleeve are connected by 5 screws evenly distributed in a semicircle. The material of the crank arm group, the crank pin sleeve and the main journal is Q235B, which reduces the difficulty and cost of manufacturing and assembly while ensuring the use function.

[0010] Preferably, the two steel crank arms are fixedly connected to short arms at opposite ends, the outside of the short arms are slidably connected to the inside of the crank pin sleeve, the inside of the short arms are slidably connected to a block, a curved groove is provided on the front of the block, a round rod is slidably connected to the inside of the curved groove, a long plate is connected to the front of the round rod through a seat bearing, the long plate is connected to the inside of the short arm through a hinge, the top and bottom of the block close to one end of the steel crank arm are connected to an oblique rod through a hinge, the end of the oblique rod away from the block is connected to a telescopic rod through a hinge, and the telescopic rod can be inserted into the inside of the slot, thereby realizing quick assembly between the short arm and the crank pin sleeve.

[0011] Preferably, notches are provided at equal intervals on the outside of the crank pin sleeve, and a sealing plate is slidably connected to the inside of the notch. The notch facilitates the insertion of the telescopic rod, thereby restricting the short arm inside the crank pin sleeve.

[0012] Preferably, the block is connected to the top and bottom of the short arm through a second spring, and short grooves are evenly spaced outside the block. The second spring can push the block to return to its original position after being pressed for the second time.

[0013] Preferably, the top and bottom of the short arm are fixedly connected with a slotted long block, the inside of the slotted long block is slidably connected with a slider, the slider is connected to the telescopic rod, and the slotted long block cooperates with the slider to guide the telescopic rod to make it move linearly.

[0014] Preferably, a trapezoidal block is slidably connected to the inside of the telescopic rod, and the trapezoidal block is connected to the inside of the telescopic rod by a third spring. The trapezoidal block is designed in a trapezoidal shape so that when the trapezoidal block is popped out, it can only be inserted into the crank pin sleeve and cannot be pulled back inside the crank pin sleeve.

[0015] Preferably, the crank pin sleeve has transverse grooves at equal intervals inside, the inside of the transverse grooves is slidably connected to the sealing plate, the transverse grooves and the sealing plate are connected by a first spring, the transverse grooves cooperate with the first spring to accommodate the sealing plate, and the first spring can drive the sealing plate to return to its original position after being released from squeezing by the short arm.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a diesel engine crankshaft for teaching, which has the following beneficial effects:

[0018] 1. The crankshaft of the teaching diesel engine ensures the demonstration function of the teaching diesel engine. The demonstration of low-speed cranking action and the disassembly and maintenance of parts of the teaching diesel engine can be fully realized on the spliced ​​crankshaft;

[0019] 2. The diesel engine crankshaft for teaching reduces the difficulty of manufacturing and assembling parts. Compared with the integral forged crankshaft, the spliced ​​crankshaft is less difficult to manufacture; compared with the red sleeve crankshaft, the assembly difficulty is less;

[0020] 3. The diesel engine crankshaft for teaching reduces the manufacturing and assembly costs of parts. The spliced ​​crankshaft is mainly made of Q235 steel, which has low raw material cost and is easy to cut and process; it is easy to assemble and operate;

[0021] 4. The crankshaft of the diesel engine used for teaching can be driven by pressing back and forth through the added short arm, so that the crank arm group can be quickly disassembled and installed, which greatly reduces the difficulty of assembly, thus facilitating teaching demonstrations in the tutorial;

[0022] 5. The teaching diesel engine crankshaft has an additional sealing plate, which automatically releases the sealing of the slot when the short arm is inserted into the crank pin sleeve to assemble the crank arm group, so as to prevent dust from falling into the slot when the crank pin sleeve is not in use, thereby preventing the dust from affecting the smoothness of the crank arm group assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front schematic diagram of the present invention;

[0024] Figure 2 It is a partial enlarged view of the crank arm assembly of the present invention;

[0025] Figure 3 It is an internal cross-sectional view of the short arm of the present invention;

[0026] Figure 4 This is an internal cross-sectional view of the telescopic rod of the present invention;

[0027] Figure 5 It is an internal cross-sectional view of the crank pin sleeve of the present invention;

[0028] Figure 6 This is a partial enlarged view of the sealing plate of the present invention.

[0029] In the figure: 1, steel main shaft; 2, crank arm assembly; 21, steel crank arm; 3, crank pin sleeve; 31, notch; 32, closing plate; 321, first spring; 33, transverse groove; 4, main shaft neck; 5, short arm; 51, square block; 501, short groove; 511, second spring; 52, curved groove; 53, round rod; 54, long plate; 55, oblique rod; 56, telescopic rod; 561, third spring; 562, trapezoidal block; 563, slider; 564, slotted long block; 6, screw groove. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a technical solution, a diesel engine crankshaft for teaching, comprising:

[0032] See also Figure 1 and Figure 2 The steel main shaft 1 is used to support the inside of the engine. A crank arm group 2 is connected to the right side of the steel main shaft 1 with equal gaps. The crank arm group 2 includes two steel crank arms 21. The two steel crank arms 21 are connected by a crank pin sleeve 3. The crank arm groups 2 are connected to each other by a main shaft journal 4. Screw grooves 6 are evenly spaced at one end of the crank arm group 2 away from the steel main shaft 1.

[0033] See also Figure 1 and Figure 2 The crank arm group 2 and the main journal 4 are connected by 8 screws evenly distributed in a full circle, and the crank arm group 2 and the crank pin sleeve 3 are connected by 5 screws evenly distributed in a semicircle. The material of the crank arm group 2, the crank pin sleeve 3 and the main journal 4 is Q235B, which reduces the difficulty and cost of manufacturing and assembly while ensuring the use function.

[0034] See also Figure 3 and Figure 4 The opposite ends of the two steel crank arms 21 are fixedly connected with short arms 5, the outside of the short arms 5 is slidably connected to the inside of the crank pin sleeve 3, the inside of the short arm 5 is slidably connected with a block 51, the block 51 can slide inside the short arm 5, the block 51 is connected to the top and bottom of the inside of the short arm 5 through a second spring 511, and short grooves 501 are evenly spaced outside the block 51.

[0035] See also Figure 3 and Figure 4 The second spring 511 can push the block 51 to return to its original position after being pressed for the second time. A curved groove 52 is provided on the front of the block 51. The curved groove 52 cooperates with the round rod 53 to form an automatic buckle principle. The inside of the curved groove 52 is slidably connected to the round rod 53. The front of the round rod 53 is connected to a long plate 54 through a seat bearing, and the long plate 54 can be connected to the round rod 53.

[0036] See also Figure 3 and Figure 4The long plate 54 is connected to the inside of the short arm 5 by a hinge, and the top and bottom of the block 51 near the steel crank arm 21 are both connected to the inclined rod 55 by a hinge. The inclined rod 55 can transmit the telescopic rod 56, and the end of the inclined rod 55 away from the block 51 is connected to the telescopic rod 56 by a hinge. The telescopic rod 56 can be telescopic, and the inside of the telescopic rod 56 is slidably connected with a trapezoidal block 562, and the trapezoidal block 562 is connected to the inside of the telescopic rod 56 by a third spring 561. The trapezoidal block 562 is designed to be trapezoidal, so that when the trapezoidal block 562 is popped out, it can only be inserted into the crank pin sleeve 3 and cannot be pulled back inside the crank pin sleeve 3.

[0037] See also Figure 3 and Figure 4 The telescopic rod 56 can be inserted into the slot 31, so as to realize the quick assembly between the short arm 5 and the crank pin sleeve 3. The top and the bottom of the short arm 5 are fixedly connected with the slotted long block 564. The inside of the slotted long block 564 is slidably connected with the slider 563. The slider 563 is connected to the telescopic rod 56. The slotted long block 564 cooperates with the slider 563 to guide the telescopic rod 56 to make it move linearly.

[0038] See also Figure 5 and Figure 6 The crank pin sleeve 3 is provided with slots 31 at equal intervals on the outside, and the slots 31 can limit the telescopic rod 56. The slots 31 are slidably connected to the inside of the slots 31 with a sealing plate 32, and the sealing plate 32 can close the slots 31 to prevent dust from entering the inside of the crank pin sleeve 3. The slots 31 facilitate the insertion of the telescopic rod 56, thereby limiting the short arm 5 inside the crank pin sleeve 3. The crank pin sleeve 3 is provided with transverse grooves 33 at equal intervals on the inside, and the inside of the transverse grooves 33 is slidably connected to the sealing plate 32. The transverse grooves 33 and the sealing plate 32 are connected by a first spring 321. The transverse grooves 33 cooperate with the first spring 321 to accommodate the sealing plate 32. The first spring 321 can drive the sealing plate 32 to return to its original position after being released from the squeezing of the short arm 5.

[0039] This solution requires that when assembling the diesel engine crankshaft, the short arm 5 is inserted into the crank pin sleeve 3. When the short arm 5 is inserted into the crank pin sleeve 3, the block 51 inside the short arm 5 contacts the inside of the crank pin sleeve 3 and performs retraction transmission. When the block 51 retracts, it drives the round rod 53 to slide inside the curved groove 52. The sliding round rod 53 is restricted in the recessed part at the top of the curved groove 52. At this time, the position of the block 51 is fixed. At the same time, when the block 51 moves, it drives the inclined rod 55 to drive the telescopic rod 56 to move. The two telescopic rods 56 move away from each other. After the telescopic rod 56 protrudes through the short groove 501, it is inserted into the notch 31 inside the crank pin sleeve 3, thereby fixing the short arm 5 inside the crank pin sleeve 3.

[0040] When disassembly is required, the short arm 5 is pushed into the crank pin sleeve 3 again. When the block 51 is squeezed and retracted again, the round rod 53 is driven to slide in the curved groove 52 again. At this time, the round rod 53 will be pushed by the groove inside the curved groove 52, and slide out and return from the other end of the curved groove 52, thereby releasing the fixation of the block 51. The block 51 is returned by the second spring 511, and the returned block 51 drives the telescopic rod 56 to return. After the telescopic rod 56 returns, the fixation of the short arm 5 and the crank pin sleeve 3 is released, so that the crank arm group 2 can be disassembled. Through the added short arm 5, the crank arm group 2 can be quickly disassembled and installed by pressing back and forth, which greatly reduces the difficulty of assembly, thereby facilitating teaching demonstrations in tutorials.

[0041] At the same time, when the short arm 5 is inserted into the crank pin sleeve 3, it will drive the sealing plate 32 to slide inside the crank pin sleeve 3, so that the sealing plate 32 releases the sealing of the slot 31. Through the added sealing plate 32, when the short arm 5 is inserted into the crank pin sleeve 3 to assemble the crank arm group 2, the slot 31 is automatically released, thereby preventing dust from falling into the slot 31 when the crank pin sleeve 3 is not in use, thereby preventing dust from affecting the smoothness of the crank arm group 2 during assembly.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A diesel engine crankshaft for teaching, characterized in that: include: A steel main shaft (1) is used for supporting inside an engine. A crank arm group (2) is connected to the right side of the steel main shaft (1) at equal intervals. The crank arm group (2) includes two steel crank arms (21). The two steel crank arms (21) are connected to each other via a crank pin sleeve (3). The crank arm groups (2) are connected to each other via a main shaft journal (4). Screw grooves (6) are evenly spaced at one end of the crank arm group (2) away from the steel main shaft (1). The crank arm assembly (2) and the main journal (4) are connected by eight screws evenly distributed in a full circle, and the crank arm assembly (2) and the crank pin sleeve (3) are connected by five screws evenly distributed in a semicircle. The material of the crank arm assembly (2), the crank pin sleeve (3) and the main journal (4) is Q235B.

2. A diesel engine crankshaft for teaching use according to claim 1, characterized in that: The opposite ends of the two steel crank arms (21) are fixedly connected with short arms (5), the outside of the short arms (5) is slidably connected to the inside of the crank pin sleeve (3), the inside of the short arms (5) is slidably connected to a block (51), the front of the block (51) is provided with a curved groove (52), the inside of the curved groove (52) is slidably connected to a round rod (53), the front of the round rod (53) is connected to a long plate (54) through a seat bearing, the long plate (54) is connected to the inside of the short arms (5) through a hinge, the top and bottom of the block (51) close to one end of the steel crank arm (21) are both connected to an inclined rod (55) through a hinge, and the end of the inclined rod (55) away from the block (51) is connected to a telescopic rod (56) through a hinge.

3. The diesel engine crankshaft for teaching use according to claim 1, characterized in that: The crank pin sleeve (3) is provided with slots (31) at equal intervals on the outside, and a sealing plate (32) is slidably connected to the inside of the slot (31).

4. A diesel engine crankshaft for teaching use according to claim 2, characterized in that: The top and bottom of the block (51) and the short arm (5) are connected via a second spring (511), and short slots (501) are arranged at equal intervals on the outside of the block (51).

5. The diesel engine crankshaft for teaching use according to claim 2, characterized in that: The top and bottom of the short arm (5) are fixedly connected with a slotted long block (564), the inside of the slotted long block (564) is slidably connected with a slider (563), and the slider (563) is connected to the telescopic rod (56).

6. The diesel engine crankshaft for teaching use according to claim 2, characterized in that: The interior of the telescopic rod (56) is slidably connected with a trapezoidal block (562), and the trapezoidal block (562) is connected to the interior of the telescopic rod (56) via a third spring (561).

7. The diesel engine crankshaft for teaching use according to claim 3, characterized in that: The crank pin sleeve (3) is provided with transverse grooves (33) at equal intervals inside, the interior of the transverse groove (33) is slidably connected to the sealing plate (32), and the transverse groove (33) and the sealing plate (32) are connected via a first spring (321).

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