Gear box integrated on diesel engine

Abstract

The utility model discloses a gearbox integrated on a diesel engine, which belongs to the technical field of diesel engines and is integrally arranged at the free end of the diesel engine, the upper portion of the axial end face of the gearbox far away from the diesel engine is closed, and the lower portion of the axial end face is provided with an opening which is provided with a flat-plate-shaped cover plate. A crankshaft gear, an intermediate gear, a duplicate gear, a camshaft gear, an oil pump gear and a fuel pump gear which are meshed with one another are mounted in the gearbox, the gearbox in the design is of a half-shielding structure, the rigidity of the gearbox can be guaranteed, more functions are convenient to arrange, the gears and related parts are convenient to assemble, the cover plate is convenient to machine, materials are saved, and the cost is reduced. The assembly manufacturability and the machining manufacturability are both considered, the appearance and the structure of the diesel engine are optimized, and the working reliability of all systems is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of diesel engines, and in particular relates to a gear box integrated on a diesel engine. Background Art

[0002] At present, medium-speed diesel engines generally use gear transmission. The crankshaft output power is transmitted to the camshaft, oil pump, fuel pump, water pump, etc. through gear transmission. Some diesel engine gears are arranged at the free end, some are arranged at the flywheel end, and some are arranged at both ends. It is usually composed of crankshaft gears, intermediate gears, duplex gears, camshaft gears, and pump gears.

[0003] If there are gears, a matching gear box needs to be designed. Some designs and install gear brackets on the end face of the machine body, and then add end covers on the outside. Some make the gear box independent of the machine body, and tighten the gear box to the machine body with bolts during assembly. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a gear box integrated on a diesel engine, which has good rigidity, saves materials, is easy to process, and is convenient for arranging more functions, while taking into account assembly processability and processing processability.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A gearbox integrated in a diesel engine, the gearbox is integrally arranged at the free end of the diesel engine, the upper part of the axial end surface of the gearbox away from the diesel engine is closed, and the lower part is provided with an opening, a flat cover plate is provided at the opening, and meshing crankshaft gears, intermediate gears, duplex gears, camshaft gears, oil pump gears and fuel pump gears are installed in the gearbox.

[0007] Furthermore, the double gears include a coaxially arranged double small gear and a double large gear, the inner wall of the gear box is connected to a gear mounting inner seat, and the outer wall is connected to a gear mounting outer seat opposite to the gear mounting inner seat, one end of the pin shaft passes through the gear mounting outer seat, the central axis hole of the double gear and the gear mounting inner seat in sequence, and the pin shaft is fixed to the outer wall of the gear box through a pin shaft holder.

[0008] Furthermore, the gap between the gear mounting inner seat and the gear mounting outer seat is processed into a gear thrust surface, and the gear thrust surface is a step surface, and the axially longer end surface of the gear thrust surface is pressed against the end surface of the duplex gear.

[0009] Furthermore, a lubricating oil passage is arranged in the gear box, and an oil inlet connected to the lubricating oil passage is opened on the top surface of the gear box. The lubricating oil passage includes a vertically arranged main oil passage and a horizontally arranged through oil passage. The lubricating oil passage also includes a vertically arranged crankshaft gear oil intake hole, one end of the crankshaft gear oil intake hole is connected to the through oil passage, and the other end is connected to the main bearing hole.

[0010] Furthermore, the lubricating oil passage also includes a vertically arranged camshaft oil intake hole, one end of which is connected to the through oil passage and the other end is connected to the camshaft center oil passage, and the camshaft center oil passage is connected to the cylinder head through an oil drain hole.

[0011] Furthermore, a hollow intermediate gear mounting seat is formed above the main bearing hole, an oil chamber is formed at the center of the intermediate gear mounting seat, the through oil passage is connected to the oil chamber through the intermediate gear oil extraction hole, and an axial central oil passage is formed on the gear shaft, one end of the central oil passage is connected to the oil chamber, and the other end is connected to the bearing between the mounting flange and the gear shaft.

[0012] Furthermore, a pin shaft hole is provided at the center of the gear mounting inner seat, and the pin shaft hole and the camshaft oil intake hole are of a through-penetration structure. The pin shaft is provided with oil passages in the axial and radial directions connecting the pin shaft hole and the bearings between the double gear and the pin shaft.

[0013] Furthermore, the lubricating oil channel also includes a transversely arranged tooth surface lubricating oil channel connected to the camshaft oil intake hole, one end of the tooth surface lubricating oil channel is connected to the oil spray nozzle through the tooth surface lubricating oil intake hole, and the oil spray nozzle is arranged above the meshing position of the intermediate gear and the double gear.

[0014] Furthermore, an oil drain valve is installed on the upper part of the side wall of the gear box close to the oil inlet, and the oil drain valve includes a pressure relief port and an oil return port which are not connected to the main oil channel at the same time.

[0015] Furthermore, an oil filter is installed at the oil inlet, the camshaft gear mounting seat is provided at the upper part of the gear box, and the end face of the gear box located above the camshaft gear mounting seat is provided with an oil-gas separator mounting hole which can serve as the camshaft gear lifting process hole, and the side wall of the gear box is also provided with a transmission case mounting hole and an oil suction port for fixing the oil pump suction pipe.

[0016] After adopting the above technical solution, the beneficial effects of the utility model are:

[0017] Since the gear box integrated on the diesel engine of the utility model is integrally arranged at the free end of the diesel engine, the upper part of the axial end surface of the gear box away from the diesel engine is closed, and the lower part is provided with an opening, and a flat cover plate is provided at the opening. The gear box is installed with meshing crankshaft gears, intermediate gears, duplex gears, camshaft gears, oil pump gears and fuel pump gears. The gear box is a semi-covered structure, which can ensure the rigidity of the gear box, facilitate the layout of more functions, and facilitate the assembly of gears and related components. The cover plate is easy to process, saves materials, takes into account assembly processability and processing processability, optimizes the appearance and structure of the diesel engine, and increases the working reliability of each system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1a , Figure 1b It is a schematic diagram of the structure of the gearbox integrated on the diesel engine of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the gear box cover;

[0020] Figure 3 It is a schematic diagram of the gear arrangement in the gearbox;

[0021] Figure 4a , Figure 4b It is a schematic diagram of the distribution of lubricating oil channels in the gearbox;

[0022] Figure 5 yes Figure 3 Sectional view along line AA;

[0023] Figure 6 yes Figure 5 A magnified schematic diagram of the middle A1 section;

[0024] Figure 7 It is a schematic diagram of the structure of the thrust surface of the gear;

[0025] Figure 8 yes Figure 3 Sectional view along line BB;

[0026] Fig. 9 yes Figure 3 Sectional view along line CC;

[0027] Fig.10 It is the assembly diagram of the camshaft gear;

[0028] In the figure, 1-diesel engine, 2-gearbox, 201-inner wall, 202-outer wall, 203-opening, 204-cover plate, 3-crankshaft gear, 301-main bearing hole, 4-intermediate gear, 401-gear shaft, 402-boss, 403-mounting flange, 410-intermediate gear mounting seat, 5-double gear, 501-double small gear, 502-double large gear, 510-double gear seat, 511-gear mounting inner seat, 512-gear mounting outer seat, 513-gear thrust surface, 520-pin shaft hole, 521-pin shaft, 522-pin shaft seat, 6-camshaft gear, 601-cam Shaft gear mounting seat, 7-transmission housing, 701-oil pump gear, 702-fuel pump gear, 703-transmission housing mounting hole, 801-oil inlet, 802-main oil channel, 803-through oil channel, 804-pressure relief port, 805-oil return port, 810-crankshaft gear oil extraction hole, 820-camshaft oil extraction hole, 821-camshaft center oil channel, 822-oil drain hole, 830-tooth surface lubrication oil channel, 831-tooth surface lubrication oil extraction hole, 832-injection nozzle, 840-intermediate gear oil extraction hole, 841-oil chamber, 901-oil suction port, 902-oil-gas separator mounting hole, 10-shock absorber. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0030] In the description of this specification, unless otherwise clearly defined, words such as "setting", "installation", and "connection" should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above words in this utility model based on the specific content of the technical solution.

[0031] like Figure 1a , Figure 1b and Figure 2As shown together, a gearbox integrated in a diesel engine, the gearbox 2 is integrally arranged at the free end of the diesel engine 1, and the gearbox 2 is integrated in the engine body, has good rigidity and saves materials. The upper part of the axial end surface of the gearbox 2 away from the diesel engine 1 is closed, and the lower part is provided with an opening 203, which is a semi-covered structure, which ensures the rigidity of the gearbox 2 while facilitating the layout of more functions, such as arranging lubricating oil channels, oil suction ports 901, fuel injection nozzles 832, etc. in the gearbox 2, and the design of the opening 203 is more convenient for assembling gears. A flat cover plate 204 is provided at the opening 203 at the front end to cover the opening 203. Compared with the conventional convex cover plate, the cover plate 204 of this embodiment is easy to process, saves materials, and optimizes the appearance of the whole machine. A shock absorber 10 is also provided in the gearbox 2 to reduce the vibration of the gearbox 2.

[0032] like Figure 3 As shown, the gearbox 2 is equipped with meshing crankshaft gear 3, intermediate gear 4, duplex gear 5, camshaft gear 6, oil pump gear 701 and fuel pump gear 702. The axial end face of the gearbox 2 is set to be the inner wall 201 on the side close to the diesel engine 1, and the side away from the diesel engine 1 is the outer wall 202, and the opening 203 is located at the lower part of the outer wall 202. The crankshaft gear 3 is installed at one end of the crankshaft of the diesel engine 1 passing through the inner wall 201, the intermediate gear 4 is meshed with the crankshaft gear 3 and the duplex gear 5, and the duplex gear 5 is meshed with the camshaft gear 6, the oil pump gear 701 and the fuel pump gear 702. The crankshaft gear 3 transmits torque to the camshaft gear 6, the oil pump gear 701 and the fuel pump gear 702 through the intermediate gear 4 and the duplex gear 5, driving the camshaft, the oil pump and the fuel pump to rotate.

[0033] like Figure 1a , Figure 3 and Figure 8 As shown together, the outer wall 202 is provided with a main bearing hole 301, and the crankshaft passes through the main bearing hole 301 and is connected to the crankshaft gear 3. A hollow intermediate gear mounting seat 410 is formed above the main bearing hole 301 near the exhaust side, and the intermediate gear 4 is fixed to the intermediate gear mounting seat 410 through a gear shaft 401 with a mounting flange 403. Bolts are fixed to the intermediate gear mounting seat 410 after passing through the through holes of the mounting flange 403. The boss 402 on the gear shaft 401 cooperates with the structure of the intermediate gear mounting seat 410 to achieve positioning of the intermediate gear 4.

[0034] like Figure 1b and Figure 3As shown in the figure, the gear box 2 is provided with a double gear seat 510 for mounting the double gear 5, and the double gear 5 is fixed in the double gear seat 510 through an axle pin holder. The double gear 5 specifically includes a coaxially arranged double pinion 501 and a double large gear 502, the double large gear 502 meshes with the oil pump gear 701, and the double pinion 501 meshes with the camshaft gear 6 and the fuel pump gear 702 to achieve power transmission.

[0035] like Figure 5 As shown, the double gear 5 is two gears connected in series, and the overall thickness is twice that of the middle gear 4. Therefore, in order to prevent the middle gear 4 from being too long after installation and the gear box 2 from being too thick, the double gear seat 510 and the gear shaft 401 are designed as a pin structure. Specifically, the double gear seat 510 includes a gear mounting inner seat 511 connected to the inner wall 201 of the gear box 2 and a gear mounting inner seat 512 connected to the outer wall 202 of the gear box 2, and the gear mounting inner seat 511 is arranged opposite to the gear mounting outer seat 512.

[0036] During assembly, one end of the pin 521 passes through the gear mounting outer seat 512, the central axis hole of the double gear 5 and the gear mounting inner seat 511 in sequence to position the double gear 5, and the pin 521 is fixed to the outer wall 202 of the gear box 2 through the pin holder 522. This mounting structure can save space, provide double support for the double gear 5, and improve the reliability of the double gear 5.

[0037] like Figure 5 , Figure 6 and Figure 7 As shown in common, the gap between the gear mounting inner seat 511 and the gear mounting outer seat 512 is processed into a gear thrust surface 513, and the gear thrust surface 513 is a step surface. The axially longer end face of the gear thrust surface 513 is pressed against the end face of the duplex gear 5, that is, the end faces of the gear mounting inner seat 511 and the gear mounting outer seat 512 in contact with the duplex gear 5 are both set as step surfaces, and only the accuracy of the thrust gap needs to be controlled, and the accuracy requirement of the surface under the step that does not contact the gear is relatively low, thereby achieving thrust while avoiding the need for fine machining of large surfaces, reducing the difficulty of machining, and having better processability.

[0038] like Figure 4a and Figure 4bAs shown in common, a lubricating oil passage is provided in the gearbox 2, which is used to lubricate the bearings, gear surfaces and camshafts of each gear, thereby extending the service life. The oil passage is concentrated in the gearbox 2 for distribution, and there is no need to use pipelines to guide the oil, which reduces the number of pipelines and improves reliability. An oil inlet 801 connected to the lubricating oil passage is provided on the top surface of the gearbox 2. The lubricating oil passage specifically includes a main oil passage 802 arranged vertically and a through oil passage 803 arranged horizontally. An oil filter is installed at the oil inlet 801 on the top surface of the gearbox 2. After being filtered by the oil filter, the oil enters the main oil passage 802 from the oil inlet 801, and then is distributed to the bearings of each gear through multiple channels connected to the through oil passage 803.

[0039] The lubricating oil passage also includes a vertically arranged crankshaft gear oil intake hole 810, one end of which is connected to the through oil passage 803 and the other end is connected to the main bearing hole 301, so as to supply oil and lubricate the bearing installed at the main bearing hole 301 of the crankshaft. The lubricating oil passage also includes a vertically arranged camshaft oil intake hole 820, one end of which is connected to the through oil passage 803 and the other end is connected to the camshaft center oil passage 821. The oil in the camshaft oil intake hole 820 enters the camshaft center oil passage 821 through the radial oil passage of the first gear of the camshaft, and then is distributed to each gear of the camshaft through the radial oil passages of the remaining gears of the camshaft, so as to achieve lubrication of the camshaft. The camshaft center oil passage 821 is connected to the cylinder head through the oil drain hole 822, so as to supply the engine oil to other positions of the diesel engine 1 for lubrication.

[0040] like Figure 8 As shown, the center of the intermediate gear mounting seat 410 forms an oil cavity 841, which is a casting cavity, which can achieve weight reduction and reduce processing volume. The edge of the oil cavity 841 near the intermediate gear 4 is processed into a stopper, which cooperates with the boss 402 on the gear shaft 401 to achieve the positioning of the intermediate gear 4. Figure 4a As shown, an intermediate gear oil intake hole 840 is provided on the through oil passage 803, and the through oil passage 803 is connected with the oil chamber 841 through the intermediate gear oil intake hole 840. The gear shaft 401 is provided with an axial central oil passage, one end of the central oil passage is connected with the oil chamber 841, and the other end is connected with the bearing between the mounting flange 403 and the gear shaft 401. The oil in the through oil passage 803 is transported to the bearing through the intermediate gear oil intake hole 840, the oil chamber 841 and the central oil passage of the gear shaft 401 to achieve the purpose of lubrication.

[0041] like Figure 5As shown, a pin hole 520 is provided at the center of the gear mounting inner seat 511, and a pin 521 for fixing the double gear 5 is inserted into the pin hole 520. The pin hole 520 and the camshaft oil extraction hole 820 are of a through-penetration structure, that is, the pin hole 520 is connected with the camshaft oil extraction hole 820, and the pin 521 is provided with an oil passage connecting the pin hole 520 and the bearing between the double gear 5 and the pin 521 in the axial and radial directions. Therefore, the oil in the camshaft oil extraction hole 820 is transported to the bearing through the pin hole 520, the pin 521, and the oil passage of the pin 521 to achieve the purpose of lubrication.

[0042] like Figure 4a and Fig. 9 As shown in common, the lubricating oil passage also includes a transversely arranged tooth surface lubricating oil passage 830 connected to the camshaft oil intake hole 820. One end of the tooth surface lubricating oil passage 830 is connected to the oil spray nozzle 832 through the tooth surface lubricating oil intake hole 831. The oil spray nozzle 832 is arranged above the meshing position of the intermediate gear 4 and the double gear 5. The oil spray nozzle 832 sprays mist oil to lubricate the tooth surface of each gear.

[0043] like Figure 2 and Figure 4a As shown in the figure, an oil drain valve is installed on the upper part of the side wall of the gearbox 2 near the oil inlet 801, and the oil drain valve includes a pressure relief port 804 and an oil return port 805 which are not connected to the main oil channel 802 at the same time. Specifically, when the oil pressure in the lubricating oil channel is too high, the oil drain valve opens, and the excess oil is discharged through the pressure relief port 804; when the oil pressure in the lubricating oil channel is too low, the oil drain valve opens, and the oil enters the lubricating oil channel through the oil return port 805 for replenishment.

[0044] As shown in Figure 1 and Fig.10 As shown together, a camshaft gear mounting seat 601 is provided on the upper part of the gearbox 2, and an oil-gas separator mounting hole 902 is provided on the end surface of the gearbox 2 above the camshaft gear mounting seat 601, where an oil-gas separator can be installed, which is connected to the crankcase of the diesel engine 1 through a pipeline to remove gas from the fuel. During the gear assembly process, the oil-gas separator mounting hole 902 can be used as a hoisting process hole for the camshaft gear 6, which facilitates the installation of the camshaft gear 6.

[0045] As shown in FIG1 , a transmission housing mounting hole 703 is also provided on the side wall of the gearbox 2 opposite to the oil drain valve, the transmission shafts of the oil pump and the fuel pump are located in the transmission housing 7, the oil pump gear 701 and the fuel pump gear 702 are located on the corresponding transmission shafts, and the transmission housing 7 is mounted on the gearbox 2 through the transmission housing mounting hole 703. An oil suction port 901 is also provided on the side wall of the gearbox 2, which can fix the oil suction pipe of the oil pump to prevent the oil suction pipe from moving when the oil pump sucks oil from the oil pan.

[0046] In the above description of the present application, all processing of the gear box 2 is horizontal or vertical, avoiding the processing of inclined holes, and does not require special inclined tooling for processing inclined holes, thereby reducing the complexity of processing.

[0047] The gearbox integrated on the diesel engine of the utility model is arranged as a semi-covered structure, and a flat cover is arranged at the lower opening, which can facilitate the layout of lubrication oil channels and the assembly of components such as oil filters and oil-gas separators while ensuring the rigidity of the gearbox, facilitate processing, save materials, take into account assembly processability and processing processability, optimize the appearance and structure of the diesel engine, and increase the working reliability of each system.

[0048] Although the specific implementation methods of the utility model are described above, those skilled in the art should understand that the described embodiments are only part of the implementation methods of the utility model, rather than all the implementation methods, which are only examples, and the protection scope of the utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these implementation methods without departing from the principle and essence of the utility model and without any creative work, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A gearbox integrated in a diesel engine, characterized in that: The gearbox is integrally arranged at the free end of the diesel engine. The upper part of the axial end surface of the gearbox away from the diesel engine is closed, and the lower part is provided with an opening. A flat cover plate is provided at the opening. The gearbox is equipped with meshing crankshaft gears, intermediate gears, duplex gears, camshaft gears, oil pump gears and fuel pump gears.

2. The gearbox integrated on the diesel engine according to claim 1, characterized in that: The duplex gears include a coaxially arranged duplex small gear and a duplex large gear. The inner wall of the gear box is connected to a gear mounting inner seat, and the outer wall is connected to a gear mounting outer seat opposite to the gear mounting inner seat. One end of the pin shaft passes through the gear mounting outer seat, the central axis hole of the duplex gear and the gear mounting inner seat in sequence, and the pin shaft is fixed to the outer wall of the gear box through a pin shaft clamp.

3. The gearbox integrated on the diesel engine according to claim 2, characterized in that: The gap between the gear mounting inner seat and the gear mounting outer seat is processed into a gear thrust surface, and the gear thrust surface is a step surface. The axially longer end surface of the gear thrust surface is pressed tightly against the end surface of the duplex gear.

4. The gearbox integrated on the diesel engine according to claim 2, characterized in that: A lubricating oil passage is arranged in the gear box, and an oil inlet connected to the lubricating oil passage is opened on the top surface of the gear box. The lubricating oil passage includes a vertically arranged main oil passage and a horizontally arranged through oil passage. The lubricating oil passage also includes a vertically arranged crankshaft gear oil intake hole, one end of the crankshaft gear oil intake hole is connected to the through oil passage, and the other end is connected to the main bearing hole.

5. The gearbox integrated on the diesel engine according to claim 4, characterized in that: The lubricating oil passage also includes a vertically arranged camshaft oil intake hole, one end of which is connected to the through oil passage and the other end is connected to the camshaft central oil passage, and the camshaft central oil passage is connected to the cylinder head through the oil drain hole.

6. The gearbox integrated on the diesel engine according to claim 4, characterized in that: An intermediate gear mounting seat with a hollow structure is formed above the main bearing hole, an oil chamber is formed in the center of the intermediate gear mounting seat, the through oil passage is connected with the oil chamber through the intermediate gear oil extraction hole, an axial central oil passage is formed on the gear shaft, one end of the central oil passage is connected with the oil chamber, and the other end is connected with the bearing between the mounting flange and the gear shaft.

7. The gearbox integrated on the diesel engine according to claim 5, characterized in that: A pin hole is arranged at the center of the gear mounting inner seat, and the pin hole and the camshaft oil extraction hole are of a through-penetration structure. The pin is provided with oil passages in the axial and radial directions to connect the pin hole and the bearings between the duplex gear and the pin.

8. The gearbox integrated on the diesel engine according to claim 5, characterized in that: The lubricating oil passage also includes a transversely arranged tooth surface lubricating oil passage connected to the camshaft oil intake hole, one end of the tooth surface lubricating oil passage is connected to the oil spray nozzle through the tooth surface lubricating oil intake hole, and the oil spray nozzle is arranged above the meshing position of the intermediate gear and the double gear.

9. The gearbox integrated on the diesel engine according to claim 4, characterized in that: An oil drain valve is installed at the upper part of the gear box near the oil inlet, and the oil drain valve includes a pressure relief port and an oil return port which are not connected to the main oil channel at the same time.

10. The gearbox integrated on a diesel engine according to any one of claims 4 to 9, characterized in that: An oil filter is installed at the oil inlet, a camshaft gear mounting seat is provided on the upper part of the gear box, an oil-gas separator mounting hole which can be used as the camshaft gear lifting process hole is provided on the end face of the gear box above the camshaft gear mounting seat, and the side wall of the gear box is also provided with a transmission case mounting hole and an oil suction port for fixing the oil pump suction pipe.

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