CN111750068A

CN111750068A - Idle gear component of V-shaped diesel engine

Info

Publication number: CN111750068A
Application number: CN202010758833.XA
Authority: CN
Inventors: 陈悦; 黄永仲; 覃明智; 胡忠义
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Marine and Genset Power Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2020-10-09

Abstract

The invention discloses an idler gear component of a V-shaped diesel engine, relates to a V-shaped high-speed diesel engine, and solves the technical problem that a large idler gear and a small idler gear are difficult to meet the requirement of transmitting larger torque by adopting the traditional interference fit connection. The large idler gear is sleeved in the mounting part and fixedly connected with the mounting part through a fastening bolt; the small idle gear is rotatably arranged on an idle gear shaft through a first bushing, and the mounting part is rotatably arranged on the idle gear shaft through a second bushing; an oil inlet hole extending towards the interior of the idle gear shaft is formed in the end face of one end, far away from the mounting part, of the idle gear shaft; the side wall of the idler gear shaft below the two bushings is provided with an oil outlet, and the oil outlet is communicated with the oil inlet. The large idler gear and the small idler gear are connected safely and reliably, the safety coefficient is high, and the requirement of transmitting larger torque can be met; and can provide adequate support and lubrication for the idler gear.

Description

Idle gear component of V-shaped diesel engine

Technical Field

The present invention relates to V-type high speed diesel engines, and more particularly, it relates to V-type diesel engine idler gear assemblies.

Background

The idle gear assembly is a transmission device of parts such as a driving camshaft of an engine, an oil pump, a water pump and the like, and is one of key parts for ensuring the normal operation of the engine. The idler gear is typically driven by a crankshaft timing gear, transferring power to camshaft gears, oil pump gears, and other accessory gears.

For a V-shaped high-speed diesel engine, due to the limitation of space, an idler gear assembly is generally designed into a two-layer speed reducing structure (the rotating speed of a camshaft must be half of the rotating speed of a crankshaft), and a large idler gear and a small idler gear are connected in an interference fit mode to ensure that the large idler gear and the small idler gear cannot rotate relatively. As the power density and speed of the engine increase, the driving power of the valve train and the high pressure oil pump also increases greatly, which means that the idler gear assembly needs to transmit a larger torque. Due to the limitation of the gear design (mainly the thickness of the containing piece and the contained piece), the interference magnitude cannot be designed to be too large; the interference fit has higher requirement on the tolerance of the size, and the fitting degree between the large idler gear and the small idler gear is difficult to ensure. For an already assembled idler gear assembly, engine manufacturers cannot detect interference unless destructive testing is performed. Therefore, the large idler gear and the small idler gear are connected by the traditional interference fit, and the requirement of transmitting larger torque is difficult to meet. In addition, because it is a moving member that rotates at high speed, lubrication and cooling of the idler gear shaft require significant attention.

Disclosure of Invention

The invention aims to solve the technical problem that aiming at the defects of the prior art, the invention provides the idler gear component of the V-shaped diesel engine, and solves the problem that the large idler gear and the small idler gear are connected in an interference fit mode and are difficult to meet the requirement of transmitting larger torque.

The technical scheme of the invention is as follows: the V-shaped diesel engine idle gear assembly comprises an idle gear shaft, a small idle gear and a large idle gear, wherein one end of the small idle gear is provided with an installation part which is of an integrated structure with the small idle gear, and the large idle gear is sleeved in the installation part and is fixedly connected with the installation part through a fastening bolt; the small idle gear is rotatably installed on an idle gear shaft through a first bushing, and the installation part is rotatably installed on the idle gear shaft through a second bushing; an oil inlet hole extending towards the interior of the idle gear shaft is formed in the end face of one end, far away from the mounting part, of the idle gear shaft; and the side wall of the idle gear shaft below the first bushing and the second bushing is provided with an oil outlet, and the oil outlet is communicated with the oil inlet.

The end part of the mounting part is provided with a positioning disc with the diameter larger than that of the small idle gear, and the large idle gear is sleeved in the positioning disc; the side wall of the positioning disc is provided with a connecting flange, the large idle gear is provided with mounting holes which correspond to the flange holes of the connecting flange one by one, and the fastening bolts penetrate through the flange holes of the connecting flange and are screwed in the mounting holes.

Furthermore, a positioning pin is arranged between the large idle gear and the connecting flange.

Furthermore, an oil outlet gap is formed between the first bushing and the second bushing, an oil drainage hole is formed in the side wall of the mounting portion, and the oil drainage hole is communicated with the oil outlet gap.

Furthermore, the side wall of the positioning plate is provided with an observation hole.

Furthermore, a plurality of weight removing holes are formed in the large idle gear.

Furthermore, the small idle gear is connected with the first bushing in an interference fit manner; the installation part is connected with the second bushing in an interference fit mode.

Furthermore, one end of the idle gear shaft is provided with an installation flange, and the end surface of the installation flange is provided with an installation step extending outwards; and the other end of the idle gear shaft is provided with a baffle.

Advantageous effects

The invention has the advantages that:

1. the idler gear assembly is characterized in that an installation part is arranged at one end of a small idler gear, a large idler gear is sleeved in the installation part and is fixedly connected with the installation part through a fastening bolt, and the small idler gear and the installation part are both installed on an idler gear shaft through a lining. The large idler gear is fixedly arranged on the small idler gear through the fastening bolt, so that the relative fixation of the large idler gear and the small idler gear is ensured, the safety reliability and the safety factor of the connection of the large idler gear and the small idler gear are improved, and the requirement that the idler gear assembly can transmit larger torque is met. And the oil outlet that communicates with the inlet port is all seted up to the below of two bushes, and supply lubricating oil to the bush lubrication through the oil outlet, for the bush provides lubricated antifriction, do benefit to the operation of idle gear assembly.

2. Be equipped with out the oil clearance between two bushes, seted up the draining hole on the lateral wall of installation department, the draining hole is linked together with a play oil clearance. Lubricating oil in the bush flows out through the oil drainage hole to avoid the oil pressure to be too high, play the effect of cooling idler gear simultaneously.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is a schematic view of an idler gear shaft configuration of the present invention;

FIG. 4 is a schematic view of the large idler gear of the present invention;

FIG. 5 is a schematic view of the construction of the small idler gear of the present invention;

fig. 6 is a schematic structural diagram of the V-type diesel engine of the invention.

Wherein: 1-an idle gear shaft, 2-a first bushing, 3-a small idle gear, 4-a large idle gear, 5-a positioning pin, 6-a fastening bolt, 7-a baffle, 8-a fixing bolt, 9-an oil inlet hole, 10-an oil drain hole, 11-an oil outlet hole, 12-an installation step, 13-an installation flange, 14-a weight removing hole, 15-a gear positioning pin hole, 16-an installation hole, 17-a flange positioning pin hole, 18-an observation hole, 19-a second bushing, 20-an installation part, 21-a positioning disc, 22-a connecting flange, 23-an oil outlet gap, a 100-V type cylinder body and 101-an idle gear assembly.

Detailed Description

The invention is further described below with reference to examples, but not to be construed as being limited thereto, and any number of modifications which can be made by anyone within the scope of the claims are also within the scope of the claims.

Referring to fig. 1 to 2, the V-type diesel engine idle gear assembly of the present invention includes an idle gear shaft 1, a small idle gear 3, and a large idle gear 4. One end of the small idle gear 3 is provided with a mounting part 20 which is integrated with the small idle gear, and the large idle gear 4 is sleeved in the mounting part 20 and is fixedly connected with the mounting part 20 through a fastening bolt 6. The small idle gear 3 is rotatably mounted on the idle gear shaft 1 through the first bush 2, and the mounting portion 20 is rotatably mounted on the idle gear shaft 1 through the second bush 19. Wherein, the mounting part 20 is connected with the second bushing 19 in an interference fit manner; the small idle gear 3 is connected with the first bushing 2 in an interference fit manner. The idler gear assembly employs a double-bushing structure, providing effective support for the idler gear.

The idler gear assembly of the present embodiment ensures the relative fixing of the large and small idler gears by providing a mounting portion 20 at the end of the small idler gear 3 and fixedly mounting the large idler gear 4 on the small idler gear 3 by means of the fastening bolt 6. And then the integrally mounted large and small idler gears are mounted on the idler gear shaft 1. Through the structure, the idler gear assembly avoids the problem that the requirement for transmitting larger torque of a diesel engine is difficult to meet by adopting the traditional interference fit connection, improves the safety reliability and safety factor of the connection of the large idler gear and the small idler gear, and meets the requirement that the idler gear assembly can transmit larger torque.

Referring to fig. 3, one end of the idler gear shaft 1 of the present embodiment is provided with a mounting flange 13, and an end surface of the mounting flange 13 is provided with a mounting step 12 extending outward. The idle gear shaft 1 is positioned on a positioning hole on the front end face of the V-shaped cylinder block through a mounting step 12. The other end of the idle gear shaft 1 is provided with a baffle 7. When the idler gear shaft is installed, a large idler gear and a small idler gear which are installed integrally are installed on the idler gear shaft 1, the small idler gear 3 is made to be attached to the side wall of the installation flange 13, and then the baffle 7 is installed at the tail end of the idler gear shaft 1 through the fixing bolt 8 so that the large idler gear and the small idler gear are located in the idler gear shaft 1.

Referring to fig. 4 and 5, the end of the mounting portion 20 is provided with a positioning plate 21 having a diameter larger than that of the small idle gear 3. The large idle gear 4 is sleeved in the positioning disc 21. The side wall of the positioning disc 21 is provided with a connecting flange 22, the large idle gear 4 is provided with mounting holes 16 corresponding to the flange holes of the connecting flange 22 one by one, and the fastening bolts 6 penetrate through the flange holes of the connecting flange 22 and are screwed in the mounting holes 16. When the large idle gear 4 is installed, firstly, the large idle gear 4 is sleeved into the installation part 20 from one side of the small idle gear 3, and the large idle gear 4 is sleeved on the positioning disc 21; and then, the fastening bolt 6 passes through a flange hole of the connecting flange 22, and the fastening bolt 6 is screwed in the mounting hole 16, so that the fixed connection of the large idle gear 4 and the small idle gear 3 is realized. Compared with the traditional interference fit connection mode of the large idler gear and the small idler gear, the connection mode fixed through the fastening bolt 6 is more reliable, and transmission of larger torque can be met.

Preferably, a positioning pin 5 is arranged between the large idle gear 4 and the connecting flange 22. Namely, the large idle gear 4 is provided with a gear positioning pin hole 15, and the connecting flange 22 is provided with a flange positioning pin hole 17 corresponding to the gear positioning pin hole 15. The positioning pin 5 penetrates through the flange positioning pin hole 17 and is inserted into the gear positioning pin hole 15. The positioning pin 5 is used for positioning the large idler gear and the small idler gear, so that the phase relation of the large idler gear and the small idler gear is ensured, and the installation is convenient.

An oil inlet hole 9 extending towards the inside of the idle gear shaft 1 is formed in the end face of one end of the idle gear shaft away from the mounting part 20; and oil outlet holes 11 are formed in the side walls of the idle gear shaft 1 below the first bush 2 and the second bush 19, and the oil outlet holes 11 are communicated with the oil inlet hole 9. In the high-speed operation process of the idle gear assembly, lubricating oil enters the oil inlet hole 9 from the V-shaped cylinder body and is supplied to the bushing for lubrication through the oil outlet hole 11, so that lubrication and friction reduction are provided for the bushing, and the operation of the idle gear assembly is facilitated.

An oil outlet gap 23 is formed between the first bush 2 and the second bush 19, an oil drain hole 10 is formed in the side wall of the mounting portion 20, and the oil drain hole 10 is communicated with the oil outlet gap 23. Namely, an oil outlet gap 23 is left between the two bushings, and after the oil outlet gap 23 is filled with lubricating oil, the lubricating oil flows out through the oil drain hole 10 on the mounting part 20, so that the phenomenon that the oil pressure is too high is avoided, and meanwhile, the function of cooling the idle gear is achieved.

Preferably, the side wall of the positioning plate 21 is provided with an observation hole 18 for observing a scale of a mating gear, such as a cam shaft gear, so that the installation is convenient.

Preferably, a plurality of weight-removing holes 14 are formed in the large idle gear 4, so that the large idle gear 4 is light in weight while strength is ensured.

Referring to fig. 6, the V-type diesel engine to which the power output structure of the V-type diesel engine of the present embodiment is applied includes a V-shaped cylinder block 100 and an idler gear assembly 101. Wherein the V-shaped cylinder block 100 is arranged with two rows of cylinder bores arranged in a V-shape, the included angle of the two rows of cylinder bores is less than 180 °, and the idler gear assembly 101 is mounted on the front end face of the V-shaped cylinder block 100.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the structure of the invention, which will not affect the effect of the invention and the practicability of the patent.

Claims

The V-shaped diesel engine idle gear assembly comprises an idle gear shaft (1), a small idle gear (3) and a large idle gear (4), and is characterized in that one end of the small idle gear (3) is provided with an installation part (20) which is of an integrated structure with the small idle gear, and the large idle gear (4) is sleeved in the installation part (20) and is fixedly connected with the installation part (20) through a fastening bolt (6); the small idle gear (3) is rotatably installed on the idle gear shaft (1) through a first bushing (2), and the installation part (20) is rotatably installed on the idle gear shaft (1) through a second bushing (19); an oil inlet hole (9) extending towards the inside of the end face of one end, far away from the mounting part (20), of the idle gear shaft (1) is formed; and the side wall of the idler gear shaft (1) below the first bush (2) and the second bush (19) is provided with an oil outlet (11), and the oil outlet (11) is communicated with the oil inlet (9).
2. The V-type diesel engine idler gear assembly according to claim 1, wherein the end of the mounting portion (20) is provided with a positioning disc (21) with a diameter larger than that of the small idler gear (3), and the large idler gear (4) is sleeved in the positioning disc (21); the side wall of the positioning disc (21) is provided with a connecting flange (22), the large idle gear (4) is provided with mounting holes (16) which correspond to the flange holes of the connecting flange (22) one by one, and the fastening bolts (6) penetrate through the flange holes of the connecting flange (22) and are screwed in the mounting holes (16).
3. An idler gear assembly according to claim 2 characterised in that a locating pin (5) is provided between the large idler gear (4) and the attachment flange (22).
4. The V-type diesel engine idler gear assembly according to claim 1, characterized in that an oil outlet gap (23) is formed between the first bushing (2) and the second bushing (19), an oil drain hole (10) is formed in a side wall of the mounting portion (20), and the oil drain hole (10) is communicated with the oil outlet gap (23).
5. An idler gear assembly according to claim 2 characterised in that the locating plate (21) has a viewing aperture (18) formed in a side wall thereof.
6. An idler gear assembly according to claim 1, characterised in that a plurality of deduplication holes (14) are formed in the large idler gear (4).
7. An idler gear assembly according to claim 1 characterised in that the small idler gear (3) is connected to the first bush (2) in an interference fit; the mounting part (20) is connected with the second bushing (19) in an interference fit mode.
8. The V-type diesel engine idle gear assembly as defined in any one of claims 1-7, characterized in that one end of the idle gear shaft (1) is provided with a mounting flange (13), and the end surface of the mounting flange (13) is provided with an outwardly extending mounting step (12); and the other end of the idle gear shaft (1) is provided with a baffle (7).