JPH11294568A - Gear lubricating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the feed quantity of a lubricant by providing multiple recesses on the rim inner diameter section of a gear, providing an oil feed passage from the recesses toward a mesh section, and lubricating the mesh section of the gear via the oil feed passage from the recesses with the centrifugal force by the rotation of the gear when lubricating the mesh section of the gear. SOLUTION: A driven side gear 1 and a driving side gear 2 are meshed with each other, and the driven side gear 1 is rotated by the rotative drive of the driving side gear 2. When a lubricant is fed to the recesses 12 of the driven side gear 1 from an oil jet as the gears 1, 2 are rotated, the lubricant fed to the recesses 12 is discharged from the outlet of a tip section 14 through an oil feed passage 13 via the centrifugal force by the rotation of the driven side gear 1. The discharged lubricant flows to the rear side in the rotating direction of the driven side gear 1 and reaches a mesh section 30 of a tooth section 11 having the tip section 14 and the tooth section 21 of the driving side gear 2. The mesh section 30 is surely lubricated, and the tooth sections 11, 21 are smoothly cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying oil to a meshing portion of a gear which rotates while meshing with each other, for example, in a gear for an aircraft engine.

[0002]

2. Description of the Related Art Conventionally, a gear for an aircraft engine of this type rotates at a high speed and is subjected to a high load. Therefore, an oil jet is used to spray a lubricating oil near a meshing portion of the gear, thereby forming an oil film on the meshing portion. A lubrication method for lubricating by forming and cooling the teeth is generally used.

[0003]

However, in the conventional lubricating method, since the high-speed rotating teeth prevent the lubricating oil, the lubricating oil of the gears which need to be lubricated and cooled need to be lubricated. There is a problem that the amount of lubricating oil reaching the tooth surface is very small. For this reason, a refueling amount including a loss is required, and there is a problem that the engine supply / discharge system becomes large. Moreover, in order to make the lubricating oil reach the tooth surfaces of the gears meshing with each other, a high-speed oil jet flow is required against the gear rotating at a high speed (peripheral speed: 50 to 100 m / s). Therefore, a high-pressure lubrication system is required, and from this point, there is a problem that the lubrication system is enlarged.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lubricating oil that can be smoothly and reliably supplied to a meshing portion of a gear. It is an object of the present invention to provide a gear refueling method that can reduce the refueling pressure and reduce the size and weight of a refueling / discharging system.

[0005]

A first aspect of the present invention is a gear lubrication method for lubricating a meshing portion of a gear that rotates while meshing with each other, wherein a plurality of recesses are provided in advance in a rim inner diameter portion of the gear. An oil supply passage is provided from the recess toward the engagement portion, and lubricating oil supplied from oil supply means is received in the recess, and centrifugal force due to rotation of the gear causes the gear to pass through the oil supply passage from the recess through the oil supply passage. The lubricating oil is supplied to the meshing portion. According to the first aspect of the invention, lubricating oil is supplied to the recess provided in the inner diameter portion of the rim of the gear by the lubricating means, and the lubricating oil in the recess is centrifugally generated by the rotation of the gear, and the lubricating oil is supplied to the gear through the oil supply passage. Lead to the meshing part. According to a second aspect of the present invention, the outlet of the oil supply passage opens at the tooth tip of the driven gear. According to the present invention, since the lubricating oil flowing out from the outlet of the oil supply passage opened to the tooth tip of the driven gear flows rearward in the rotation direction of the gear, the lubricating oil flows through the tooth tip. The meshing portion between the tooth portion having the gear portion and the gear portion of the driving gear that meshes with the tooth portion is easily reached, and the lubrication of the meshing portion and the cooling of the tooth portion are effectively performed. Further, the third aspect of the present invention does not necessarily need to be used in combination with the second aspect. However, when the oil supply passage is provided in the drive gear, the outlet of the oil supply passage is opened in the tooth groove of the drive gear. To According to the third aspect, the lubricating oil coming out of the outlet of the oil supply passage opened in the tooth groove portion of the drive side gear,
Since the oil flows backward in the rotational direction of the gear, the lubricating oil smoothly reaches a meshing portion between the tooth portion on the rotating direction rear side connected to the tooth groove portion and the tooth portion of the driven gear meshing with the tooth portion. Ensure lubrication and cooling of the teeth.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing gears that mesh with each other, and FIG. 2 is a sectional view showing a driven gear. Reference numerals 1 and 2 in the figure denote a driven gear and a drive gear that mesh with each other. A plurality of recesses 12 are formed in the rim inner diameter portion 10 of the driven side gear 1 corresponding to the respective tooth portions 11, and an oil supply passage 13 communicating with these recesses 12 is formed in each of the tooth portions 11. It is formed up to the tooth tip 14 through the center. In addition, an oil jet (oil supply means) OJ for supplying lubricating oil to the recess 12 is provided toward the recess 12,
The direction of injection of this oil jet OJ is
The lubricating oil is set to be supplied to the meshing portion 30 immediately before the meshing of the meshing portion starts and immediately after the meshing ends. Here, the reason why the outlet of the oil supply passage 13 is provided in the tooth tip portion 14 is to provide smooth oil supply to the meshing gear tooth surfaces to be described later and to surely cool the gear teeth themselves.
This is because the strength of the gear teeth is considered. That is, when the tooth portions 11 and 21 are engaged with each other, a large force is applied to the root portion by tension and bending, and it is not desired to weaken the root portion and generate root stress. Therefore, it is provided on the tooth tip portion 14 which does not easily affect the root portion.

When the drive side gear 2 is provided with an oil supply passage, similarly to the driven side gear 1, a plurality of recesses 22 are provided in the rim inner diameter portion 20 corresponding to the respective tooth portions 21, and these recesses 22 are provided. An oil supply passage 23 communicating with the recess 22 is provided in the tooth groove 24. In FIG. 1, the driven side gear 1 and the driving side gear 2 have recesses 12 and 22,
Although illustrated as providing the gears 3 and 23, the invention is not limited to this, and may be provided on only one of the driven gear 1 and the driving gear 2.

Next, a case where the oil supply method of the present invention is carried out using the driven gear 1 and the driving gear 2 configured as described above will be described. First, the driven gear 1 and the driving gear 2 meshing with each other are rotated by driving the driving gear 2 in the same manner as in the related art, and the driven gear 1 meshing with the driven gear 1 is rotated. At this time, with the rotation of each gear 1, 2,
When lubricating oil is supplied from the oil jet OJ toward the recess 12 of the driven gear 1, the lubricating oil supplied to the recess 12 passes through the oil supply passage 13 by centrifugal force generated by rotation of the driven gear 1. It is discharged from the outlet of the oil supply passage 13 opened to the tooth tip portion 14. Since the lubricating oil flowing from the outlet of the oil supply passage 13 flows rearward in the rotation direction of the driven gear 1, the lubricating oil of the tooth 11 having the tooth tip 14 and the driving gear 2 meshing with the tooth 11 are formed. The engagement portion 30 with the tooth portion 21 is easily reached. Therefore, the oil film is smoothly formed on the tooth surface of the meshing portion 30, and the meshing portion 3 is formed.
0 is ensured, and the teeth 11, 21
Cooling is performed smoothly.

On the other hand, when the lubrication method of the present invention is applied to the drive side gear 2, as with the driven side gear 1, the rim inner diameter portion 2 of the drive side gear 2 is rotated together with the rotation of each gear 1, 2.
The lubricating oil is supplied to the recess 22 formed at zero. In this case, the lubricating oil supplied to the recess 22
Due to the centrifugal force caused by the rotation of, the oil is discharged from the outlet of the oil supply passage 23 opened to the tooth groove portion 24 via the oil supply passage 23. Since the lubricating oil flowing out of the outlet of the oil supply passage 23 flows rearward in the rotational direction of the driving gear 2, the driven gear meshes with the tooth 21 on the rear side in the rotational direction connected to the tooth groove 24. The meshing portion 30 of the side gear 1 with the tooth portion 11 smoothly reaches. As a result, the engagement portion 3
0 lubrication and cooling of the tooth portions 11 and 21 are performed without any trouble.

In this way, by applying the lubrication method of the present invention to the driven gear 1 or the driving gear 2,
Even in high-speed and high-load gears for aircraft engines,
The lubricating oil can be smoothly and reliably supplied to the meshing portions 30 of the teeth 11, 21.
The cooling of the tooth portions 11 and 21 can be easily performed. Moreover, a plurality of recesses 12 and 22 are formed in the rim inner diameter portions 10 and 20 of the gears 1 and 2, and the recesses 12 and 22 of the recesses 12 and 22 that are involved in the meshing portion 30 are lubricated. Since the oil is supplied in a limited manner, the amount of oil supply can be reduced, and the size of the engine supply / discharge system can be reduced. In addition, the lubricating oil is
1, the lubrication pressure can be reduced as compared with the conventional method, and the lubrication system can be reduced in size and weight. Therefore, the diameter of the nozzle of the oil jet OJ can be increased, so that the risk of clogging of the nozzle due to dust or the like is reduced, and the reliability of the engine can be improved accordingly. In the present embodiment, the method of refueling gears for aircraft engines has been described. However, the present invention is not limited to this, and it goes without saying that the present invention can be applied to the case where lubricating portions of various gears are refueled.

[0011]

As described above, according to the first aspect of the present invention,
According to this, lubricating oil is supplied to the recess provided in the inner diameter portion of the rim of the gear by the lubricating means, and the lubricating oil in the recess is guided to the meshing portion of the gear via the oil supply passage by centrifugal force due to rotation of the gear. Thereby, lubrication of the meshing portion and cooling of the tooth portion can be performed smoothly and reliably. In addition, the lubricating oil is limitedly supplied to the concave portion of the plurality of concave portions formed in the inner diameter portion of the rim which is involved in the meshing portion, so that the amount of lubricating oil can be reduced, and the supply and drainage of oil can be reduced. The system can be reduced in size and weight, and the lubricating oil can be smoothly supplied to the meshing portion without being disturbed by the teeth, so that the lubricating pressure can be reduced as compared with the conventional method. Therefore, the size and weight of the refueling system can be reduced, and the diameter of the nozzle of the refueling means can be increased. Therefore, the risk of clogging of the nozzle due to dust or the like is reduced, and the reliability of the system is reduced. Can be improved. According to the second aspect of the present invention, since the lubricating oil flowing from the outlet of the oil supply passage opened to the tooth tip of the driven gear flows rearward in the rotation direction of the gear, the lubricating oil is removed from the tooth. By easily reaching the meshing portion between the tooth portion having the tip portion and the tooth portion of the drive side gear meshing with the tooth portion, lubrication of the meshing portion and cooling of the tooth portion can be effectively performed, There is no adverse effect on the tooth root, which is the most problematic in strength. Further, according to the third aspect of the present invention, since the lubricating oil flowing out from the outlet of the oil supply passage opened in the tooth groove portion of the drive side gear flows to the rear side in the rotation direction of the gear, the rear side in the rotation direction connected to the tooth groove portion. When the lubricating oil smoothly reaches the meshing portion between the tooth portion on the side and the tooth portion of the driven gear meshing with the tooth portion, the lubrication of the meshing portion and the cooling of the tooth portion can be reliably performed, and the strength is improved. It does not adversely affect the root of the tooth.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of gears that mesh with each other, showing one embodiment of the present invention.

FIG. 2 is a sectional view showing a driven gear.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 driven side gear 2 drive side gear 10, 20 rim inner diameter portion 11, 21 tooth portion 12, 22 concave portion 13, 23 oil supply passage 14 tooth tip portion 24 tooth groove portion 30 meshing portion OJ oil jet (oil supply means)

Claims (3)

[Claims] 1. A gear oiling method for oiling a meshing portion of a gear that rotates while meshing with each other, wherein a plurality of recesses are provided in advance in a rim inner diameter portion of the gear, and an oiling passage is formed from the recesses toward the meshing portion. The lubricating oil supplied from the lubrication means is received in the recess, and the lubricating oil is supplied from the recess to the meshing portion of the gear via the lubrication passage by centrifugal force due to rotation of the gear. Gear refueling method. 2. The gear refueling method according to claim 1, wherein an outlet of the refueling passage opens at a tooth tip of the driven gear. 3. The gear lubrication method according to claim 1, wherein an outlet of the lubrication passage opens into a tooth groove portion of the driving gear.