JPH02199352A - Self-lubricating device for inside of rotary shaft - Google Patents

Abstract

PURPOSE:To aim at self-lubricating a rotary shaft and at making a self-lubricating device lightweight by providing an oil sump with a required water head, above a rotary shaft which pierces through an oil feed body comprising an oil pressure generating member having a circumferential oil recess and an oil pressure generating recess, and which is provided in its thick wall section with oil holes and a rotary plate for promoting the distribution of oil. CONSTITUTION:Oil is led to the peripheral surface 4b of the rotary shaft 4 from an oil sump 2 provided above the rotary shaft 4 with a required water head, through a communication hole 6 and oil holes 3f, 3g. The rotary shaft 4 pierces through an oil feed body 3 in which the outer race 14a of a roller bearing 14 is fitted, through the intermediary of a seal member 6, and a circumferential oil recess for distributing oil 9 is formed in oil feed body 3. Oil holes 4e for communicating a space 4h of the rotary shaft 4 which receives an intermediate shaft 19, with the oil feed hole 3g, are formed in a thick wall section 4g of the rotary shaft 4, and these holes 4 being adapted to be rotated along the inner periphery of an oil pressure generating member 5 provided in the oil feed body 3, and a rotary plate 7 for promoting the distribution of oil is fixed to the rotary shaft 4. Accordingly, self-lubrication may be made even at a high rotational speed, and thereby it is possible to reduce the cost owing to the simplified and lightweight mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a self-lubricating device for a rotating shaft, and particularly to a rotating shaft that requires lubrication and a rotating plate that rotates outside the rotating shaft. This self-lubricating device generates a large hydraulic pressure that overcomes centrifugal force by guiding the oil being carried around to a special hydraulic pressure generating body, and sufficiently enables self-lubrication of a rotating shaft rotating at high speed without using forced lubrication.

BACKGROUND OF THE INVENTION Conventionally, various structures have been adopted for the rotating shafts of vehicle engines, transmissions, etc., but there are rotating shafts in which the rotating shaft is formed hollow and is further supported by needle bearings or the like. It is possible to lubricate a complex rotating mechanism part, such as one in which a rotor is inserted, only through the outer rotating shaft, but in order to supply oil from the outer periphery of the rotating shaft to the inner rotating shaft through the oil hole, Since the oil pressure has to overcome the centrifugal force that accompanies the rotation of the outer rotating shaft, lubrication that occurs naturally may result in insufficient lubrication, making it necessary to use a forced lubrication system using an oil pump. Ta. However, in rotating mechanisms such as transmissions that are not equipped with an oil pump, the only option available is a self-lubricating system that temporarily stores the oil thrown upward by the rotation of the gears in an oil reservoir and allows it to flow naturally into each part. There are many cases.

According to such a conventional self-lubricating device, when lubricating the input shaft of a transmission through an oil hole, for example, the idling speed is 60.
Lubrication is possible up to about 0 rpm, but at higher speeds, the centrifugal force of the oil increases in proportion to the square of the rotational speed, making it almost impossible to lubricate the inside of the rotating shaft. Ta.

Purpose The present invention has been made to eliminate the drawbacks of the prior art described above, and its purpose is to provide an oil reservoir disposed above a rotating shaft that requires lubrication, and a core oil reservoir. The oil supply body is formed with an oil circulation recess that guides oil from the reservoir to the area around the rotating shaft by natural fall, and where the oil is taken around as the rotating shaft rotates, and multiple oil holes eccentrically located from the axis are thick-walled. A rotating shaft is formed in the rotating shaft, and four hydraulic generating parts are formed that generate hydraulic pressure that overcomes the centrifugal force accompanying the rotation of the rotating shaft by causing oil to flow in and be rotated by being fixed in the oil circulation recess of the oil supply body. Oil entrainment for generating hydraulic pressure is provided by comprising a generator and a rotary plate fixed to a part integral with the rotating shaft so as to rotate around the hydraulic pressure generator and promote entrainment of the oil. The purpose is to make the shaft extremely strong so that, for example, a needle bearing inside the input shaft of a transmission can sufficiently lubricate itself even when rotating at high speeds of about 3000 rpm or more, without using a forced lubrication device. This also ensures that sufficient lubrication is provided to the inside of, for example, a complex sub-transmission, thereby preventing bearing seizure and improving its durability and reliability. Furthermore, by making it possible to lubricate even the complicated internal structure by self-lubrication, it is possible to simplify the mechanism of the lubrication device, reduce its weight, and reduce its cost.

Configuration In short, the present invention provides an oil reservoir disposed with a predetermined head above a rotating shaft that requires lubrication, and a core oil reservoir that guides oil around the rotating shaft by natural fall. an oil supply body in which an oil circulation recess is formed in which the oil is entrained as the oil rotates; A plurality of angularly inclined oil holes are formed in the thick part of the rotating shaft, and the oil is fixed to the oil circulation recess of the oil supply body and rotates with the rotation of the rotating shaft. A hydraulic generator having a hydraulic pressure generating recess formed therein, which generates hydraulic pressure that overcomes the centrifugal force generated by rotation of a rotating shaft and can supply oil to a core oil hole when the oil holes face each other, and the hydraulic generator The invention is characterized by comprising a rotary plate fixed to a part integral with the rotary shaft so as to rotate around the rotary shaft and promote rotation of the oil.

The present invention will be explained below based on embodiments shown in the drawings. The self-lubricating device l for the inside of a rotating shaft according to the present invention includes an oil reservoir 2,
It includes an oil supply body 3, a rotating shaft 4, a hydraulic pressure generating body 5, and a rotating plate 7.

The oil reservoir 2 has enough energy E to supply oil above the rotating shaft 4 that requires lubrication by overcoming the passage resistance of the needle bearing 18 and the passage between the rotating shaft 4 and the intermediate shaft 19.
For example, in the case of the transmission 6, it is formed integrally with the transmission case 8 and is open at the top, allowing rotation of each gear (not shown). As a result, the oil stored at the bottom (not shown) of the transmission case 8 is splashed up, and a part of it drips here, so that the oil 9 is collected as shown in the figure.

The oil supply body 3 supplies the oil 9 from the oil reservoir 2 to the positional energy E.
, guided to the surrounding area 4a of the rotating shaft 4 by natural fall,
In addition, an oil-circulating recess 3a is formed in which the oil 9 is entrained as the rotating shaft 4 rotates, and is basically annular, with a central portion 3b having a hollow cylindrical shape. A metal ring 10 is attached to the central recess 3c.

An oil supply hole 3f that communicates with the communication hole 6a to the oil reservoir 2 is formed in the side surface 3e of the outer peripheral part 3d. It communicates with an oil supply hole 3g opened at 3a, and the entrance of the oil supply hole 3g is closed by a plug screw 11. Further, three step portions 3h, 3i, and 3j are formed on the radially inner side of the side surface 3e before reaching the oil circumferential recess 3a. When assembled to the transmission 6, the metal ring 13 is attached to the stepped portion 3h, and the stepped portion 31 is attached to the stepped portion 3h.
The outer race 14a of the roller bearing 14 is fitted into each of the outer races 14a of the roller bearing 14, and the stepped portion 3j forms a gap with respect to the roller bearing 14.

The rotating shaft 4 is an input shaft in the transmission 6 shown in FIG. 1, and a spline 4C that fits into a clutch disc (not shown) is formed at one end 4b of the rotating shaft 4, and a spline 4C that fits into a clutch disc (not shown) connects the central portion 3b of the oil supply body 3 with a sealing member. 16, and as shown in FIG. 2, is eccentric by a predetermined distance from the axis 4d, that is, by an eccentric amount e, and inclined by a predetermined angle θ with respect to the normal direction from the axis 4d. Multiple oil holes 4
e is formed in the thick wall portion 4g of the hollow portion 4f, and the crude oil hole is a space in which an intermediate shaft 19 for a sub-transmission (not shown) is rotatably fitted into the hollow portion via a needle bearing 18. 4h, so that the needle bearing 18 can be supplied with oil.

The reason why the oil hole 4e is eccentric by an eccentric amount e and also inclined by an angle θ with respect to the normal direction is because the centrifugal force Fc that tries to push the oil 9 from the inside to the outside of the rotating shaft 4 is Since it faces in the linear direction, the effective force F that tries to push the oil 9 outward along the direction of the oil hole 4e by inclining the oil hole 4e by an angle θ is F=Fccos θ. The larger the angle θ, the smaller it becomes; for example, in the illustrated example, the angle θ = 25', so F = Fc c
This is because os 25 ′ =0,906 Fc, which is 9% or more smaller than the case where the oil hole is opened in the normal direction. This also made it possible to reduce the oil pressure for lubrication.

Further, the rotating shaft 4 is press-fitted into the inner race 14b of the roller bearing 14, and a retaining ring 20 is attached thereto.

The hydraulic pressure generating body 5 is fixed by a screw 23 to the farthest position of the oil circulation recess of the oil supply hole 3g of the oil circulation recess 3a of the oil supply body 3. Then, the oil 9 that is rotated along with the rotation of the rotating shaft 4 and the rotating plate 7 is caused to flow into the rotating shaft 4.
A strong hydraulic pressure is generated that overcomes the centrifugal force Fc acting on the oil 9 in the oil hole 4e caused by the rotation of the oil hole 4e.
A hydraulic pressure generating recess 5a is formed so that oil 9 can be supplied to the oil hole when the oil holes face each other.

The oil pressure generating recess 5a has an inlet end 5b at the outermost periphery, is recessed in an arc shape from the inlet end in the circumferential direction, and an outlet end 5C has a radius so as to face the oil hole 4e. It is formed facing inward.

The rotary plate 7 is fixed to a portion integral with the rotary shaft 4, for example, the inner race 14b, with bolts (not shown), or is fixed to a portion integral with the rotary shaft 4, such as the inner race 14b, so as to rotate around the hydraulic pressure generating body 5 and promote oil rotation. It is fixed by a stopper 20 as shown in FIG. has been done.

Function The present invention is constructed as described above, and its function will be explained below. In the transmission 6, when the rotating shaft 4 rotates, each gear (not shown) rotates, and the oil stored at the bottom of the transmission case 8 is splashed up by the gear and drips from the top of the oil sump 2 into the core oil sump. As shown in FIG. 1, oil 9 accumulates in the oil reservoir 2.

Then, the communication hole 6 is heated by the positional energy E1 from the oil reservoir.
a, flows into the oil supply hole 3f of the oil supply body 3 as shown by arrow A, then descends through the oil supply hole 3g of the oil supply body 3 as shown by arrow A, and from the oil supply hole flows into the oil supply hole 3f of the oil supply body 3 as shown by arrow A. The positional energy E flows out into the recess 3a. By touching the circumference 4a of the rotating shaft 4 and the protrusion 7b of the rotating plate 7, the rotating shaft and the rotating plate will forcefully rotate the rotating shaft in the direction of the arrow, and the inner circumferential portion of the rotating plate 7 will be Oil 9 starts rotating along oil circulation recess 3a at the same speed as the circumferential speed of oil 7a. In this case, the oil 9
Let W be the weight, V be the speed, and g be the acceleration of gravity, then the kinetic energy E2 of the oil 9 will be as follows, and the oil 9 will have a kinetic energy E2 proportional to the square of the speed. The kinetic energy E2 and the positional energy E of this oil 9 are the hydraulic pressure generating recess 5.
The oil flows into a and is pushed along the arc-shaped recess, thereby being converted into pressure energy. In this way, pressure energy E3, which is the sum of the kinetic energy E2 and positional energy E1 that the oil 9 had until then, is generated in the oil pressure generating recess 5a, and the oil pressure based on this is generated in the oil hole of the rotating shaft 4. This overcomes the centrifugal force Fc acting on the oil 9 in the oil hole 4e and the passage resistance of the needle bearing 18 and the passage between the rotary shaft 4 and the intermediate shaft 19, and when the oil hole 4e faces the outlet end 5c of the hydraulic pressure generator 5. ,
The oil 9 in the oil pressure generating recess 5a flows into the oil hole 4e,
Needle bearing 1 that supports the intermediate shaft 19 inside it
Oil 9 can be supplied to 8 for lubrication.

In this case, the effective force F that pushes the oil 9 outward in the radial direction within the oil hole 4e is F=Fccos θ, as described above, and for example, when the angle θ is 25°, the effective force F is 0 .906 Fc, so it is easy to use the hydraulic pressure generated in the hydraulic pressure generating recess 5a to generate a force that overcomes the centrifugal force Fc. Furthermore, as the rotational speed of the rotating shaft 4 and the rotating plate 7 increases, the kinetic energy E2 of the oil 9 carried around by the rotating shaft and the rotating plate increases in proportion to the square of the rotating speed.
The hydraulic pressure generated in the hydraulic pressure generating recess 5a also increases in proportion to the square of the rotational speed. Therefore, even if the centrifugal force Fc acting on the oil 9 in the oil hole 4e increases in proportion to the square of the rotation speed of the rotating shaft 4, the rotation The needle bearing 1 that supports the intermediate shaft 19 is capable of sufficiently lubricating the rotating shaft by itself even when the shaft 4 rotates at high speed.
It became possible to completely lubricate the 8. In particular, in the present invention, the rotating plate 7 that rotates outside the oil supply body 3 allows the oil to be rotated more strongly without relying solely on the rotation of the oil by the rotating shaft 4. can generate large hydraulic pressure.

As a result of the test, it was confirmed that even when the rotating shaft 4 was rotated up to 3000 rpm or more, sufficient self-lubrication could be achieved.

Note that an auxiliary transmission (not shown) is attached to the hollow portion 4f of the rotating shaft 4, and an intermediate shaft 19 is provided therefor.By adopting this self-lubricating device 1, the clutch side of the transmission 6 is It has become possible to provide an auxiliary transmission in this section, and it has also become possible to simplify the structure and reduce the weight of the transmission 6.

In the above embodiment, the self-lubricating device 1 for the inside of the rotating shaft 4 was explained as being for the transmission 6 of a vehicle, but its application is not limited to the transmission (it is applicable to all rotating mechanisms). Needless to say, it is applicable.

Effects The present invention provides an oil reservoir disposed above a rotating shaft that requires lubrication as described above, and a system that guides oil from the oil reservoir to the surroundings of the rotating shaft by natural fall and accompanies the rotation of the rotating shaft. The oil supply body is formed with an oil circulation recess in which the oil is entrained, the rotating shaft has a plurality of oil holes eccentric from the axis formed in the thick wall, and the oil is fixed in the oil circulation recess of the oil supply body and rotated in the oil supply body. A hydraulic generating body is formed with four hydraulic generating parts that allow oil to flow in and generate hydraulic pressure that overcomes the centrifugal force accompanying the rotation of the rotating shaft, and a hydraulic generating body that rotates around the hydraulic generating body to promote the rotation of oil. Since the rotary shaft is equipped with a rotary plate fixed to an integral part, for example, the needle bearing inside the input shaft of the transmission can be rotated to 3000 rpm without using a forced lubrication device.
It has the effect of being able to provide sufficient self-lubrication even during high-speed rotation, and as a result, for example, it becomes possible to provide sufficient lubrication to the inside of a complex sub-transmission, which prevents the bearing from seizing. It has the effect of improving durability and reliability. In addition, it is possible to lubricate even complex internal structures by self-lubrication.
The effect of simplifying the mechanism of the lubricating device, reducing its weight, and reducing costs can be obtained.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the main parts of the self-lubricating device for the inside of the rotating shaft, and Figure 2 is the first diagram showing the mutual relationship between the oil supply body, the rotating shaft, and the oil.
In the figure, the oil supply body is a partial vertical cross-sectional side view seen from the right side, and FIG. 3 is a partially cutaway perspective view of the oil supply body showing a portion of the hydraulic pressure generating body. ■ is a self-lubricating device inside the rotating shaft, 2 is an oil reservoir, 3 is an oil supply body, 3a is an oil circumferential recess, 3b is a central part, 4 is a rotating shaft, 4a is a periphery, 4d is a shaft center, 4e is an oil hole , 5 is a hydraulic pressure generating body, 5a is a hydraulic pressure generating recess, 7 is a rotating plate, 7a is an inner peripheral surface,
7b is a protrusion, and 9 is oil.

Claims (1)

[Scope of Claims] 1. An oil reservoir disposed with a predetermined head above a rotating shaft that requires lubrication, and an oil reservoir that guides oil around the rotating shaft by natural fall from the oil reservoir and an oil supply body in which an oil circulation recess is formed in which the oil is entrained as the shaft rotates; The rotating shaft has a plurality of oil holes inclined at a predetermined angle formed in the thick wall portion, and the oil is fixed to the oil circulation recess of the oil supply body and allows the oil to be rotated along with the rotation of the rotating shaft to flow therein. A hydraulic generator having a hydraulic pressure generating recess formed therein, which generates hydraulic pressure that overcomes the centrifugal force generated by the rotation of the rotating shaft and can supply oil to the oil holes when the oil holes face each other, and the hydraulic pressure generating body. A self-lubricating device for a rotating shaft, comprising a rotating plate fixed to an integral part of the rotating shaft so as to rotate around the body and promote the rotation of the oil. 2. Self-lubrication according to claim 1, wherein the rotary plate is formed in an annular shape and has a large number of protrusions formed radially inward on its inner circumferential surface. Device.