JPH0389063A - Lubricating part structure for rotating mechanism - Google Patents

Abstract

PURPOSE:To prevent the outburst of lubricating oil from an upper opening so as to maintain stable lubricating performance by partitioning an oil pocket into a first oil pocket communicated with the upper opening and a second oil pocket communicated with a lubricating oil guide port by a spacer plate with a communicating port formed only on the rotation axis face side. CONSTITUTION:An oil pocket 6 is partitioned by a spacer plate with an opening part 11 of the specified width formed only on the rotation axis face side so as to form an outer opening part 5. An impeller 8 rotated accompanied by the rotation of the rotation axis 1 is installed in the oil pocket 6 partitioned to the outer opening part 5 side. Lubricating oil in the oil pocket 6 is thereby blocked by the spacer plate 12 even with the generation of centrifugal force so as to be prevented from bursting out onto the outer opening part 5 side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a structure of a lubricating part of a rotating mechanism.

(Prior Art) As shown in, for example, Japanese Utility Model Application Publication No. 64-36760, in general, in a rotating mechanism such as an automobile transmission, there is a gap between the rotating shaft and various gears loosely fitted to the rotating shaft. In addition, a predetermined lubricating oil supply passage is formed for supplying lubricating oil to each sliding surface portion such as between the rotating shaft and the bearing portion,
A lubricating section structure is adopted that performs lubrication by circulating lubricating oil through the lubricating oil supply passage in accordance with shaft rotation.

Specifically, the structure of the conventional lubricating section is as shown in FIGS. 8 and 9, for example. That is, in the figure, the reference numeral 1 is a rotating shaft such as a rear output shaft of an automobile transmission, and the rear end 1a of the rotating shaft I is connected to a rotating shaft via a pair of sealed bearings (roller bearings with a sealed structure) 2A and 2B. For example, it is rotatably supported on the rear end 3a side of a transmission case 3 for an automobile.

A lubricating oil supply passage 4 extending along the central axis is formed in the rear end 1a of the rotating shaft 1, and lubricating oil is supplied to the sliding surface side of each gear via the lubricating oil supply passage 4. It is designed to supply

On the other hand, at the end of the lubricating oil supply passage 4 of the rotating shaft l,
Lubricating oil introduction holes 4 a and 4 b are formed extending in the radial direction. The lubricating oil introduction holes 4 a + 4 b are open on the outer circumferential surface of the rotating shaft 1 .

An oil pocket 6, which is a closed space, is formed between the side wall surface of the case cover 9 and the side surface of the sealed bearing 2A on the outer periphery of the rotating shaft where the lubricating oil introduction holes 4a and 4b are opened. There is. The bottom of the oil pocket 6 (
The center shaft side) communicates with the lubricating oil introduction holes 4 a and 4 b, and the upper portion communicates with an opening 5 for lubricating oil inflow formed at the edge of the transmission case 3. The opening 5 is located at such a position that the lubricating oil scraped up by, for example, a lubricating oil scraping chain or the like is collected by a rib or the like and then flows in in a concentrated manner.

An impeller 8 having inclined blades 7a, 7b, and 7c in the scooping direction as shown in FIG. 9 is housed in the oil pocket 6. Then, the lubricating oil flowing into and filling the oil pocket 6 from the opening 5 is caused by the rotation of the impeller 8 in the direction of the arrow, to the lubricating oil introduction hole 4a,
4b into the lubricating oil supply passage 4 in the rotating shaft l.

(Problem to be Solved by the Invention) In the case of the lubricating oil supply structure shown in FIGS. 8 and 9 above, if the rotating shaft 1 is not rotating or is rotating at a considerably low speed, it is true that The lubricating oil in the oil pocket 6 is introduced into the lubricating oil supply passage 4 side.

However, when the rotational speed of the rotating shaft l exceeds a certain value, a large centrifugal force acts on the lubricating oil that is about to flow into the lubricating oil introduction holes 4a and 4b, and the lubricating oil gradually flows into the impeller. There is a problem in that the liquid is drawn toward the outer peripheral edge of the opening 5, and in the worst case, it is blown out from the opening 5.

Therefore, in the case of the above-mentioned conventional structure, it is actually impossible to maintain an appropriate lubrication function.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above problems, and includes a rotating shaft provided with a lubricating oil supply passage on the shaft body side, and a An oil pocket formed around the outer periphery of the lubricating oil inlet, an opening for supplying lubricating oil formed in the upper part of the oil pocket, and a vane for transmitting lubricating oil pressure rotatably fitted inside the oil pocket. A first oil pocket that communicates with the upper opening by a spacer plate that forms a communication port only on the rotating shaft surface side, and a first oil pocket that communicates with the lubricating oil introduction. The second communicating with the mouth
partitioned into two spaces with an oil pocket, and the above-mentioned second
This is characterized in that the impeller for feeding the lubricating oil pressure is fitted in the oil pocket space of the oil pocket.

(Function) That is, in the above-mentioned lubricating part structure of the present invention, the inside of the oil pocket is partitioned from the external opening side by a spacer plate that forms an opening of a predetermined width only on the rotating shaft surface side, and the oil pocket is partitioned from the external opening side. An impeller that rotates with the rotation of the rotating shaft is installed in the oil pocket, so even if centrifugal force acts on the lubricating oil in the oil pocket, it is blocked by the spacer plate and blown out to the outside opening. No fear arises.

Additionally, as a result, the amount of lubricating oil that has flowed into the oil pocket will not decrease unless it flows into the lubricating oil supply passage through the lubricating oil inlet, so the pump action is not performed in this state. When the impeller for sending the lubricating oil pressure rotates, the oil pressure in the oil pocket becomes higher than the centrifugal force caused by the rotation of the rotating shaft, and this pressure forces the lubricating oil into the lubricating oil inlet. The lubricating oil is pushed out to the lubricating oil supply passage side through the lubricating oil supply passage.

(Effects of the Invention) Therefore, according to the lubricating portion structure of the rotating mechanism of the present invention, a stable lubricating function can be maintained regardless of the rotational speed of the rotating shaft.

(Embodiment) First, FIGS. 1 and 2 show the structure of a lubricating part of a rotating shaft according to a first embodiment of the present invention.

That is, in the figure, first, reference numeral I is a rotating shaft such as a rear output shaft of an automobile transmission, and the rear end portion 1a of the rotating shaft 1 is connected to a pair of sealed bearings (roller bearings with a sealed structure) 2A, 2.
For example, an automobile transmission case 3 via B
is rotatably supported on the rear end case 3a side.

A lubricating oil supply passage 4 is formed in the rear end 1a of the rotating shaft 1 and extends along the central axis thereof, and lubricating oil is supplied to the sliding surface side of each gear through the lubricating oil supply passage 4. Lubricating oil is supplied to the introduction hole.

On the other hand, at the end of the lubricating oil supply passage 4 of the rotating shaft 1, there are two lubricating oil introduction holes 4a, 4 extending in the radial direction.
b is formed. The lubricating oil introduction holes 4a and 4b are open on the outer circumferential surface of the rotating shaft l.

Then, the lubricating oil introduction holes 4 a and 4 b were opened.
- An oil pocket 6, which is a closed space, is formed on the outer periphery of the rotating shaft (■) between the side wall surface 9a' of the side cover 9' of the transmission case and the side surface 20 of the seal hair ring 2A. . The oil pocket portion 6 in this embodiment is press-fitted and fixed into the end case 3a of the transmission case 3, and is fixed to the end case 3a of the transmission case 3.
A boss portion 8a' of an impeller 8', which will be described later, is fitted and fixed to the side.
Two oil pocket spaces, a first oil pocket space 6A and a second oil pocket space 6B, are formed by spacer plates 1 and 12 that have a gap 11 of a predetermined width for drawing in lubricating oil between the outer peripheral surface and the outer peripheral surface. It's partitioned off. The impeller 8 extends to the right from the boss portion 8a' and is expanded radially outward from the extending cylinder body portion 8b'.
' is located and rotatably installed within the second oil pocket space 6B. The second oil pocket space 6B horizontally passes through the inner flow path 16 of the extending cylindrical body portion 8b' and communicates with the lubricating oil introduction holes 4a and 4b on the rotating shaft l side. ing.

Note that reference numeral 15 in FIG. 1 is a nut that fixes the impeller 8' to the rotating shaft 1.

Further, as shown in FIG. 2, for example, the impeller 8' is not a forward facing blade forming a scooping surface with respect to the rotation direction, but a backward facing blade 7 that changes to form a pressing surface for sending lubricating oil pressure.
a' + 7 b' r 7 c'. Further, the upper part of the first oil pocket space 6A communicates with an opening (external opening) 5 formed at the edge of the transmission case 3 for lubricating oil inflow.

The opening 5 is located at such a position that the lubricating oil scraped up by, for example, a chain for scraping up the lubricant pool is collected by the ribs and then flows in in a concentrated manner.

As described above, in the lubricating part structure of the rotating mechanism according to the first embodiment of the present invention, the spacer plate 12 that forms the opening 11 of a predetermined width only on the rotating shaft surface side allows the oil pocket 6 to be connected to the opening 5 side. Since an impeller 8' that rotates with the rotation of the rotary shaft 1 is installed in the second oil pocket space 6B partitioned off from the partition and the opening 5 side, the second
Even if centrifugal force acts on the lubricating oil in the oil pocket space 6B, the spacer plate 12 blocks the lubricating oil in the opening 5.
There is no risk of it blowing out to the side.

Moreover, as a result, the lubricating oil that has flowed into the second oil pocket space 6B flows through the lubricating oil introduction hole 4a.

As long as the lubricating oil does not flow into the lubricating oil supply passage 4 side via the lubricating oil supply passage 4, the amount will not decrease. Therefore, when the impeller 8' having a pumping action rotates in this state, centrifugal force due to the rotation of the rotating shaft 1 The oil pressure in the second oil pocket 6B becomes higher than the action of the force, and the lubricating oil is forcibly pushed out to the lubricating oil supply passage 4 side by this pressure.

Therefore, according to the structure of the lubricating part of the rotating mechanism of this embodiment, a stable lubricating function can always be maintained regardless of the rotational speed of the rotating shaft 1.

Next, FIGS. 3 to 7 show the structure of a lubricating part of a rotating mechanism according to a second embodiment of the present invention.

This example shows a more specific structure when installed in the rear output shaft of an automobile's transmission case. A rear plate 32 for damming is provided to prevent the lubricating oil from leaking out.

That is, first of all, in FIG. 3, reference numeral 3 is the same transmission case as described above, and 3a is its end case. When viewed from the side with the outer cover removed, the end case 3a looks like the one shown in FIG. 4, for example. It looks like this.

In other words, inside the end case 3a is a driven sprocket 4 fixed to the front output shaft 47.
6 and a drive sprocket 41 fixed to the rear output shaft l end 1a are disposed, and a chain 40 is stretched between them. An oil reservoir section in which lubricating oil 45 is stored is formed at the bottom thereof.

Therefore, when the drive sprocket 41 rotates in the direction of the arrow due to the rotation of the rear output shaft l, the driven sprocket 46 is also rotated in the same direction via the chain 40. Lubricating oil 45 in the oil reservoir
is scraped upward as shown by the imaginary arrow line.

On the other hand, a rib 30 of a predetermined width is provided inside the end case 3a, and the lower edge of the rib 30 extends toward the rear edge of the lubricant intake opening 5 of the oil pocket 6. Therefore, the lubricating oil scraped up by the chain 40 is
It is collected by the rib 30 and flows down through the opening 5 into the oil pocket.

In the oil pocket 6, the oil pocket space between the side surface of the thrust washer 9 and the side surface (seal wall surface) 20 of the two seal bearings is formed into a first oil pocket space by a spacer plate 12, as in the first embodiment. 6A and a second oil pocket space 6B, and the impeller 8' is basically constructed exactly the same as that of the first embodiment. However, as shown in FIG. 5 (front side) and FIG. 6 (back side), the impeller 8' of this embodiment has fewer blades (7a' to 7r') than the first embodiment. The pump efficiency is improved by increasing the number of pumps.

Furthermore, in the case of this embodiment, a rear plate 32 as shown in FIG. 7, for example, is fitted on the second oil pocket space 6B side adjacent to the impeller 8'. The rear plate 32 has a flange portion 32a that is fitted in contact with the inner peripheral surface of the second oil pocket 71-space 6B, and a flange portion 32a that is fitted into the outer peripheral surface of the extending side cylindrical body portion 8b' of the impeller 8'. A stepped portion 32 for forming a lubricating oil pressure feeding space 37 between the fitting hole portion 32b for the purpose of providing the lubricant and the seal bearing side surface 20 when fitted into the second oil pocket space 6B.
C, and a communication hole 34 for supplying the lubricating oil pressure-fed from the impeller 8' side to the lubricating oil pressure feeding space 37 side. Therefore, according to this configuration, the lubricating oil that is force-fed to the lubricating oil introduction holes 4a and 4b by the rotation of the impeller 8' is first supplied through the upper communication hole 34 of the rear plate 32. That will happen. As a result, even when the rotation of the impeller 8' is stopped, the first oil pocket space 6A and the second oil communicating with the first oil pocket space 6A via the lubricating oil flow passage 11 are Since a certain amount of lubricating oil is always retained in the impeller 8' housing portion of the pocket space 6B, there is an advantage that it is not necessary to supply lubricating oil evenly at a priming level compared to the first embodiment.

Note that the lubricating oil supply passage 4 formed on the rotating wheel l side is not limited to the one formed inside the shaft main body as shown in each of the above embodiments, but for example, Needless to say, it also includes groove-like grooves formed on the outer peripheral surface. In particular, if a concave groove-shaped lubricating oil supply passage structure is adopted and the passage is arranged helically in the axial direction, the lubricating oil will be transferred by its own rotation. The lubrication effect is further improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cross-sectional view showing the structure of a lubricating part of a rotating mechanism according to the i-th embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A in FIG. 3 is a sectional view showing the structure of a lubricating part of a rotating mechanism according to a second embodiment of the present invention, FIG. 4 is a side view of the same main part, and FIGS. 5, 6, and 7 are the same. FIG. 8 is a sectional view showing the structure of a lubricating section of a conventional rotating mechanism, and FIG. 9 is a sectional view taken along the line B--B in FIG. 8. ■...Rotating shaft la...Rotating shaft end 2A, 2B...Seal bearing 3...
・Transmission case 3a... End case 4... Lubricating oil supply passages 4a, 4b... Lubricating oil introduction hole 5... Opening 6...・Oil pocket 6A...First oil pocket space 6B...
・Second oil pocket space 7a' to 7c' ・・Blade 8′ ・・・Impeller 12 ・・・Spacer plate 32 ・・Rear plate knee 8 Fig. 1

Claims (1)

[Claims] 1. A rotating shaft with a lubricating oil supply passage on the shaft body side, an oil pocket formed around the outer periphery of the lubricating oil inlet in the lubricating oil supply passage of the rotating shaft, and an oil pocket formed on the upper part of the oil pocket. In the lubrication part structure of a rotating mechanism, the lubricating part structure of a rotating mechanism includes an opening for supplying lubricating oil, and an impeller for transmitting lubricating oil pressure that is rotatably fitted in the oil pocket. A first oil pocket that communicates with the upper opening and a second oil pocket that communicates with the lubricating oil inlet by a spacer plate that forms a communication port only on the side.
partitioned into two spaces with an oil pocket, and the above-mentioned second
A structure for a lubrication part of a rotating mechanism, characterized in that the impeller for transmitting the lubricant oil pressure is fitted in the oil pocket space of the rotary mechanism.