JPH0620906Y2 - Lubricating device for rolling bearings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The rolling bearing lubrication device according to the present invention is incorporated into a transmission such as an automobile or a construction machine so that a drive shaft and a driven shaft can rotate relative to each other. It is used to lubricate the pilot bearings it supports.

(Prior Art) A drive shaft and a driven shaft of a transmission used in an automobile, a construction machine, etc. are combined by a pilot bearing as shown in FIGS. There is.

That is, a concave hole 4 having a circular cross section is formed at the center of the end surface of the drive shaft 3 rotatably supported by the rolling bearing 2 in the casing 1, and the end of the driven shaft 5 is formed in the concave hole 4. Part is inserted.

Between the inner peripheral surface of the recessed hole 4 and the outer peripheral surface of the end of the driven shaft 5, there are formed a plurality of rollers 7, 7 held by a retainer 6, and the inner peripheral surface of the recessed hole 4 is inward. A rolling bearing 8 (pilot bearing) having a raceway and an outer peripheral surface of the end of the driven shaft 5 as an outer raceway is provided to allow relative rotation between the drive shaft 3 and the driven shaft 5.

A synchro mechanism 9 is provided between the drive shaft 3 and the driven shaft 5. When the synchro mechanism 9 is operated, the shafts 3 and 5 are connected to each other so that the driven shaft 5 is synchronized with the drive shaft 3. The rotation of the drive shaft 3 is prevented from being transmitted to the driven shaft 5 by the bearing action of the rolling bearing 8 when the synchronizing mechanism 9 is not operating.

By the way, as described above, it is necessary to supply a sufficient amount of lubricating oil to the rolling bearing 8 for freely rotating the drive shaft 3 and the non-drive shaft 5 during the operation of the transmission. It is necessary to prevent the seizure of the rolling bearing 8.

Therefore, conventionally, as shown in FIGS. 12 to 13, the drive shaft 3
1 to a plurality of oil passages 10 are formed at the end portions of the drive shafts, one end of the oil passages 10 is formed on the outer peripheral surface of the drive shaft 3, and the other end is a concave hole. Lubricating oil (mission oil) existing around the drive shaft 3 in the casing 1 is supplied toward the rolling bearing 8 by opening the inner peripheral surface of the casing 4.

Further, depending on the positional relationship between the step portion 11 for positioning the drive shaft and the rolling bearing 8, as shown in FIG.
The lubricating oil taken in by the above is once put into the oil sump 12 provided at the inner part of the recessed hole 4 and then sent to the rolling bearing 8.

(Problems to be Solved by the Invention) However, any of the conventional lubricating devices configured and operated as described above has the following disadvantages.

That is, in any of the lubricating devices, the function of taking in the lubricating passage 10 existing around the drive shaft 3 is poor, and it is not always possible to take a sufficient amount of lubricating oil into the oil passage 10.

Further, in the case of the conventional lubrication device, the oil passage 10 is formed so as to match the diameter position of the cross section of the drive shaft 3, but when the oil passage 10 is formed at such a position, the drive shaft 3 is formed. Due to the centrifugal force generated by the rotation of the oil passage, a force to send the lubricating oil existing in the oil passage 10 to the outside is added, and the lubricating oil taken into the oil passage 10 is also rolled. I can't send effectively to 8.

JP-B-58-29426, JP-B-62-37276, JP-A-62-67365, JP-B-61-7
7464, 61-85767, 62-
Japanese Patent Publication No. 93457 discloses various structures for efficiently feeding the lubricating oil existing around the drive shaft 3 toward the rolling bearing 8, but any structure is not always sufficient. It was not possible to take in a sufficient amount of lubricating oil, or the structure was complicated and not practical.

The lubrication device for a rolling bearing according to the present invention eliminates any of the above-mentioned inconveniences.

(Means for Solving the Problems) The lubricating device for a rolling bearing according to the present invention has an inner peripheral surface of a concave hole having a circular cross section formed at the center of the end face of the drive shaft, as in the case of the conventional lubricating device described above. It is used to feed the lubricating oil existing around the drive shaft to the rolling bearing mounted between the driven shaft and the outer peripheral surface of the end of the driven shaft inserted into the recess.

In the rolling bearing lubricating device of the present invention, one end is opened on the outer peripheral surface of the drive shaft positioning step formed on the outer peripheral surface of the drive shaft, and the other end is opened on the inner peripheral surface of the recessed hole. The oil passage thus provided is provided eccentrically behind the diametrical position of the drive shaft cross section in the rotational direction.

Along with this, a lubricating oil guide member consisting of a circular ring-shaped introduction plate and a fixed introduction vane is fixed to the positioning step portion, and the introduction vane of the lubrication oil guide member is provided in the oil passage. One end is opposed to the opening, and the interval between the introduction blade and the outer peripheral surface of the step portion is made narrower toward the rear in the rotation direction.

(Operation) In the case of the rolling bearing lubrication device of the present invention configured as described above, the lubricating oil collected from the space around the drive shaft by the guide vanes of the lubricating oil guide member enters the concave hole through the oil passage. And lubricates the rolling bearing provided between the inner peripheral surface of the recess and the outer peripheral surface of the end of the driven shaft.

In the case of the lubricating device of the present invention, not only is the lubricating oil collected by the introduction vanes efficiently fed into the oil passage, but this oil passage is eccentric to the rear in the rotational direction with respect to the diameter position of the drive shaft cross section. The centrifugal force acts on the lubricating oil in the oil passage to a small extent, and the force to send the lubricating oil in the oil passage to the outside is small. A sufficient amount of lubricating oil is supplied to the rolling bearings through.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

1 to 4 show a first embodiment of the present invention, FIG. 1 is a partial sectional view of a transmission provided with a rolling bearing lubricated by a lubricating device of the present invention, and FIG. 2 is FIG. 3 is an AA sectional view, FIG. 3 is a BB sectional view of FIG. 2, and FIG. 4 is an enlarged perspective view of a C portion of FIG.

A concave hole 4 having a circular cross section is formed in the center of the end surface of a drive shaft 3 rotatably supported by a rolling bearing 2 in a casing 1, and the end of a driven shaft 5 is inserted into the concave hole 4. Cage,
A rolling bearing 8 composed of a plurality of rollers 7 and 7 held by a cage 6 is provided between the inner peripheral surface of the concave hole 4 and the outer peripheral surface of the end portion of the drive shaft 3, and this rolling bearing is provided. 8
Allows the relative rotation between the drive shaft 3 and the driven shaft 5 by freely setting the inner peripheral surface of the recessed hole 4 as an inner orbit and the end outer peripheral surface of the driven shaft 5 as an outer orbit.

Oil passages 13, 13 are formed at three positions on the end of the drive shaft 3, and one end of each oil passage 13, 13 is formed on the outer peripheral surface of the drive shaft 3. The other end is opened to the inner peripheral surface of the recessed hole 4, so that the lubricating oil existing around the drive shaft 3 in the casing 1 can be supplied toward the rolling bearing 8. In the case of the illustrated embodiment, flat portions 17, 17 are formed at three positions on the outer peripheral surface of the positioning step portion 11, and one end openings of the oil passages 13, 13 are connected to the flat portions 17, 17. It is provided at the rear position in the rotational direction.

That is, in the case of the oil passages 13 constituting the lubricating device of the present invention, unlike the case of the conventional lubricating device described above, the position formed on the drive shaft 3 is shown by the chain line a, a in FIG. It is eccentric by a distance l behind the diameter position of the drive shaft cross section in the rotational direction.

Further, in order to guide the lubricating oil existing around the drive shaft 3 toward the one-end opening of each oil passage 13, 13 to the positioning step portion 11 in which one end of each oil passage 13, 13 is opened, The lubricating oil guide member 14 is fixed.

The lubricating oil guide member 14 is integrally formed by press-molding a stainless steel plate or the like, and has a circular ring-shaped introduction plate 15 and three pieces bent at right angles from the outer peripheral edge of the introduction plate 15 in the same direction. And the introduction blades 16 and 16.

The lubricating oil guide member 14 as described above holds the inner half of the circular ring-shaped introduction plate 15 between the side surface 11a of the step portion 11 and the end surface 18a of the inner ring 18 of the rolling bearing 2 to form the above step. It is fixed to the part 11. In the state where the lubricating oil guide member 14 is fixed in this way, the introduction blades 16, 16 provided at three positions on the outer peripheral edge of the guide member 14 have flat portions 17, respectively, on the outer peripheral surface of the step portion 11, One end of the oil passages 13, 13 located on the rear side in the rotation direction of 17 is opposed to the opening. And in this state, the introduction blades 16, 16
Between the outer peripheral surface of the stepped portion 11 and the outer peripheral surface of the stepped portion 11, introduction spaces 19 are formed that become narrower toward the rear in the rotation direction.

In the case of the rolling bearing lubrication device of the present invention configured as described above, the introduction vanes 16 and 16 of the lubricating oil guide member 14 along with the rotation of the drive shaft 3 exist in the space surrounding the drive shaft 3. The oil is collected, and the introduction blades 16 and 16 and the flat portion 1
It is taken into the introduction spaces 19 and 19 existing between 7 and 17.

Since the widths of the introducing spaces 19, 19 become smaller toward the rear in the rotational direction, the lubricating oil taken into the introducing spaces 19, 19 is directly sent to the oil passages 13, 13.
Through the oil passages 13 and 13, the oil is sent to the rolling bearing 8 mounted between the inner peripheral surface of the recessed hole 4 and the outer peripheral surface of the driven shaft 5 to lubricate the rolling bearing 8.

In the case of the lubricating device of the present invention which operates in this way, each oil passage 1
Not only the lubricating oil collected by the introduction vanes 16 and 16 is efficiently sent into the insides of the oil passages 3 and 13, but also the oil passage 1
Since 3 and 13 are eccentric to the rear in the rotational direction with respect to the diametrical position of the cross section of the drive shaft 3, the extent to which the centrifugal force acts on the lubricating oil existing in the oil passages 13 and 13 becomes small.

Therefore, the force for sending the lubricating oil existing in the oil passages 13 and 13 to the outside is reduced, and the lubricating oil sent to the oil passages 13 and 13 is efficiently and directly transferred to the rolling bearing 8
As a result, the amount of lubricating oil supplied to the rolling bearing 8 becomes sufficient.

Next, a second embodiment of the present invention shown in FIGS. 5 and 6 will be described.

FIG. 5 is a sectional view similar to FIG. 2 in the first embodiment, FIG. 6 is a sectional view taken along the line DD of FIG. 5, and FIG. 7 is an enlarged perspective view of a portion E of FIG. .

In the case of the present embodiment, the lubricating oil taken in through the oil passages 13, 13 is once stored in the recessed hole 4 due to the positional relationship between the positioning step portion 11 formed on the outer peripheral surface of the drive shaft 3 and the rolling bearing 8. The oil is stored in the oil sump 12 provided in the inner part and then sent to the rolling bearing 8.

Along with this, the lubricating oil guide member 14 fixed to the stepped portion 11
As the guide plate 15, the guide blades 16 and 16 are formed by bending on the inner peripheral edge of the guide plate 15, and the guide plate 15 is brought into contact with the side end surface 20 located outside the step portion 11 to drive A lubricating oil guide member 14 is fixed to the shaft 3.

Since other configurations and operations are the same as those in the first embodiment, the same parts are designated by the same reference numerals and duplicate description will be omitted.

The lubricating oil existing in the space around the drive shaft 3 passes through the oil passage 1
Introducing blades 16 and 1 for feeding toward the openings at one end of
If 6 is a mountain-shaped one as shown in FIGS. 8 to 9 or a kamaboko-shaped one as shown in FIGS. The collection efficiency can be further improved.

(Effects of the Invention) The lubrication device for a rolling bearing according to the present invention is constructed and operates as described above, so that it can be manufactured at a relatively low cost with a simple structure, but a mounting portion for a rolling bearing such as a pilot bearing. It is possible to feed a sufficient amount of lubricating oil, and it is possible to reliably prevent seizure of the rolling bearing incorporated in the transmission or the like.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a partial sectional view of a transmission provided with a rolling bearing lubricated by a lubricating device of the present invention, and FIG. 2 is FIG. 3 is an AA sectional view, FIG. 3 is a BB sectional view of FIG. 2, FIG. 4 is an enlarged perspective view of a C portion of FIG. 2, and FIGS. FIG. 5 is a sectional view similar to FIG. 2 in the first embodiment, FIG. 6 is a sectional view taken along line DD of FIG. 5, and FIG. 7 is an enlarged perspective view of portion E of FIG. FIGS. 8 to 11 show another four examples of the shape of the lubricating oil guide member, respectively, a perspective view similar to FIG. 4 or FIG. 7, and FIG. 12 a rolling system lubricated by a conventional lubricating device. Partial cross-sectional view of a transmission provided with bearings, No. 13
12 is a sectional view taken along line F-F in FIG. 12, and FIG. 14 is a partial sectional view of a transmission provided with a rolling bearing lubricated by another conventional lubricating device. 1: casing, 2: rolling bearing, 3: drive shaft, 4: concave hole, 5: driven shaft, 6: cage, 7: roller, 8: rolling bearing, 9: synchro mechanism, 10: oil passage, 11: step,
11a side surface, 12: oil sump, 13: oil passage, 14: lubricating oil guide member, 15: introduction plate, 16: introduction blade, 17: flat portion, 18: inner ring, 18a: end surface, 19: introduction space, 2
0: Side end face.

Claims (4)

[Scope of utility model registration request] 1. A rolling bearing mounted between an inner peripheral surface of a concave hole having a circular cross section formed at the center of an end surface of a drive shaft and an outer peripheral surface of an end portion of a driven shaft inserted into the concave hole. A lubrication device for a rolling bearing that feeds lubricating oil existing around the drive shaft, wherein one end is formed on the outer peripheral surface of the drive shaft positioning step portion formed on the outer peripheral surface of the drive shaft and the inner peripheral surface of the concave hole is formed. An oil passage having the other end opened is provided eccentrically behind the diameter position of the drive shaft cross section in the rotational direction, and a circular ring-shaped introduction plate is fixed to the positioning step portion and the introduction plate. Of the lubricating oil guide member is fixed so that the introducing vane of the lubricating oil guide member faces the one end opening of the oil passage, and the distance between the introducing vane and the outer peripheral surface of the step portion is set in the backward direction of rotation. Lubrication device for rolling bearings that narrows toward the end. 2. The rolling bearing according to claim 1, wherein an inner peripheral surface of the recessed hole forms an inner raceway of the rolling bearing, and an outer peripheral surface of an end portion of the driven shaft forms an outer raceway of the rolling bearing. Lubrication device. 3. The lubrication device for a rolling bearing according to claim 1, wherein the other end of the oil passage opens into an oil sump formed in the deep part of the recess. 4. The lubrication device for a rolling bearing according to claim 2, wherein the other end of the oil passage opens at a part of an inner raceway formed on the inner peripheral surface of the recess.