JPH102344A - Lubrication device for universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly supply lubrication oil to a cap for an oil reservoir by increasing the area of an oil passage to intercommunicate a cross-from feed oil hole, formed in an universal joint by a spider, and a cup for an oil reservoir in the shape of a cylinder with a bottom. SOLUTION: Two chamfered outer wall surfaces 10 where two sides of the outer periphery of a cup 9 for oil reservoir in the shape of a cylinder with a bottom and an arcuate outer side wall surface 15 are provided. Inclining surface 11 continued to the respective two chamfered outer wall surfaces 10 are formed on a bottom. The cup 9 for an oil reservoir is fitted in each of round holes 6 formed in the axes of the shaft ends 2 of a spider 1. An oil passage to intercommunicate a cruciform oil feed hole 8 and the cup 9 for an oil reservoir consists of the inner wall surface of the round hole 6, the two chamfered outer wall surface 10, and the inclining surface 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint lubrication device using a spider (cross shaft).

[0002]

2. Description of the Related Art In order to supply lubricating oil to bearings on each shaft of a spider (cross shaft) of a universal joint, a cross-shaped lubrication hole communicating with each shaft end is provided in the spider.
High-viscosity lubricating oil such as grease is injected into this cross-shaped oil supply hole, and the spider is supplied to the bearing from each shaft end through the cross-shaped oil supply hole. When the high lubricating oil becomes liquid and the rotation of the universal joint stops,
The lubricating oil flows back toward the center of the cross-shaped oil supply hole, creating a space between each end of the spider and the lubricating oil flowing back toward the center of the cross-shaped oil supply hole due to the temperature drop, and the viscosity increases.
Since lubricating oil is not supplied to the bearings of each shaft portion of the spider until the rotational friction heat of the universal joint rises again and the lubricating oil becomes liquid, there is a possibility that wear and seizure may occur.

In order to solve such a problem, a bottomed cylindrical oil reservoir cup communicating with a cross-shaped oil supply hole is fitted and mounted in a round hole formed in the shaft center of each shaft end of the spider. ,
Lubricating oil, such as grease, which has been liquefied by the rotational friction heat of the universal joint from the cross-shaped oil supply hole due to the centrifugal force caused by the rotation of the universal joint is supplied and stored in the oil reservoir cup, and the universal joint stops rotating. The lubricating device of the universal joint, in which the lubricating oil in the oil sump cup is supplied to the bearings of the respective shaft portions of the spider when it rotates again, is disclosed in Japanese Utility Model Publication No. 61-4 / 1986.
No. 742.

[0004]

Problems to be Solved by the Invention
In the lubricating device for the universal joint No. 42, the communication structure between the cross-shaped oil supply hole and the bottomed cylindrical oil sump cup is provided with an axial groove passage on the outer wall surface of the oil sump cup. This is a form in which a cross-shaped oil supply hole and a bottomed cylindrical oil reservoir cup communicate with each other through a groove passage. Since the passage area is small in the groove passage, the lubricating oil may gel in the groove passage and become clogged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a large oil passage for communicating a cross-shaped oil supply hole with a bottomed cylindrical oil sump cup so that lubricating oil can be smoothly supplied into the oil sump cup. To provide a universal joint lubricating device.

[0006]

According to the present invention, there is provided a spider, comprising: a circular hole formed at a shaft center of a shaft end of each shaft portion of a spider; A lubricating device for a universal joint fitted with a bottomed cylindrical oil reservoir cup communicating with a bottomed oil supply hole, wherein a two-chamfered outer wall surface is formed by chamfering both outer peripheral surfaces of the bottomed cylindrical oil reservoir cup. Formed on the outer wall of the arc,
The bottom surface is provided with an inclined surface which is continuous with each of the two chamfered outer wall surfaces, and the oil reservoir cup is fitted and mounted in a circular hole formed at the shaft center of the shaft end of each of the shaft portions. An oil passage communicating between the cross-shaped oil supply hole and the oil reservoir cup is formed by an inner wall surface, a two-chamfered outer wall surface, and an inclined surface.

Further, in the above construction, a fin-like projection is provided on the outer wall surface of the arc of the oil reservoir cup so as to wedge with the inner wall surface of the round hole at each shaft end.

Further, in the above configuration, an arc-shaped projection is provided on the upper surface of the arc-shaped outer wall surface of the oil reservoir cup.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a spider, and 2 denotes a shaft portion of four shafts. A bottomed cylindrical oil reservoir cup 9 communicating with a cross-shaped oil supply hole 8 formed in the spider 1 is fitted into a round hole 6 formed in the shaft center of the shaft end of each shaft portion 2. It is installed. A lubricating oil, such as grease, which has a high viscosity at room temperature and is liquefied by heat is injected into the cross-shaped oil supply hole 8 from a nipple (not shown) attached to a lubrication port 16 provided in a cross portion of the spider 1 at normal temperature.
In addition, a tapered peripheral edge 7 that expands in the outer diameter direction is formed on the circumference of the open end of the round hole 6.

Each of the shafts 2 has a bearing cap 3 indicated by a chain line with a needle bearing 4 interposed between the shaft 2 and the peripheral surface thereof, and a thrust washer 5 between the shaft 2 and an end surface thereof.
It is mounted with intervening.

As shown in FIGS. 2 to 5, the oil reservoir cup 9 according to the present invention has a two-chamfered outer wall surface 10 and a circular arc outer wall surface 15 which are chamfered on both outer peripheral surfaces of a bottomed cylindrical oil reservoir cup 9. Is formed, and the inclined surface 11 continuous with each of the two chamfered outer wall surfaces 10 is provided on the bottom surface.

The arc-shaped outer wall surface 15 of the oil reservoir cup 9
May be provided with fin-shaped projections 13 that wedge into the inner wall surface of the round hole 6 at each shaft end, and the arc-shaped projections 12 may be provided on the upper surface of the arc outer wall surface 15.

The oil reservoir cup 9 is fitted and mounted in a round hole 6 formed at the shaft center of the shaft end of each shaft 2, and as shown in FIGS. The cross-shaped oil supply hole 8 is formed by an inner wall surface, a two-chamfered outer wall surface 10 and an inclined surface 11.
And an oil passage 14 communicating the oil reservoir cup 9 with the oil reservoir cup 9.

Therefore, the lubricating oil injected into the cross-shaped oil supply hole 8 is centrifugally generated by the rotation of the spider 1 to move from the inclined surface 11 provided on the bottom surface of the oil reservoir cup 9 to the inner wall surface of the round hole 6. The oil is supplied to the oil reservoir cup 9 through the oil passage 14 between the chamfering outer wall surface 10 and the tapered peripheral edge 7 of the round hole 6 on the upper surface of the oil reservoir cup 9.

As shown in FIGS. 4 and 5, the oil passage 14 has a large semicircular passage area due to the inner wall surface of the round hole 6 and the two chamfered outer wall surfaces 10, and the oil passage 14 may be clogged. Instead, the lubricating oil is smoothly supplied through the oil passage 14 into the oil reservoir cup 9.

The arc outer wall surface 15 of the oil reservoir cup 9
When the circular projection 12 is provided on the upper surface of the
Even when the tapered peripheral edge 7 is not formed, the thrust washer 5 and the arc-shaped projection 12 interposed between the end face of the shaft portion 2 and the arc-shaped projection 12 are in contact with each other, and a circle is formed on the upper end of the two-chamfered outer wall surface 10. A gap is formed by the height of the arc-shaped protrusion 12, and the gap is supplied with lubricating oil into the oil reservoir cup 9.

The arc-shaped outer wall surface 1 of the oil reservoir cup 9
5 is a fin-shaped projection 13 that wedges into the inner wall surface of the round hole 6 at each shaft end
Is provided, the fin-like projections 13 are wedge-fitted so as to bite into the inner wall surface of the round hole 6, and the oil reservoir cup 9 is firmly fitted to the round hole 6, and the spider 1 is rotated. The centrifugal force prevents the oil reservoir cup 9 from moving out of the round hole 6, and the oil reservoir cup 9 presses the bearing cap 3 by moving away from the round hole 6 to prevent the oil reservoir cup 9 from being pushed out of the shaft portion 2 in the direction in which the oil reservoir cup 9 comes off.

[0018]

As described above, according to the present invention, a cylindrical oil reservoir cup with a bottom is formed with two chamfered outer wall surfaces and two arcuate outer wall surfaces obtained by chamfering both outer peripheral surfaces of the cup, and the bottom surface is provided with the two-sided outer wall.
An inclined surface continuous with each of the chamfered outer wall surfaces is provided, and the oil reservoir cup is fitted and mounted in a circular hole formed at the axis of each shaft end of the spider, and the inner wall surface of the circular hole and the two chamfered outer wall surfaces are fitted. The oil passage has a large passage area, and the oil passage does not become clogged. Can be smoothly supplied through the oil passage into the oil reservoir and stored in the oil reservoir. This has the advantage of preventing wear and seizure of the shaft and ensuring lubrication of each shaft.

[Brief description of the drawings]

FIG. 1 is a front view of a cross section of a part of the present invention.

FIG. 2 is a side view of an oil sump cup.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a plan view of an oil sump cup.

FIG. 5 is a bottom view of the oil sump cup.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spider 2 Shaft part 3 Bearing cap 4 Needle bearing 5 Thrust washer 6 Round hole 7 Tapered periphery 8 Small diameter hole 5a Small diameter hole 6 Large diameter hole 6a Large diameter hole 7 Step 8 Cross-shaped oil supply hole 9 Oil reservoir cup 10 2 chamfered outer wall surface 11 inclined surface 12 arc-shaped projection 13 fin-shaped projection 14 oil passage 15 arc outer wall surface

Claims (3)

[Claims] A bottomed cylindrical oil reservoir cup communicating with a cross-shaped oil supply hole formed in the spider is fitted into a round hole formed in the shaft center of the shaft end of each shaft portion of the spider. In the lubricating device of the universal joint fitted together, the outer peripheral side surfaces of the bottomed cylindrical oil reservoir cup are chamfered into a two-chamfered outer wall surface and an arc outer wall surface, and the bottom surface is provided with each of the two-chamfered outer wall surfaces. A continuous inclined surface is provided, and the oil reservoir cup is fitted and mounted in a round hole formed at the axis of the shaft end of each of the shaft portions, and the inner wall surface, the two chamfered outer wall surface, and the inclined surface of the round hole are provided. A lubricating device for a universal joint, wherein an oil passage communicating the cross-shaped oil supply hole and the oil sump cup is formed by the method. 2. The lubricating device for a universal joint according to claim 1, wherein a fin-shaped projection is provided on an outer wall surface of the arc of the oil reservoir cup so as to wedge with an inner wall surface of the round hole of each shaft end. 3. The universal joint lubricating device according to claim 1, wherein an arc-shaped projection is provided on an upper surface of an arc outer wall surface of the oil reservoir cup.