JP4090753B2 - Universal joint oil controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a press-fit arrangement in the vicinity of each head end face of the shaft hole that penetrates to the end faces of each of the four heads of the cross shaft, and a bearing arranged around the head after the universal joint stops rotating, and the circumference of these bearings. An elastic elastomer material that prevents oil (grease) that lubricates between the inner surface of the bearing cap from flowing down toward the center of the shaft hole and allows the periphery of the head to be lubricated immediately after resuming rotation, For example, it relates to an oil controller of rubber (natural or synthetic) or elastomer resin.
[0002]
[Prior art]
Such a conventional oil controller has a cup shape in which the center side of the shaft hole is closed and the end surface side of the head is released, and a plurality of grooves extending in the axial direction are formed on the outer peripheral surface of the cup-shaped oil controller. Was to form.
[0003]
Oil (grease) injected from the nipple flows out to the opening end on the head side of the shaft hole through the groove on the outer surface of the oil controller by centrifugal force due to the rotation of the universal joint, and lubricates around the bearing around the cross shaft head . After the universal joint stops rotating, the oil flowing down from the shaft hole in the cross shaft head on the upper side is received and retained by a cup-shaped oil controller so that it can be immediately lubricated around the bearing when rotation is resumed. ing.
[0004]
[Problems to be solved by the invention]
However, in such a conventional cup-shaped oil controller, after the rotation of the universal joint stops, the lubricating oil in the cross shaft head on the upper side passes through a plurality of grooves provided on the outer surface and enters the central portion of the shaft hole. There is a case where the amount of flowing down is large and the lubrication action at the time of resuming the rotation cannot be sufficiently achieved.
[0005]
Accordingly, an object of the present invention is to obtain an oil controller that does not allow any amount of lubricating oil to flow from the periphery of the bearing toward the center of the shaft hole even after the rotation of the universal joint stops, even if the cross shaft head is on the upper side. is there.
[0006]
[Means for Solving the Problems]
To achieve this object, the universal joint oil controller of the present invention is:
Rather large in diameter than the portion that is not expanded in the shaft hole, a barrel portion extending over a short distance in the axial direction toward the center of the shaft hole, to the outer circumferential surface in an annular shape on the upper portion A constricted diameter portion is provided so that a thin flange portion is formed at the top , and the lower portion is flat so that the distance between the diametrically opposed side surfaces is smaller than the shaft hole diameter. The barrel provided with at least one pair of flat side surfaces cut into
A spacer portion protruding in the axial direction from the flange portion toward the opening end portion of the shaft hole, and having a radial dimension smaller than the shaft hole diameter;
Configured together by,
The entire oil controller is retracted inward from the enlarged portion of the shaft hole toward the center of the shaft hole, and is press-fitted and arranged at a position where a predetermined amount of oil can be held,
Even if the spacer part is pushed into the open end side due to manufacturing tolerances or loose fitting after long-term use, and may be pushed to the opening end side by the pressure when lubricating oil is injected or by the centrifugal force due to the rotation of the universal joint, Is configured to have a length in the axial direction that can be held so that the flange portion stays in a portion where the shaft hole is not enlarged by abutting against the bottom surface of the bearing case .
[0007]
According to the oil controller of the present invention, the oil supplied from the nipple communicating with the central portion of the shaft hole increases through a clearance between the shaft hole wall surface and the flat side surface of the trunk portion by centrifugal force when the universal joint rotates. Under pressure, part of the thin flange acts like a check valve and flows out toward the opening end of the shaft hole. Completely prevents backflow.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings.
[0009]
1A and 1B show an oil controller 3 disposed in the shaft hole 2 of one head portion 1A of the cross shaft 1 of the universal joint. However, the oil controller 3 shows the original original state, not the actual press-fitted state that deforms.
[0010]
2A, 2B, and 2C, the oil controller 3 according to the present invention includes a thin flange portion 4 having a diameter larger than that of the shaft hole 2, and the shaft hole 2 from the flange portion 4. The body portion 5 projecting in the axial direction toward the center of the shaft portion and the spacer portion 6 projecting in the axial direction from the flange portion toward the opening end portion of the shaft hole and having a radial dimension smaller than the diameter of the shaft hole are elastic. An integrally formed elastomer material is provided between the flange portion 4 and the body portion 5 and a reduced diameter portion 7 is provided.
[0011]
The body portion 5 is provided with at least one pair of flat side surfaces 8 that have a diameter larger than that of the shaft hole 2 and are cut so as to be flat so that the distance between one diametrically opposed side surface is smaller than the diameter of the shaft hole. . Furthermore, the taper part 9 which chamfered the edge by the side of the axial hole center part of the trunk | drum 5 is provided.
[0012]
In the illustrated embodiment, as shown in FIG. 2B, the side surface on the spacer portion 6 side of the flange portion 4 is tapered toward the central spacer portion 6 to be recessed.
[0013]
As shown in FIG. 1, the shaft hole 2 is enlarged in the radial direction on the opening end side facing the bearing case. Normally, as shown in FIG. 1A, the oil controller 3 is retracted inward from the enlarged portion toward the center of the shaft hole, and is press-fitted and arranged at a position where a predetermined amount of oil can be held. However, even if the press fitting is loose after manufacturing tolerances or long-term use, the pressure at the time of lubricating oil injection through the nipple 10 or the centrifugal force due to the rotation of the universal joint may be pushed to the opening end side, As shown in FIG. 1 (b), the spacer portion 6 of the oil controller 3 of the present invention abuts against the bottom surface of the bearing case 11, and the flange portion 4 stays at a portion where the shaft hole 2 is not enlarged, so that the rotation is stopped. It fulfills the function as an oil controller that prevents backflow in the cross shaft head that is above the oil.
[0014]
On the other hand, since the conventional cup-shaped oil controller is hollow, the press-fitting fitting state in the shaft hole is easy to loosen, and the shaft is driven by the pressure at the time of oil injection (grease lubrication) or the centrifugal force due to the rotation of the universal joint. The oil controller moves to the enlarged portion of the hole, and in this case, the function of the oil controller for preventing oil backflow is not achieved.
[0015]
【The invention's effect】
According to the oil controller of the universal joint of the present invention, unlike the conventional oil controller in which an axial groove is provided on the outer periphery of the cup-shaped hollow body, it has a substantially cylindrical shape that can be press-fitted into the inner wall of the shaft hole. A solid barrel portion provided with a pair of flat side portions and a reduced diameter portion through which oil can be passed, a flange portion that closely adheres to the inner wall of the shaft hole over the entire circumference, and functions as a check valve Even if the fitting is loose, it is a solid body with a spacer part that keeps the flange part in the non-expanded part of the shaft hole, so after the universal joint stops rotating, the flange part prevents backflow of all amount of oil and press fit Even if the fitting state is loose, the flange part does not move to the position of the enlarged part of the shaft hole due to the action of the spacer part, and the function of the oil controller can be fulfilled. .
[0016]
Further, according to the present invention, the manufacturing tolerance of the oil controller is not so strict, and the cost required to meet the strict manufacturing tolerance is not required.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of the use of an oil controller according to the present invention, (a) shows a state where it is set at a normal position in a universal joint, and (b) shows that a press-fitting state is loosened and oil pressure or centrifugal force is applied outward. It is explanatory drawing of the state which moved to.
FIG. 2 shows the oil controller itself of the present invention, where (a) is a plan view, (b) is a side view, and (c) is a bottom view.
[Explanation of symbols]
1 Cross axis
2 shaft hole
3 Oil controller
4 Flange
5 Torso
6 Spacer
7 Reduced diameter section
8 Flat side
9 Taper
10 Nipple
11 Bearing case

Claims (1)

It is a shaft hole that penetrates up to the four head end faces of the cross shaft and is press-fitted into each of the shaft holes having an enlarged portion in the vicinity of each head end face, and placed around the head after the universal joint stops rotating Elasticity that prevents oil that lubricates between the bearings and the inner surface of the bearing cap around these bearings from flowing down toward the center of the shaft hole, and allows the head to be lubricated immediately after resuming rotation In the oil controller for elastomer materials,
The axial hole (2) rather large in diameter than the enlarged portion not in, a barrel portion extending over a short distance in the axial direction toward the center portion of the axial hole (2), the outer periphery in the upper portion A reduced-diameter portion (7) whose surface is recessed in an annular shape is provided, so that a thin flange portion (4) is formed at the top portion , and the lower portion is provided between the diametrically opposed side surfaces. The barrel (5) provided with at least one pair of flat side surfaces cut flat so that the distance is smaller than the axial hole diameter ;
A spacer portion (6) that protrudes in the axial direction from the flange portion toward the opening end of the shaft hole (2) , and has a radial dimension smaller than the shaft hole diameter;
Configured together by,
The entire oil controller is retracted inward from the enlarged portion of the shaft hole (2) toward the center of the shaft hole, and is press-fitted and arranged at a position where a predetermined amount of oil can be held,
Even if the spacer part (6) may be pushed to the opening end side by manufacturing tolerance or loosening of press fitting after long-term use, pressure at the time of lubricating oil injection or centrifugal force due to rotation of the universal joint, The spacer portion (6) abuts on the bottom surface of the bearing case (11), so that the flange portion (4) has an axial length that can be held so as to remain in an unexpanded portion of the shaft hole (2). A universal joint oil controller characterized by its construction .

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