JP2581472Y2 - Universal joint - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint.

[0002]

2. Description of the Related Art A conventional universal joint is shown in FIG.
As shown in FIG. 1, a cross shaft (spider) 1, a pair of yokes 2, an oil seal 3, a snap ring 4, a cap 5 </ b> A in which a bearing (needle roller) 5 is provided, and the like. The cross shaft 1 has a cross body 1A.
The shaft portions 6 are provided at the ends orthogonal to each other, and an oil supply hole 7 is formed at the center of each of the shaft portions 6 so as to intersect. A grease nipple 8 communicating with the oil supply hole 7 is provided at the center of the main body 1A. Further, the pair of yokes 2 are formed with shaft holes 9A and 9B on coaxial lines facing the forks 2A and 2B, respectively, and the yokes 2 are fixed to shaft ends (not shown).

Therefore, a pair of shaft portions 6 and 6 of the cross shaft 1 located on the same coaxial line are inserted into shaft holes 9A and 9B of the different yoke 2, respectively, so that the oil seals 3 and
After the snap ring 4 is fitted, the shaft hole 9A of the yoke 2
A cap 5A is screwed and fixed to 9B, and a bearing 5 is interposed between the cap 5A and the shaft portion 6.

In the universal joint shown in FIG. 9, a lubrication hole 3 passing through the axis of each shaft portion 2 is formed in the cross-shaped shaft 1 at right angles. An oil reservoir 4 is connected to the two sides. A cylindrical oil controller 5 formed of an oil-resistant plastic is disposed in the oil reservoir 4, and a groove 5a is formed on the outer surface of the oil controller 5 in the generatrix direction. A bearing cap 8 is fitted to each shaft portion 2 of the cruciform shaft 1 via a needle roller 6 and an oil seal 7, and an oil supply hole is provided at the center of the cruciform shaft 1. 3 is provided with a grease nipple 9 communicating with
178523).

Further, the universal joint shown in FIG. 10 has a large-capacity grease reservoir 3 having a cubic shape with the axis of the shaft 2 as a diagonal line at the center of the cross shaft main body 1. An oil hole 4 communicating with the grease reservoir 3 is provided in the axis of the portion 2. A grease nipple 5 for injecting grease into the grease reservoir 3 is provided at a crotch portion 1a between adjacent shaft portions 2 of the cross shaft main body 1, and a needle roller 6 and A bearing cap 8 is fitted through an oil seal 7 (Japanese Utility Model Laid-Open No. 59-39323).

[0006]

However, the conventional universal joint shown in FIG. 6 is, as shown in FIG.
The spacing between the forks 2A, 2B of the yoke 2 is considerably smaller than the length between the ends of the shafts 6, 6 of the cross shaft 1. Therefore, when assembling the cross shaft 1 into the yoke 2, first, one shaft portion 6 of the cross shaft 1 is sufficiently inserted into the shaft hole 9 A from the side surface of the yoke 2, and then the other shaft hole 9 of the yoke 2 is inserted.
B, the other shaft portion 6 of the cross shaft 1 must be inserted, so that the cross body 1A is a crotch portion 1a between the adjacent shaft portions 6, 6.
If it is not greatly hollowed out, it will not be possible to incorporate it. As a result, the crotch portion 1a between the shaft portions 6 and 6 becomes structurally weak. In particular, providing the grease nipple in the crotch portion 1a improves workability and visibility, but further reduces the structural strength. become.

Further, as shown in FIG. 8, the grease G flows outward from the grease nipple 8 provided at the center of the cross body 1A through the lubrication holes 7 in a cross shape, respectively.
At the portion where the end face of the bearing 5 is in contact with the bottom surface of the bearing 5), and is then discharged to the center of the cross body 1A after passing between the shaft portion 6 and the bearing 5. Therefore, the grease discharge performance is poor, and the lubricity to the bearing is reduced. Further, since a gap (end float) between the end faces of the cross-section, which is one of the causes of the rotational imbalance, was at the tip of the cross shaft 1,
The weight at the time of balance correction increases. Also, if the diameter of the shaft 6 and the diameter of the bearing 5 of the cross shaft 1 are increased in order to extend the life of the yoke 2 of the same size, the structure in which the bearing is housed in the yoke causes various disadvantages such as an increase in the size of the universal joint. was there.

Further, in the conventional example shown in FIG. 9, since the grease nipple 9 is attached to the center of the cross-shaped shaft 1, workability and visibility are deteriorated when lubricity is reduced as described above. . Further, in the conventional example shown in FIG. 10, since the grease nipple 5 is attached to the crotch portion 1a of the cross shaft main body 1, there are various problems that the strength and lubricity are reduced as described above. .

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is easy to assemble into a yoke, can be reduced in size, and can be refueled. The purpose is to provide a grease nipple that has good visibility and lubrication workability, improve lubricity to bearings, and reduce the amount of weight when correcting rotational balance. The cylindrical body is provided with flat portions parallel to each other at orthogonal positions on the outer peripheral surface thereof, and bottomed shaft cylinder holes are formed on the coaxial lines of the respective plane portions, and at the bottom portion of each shaft cylinder hole from the center. A connecting shaft, which is provided with an oil supply hole that opens and a grease nipple communicating with the oil supply hole between the flat portions, is connected to the fork of the yoke by a shaft portion inserted through the bearing and the oil seal into the shaft cylinder hole. Univer characterized by being fixed In Le joint.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is an exploded perspective view of the universal joint according to the present invention, FIG. 2 is a perspective view of the universal joint during assembly, FIG. 3 is a partially cutaway view of the universal joint after assembly, and FIG. FIG. 5 is an explanatory view of the flow of grease of the universal joint.

Referring to FIG. 1, reference numeral 1 denotes a connecting shaft formed of a cylindrical body, having a parallel opposing surface 2 formed in the axial direction thereof, and a flat portion 3 parallel to each other in the horizontal and vertical directions on its outer peripheral surface. When it is formed, the adjacent flat part 3,
Each of the flat portions 3 has a cylindrical tube hole 5 having a predetermined depth at the center thereof.

Reference numeral 6 denotes an oil supply hole provided in the connection shaft 1, which is formed from the center of the connection shaft 1 toward the center of the bottom of each shaft cylinder hole 5. A grease nipple 7 communicating with the oil supply hole 6 is provided. In addition,
In the figure, reference numeral 8 denotes a shaft portion to be inserted into each shaft tube hole 5 of the connecting shaft 1, 9 denotes a bearing (needle roller) inserted into the shaft tube hole 5, 10 denotes an oil seal, and 11 denotes the shaft portion 8. Reference numeral 12 denotes a set screw for the holding plate 11.

Reference numerals 13 and 14 denote yokes.
Reference numeral 4 denotes axial holes 16A and 16B having the same diameter as the shaft 8 on the same axis of the facing forks 15A and 15B, and reference numeral 17 denotes a female screw hole into which the set screw 12 is screwed. The yokes 13 and 14 are respectively fixed to ends of a rotating shaft (not shown).

Next, the assembling of the present invention will be described. The connecting shaft 1 is provided with a bearing 9 in each shaft tube hole 5 in the horizontal direction.
And the oil seal 10 is installed, and inserted between the forks 15A and 15B of one yoke 14. Then, the axis of the shaft cylinder hole 5 of the connecting shaft 1 and the shaft holes 16A, 16
After the shaft portion 8 is inserted into the shaft cylinder hole 5 so that the axis of the shaft B coincides with the axis line B, the holding plate 11 abuts against the back surface of the shaft portion 8, and the set screw 12 is screwed into the female screw hole 17 of the yoke 14. Figure 2
As shown in (5), the shaft portion 8 is fixed to the forks 15A and 15B, respectively.

Next, the yoke 1 is placed between the forks 15A and 15B of the other yoke 13 by the same means as described above.
4, the shaft 8 is inserted into the shaft bore 5 of the connection shaft 1 via the bearing 9 and the oil seal 10, and as shown in FIG. 1
Fix to 3. As a result, the connection shaft 1 rotates about the shaft portion 8.

As shown in FIGS. 4 and 5, grease G supplied from the grease nipple 7 is connected to the connecting shaft 1.
Flows from the center of the shaft through the oil supply hole 6 toward each shaft hole 5, and is radially dispersed at the end face between the bottom surface of each shaft hole 5 and the front surface of the shaft portion 8 (the bottom surface of the bearing 9). After passing through the bearing 9 between the inner peripheral surface of the cylindrical hole 5 and the outer peripheral surface of the shaft portion 8, the flat portion 3 of the connecting shaft 1 and the forks 1 of the yokes 13, 14
It is discharged to the outside from between the back surfaces of 5A and 15B. As described above, since the grease G is constantly discharged outward from the center of the connecting shaft 1 by centrifugal force, the lubricity of the bearing is improved, and since the rolling end face approaches the center side of the connecting shaft 1, the grease is transferred. The retention at the end face is improved.

[0017]

As described above, the universal joint according to the present invention has flat portions parallel to mutually orthogonal positions on the outer peripheral surface of the columnar body, and has a bottomed cylindrical bore on the coaxial line of each flat portion. When each of them is formed, an oil supply hole that opens from the center to the bottom of each shaft cylinder hole is provided, and a connection shaft formed by providing a grease nipple communicating with the oil supply hole between the flat portions is provided inside the shaft cylinder hole. The structure is fixed to the fork of the yoke by the shaft inserted through a bearing and an oil seal. Therefore, (1) the assembling to the yoke is easy and the size can be reduced. (2) Since there are no structurally weak parts,
Even with the same size, the strength is significantly improved. (3) Since the grease nipple is attached to the outer peripheral surface of the connecting shaft, visibility is good and lubrication workability is improved. (4) Since the turning end face approaches the center of the connecting shaft, the retention of grease on the shaft end face is improved, and the weight at the time of rotational balance correction is reduced. (5) Since the grease is always discharged outward, the discharge property of the universal joint due to centrifugal force is improved, and the lubricity of the bearing is improved.
There are various effects.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a universal joint according to the present invention.

FIG. 2 is a perspective view of the universal joint during assembly.

FIG. 3 is a partially cutaway view of the universal joint after assembly.

FIG. 4 is a longitudinal sectional view of a connection shaft of the universal joint.

FIG. 5 is an explanatory diagram of grease flow of the universal joint.

FIG. 6 is an exploded perspective view of a conventional universal joint.

FIG. 7 is an explanatory view for assembling the universal joint.

FIG. 8 is a diagram for explaining the flow of grease in the universal joint.

FIG. 9 is a partial cross-sectional view of a cross shaft of another conventional universal joint.

FIG. 10 is a longitudinal sectional view of a cross shaft body of still another conventional universal joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connecting shaft 3 Plane part 5 Shaft cylinder hole 6 Oil supply hole 7 Grease nipple 8 Shaft part 9 Bearing 10 Oil seal 11 Holding plate 12 Set screw 13 Yoke 14 Yoke 15A Fork 15B Fork 16A Shaft hole 16B Shaft hole 17 Stop screw hole G grease

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 3/38-3/43 F16D 3/26

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical body having flat portions parallel to mutually orthogonal positions on the outer peripheral surface of a cylindrical body, and bottomed shaft tube holes formed on the coaxial lines of the respective plane portions, and each shaft tube hole from the center. A lubrication hole is provided at the bottom of the shaft, and a connecting shaft having a grease nipple communicating with the lubrication hole is provided between the flat portions by a shaft portion inserted through the bearing and the oil seal into the shaft cylinder hole. A universal joint fixed to the yoke fork.