JPH0124929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricant supply device for a universal joint, and particularly to a device for supplying lubricant from one bendably connected member to the other member via the bent portion. .

In order to fully demonstrate the performance of the universal joint, it is important to supply lubricant such as grease to the spline fitting part of the shaft body (yoke) or the bearing part of the cross shaft. However, in the case of a universal joint for a rolling mill, there are cases where lubricant cannot be supplied due to reasons such as lack of space around the machine structure, or obstacles such as a cover placed close to the universal joint. There are many.

Conventionally, for this reason, grease, etc. was applied or sealed in the required parts only when assembling the universal joint, and thereafter it was often used without lubrication, which shortened its lifespan or caused it to be disassembled frequently. However, this requires a very troublesome process of refueling each time after assembly, and there are disadvantages such as a long downtime of the clutch drive, especially in rolling mills and the like.

This invention provides a method for installing a lubricant supply section at a location that is considerably distant from a receiving section that requires lubricant in a shaft body having a considerably long length, such as a universal joint for a rolling mill. The purpose of the universal joint is to provide the universal joint with the universal joint so as to enable regular supply of lubricant without the need for disassembly and reassembly, thereby maximizing the performance of the universal joint.

The present invention relates to a structure of a connecting portion of a lubricant supply path for supplying lubricant from one bendably connected member to a portion of the other member that requires lubricant, and in particular, a lubricant supply path on the lubricant supply side. A rotatable sphere is provided at both the opening on the connecting part side end surface of the supply passage provided in the member and the opening of the supply passage provided on the opposite side that receives lubricant, and the sphere is A connecting pipe is provided to connect the two openings so that lubricant can be supplied thereto, and a lubricant supply portion such as a grease cup is provided at an appropriate location on the supply side member.

The present invention will be described in detail below with reference to the illustrated embodiments.

FIG. 1 is a partial vertical cross-sectional view showing the main part of an example of a universal joint used as a drive shaft for a rolling mill, and FIG. 2 shows the main part in an enlarged manner. A is an obstacle such as a cover around the drive shaft. The universal joint 1 includes a pair of yokes 2 and 3, a cross shaft 4, and a bearing that is fixed to the end face of each yoke 2 and 3 and pivotally supports the trunnion shaft portion of the cross shaft 4 via a needle roller or the like. A shaft body that connects the yoke 2 with a coupling ring 6 that fits on the shaft of a rolling roll (not shown) by spline fitting to the yoke 2, and connects the yoke 3 with the yoke of another universal joint (not shown). Part 7 is attached by spline fitting 8.
That is, the drive shaft consists of a pair of universal joints that are connected to rotate together, a coupling that fits on the rolling rolls, a coupling that fits on the output shaft of the reducer, etc., and the yoke 3 and the shaft body. The spline fitting portion 8 serving as a connecting portion with the portion 7 allows the entire length of the drive shaft to be expanded and contracted in the axial direction.

The illustrated embodiment above shows a case where the spline fitting 8 is used as a receiving portion 10 that requires supply of lubricant, and the yoke 3 is the member on the receiving side. 9 is a cover for the spline fitting 8 portion.

11 is a grease nipple as a lubricant supply section provided at the center of the end face of the yoke 2 on the coupling ring 6 side, and is screwed into the end opening of a lubricant supply path 12 penetrating through the center of the yoke 2; An opening 13 with an enlarged diameter is provided at the end of the supply path 12 on the connecting portion side, that is, on the axial end surface of the yoke 2 on the connecting portion side.

The yoke 3 is provided with a feeding path 15 having an opening 14 facing the opening 13 across the cross axis 4 on the end surface of the connecting portion, and the other end is connected to the receiving portion 10.
Open nearby.

Ring-shaped concave spherical seats 16 and 17 whose inner diameter surfaces are concave spherical are fitted into both openings 13 and 14, respectively, and through holes 18 and 19 are connected to the supply path 12 and the feed path 15, respectively. , spheres 22 and 23 having large-diameter fitting holes 20 and 21 concentric with the holes 18 and 19;
one end of the tube body 24 is fitted and fixed in the fitting hole 20 of the sphere 22, and the fitting hole 2 of the sphere 23 is fitted in a rotatable manner.
One end of the tube body 25 is fitted and fixed to the tube 1.

The tube bodies 24 and 25 are inserted through a large-diameter through hole 26 provided through the center of the cross shaft 4, fitted to each other so as to be slidable in the axial direction, and their ends are sealed with an O-ring 27 or the like. A connecting pipe 28 is configured. That is, the supply path 12 and the feed path 15 are communicated through the connecting pipe 28 and the through holes 18 and 19 of the spheres 22 and 23 so that the lubricant can be supplied. A spring 29 is interposed between the spherical body 22 and the tube body 25, and each spherical body 22, 23 is pressed against the respective concave spherical seats 16, 17. 30 is an oil seal that seals between the openings 13, 14 and the spheres 22, 23, and 31 is a supply path for supplying lubricant to the bearing 32 of the trunnion shaft portion of the cross shaft 4.

As described above, when the coupling ring 6 is removed from the rolling roll shaft for roll replacement etc., lubricant such as grease can be supplied from the grease nipple 11 to the receiving part 10, that is, the spline fitting 8 part of the yoke 3. can. When the yoke 2 and the coupling ring 6 are connected by a method other than spline fitting, the grease nipple 11 is connected to the yoke 2.
It can be attached to a suitable location on the outer peripheral surface of the roll, and in this way, grease can be supplied at any time even when the roll is not replaced.

In FIG. 3, a grease nipple 11 as a lubricant supply part is provided on the outer circumferential surface 2a of the flange part of the yoke 2, and the connecting pipe 28 is composed of one pipe body, with both ends connected to needle roller bearings 33. through the spheres 22, 23
The springs 29 are fitted into the fitting holes 20 and 21 of the spherical bodies 20 and 21 so as to be slidable in the axial direction.

FIG. 4 shows how the connecting pipe 28 is connected to the fitting hole 20 of the sphere 22.
The other end is fitted to the sphere 23 via a needle roller bearing 33. In this case, the needle roller bearing 33 may be omitted.

Figure 5 shows the bearing part of the cross shaft 4 in the lubricant receiving part 1.
6 shows the details of the main part.

A lubricant supply section such as a grease reservoir 34 is provided at a suitable location on the shaft body portion 3A of the stub yoke 3, and a supply path 12,
Grease is to be supplied to the opening 13 via a supply pipe 35 or the like, and the cross shaft 4 is provided with a supply path 15 that passes through the trunnion shaft. And concave spherical seats 16, 17, spheres 22, 23, tube body 24,
25 is provided to feed grease from the feed path 15 to the inner bottom of the bearing case 5 to lubricate the bearing portion. Therefore, in this case, the through hole 19 of the sphere 23 is connected to the fitting hole 21.
It is perpendicularly perforated to the pipe body 25 to communicate with the pipe body 25. Further, the concave spherical seat 17 has a circumferential groove 36 corresponding to the through hole 19 around its inner diameter, and communicates with the feeding path 15 via a radial hole 37.

FIG. 7 is a diagram showing still another embodiment,
A communication portion between the supply path 12 and the feed path 15 is formed between the yoke 2 and the cross shaft 4, and its configuration is exactly the same as that in FIG. 3. Note that the receiving portion in this case is a trunnion bearing portion of the cross shaft 4. Therefore, the feeding path 15 is arranged perpendicular to the fitting hole 21.

This invention has the above configuration, and in a universal joint in which two members are bendably connected, it is possible to supply lubricant from one member to the other member, and the lubricant can be supplied from one member to the other member. Even if the required lubricant receiving part and its surroundings are surrounded by obstacles, the lubricant supply part can be installed at an appropriate location away from it, and the lubricant supply part can be replaced regularly or at any time. Grease, etc. can be supplied as needed, completely eliminating the inconvenience of having to stop the rolling mill drive for a long time to supply grease, and greatly extending the life of the universal joint. At the same time, its performance can be maximized.

[Brief explanation of drawings]

Fig. 1 is a front view showing a part of the embodiment in section, Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is a sectional view of another embodiment, and Fig. 4 shows yet another modification. 5 is a front view showing a part of another embodiment in cross section, FIG. 6 is an enlarged sectional view of the main part thereof, and FIG.
The figure is a sectional view of another embodiment. DESCRIPTION OF SYMBOLS 1... Universal joint, 2, 3... Yoke, 4... Cross shaft, 5... Bearing case, 10... Receiving part, 11... Grease cup, 12... Supply path, 1
3, 14...opening, 15...feeding path, 16, 17...
Concave spherical seat, 18, 19... Through hole, 20, 21... Fitting hole, 22, 23... Sphere, 24, 25... Tube body, 26
...Through hole, 28...Connection pipe, 29...Spring, 33...Needle roller bearing, 34...Grease reservoir, 35...Supply pipe.

Claims (1)

[Scope of Claims] 1. A lubricant supply part and a connecting part side axis of the member from the supply part to another member bendably connecting the member in which the receiving part that requires lubricant is formed. a supply path forming an opening in the direction end surface, and a feeding path having an opening opposite to the opening of the supply path and supplying lubricant to the receiving portion in the member on the receiving side. , a concave spherical seat is provided in each of the openings, and each concave spherical seat is provided with a through hole communicating with the supply path and the feeding path, and a fitting hole into which the end of the connecting pipe is fitted. Rotatably fit the sphere having the
The two spheres are connected by the connecting pipe whose ends fit into the fitting holes to communicate the supply path and the feeding path, and both spheres are pressed against their respective concave spherical seats through at least the connecting pipe. A lubricant supply device for a universal joint equipped with a spring member. 2. The connecting pipe is composed of two pipe bodies that slidably fit into each other, the end of one of the pipes is fitted and fixed into the fitting hole of one of the spheres, and the end of the other pipe is fixed by fitting into the fitting hole of one of the spheres. 2. The lubricant supply device for a universal joint according to claim 1, wherein the second sphere is fitted and fixed in the fitting hole of the other sphere. 3. The lubricant supply device for a universal joint according to claim 2, wherein a spring member is interposed between one tube and the other sphere. 4. The lubricant supply device for a universal joint according to claim 2, wherein a spring member is interposed between one tube and the other tube. 5 One end of the connecting tube is fitted and fixed into the fitting hole of one sphere, the other end is slidably fitted into the fitting hole of the other sphere, and a spring member is placed between the sphere and the connecting tube. A lubricant supply device for a universal joint according to claim 1, wherein the lubricant supply device is provided with a universal joint. 6. Claim 1, wherein both ends of the connecting pipe are slidably fitted into fitting holes of corresponding spheres, and a spring member is interposed between at least one end and the sphere into which it fits. Lubricant supply device for universal joints. 7 Lubricant supply in the universal joint according to claim 5 or 6, in which a bearing member such as a needle roller bearing is interposed between the end of the connecting pipe and the sphere into which it is slidably fitted. Device. 8. The lubricant supply device for a universal joint according to any one of claims 1 to 7, wherein the member on the supply side is a member constituting a yoke of the universal joint. 9. The lubricant supply device for a universal joint according to claim 8, wherein the lubricant supply portion is provided at the axial end of the yoke. 10. The lubricant supply device for a universal joint according to claim 8, wherein the lubricant supply portion is provided at an appropriate position on the axial circumference of the yoke. 11 The member on the receiving side is a member constituting the other yoke of the universal joint, and has a through hole in the center of the cross shaft with a diameter sufficiently larger than the connecting pipe diameter, and the connecting pipe is inserted through the through hole. A lubricant supply device for a universal joint according to any one of claims 1 to 10. 12. The lubricant supply device for a universal joint according to any one of claims 1 to 10, wherein the member on the receiving side is a cross shaft of the universal joint.