JPH0260890B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive shaft suitable for driving, attaching and detaching horizontal rolls.

Conventionally, as shown in Figs. 1 and 2, a roll drive shaft has a cross pin B and a fitting yoke A of the upper universal joint in the drive system, and a spline shaft is attached to the cross pin B of the upper universal joint and the fitting yoke A from the diameter of the spline shaft C. The spline yoke F is located above the cross pin B, and the fitting yoke A is located below the cross pin B. It is known that a spline shaft C is inserted through holes D and E, and the upper part of the spline shaft C is fitted into a spline hole G of a spline yoke F.

The drive shaft with the above structure is for a vertical roll, and a drive source such as a motor H drives a drive shaft installed parallel to the drive shaft via a drive gear I, and a spline shaft C. is inserted through the cross pin B and fitted into the spline yoke F, so the drive shaft disposed in the vertical direction is not subject to any restrictions regarding the space in the axial direction.

However, when this structure is applied to a normal rolling mill etc. where the drive shaft is horizontal, the drive shaft is placed in series between the drive source and the rolls,
Since the spline yoke is connected to the drive source, there is a disadvantage that the axial space between the drive source and the roll becomes large.

The present invention was made in view of such conventional problems, and even in a structure in which the drive shaft is arranged in series between the drive source and the horizontal roll, it is possible to reduce the torque transmission capacity at the spline fitting part. It is an object of the present invention to provide a drive shaft in which a horizontal roll can be easily attached and detached, and the sealing performance of a spline fitting part can be sufficiently ensured.

To explain the structure of the present invention based on an embodiment, a drive shaft 1 includes a spline yoke 4 connected to a driving side fitting yoke 2 via a first joint 3, and a driven side slip yoke 5.
A spline shaft 7 connected to the spline shaft 7 via a second joint 6 is fitted to be slidable in the axial direction. A through hole 9 through which the spline shaft 7 can be inserted is provided in the center of the cross pin 8 of the first joint 3, and an outer cover 10 and an inner cover 1 are provided on the outer periphery of the fitting portion between the spline shaft 7 and the spline yoke 4.
1 is slidably sealed and mounted, and within the covers 10 and 11 is a spline shaft 7.
A spring 12 is attached to bias the spline yoke 4 and the spline yoke 4. Two springs 12 may be provided on both sides of an annular partition plate 13 slidably fitted to the outer periphery of the spline yoke 4, or the annular partition plate 13 may be omitted and a single spring may be provided.

The covers 10 and 11 are sealed using a groove 16 formed on the inner surface of the annular seal cover 15 which is divided into two parts.
The seal body 14 filled with a seal member 17 such as felt is inserted into the annular tip portion 18 of the outer cover 10.
This is done by holding the seal body 14 with the presser lid 19 and sliding the inner circumferential surface of the seal body 14 and the outer circumferential surface of the inner cover 11 into sliding contact. A flange 20 that can engage with the side wall of the seal body 14 is integrally formed at the tip of the inner cover 11, and engages when the spline yoke 4 and the spline shaft 7 slide to separate the covers 10 and 11. To maintain sealing and to prevent the drive shaft 1 from elongating beyond a certain length.

Since this invention has the above-mentioned configuration, in order to attach and detach a horizontal roll of a rolling mill or the like to and from the slip yoke 5, if the yoke 5 is moved in the direction of the fitting yoke 2 against the biasing force of the spring 12, the bolts 21 ,2
2, the spline shaft 7 connected to the slip yoke 5 via the second joint 6 moves toward the fitting yoke 2 through the through hole 9 provided in the center of the cross pin 8 of the first joint 3. Therefore, even if the overall length of the drive shaft 1 is the same, the allowable sliding amount of the spline shaft 7 can be increased by the amount that allows the cross pin 8 to be inserted.

This means that when the overall length of the drive shaft 1 and the sliding length of the spline fitting part are the same as in the conventional case, the engagement length of the spline fitting part is made longer than in the conventional case to increase the torque transmission capacity. This means that when the sliding length and torque transmission capacity of the spline fitting portion are made the same as in the conventional case, the overall length of the drive shaft 1 can be made shorter than in the conventional case. Therefore, when using the drive shaft 1 with this structure in a place where horizontal shaft installation space is limited, the sliding length can be reduced by shortening the axial engagement length between the spline yoke 4 and the spline shaft 7. Since there is no need to increase the size, rolls of a rolling mill or the like can be easily attached and detached from the drive shaft 1 without reducing the torque transmission capacity at the spline fitting portion.

Further, the covers 10 and 11 are slidably sealed by the seal body 14, and the flange 20 formed at the tip of the inner cover 11 does not engage with the side wall of the seal body 14 and be separated. This prevents dust from entering the spline fitting part and maintains smooth sliding motion, and also prevents the slip yoke 5, which is moved toward the roll by the spring 12 acting on the spline shaft 7 when the roll is attached or detached, to the spline fitting part. The return position can be automatically returned to the optimal position where the flange 20 engages with the seal body 14.

As detailed above, according to the present invention, various excellent effects as listed below can be obtained.

(1) A spline yoke connected to a driving side fitting yoke via a first joint and a spline shaft connected to a driven side slip yoke via a second joint are slidably fitted. A through hole through which the spline shaft can be inserted is provided in the center of the cross pin of the first joint, a cover member is attached to the outer periphery of the fitting portion between the spline shaft and the spline yoke, and a Since a spring is provided to bias the spline shaft and the spline yoke in a direction away from each other, even in a horizontal rolling mill etc. where the drive shaft is arranged in series between the drive source and the horizontal roll. , the length of the drive shaft can be shortened without reducing the torque transmission capacity in the spline fitting portion, and the horizontal roll can be easily attached and detached.

(2) The cover member consists of an outer and an inner cover that are slidable relative to each other, and a seal body is interposed in the sliding portion of both covers, and the seal cover of the seal body is , is attached to the annular step at the tip of the outer cover, and the inner peripheral surface of the seal body is in sliding contact with the outer peripheral surface of the inner cover, so that the cover member can respond to the expansion and contraction movements of the drive shaft. While allowing expansion and contraction in the axial direction, it is possible to sufficiently ensure the sealing performance that is the original function of the cover member.

(3) The seal body is constructed by filling an inner groove of an annular seal cover with a seal member, and a flange provided at the tip of the inner cover is configured to engage with the seal cover of the seal body. As a result, not only can the outer cover and inner cover not be separated, but even if the flange of the inner cover is strongly engaged with the seal body when the drive shaft is extended,
All of this impact force will be borne by the seal cover.

Therefore, there is no risk of excessive force acting on the sealing member itself and impairing its sealing performance, and despite the combination with the above-mentioned non-separable structure,
The sealing performance, which is the original function of the seal body, can be fully exhibited.

(4) The seal cover of the seal body is fitted into the annular step at the distal end of the outer cover and is held by the presser cover to be integrated with the outer cover, while the flange that engages with the seal cover is Since these engaging parts are integrally provided at the tip of the inner cover, the strength of these engaging parts is sufficient and the sealing performance is also high, which is particularly effective for large drive shafts.

That is, when used as a drive shaft for a rolling mill, for example, the drive shaft itself becomes large, so the inertia when it slides is large, and the engagement portion between the outer cover and the inner cover also has a relatively large size. Although an axial load will be applied, the seal cover and flange part of the seal body that constitute this engaging part are integrated with the outer cover and inner cover, respectively, to ensure sufficient strength. Even when a large load as described above is applied, separation of the outer cover and inner cover is effectively prevented. Therefore, together with the excellent sealing performance of the seal body itself, sufficient sealing performance between both covers is ensured.

(5) Since the seal cover of the seal body has a two-piece structure, it is possible to assemble the seal cover even though the flange is integrally formed at the tip of the inner cover, making it easy to assemble the seal body. The attachment work can be done easily and quickly.

[Brief explanation of the drawing]

FIG. 1 is a front view of a half section of a conventional embodiment, FIG. 2 is an exploded perspective view of the same essential parts, and FIG. 3 is a front view of a section of the upper half of an embodiment of the present invention. FIG. 4 is a cross-sectional view of a main part showing details of the cover fitting portion P shown in FIG. 3, and FIG. 5 is a perspective view of the seal cover. 1... Drive shaft, 2... Fitting yoke, 3... First joint, 4... Spline yoke, 5... Slip yoke, 6... Second
Joint, 7...Spline shaft, 8...Cross pin, 9...Through hole, 10...Outer cover, 11
... Inner cover, 12 ... Spring, 14 ... Seal body, 15 ... Seal cover, 16 ... Concave groove, 17
... Seal member, 18 ... Tip annular step, 19 ...
...presser cover, 20...flange.

Claims (1)

[Scope of Claims] 1. A spline yoke connected to a driving side fitting yoke via a first joint and a spline shaft connected to a driven side slip yoke via a second joint are slidably fitted. In the combined drive shaft, a central portion of the cross pin of the first joint,
A through hole through which the spline shaft can be inserted is provided, a cover member is attached to the outer periphery of the fitting portion between the spline shaft and the spline yoke, and a cover member is provided in the cover member to separate the spline shaft and the spline yoke from each other. a spring biasing the cover member in the direction; the cover member includes outer and inner covers that are slidable relative to each other; and the covers are slidably sealed in sliding portions of the outer and inner covers. A sealing body is interposed, and the sealing body is formed by filling an inner groove of an annular seal cover with a two-part structure with a sealing member, and a sealing member of the sealing body is inserted into an annular step at the distal end of the outer cover. is fitted and held by a presser lid, the inner circumferential surface of the seal body is in sliding contact with the outer circumferential surface of the inner cover, and the tip of the inner cover is engaged with the seal cover of the seal body. A drive shaft characterized in that a flange is integrally provided and the outer cover and inner cover are not separated.