JP2644453B2 - Lubrication device for sliding shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vertical
Between the sliding shaft and the bearing that guides it.
It relates to a lubricating device.

[0002]

BACKGROUND OF THE INVENTION Problems to be Solved by the Invention
The lubricating device between the bearing, generally engraved lubrication grooves in spiral or the like to the inner circumferential surface of the bearing, the lubricating groove bearing
Or to supply oil at a natural dripping from the oil cup attached to only, or, so that push the grease lubrication groove in grease pump.

However, lubrication using these oil cups and grease pumps has a problem that the lubrication function is low because only a very small amount of oil or grease can be supplied to the contact surface between the shaft and the bearing. was there. Especially in lubrication using grease, it is difficult to spread the grease over the entire contact surface between the shaft and the bearing due to the high viscosity of the grease. A large number of scratches are formed on the outer peripheral surface and the inner peripheral surface of the bearing , and the life of the shaft and the bearing is short.

An object of the present invention is to provide a lubricating device capable of supplying a sufficient amount of lubricating oil to a contact portion between a shaft and a bearing to perform smooth lubrication and to significantly reduce the work of lubrication work. It is the purpose.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve this object
In the present invention, a shaft extending in a substantially vertical direction is slid by a bearing.
Lubrication between the shaft and the bearing when guiding freely
As a device, "The shaft extends all around the upper end of the bearing.
An oil bath for immersion, and an oil shield at the lower end of the bearing.
And the upper and lower ends of the inner peripheral surface of the bearing are provided.
An annular recess with a diameter larger than the outer diameter of the shaft is formed in the middle between
Oil on the inner circumferential surface of the bearing
A portion above the tank is formed as a first sliding contact portion, and an annular concave portion is formed.
The lower part opposite to the oil tank across the place
The lower end of the first sliding contact portion near the annular recess and the front
Between the oil tank and the annular recess of the second sliding contact portion.
Oil passage between the lower end on the opposite side and the annular recess
Communication ".

In the present invention, the term "oil seal" refers to a shaft sealing means for preventing oil leakage.

[0007]

In this configuration, the shaft slides.
When the lubricating oil in the oil tank is attached to the shaft transferred to the inner peripheral surface of the bearing, thereby lubricating oil film is formed between the outer peripheral surface and the shaft receiving the inner peripheral surface of the shaft is carried out. In this case, since the oil tank is provided so as to surround the entire circumference of the shaft, the shaft is immersed in the lubricating oil in the oil tank over the entire circumference, so that the oil film covers the entire contact area between the shaft and the bearing. Can be formed uniformly, so that the lubrication function can be remarkably improved and the life of the shaft and the bearing can be remarkably improved.

In addition, since the oil tank is provided at the upper end of the bearing, it is possible to lubricate the oil tank with extreme ease, and to store a large amount of lubricating oil in the oil tank. Therefore, there is no need to lubricate for a long period of time, so that the time and effort of lubrication work can be significantly reduced. Also, do shafts and bearings extend in a substantially vertical direction?
Therefore, the oil in the oil tank does not spill.

By the way, although the provision of the oil seal at the lower end of the bearing can be reduced consumption of lubricating oil, on the other hand, the shaft
Since the oil film between the inner peripheral surface of the receiver and the outer peripheral surface of the shaft is sealed, positive pressure and negative pressure act on the oil film alternately when the shaft is reciprocally slid. The resistance to sliding increases and the movement becomes heavy. In contrast, the present application
The invention, since the lower end of the inner peripheral surface of the bearing and the oil tank are communicated through the oil passage and the annular recess, when the sliding of the shaft, the oil tank oil film through the oil passage and an annular recess relief or, conversely, the lubricating oil in the oil tank is supposed to be or is pulled into the inner circumferential surface of the bearing, greatly reduces that acts positive pressure and negative pressure in the oil film between the bearing and the shaft be able to.

Therefore, the shaft can be slid extremely smoothly without increasing the consumption of lubricating oil. Furthermore, the book
In the present invention, the lubricating oil is accumulated in the annular recess formed on the inner periphery of the bearing , and the shaft is immersed in the lubricating oil accumulated in the annular recess over the entire periphery, so that the lubricating effect can be further improved. . Further, since the oil passages communicate between the first sliding contact portion and the oil tank and between the second sliding contact portion and the annular recess, lubrication between the bearing and the shaft during sliding of the shaft is achieved. The generation of a positive pressure or a negative pressure in the oil can be further reduced.

As described above, the lubrication effect can be further improved, and the generation of positive pressure or negative pressure in the lubricating oil between the bearing and the shaft during sliding of the shaft can be significantly reduced. Ru can make a sliding of the shaft more smoothly.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 8).
It will be described based on. 1 to 7 show a first embodiment applied to a stoppering machine 1 for caulking a lid B made of a metal plate to the mouth of a wide-mouthed container A for packaging sake or the like. The machine 1 is provided with a table-shaped machine frame 2.
A hollow elevating shaft 4 as an example of a sliding shaft is slidably mounted vertically and undetachably on a bearing 3 provided at a lower end of the elevating shaft 4 and a tapping head 5 is attached to a lower end of the elevating shaft 4. In addition, 1
A number of elevating shafts 4 are attached to one machine frame 2.

A large number of claws (not shown) for caulking the cylindrical portion B1 of the lid B in the wide-mouthed container A are annularly disposed inside the stopper head 5. With the covered wide-mouthed container A positioned below the elevating shaft 4, the elevating shaft 4
Is lowered by appropriate means, and the claw moves radially inward while the lid B is pressed against the upper surface of the wide-mouthed container A by the stoppering machine 1, whereby the cylindrical portion B1 of the lid B is moved to the position shown in FIG. ) Is folded from the state shown in FIG. 1C to the state shown in FIG.

Next, the bearing 3 will be described with reference to FIGS. The holes of the bearing 3 has a cylindrical liner 6 is disabled and missing incapable fitted rotation, the first bushing 7 and fitted to the upper sandwiching the intermediate portion of the inner peripheral surface of the liner 6, This portion of the first bush 7 is formed with the first sliding contact portion 9.
Then, on the inner peripheral surface of the liner 6,
The second bush 9 is fitted to the second bush 9 to constitute the second sliding contact portion 10 . Further, by the child set larger than the outside diameter of the inner diameter of the portion of the elevator shaft 4 between the bushes 7, 8 of the liner 6, a portion between the bushes 7 and 8, the elevator shaft 4 An annular recess 11 is formed so that a gap is formed between the annular recess 11 and the outer peripheral surface.

The liner 6 projects slightly upward and downward of the machine frame 2. The oil seal 12 is fitted to the downwardly projecting portion of the liner 6, and the oil seal 12 is fitted to the upwardly projecting shaft 4 at the upwardly projecting portion of the liner 6. The oil tank 13 having a rectangular shape in a plan view is detachably fitted and mounted.
The lubricating oil 14 is stored in an annular oil pool formed in the area surrounded by. Needless to say, the oil tank 13 may have another shape such as a circular shape in a plan view.

An O-ring 15 for sealing is mounted on an outer peripheral surface of a part of the liner 6 which projects upward from the upwardly protruding part of the liner 6. A snap ring 16 is fitted on the upper end of the liner 6. On the outer peripheral surface of the first bush 7, a plurality of grooves 17 extending over the entire vertical direction are provided at appropriate intervals along the circumferential direction as an example of an oil passage.
And, also, to the lower end of the first bushing 7 annular recess 11
A notch 18 is formed to communicate with the notch 18. The groove 17 of the first bush 7 communicates with the oil tank 13.

The outer periphery of the second bush 8 is also covered with oil.
As a passage, it has several double engraved at appropriate intervals grooves 17 extending over the top under the entire length in the circumferential direction and the second
Notches 18 communicating with the grooves 17 are formed at both upper and lower ends of the bush 8. Note that an annular gap may be formed between the lower end of the second bush 8 and the oil seal 12. Further, the groove 17 and the notch 18 may be formed on the inner peripheral surface of the liner 6.

In the above construction, an oil film is formed between the elevating shaft 4 and the two sliding contact portions 9 and 10 by the lubricating oil 14 from the oil tank 13, and the oil film is formed between the elevating shaft 4 and the two sliding contact portions 9 and 10. , 10 are lubricated. In this case, the lubricating oil 1 in the oil tank 13
4 and the annular recess 11 is filled with the lubricating oil 14, so that the lifting shaft 4
Since a sufficient amount of lubricating oil is supplied to the entire surface of the contact portion between the sliding contact portions 9 and 10, the life of the lifting shaft 4 and the bearing 3 can be significantly improved.

Since the oil tank 13 is provided at the upper end of the bearing 3, lubrication to the oil tank 13 can be performed extremely easily, and a large amount of lubricating oil 1 is contained in the oil tank 13.
4 can be stored, so that there is no need to lubricate for a long period of time. Furthermore,
Since the oil seal 12 is provided at the lower end of the bearing 3, consumption of the lubricating oil 14 can be suppressed. In this case, both bushes 9,
When the groove 17 is not provided in the lifting shaft 10, a positive pressure acts on the oil film between the lifting shaft 4 and the sliding portions 9 and 10 and the lubricating oil 14 in the annular recess 11 when the lifting shaft 4 is lowered. However, a negative pressure acts when the lifting shaft 4 is raised, and the vertical movement of the lifting shaft 4 becomes heavy.

[0020] In the present application devised contrast, Ri by to engraved grooves 17 on the outer circumferential surfaces of the bushes 7 and 8, the fitting surface between the two bushings <br/> Gerhard 7,8 and the liner 6 A hole is formed
Since that, during the descent of the elevator shaft 4, as indicated by solid line arrow in FIG. 7, the lubricating oil between the bearing 3 and the elevator shaft 4 escapes upward from the groove 17, when elevated elevator shaft 4 in the opposite Is
Since the lubricating oil escapes downward as indicated by the dotted arrow in the figure and the lubricating oil circulates when the elevating shaft 4 moves up and down, the lubricating oil is circulated when the elevating shaft 4 and the sliding contact portions 9 and 10 are in contact with each other. The resistance between them can be significantly reduced.

The bearing oil tank 13 as described above in Example
When the oil tank 13 is detachably attached to the bracket 3, the size of the oil tank 13 can be freely set, and the bearing 3 can be easily machined. When the oil tank 13 is attached via an annular soft elastic body such as the O-ring 15,
There is an advantage that the oil tank 13 can be easily attached and detached without causing oil leakage.

The form of the oil passage is not limited to forming the groove 17 in the bushes 7 and 8 as in the above embodiment.
And a hose or a pipe as shown by a dashed line 19 in FIG. 7, or a bearing 3 as shown in FIG.
Hole 17 'may be formed in the liner 6 or the like by drilling.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a diagram schematically showing a wide-mouthed container stoppering machine to which the present invention is applied, FIG. 1 (b) is a partial end view showing a state where a lid is put on the wide-mouthed container, and FIG. It is a fragmentary sectional view in the state where a lid was fixed by caulking.

FIG. 2 is a sectional view of a bearing of an elevating shaft in the stopper for a wide-mouthed container.

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

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a perspective view showing a mounting state of a bearing metal.

FIG. 7 is a diagram showing an operation of an oil passage.

FIG. 8 is a diagram showing another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tapping machine to which this invention is applied 2 Machine frame 3 Bearing 4 Elevating shaft 5 Tapping head 6 Liner 7, 8 Bush 9, 10 Sliding contact part 11 Annular recess 12 Oil seal 13 Oil tank 14 Lubricating oil 17 Oil passage Groove as an example

Claims (1)

(57) [Claims] A shaft extending in a substantially vertical direction is slid by a bearing.
Lubrication between the shaft and the bearing when guiding freely
An apparatus in which a shaft is immersed all around the upper end of the bearing.
Oil tank at the lower end of the bearing.
In the middle part between the upper end and the lower end of the inner peripheral surface of the bearing,
Forming an annular recess having a diameter larger than the outer diameter of the shaft,
Of the inner peripheral surface of the oil tank
The part is formed as the first sliding contact part, and
The lower part on the opposite side to the metal tank forms a second sliding contact part,
1 The sliding contact between the lower end near the annular recess and the oil tank
And the lower end of the second sliding contact portion opposite to the annular recess.
A lubricating device for a sliding shaft, wherein the lubricating device communicates with an annular recess through oil passages .