JP6236724B2 - Vertical transmission - Google Patents

Description

  The present invention relates to a vertical transmission in which an input shaft or an output shaft penetrates an enclosed oil receiving tank from below.

Conventionally, in transmissions, electric motors, and the like used for work machines and the like, in general, there are many horizontal arrangements in which a rotating shaft (input shaft or output shaft) penetrates from the outside in an enclosed case, An oil seal, a mechanical seal, a labyrinth seal, or the like is used as a seal structure that prevents the lubricating oil from leaking to the outside. (Patent Documents 1 and 2)
On the other hand, in some work machines, a vertical type with a rotating shaft penetrating in the vertical direction from the outside may be used in an enclosed case. Lubricating oil may leak from the bearing and seal part of the rotating shaft that has passed through.
In particular, in the fields of food machinery, pharmaceutical machinery and the like, there should be no lubricating oil leakage, and there are many requests for improvement of the vertical transmission to cope with lubricating oil leakage.

JP 2010-93932 A (FIG. 1) Japanese Patent Laying-Open No. 2001-1775 (FIG. 9)

According to Patent Document 1, in a horizontally disposed electric motor that penetrates a rotating shaft in a left-right direction in a fully closed case, lubricating oil is supplied to a bearing that supports the rotating shaft in the case, and A labyrinth seal is used to prevent the lubricating oil in the case from leaking outside.
However, the technique of Patent Document 1 presupposes a horizontal arrangement that penetrates the rotating shaft to the left and right. In the case of a vertical arrangement that penetrates the rotating shaft from below in an enclosed case, lubricating oil leaks out. There is a risk that.

  In view of the above-described circumstances, the present invention provides a vertical transmission in which an input shaft or an output shaft penetrates an enclosed oil receiving tank from below in a vertical direction in which lubricating oil does not leak out from the oil receiving tank. The purpose is to provide a type transmission.

The present invention solves the above problems by the following means.
(1) The vertical transmission of the first means is a vertical transmission in which an input shaft or an output shaft is penetrated from below in an enclosed oil receiving tank. And a cylinder with an appropriate gap between the outer diameter of the input shaft or the output shaft, the inner cylinder side of which is mounted downward, and the mounting portion is located outside the input shaft or the output shaft. Lubricating oil in the oil receiving tank is provided with a cap-shaped cover that is integral with the diameter portion and whose inner peripheral surface is arranged to cover the cylinder from above with a small gap from the outer cylinder side or the upper surface of the cylinder. The seal member is provided in the gap between the cap-shaped inner surface of the cover and the cylinder, the two seal members are formed of felt, and the seal member is disposed on the inner surface side of the cover. It is characterized by being respectively fitted in the groove | channel provided in two places .

(2) In the vertical transmission of the second means, in the vertical transmission of the first means, the attachment portion of the cover is integrated with the outer diameter portion of the input shaft or the output shaft by an interference fit. It is characterized by being configured.

(3) In the vertical transmission of the third means, in the vertical transmission of the first means, the attachment portion of the cover is integrated with the outer diameter portion of the input shaft or the output shaft with an adhesive. It is characterized by being configured.

(4) The vertical transmission of the fourth means is characterized in that, in the vertical transmission of the first means, the cover and the input shaft or the output shaft are configured as an integral structure. To do.

(5) The vertical transmission of the fifth means is the lubricating oil surface according to the vertical transmission of the first means, wherein the oil receiving tank also serves as an oil tank and the cylinder is stored in the oil tank. It is characterized by a configuration that protrudes further upward.

(6) The vertical transmission of the sixth means is a separate oil tank in which the lubricating oil dripped into the oil receiving tank is connected to the oil receiving tank by piping in the vertical transmission of the first means. It is characterized by being configured to be stored in

(7) The vertical transmission of the seventh means is the vertical transmission of the fifth and sixth means, which sucks up the lubricating oil stored in the oil tank, and is the upper part in the vertical transmission. A lubricating oil circulation pipe and a pump are provided so as to flow down from the pipe and supply to a lower machine part or the like.

(8) The vertical transmission of the eighth means is the vertical transmission of the first means, wherein the seal member is slightly in contact with the inner surface of the rotating cover or the outer cylinder side of the fixed cylinder. It is characterized in that it is configured so as not to contact at a large gap.

In the vertical transmission, the present invention according to claim 1 is attached to the lower surface of the oil receiving tank so as to protrude from the outside to the inside at an appropriate height, and the inner cylinder side of the input shaft or the output shaft is disposed downward. The cylinder having an appropriate gap with the outer diameter portion, and the mounting portion thereof are integrated with the outer diameter portion of the input shaft or the output shaft, and the inner peripheral surface of the cylinder is small with respect to the outer cylinder side or the upper surface of the cylinder. With the configuration in which the cap-shaped cover disposed so as to cover from above is provided, there is an effect that the lubricant that is supplied to the mechanical portion and the like in the vertical transmission and scatters does not leak to the outside. .
Further, by providing a seal member in the gap between the cap-shaped inner surface of the cover and the cylinder, there is an effect that leakage of the lubricating oil can be surely prevented.

  The present invention according to claims 2 to 4 is the vertical transmission according to claim 1, wherein the mounting portion of the cap-shaped cover is integrated with the outer diameter portion of the input shaft or the output shaft by an interference fit. Alternatively, the oil receiving tank doubles as an oil tank according to the present invention according to claim 5 or 6 or 7 so that the cover is integrated with the adhesive, or the cover and the rotary shaft are integrated. As a configuration in which the cylinder protrudes upward from the lubricating oil surface stored in the oil tank, or as a configuration in which the lubricating oil dripped into the oil receiving tank is stored in a separate oil tank connected to the oil receiving tank by piping, Even if lubricating oil circulation piping and a pump for sucking up the lubricating oil stored in the oil tank are provided and the lubricating oil flows down from the upper part of the vertical transmission and is supplied to the lower mechanical part, the lubricating oil that scatters That does not leak to the outside A.

According to the eighth aspect of the present invention, in the vertical transmission according to the first aspect , the felt sealing member provided in the gap between the cover and the cylinder is provided on the inner surface of the rotating cover or outside the fixed cylinder. By being configured not to contact the cylinder side with a slight gap, the sealing member does not generate heat even during high-speed operation of the input shaft or output shaft, and there is an effect that there is no heat loss.
In addition, when the input shaft or output shaft and the cover rotate at high speed, the lubricating oil adhering to the input shaft or output shaft and cover is blown away by the centrifugal force due to the high speed rotation. Even if there is a slight gap between the outer cylinder side, the lubricating oil does not leak.
In particular, when the felt is fitted in a groove provided on the inner peripheral side of the cover, the felt contacts and seals the outer diameter portion of the cylinder during low-speed rotation, and the felt fitted in the groove during rotation at high speed causes the centrifugal force of rotation. Due to the action, it is separated from the outer diameter portion of the cylinder, and it has the effect of avoiding heat generation and damage during high-speed rotation at the contact seal portion as in the case of a conventional oil seal or the like.

1 is a front sectional view of a vertical transmission according to a first embodiment of the present invention. FIG. 2 is an enlarged detail view of a part II in FIG. 1. It is front sectional drawing of the vertical transmission concerning the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

(First Embodiment of the Invention)
A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a front sectional view of a vertical transmission according to a first embodiment of the present invention.
FIG. 2 is an enlarged detailed view of a portion II in FIG.
In FIG. 1, the vertical transmission 1 in which the output shaft 5 is penetrated from below in an oil receiving tank 10 attached integrally with the case 22 has an input shaft penetrated from above the case 22 via a seal member 22S. 15 is supported by a pair of bearings B3 provided via a spacer 16 and rotates, via a plurality of shafts 17 attached to the disk portion 15B of the input shaft 15 equally in the circumference. Thus, the plurality of planetary rollers 18 supported by the bearings 19 revolve around the center of the output shaft 5, and the surface 22AS of the frame 22A of the case 22 and the surface 5S of the output shaft 5 are appropriately set as tight rolling surfaces. By rotating, the output shaft 5 is configured to rotate at a higher speed by the frictional force with the planetary roller 18.

The output shaft 5 includes a pair of bearings provided via a spacer 24 on a bearing B2 provided on the disk portion 15B of the input shaft 15 and a bearing holder 23 attached to a frame 21 integral with the case 22. It is supported and rotated by B1.
Further, the output shaft 5 is disposed with an appropriate gap from the inner cylinder side of the cylinder 6 which is mounted in a projecting manner from the lower surface of the oil receiving tank 10, and its mounting portion is located outside the output shaft 5. A shade-shaped cover 7 integrally attached to the diameter portion by an interference fit is disposed so as to cover the cylinder 6 from above.

  Here, the oil receiving tank 10 also has a function as an oil tank, and the lubricating oil L stored in the oil receiving tank 10 is provided in the pipe 11, the hole 21 </ b> H opened in the frame 21, the pipe 12, and the case 22. In the vicinity of each of the bearings, the planetary roller 18 and the like by a pump 13 provided in the middle of the pipe 12 through a hole 22H opened in the hole 16, a hole 16H opened in the spacer 16, or a hole 15H opened in the input shaft 15. These parts are lubricated to be supplied to the machine part, and further, the lubricating oil L that has flowed down flows into the oil receiving tank 10 from the hole 21D or the like opened in the frame 21, and is stored in the figure. It circulates like an arrow.

  The head of the cylinder 6 is disposed above the lubricating oil surface in the oil receiving tank 10 at an appropriate height, and the cover 7 is provided with a groove 7G on the inner surface side as shown in FIG. (2 places in FIG. 2), a felt 8 is fitted into the groove 7G so that a gap between the cylinder 6 and the outer cylinder portion is sealed.

Next, the operation of the vertical transmission 1 according to the first embodiment of the present invention will be described.
In the vertical transmission 1, the lubricating oil L is circulated by the pump 13 through an oil receiving tank (oil tank) 10, a pipe 11, a hole 21H, a pipe 12, a hole 22H, a hole 16H, a hole 15H, and the like. The machine part is lubricated.
At this time, when the mechanical part rotates at a high speed, the lubricating oil L is scattered and the lubricating oil L stored in the oil receiving tank 10 undulates. Since the cover 7 is disposed so as to cover the cylinder 6 from above, the lubricating oil L does not leak from the oil receiving tank 10.
Further, when the gap between the inner surface side of the cover 7 and the outer cylinder portion of the cylinder 6 is sealed by the felt 8 that is a sealing member, the lubricating oil L does not leak out from the oil receiving tank 10 reliably. In particular, when the output shaft 5 rotates at a low speed, the felt 8 contacts and seals the outer cylinder side of the cylinder 6, so that the lubricating oil L can be reliably prevented from leaking from the oil receiving tank 10.

Further, the vertical transmission 1 according to the first embodiment of the present invention has a function as a speed increaser by the action of the planetary roller 18, and the output shaft 5 rotates at a high speed (for example, 20,000 rpm). In this case, the cover 7 that rotates integrally with the output shaft 5 also rotates at a high speed, and the felt 8 moves in the direction of the outer diameter side of the groove 7G of the cover 7 by the action of centrifugal force due to the high speed rotation of the cover 7 (see FIG. 2). By approaching (in the direction of 8A in the figure), a slight gap is generated between the felt 8 and the outer cylinder side of the cylinder 6.
Due to this gap, the outer cylinder portion of the cylinder 6 does not come into contact with the felt 8, so that high-speed rotation contact between the cylinder 6 and the felt 8 is avoided and heat generation is avoided.
In particular, an oil seal or the like is generally used for the lubricating oil seal member, but when the oil seal or the like rotates in contact with a fixed cylinder during high-speed rotation, the oil seal generates heat in a short time. Etc., and the contact portion of the outer cylinder portion of the cylinder may be worn away, so that the formation of the gap during high-speed rotation by fitting the felt 8 into the groove 7G is effective. .
When the output shaft 5 and the cover 7 are rotated at a high speed, the lubricating oil L adhering to the output shaft 5 and the cover 7 is also blown away by the centrifugal force due to the high-speed rotation. Even if there is a slight gap between the sides, the lubricating oil L does not leak out.

  In the figure and the description, the case where the attachment portion of the cover 7 is integrated with the outer diameter portion of the output shaft 5 by an interference fit is shown, but the attachment portion of the cover 7 is attached to the outer diameter portion of the output shaft 5 with an adhesive. The cover 7 and the output shaft 5 may be an integral structure. In either case, the cover 7 may be attached to the outside of the output shaft 5. Since the diameter portion is integral, there is no gap, so the scattered lubricating oil L does not leak from here.

Moreover, although the said figure and description demonstrated the case where the oil receiving tank 10 in which the output shaft 5 was enclosed penetrated from the downward direction, the case where an input shaft penetrates from the downward direction is also the category of this invention.
Furthermore, in the above description, the case where the seal member is provided in the gap between the cap-shaped inner surface side of the cover 7 and the outer tube portion of the tube 6 has been described with reference to FIG. The sealing member may be provided in the gap between the top surface of the cover 7 and the above-described drawings and description describe the case where the felt 8 is fitted into the groove 7G provided on the inner surface side of the cover 7. It is also possible to fit in a groove (not shown) provided on the outer cylinder side of the cylinder 6, and in any case, a gap due to the high speed rotation does not occur, but the function at the low speed rotation is similar to the above description. Therefore, detailed description is omitted.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a front sectional view of a vertical transmission according to the second embodiment of the present invention.
In FIG. 3, the same structure as that in FIG.
In FIG. 3, the vertical transmission 2 according to the second exemplary embodiment of the present invention is configured so that the lubricating oil L received by the oil receiving tank 10 passes through the connection pipe 31 near the bottom of the oil receiving tank 10. The lubricating oil L stored in the separate oil tank 30 and pumped in the oil tank 30 is configured to be pumped from the pipe 32 to the hole 22H of the case 22 by the pump 13.

Next, the operation of the vertical transmission 2 according to the second embodiment of the present invention will be described.
By providing the oil tank 30 separately, maintenance such as inspection of the oil level, inspection of the degree of deterioration, and replacement of the lubricating oil L is facilitated.

1, 2 Vertical transmission 5 Output shaft 6 Tube 7 (Shape-shaped) cover 7G (Groove inner surface side) Groove 8 Felt (seal member)
DESCRIPTION OF SYMBOLS 10 Oil receiving tanks 11 and 12 Piping 13 Pump 15 Input shaft 17 Shaft 18 Planetary roller 5S, 22AS Rolling surface 30 (of planetary roller) Oil tank 32 Piping L Lubricating oil

Claims (8)

In a vertical transmission with an input shaft or output shaft penetrating from below into an enclosed oil receiving tank, it is attached to the bottom surface of the oil receiving tank so as to protrude from the outside to the inside at an appropriate height. The cylinder side has a cylinder with an appropriate gap with the outer diameter part of the input shaft or the output shaft arranged downward, and its mounting part is integrated with the outer diameter part of the input shaft or the output shaft, and the inner peripheral surface of the cylinder is Provided with a cap-shaped cover arranged to cover the cylinder from above with a small gap from the outer cylinder side or upper surface ,
A seal member is provided in a gap between the cap-shaped inner surface of the cover and the cylinder,
A vertical transmission characterized in that the two seal members are made of felt, and the seal members are respectively fitted in grooves provided at two locations on the inner surface side of the cover .   2. The vertical transmission according to claim 1, wherein the mounting portion of the cover is configured to be integrated with an outer diameter portion of the input shaft or the output shaft by an interference fit.   2. The vertical transmission according to claim 1, wherein an attachment portion of the cover is integrated with an outer diameter portion of the input shaft or the output shaft with an adhesive.   2. The vertical transmission according to claim 1, wherein the cover and the input shaft or the output shaft are configured as an integral structure.   The vertical transmission according to any one of claims 1 to 4, wherein the oil receiving tank also serves as an oil tank, and the cylinder protrudes above a lubricating oil surface stored in the oil tank; A vertical transmission characterized by that.   The vertical transmission according to any one of claims 1 to 4, wherein the lubricating oil dripped in the oil receiving tank is stored in a separate oil tank connected to the oil receiving tank by piping. Vertical transmission characterized by.   The vertical transmission according to claim 5 or 6, wherein the lubricating oil accumulated in the oil tank is sucked up, and flows down from the upper part of the vertical transmission to be supplied to a lower mechanical part or the like. A vertical transmission comprising an oil circulation pipe and a pump. 2. The vertical transmission according to claim 1 , wherein the seal member is configured not to contact the inner surface of the rotating cover or the outer cylinder side of the fixed cylinder with a slight gap. Vertical transmission.

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