JP2007285392A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent lubrication failure, when operating a roller table, by using a conventional oil bathtub, without separately arranging a bearing part of a bevel gear in the oil bathtub. <P>SOLUTION: This power transmission device 11 synchronously rotates a plurality of table rollers 1 arranged in parallel. The oil bathtub 4 storing lubricating oil 8 is provided with a driven side bevel gear 3a respectively installed in one end part of the table rollers 1, a freely rotatable line shaft 5 attached with a driving side bevel gear 3b meshing with the driven side bevel gear 3a, and a speed reduction gear train 7 transmitting motive power from a motor 6 to the line shaft 5. The line shaft 5 is attached with at least one swirl vane 12 for generating a flow of the lubricating oil 8 in the opposite direction of a flow of the lubricating oil 8 by rotation of the driven side bevel gear 3a. The carrying upstream side and the downstream side of the oil bathtub 4 are connected by a communicating tube 13. When operating the roller table, a difference in the oil level height of the lubricating oil by rotation of the driven side bevel gear reduces, and lubrication of the gear is improved, and damage is hardly caused by the lubrication failure of the gear. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power transmission device for synchronously driving, for example, a plurality of table rollers for conveying steel pieces by means of a line shaft and a bevel gear.

  For example, an example of a power transmission device in a facility of a roller table that conveys a steel piece and that drives a plurality of table rollers in synchronization will be described with reference to FIG.

  Reference numeral 1 denotes a plurality of table rollers arranged in parallel in the conveying direction of the steel slab 2. A driven shaft bevel gear 3a is attached to one end of the table roller 1, and a drive shaft bevel gear 3b meshing with the driven bevel gear 3a is supported by the oil tub 4 so as to be freely rotatable. 5 is attached.

  A reduction gear train 7 is interposed between the line shaft 5 and the main shaft 6 a of the motor 6, and the driving force of the motor 6 is increased and transmitted to both the bevel gears 3 b and 3 a via the line shaft 5. The table roller 1 is rotated in synchronization, and the steel piece 2 placed on the table roller 1 is conveyed.

  In such an installation, when the roller table is stopped, a part of the bevel gears 3a and 3b is all lubricated in the oil bath 4 regardless of the upstream side or the downstream side as shown in FIG. It is in a state immersed in oil 8.

  However, when the roller table is operated and the bevel gears 3a and 3b are rotated, the lubricating oil 8 is opposite to the conveying direction of the steel piece 2 indicated by the arrow in FIG. 5 by the teeth of the driven bevel gear 3a attached to the table roller 1. As shown in FIG. 5, the oil level height L1 on the downstream side (right side of the paper) is lower than the oil level height L2 on the upstream side (left side of the paper).

  As a result, when the driven bevel gear 3a on the downstream side of the conveyance is not immersed in the lubricating oil 8, the driven bevel gear 3a meshing with the driven bevel gear 3a becomes poorly lubricated, and the bevel gears 3a, 3b Tooth surface damage is likely to occur. Further, when the reduction gear train 7 is installed on the downstream side of conveyance as shown in FIG. 3, the reduction gear is poorly lubricated, and the tooth surface of the reduction gear is likely to be damaged.

Therefore, for the purpose of solving the above problem, a bevel gear that meshes with a drive-side bevel gear attached to a line shaft is installed on the opposite side of the table roller so that the lubricating oil is scraped back in the conveying direction. An apparatus is disclosed in US Pat.
Japanese Patent Laid-Open No. 11-344198

  However, the lubricating device disclosed in Patent Document 1 further includes a bevel gear for scraping the lubricating oil back in the conveying direction on the side opposite to the table roller, so that a bearing portion that rotatably supports the bevel gear is provided. There is a problem that it is necessary to separately install in the oil tub, and that an installation space for the bevel gear is required in the oil tub.

  The problem to be solved by the present invention is that, in a power transmission device that synchronously drives a plurality of table rollers, a conventional method in which a bevel gear is separately installed in an oil bath in order to prevent poor lubrication of the gear when the roller table is operating. It is necessary to provide a bearing portion for the bevel gear in the oil tub, and a large oil tub is required.

The power transmission device of the present invention is
In order to prevent poor lubrication when operating a roller table using a conventional oil tub without providing a bearing portion for the bevel gear separately in the oil tub,
In an apparatus for transmitting power from a drive source to rotate a plurality of table rollers arranged in parallel in a synchronized manner,
In an oil tub that contains lubricating oil,
A driven bevel gear attached to one end of each of the plurality of table rollers;
A rotatable line shaft with a driving bevel gear meshing with these driven bevel gears,
A gear train that transmits power from the drive source is installed on this line shaft.
The main feature of the line shaft is that at least one swirl vane that generates a flow of lubricating oil in a direction opposite to the flow of lubricating oil caused by the rotation of the driven bevel gear is attached to the line shaft.

  In the power transmission device according to the present invention, when the conveyance upstream side and the conveyance downstream side of the oil tub are connected by the communication pipe, the effect of preventing the lubrication failure when the roller table is operating can be further improved.

  According to the present invention, the difference in the oil level of the lubricating oil caused by the rotation of the driven bevel gear can be effectively reduced during the operation of the roller table in the equipment for synchronously driving a plurality of table rollers. Thus, damage due to poor lubrication of the gear is less likely to occur.

Hereinafter, the best mode as well as one mode for carrying out the present invention will be described in detail with reference to FIGS.
FIG. 1 is an explanatory view showing an example of the power transmission device of the present invention in equipment for synchronously driving a plurality of table rollers.

  In FIG. 1, 11 is a power transmission device of the present invention, which has the following configuration. The same parts as those of the conventional power transmission device described with reference to FIG.

  Reference numeral 12 denotes a swirl vane attached to the line shaft 5, and this swirl vane 12 causes the teeth of the driven bevel gear 3 a attached to the table roller 1 to oppose the conveying direction of the steel slab 2 during operation of the roller table. The lubricating oil 8 that is about to be scraped off is scraped back in the transport direction.

  Therefore, as long as this swirl | wing blade 12 can be installed in the conventional oil tub 4 as shown in FIG. 1 and has the said effect | action, the shape, a magnitude | size, etc. will not ask | require. For example, the shape is not limited to the propeller shape of the ship shown in FIG. 1, but may be a fan blade shape.

  Moreover, if the scraping action of the lubricating oil 8 can be obtained, the swirl blades 12 do not necessarily have to be installed in correspondence with the bevel gears 3a and 3b that rotationally drive all the table rollers 1. As shown in FIG. 1, the installation of the swirl blades can be omitted for the table rollers around the drive source having no space.

  Further, as shown in FIG. 2, in addition to the configuration of FIG. 1, the conveyance upstream side and the conveyance downstream side of the oil tub 4 are connected by the communication pipe 13, and the conveyance in which the oil level becomes high during operation of the roller table The lubricating oil 8 may flow from the upstream side to the conveyance downstream side where the oil level becomes lower.

  In these power transmission devices 11 according to the present invention, during the operation of the roller table, the lubricating oil which is to be scraped to the opposite side to the conveying direction of the steel piece 2 by the teeth of the driven bevel gear 3a attached to the table roller 1 8 is scraped back in the conveying direction by the swirl vane 12.

  Therefore, the fluctuation of the oil surface height of the lubricating oil 8 during the operation of the roller table can be effectively suppressed, the gears are well lubricated, and damage due to poor lubrication of the gears hardly occurs. In addition to this, when the communication pipe 13 is provided as shown in FIG. 2, the oil level height fluctuation suppressing effect is further improved.

  Moreover, in the power transmission device 11 of the present invention, since the swirl vane 12 is attached to the line shaft 5, the conventional oil tub 4 can be used as it is.

  The present invention is not limited to the above example, and the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  The power transmission device of the present invention is not limited to the above-described steel slab conveying roller table, and can be applied to a power transmission device of any facility as long as it has the same problem of oil bath lubrication.

It is a top view which shows an example of the power transmission device of this invention in the installation which drives a some table roller synchronously. It is a top view which shows the best form of the power transmission device of this invention in the installation which drives a several table roller synchronously. It is explanatory drawing which shows the conventional power transmission device in the installation which drives a several table roller synchronously, (a) is a side view, (b) is a top view. It is explanatory drawing which shows the oil bath lubrication state of a driven side bevel gear in case the table roller is stopped, and is a view in which the drive side bevel gear attached to the line shaft is omitted from the view AA in FIG. is there. It is explanatory drawing similar to FIG. 4 which shows the oil bath lubrication state of the driven bevel gear in case the table roller is operating.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Table roller 2 Steel piece 3a Driven side bevel gear 3b Drive side bevel gear 4 Oil bath 5 Line shaft 6 Motor 7 Reduction gear train 8 Lubricating oil 11 Power transmission device 12 Swirling blade 13 Communication pipe

Claims (2)

In an apparatus for transmitting power from a drive source to rotate a plurality of table rollers arranged in parallel in a synchronized manner,
In an oil tub that contains lubricating oil,
A driven bevel gear attached to one end of each of the plurality of table rollers;
A rotatable line shaft with a driving bevel gear meshing with these driven bevel gears,
A gear train that transmits power from the drive source is installed on this line shaft.
In addition, the power transmission device is characterized in that at least one swirl blade is attached to the line shaft for generating a lubricating oil flow in a direction opposite to the lubricating oil flow caused by the rotation of the driven bevel gear. The power transmission device according to claim 1,
A power transmission device, characterized in that a transport upstream side and a transport downstream side of an oil tub are connected by a communication pipe.

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