JP2012137132A - Gear oil lubrication structure of two-shaft rotating mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear oil lubrication structure of a two-shaft rotating mechanism, having an excellent oil circulatory function and a rational form that is easier to manufacture.SOLUTION: In a two shaft vertical structure with two rotating shafts 21, 22 arranged therein vertically, a bulkhead section 12 is equipped which is provided so that driving force will be transmitted between the two shafts by a pair of gears 23, 24, and is provided with upper and lower bearing housing parts 13a, 13b and constitutes a part of a casing 11 of a gear box 10, the upper and lower bearing housing parts 13a, 13b are provided over tube wall parts 12a, 12b each protruded in a tubular shape from a wall surface 12c of the bulkhead section 12 into the gear box 10, groove-shaped oil flow paths 14a, 14b with a depth capable of supplying oil to an oil seal 18 is formed above the tube wall parts 12a, 12b, and groove-shaped oil flow paths 15a, 15b with a depth capable of discharging oil from the oil seal 18 are formed below the tube wall parts 12a, 12b.

Description

  The present invention is a biaxial vertical structure in which two rotating shafts that are supported so as to extend horizontally are arranged up and down, and a driving force is transmitted between the two shafts by a pair of gears arranged in a gear box. The present invention relates to a gear oil lubrication structure of a biaxial rotation mechanism provided in the motor.

  Conventionally, in a general biaxial rotating mechanism, oil lubrication is performed in a gear box with respect to a pair of meshed gears. At the same time, since the oil seal is disposed together with the bearing that receives the rotation shaft in the bearing housing portion, it is necessary to supply oil to those portions and to perform oil lubrication.

  In response to this, in a roots pump as an example of an apparatus having a biaxial rotating mechanism, an oil introduction hole extending in a radial direction is provided in a rotational direction with respect to a vertical direction in a rotor housing boss portion on a gear chamber side that supports a rotor shaft. Proposed is an oil seal oil supply device (see Patent Document 1) that is provided so as to incline upward, the outer end of the oil hole is open to the outer periphery of the boss portion, and the inner end is open to the inner periphery of the oil seal hole of the boss portion Has been.

  According to this, oil supply to the rubber ring of the oil seal can be satisfactorily performed even at a low rotation speed by providing the oil holes so as to incline upward with respect to the horizontal line in the rotation direction of the corresponding gear. As a result, the rubber ring can be maintained at an appropriate temperature, its life can be extended, and good sealing performance can be maintained over a long period of time.

JP 61-49185 (first page, third page, FIG. 1)

The problem to be solved regarding the gear oil lubrication structure of the biaxial rotating mechanism is that the prior art requires a process of drilling an oil hole as an oil flow path in the rotor housing boss, which is superior in oil circulation function and more A rational form that is easy to manufacture is not proposed.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a gear oil lubrication structure for a two-axis rotation mechanism in a rational form that is excellent in oil circulation function and easier to manufacture.

The present invention has the following configuration in order to achieve the above object.
According to the gear oil lubrication structure of the biaxial rotating mechanism according to the present invention, the pair of gears arranged in the gear box is a biaxial vertical structure in which two rotating shafts that are horizontally supported are arranged vertically. A driving force is transmitted between the two shafts, and a bearing that receives the rotating shaft and an upper and lower bearing housing portion that houses the oil seal in the upper and lower positions are provided, and a part of the casing of the gear box In the gear oil lubrication structure of the biaxial rotating mechanism including the partition wall constituting the upper and lower bearing housing portions, the upper and lower bearing housing portions are provided across the cylindrical wall portion protruding in a cylindrical shape from the wall surface of the partition wall portion into the gear box. A groove-like oil flow path having a depth capable of supplying oil to the bearing and the oil seal is formed on the upper side of the cylindrical wall portion, and a bearing and an oil seal are provided on the lower side of the cylindrical wall portion. Groove-shaped oil passage depth can be discharged oil is formed.

  Further, according to one aspect of the gear oil lubrication structure of the biaxial rotating mechanism according to the present invention, the biaxial vertical structure in which two rotating shafts supported so as to extend horizontally are arranged vertically and arranged in the gear box. The gear box is provided such that a driving force is transmitted between two shafts by a pair of gears, and includes a bearing that receives the rotating shaft and an upper and lower bearing housing portion that houses an oil seal in each of the upper and lower positions. In a gear oil lubrication structure of a biaxial rotating mechanism comprising a partition wall part forming a part of the casing, the upper and lower bearing housing portions project from the wall surface of the partition wall into the gear box in a cylindrical shape A groove-shaped or through-hole-shaped oil flow path is formed on the upper side of the cylindrical wall portion and can supply oil to the bearing and the oil seal. And a groove-like or through-hole-like oil flow path capable of discharging oil from the oil seal is formed, and an oil injection port communicating with the inside of the gear box is an upper end portion of a casing peripheral wall of the gear box, and the partition wall portion It is opened outside at a position farther from the pair of gears than the cylindrical wall portion that protrudes in a cylindrical shape from the wall surface into the gear box.

Further, according to one aspect of the gear oil lubrication structure of the biaxial rotation mechanism according to the present invention, the upper and lower oil flow paths are penetrated in a radial direction of the cylindrical wall portion and a direction inclined with respect to the vertical direction. The oil flow path is formed on the wall surface of the partition wall so as to guide the flow of oil to the oil flow path provided on the upper side of the cylindrical wall and to reinforce the partition wall An oil guiding rib portion having an oil flow guiding surface continuous from the lower inner surface may be provided.
Further, according to one aspect of the gear oil lubrication structure of the biaxial rotating mechanism according to the present invention, the groove-shaped oil is formed in a ring shape, fixed to the end surface of the cylindrical wall portion, and pressing the outer ring of the bearing. A bearing retainer provided so as to cover the flow path from above can be provided.

Further, according to one aspect of the gear oil lubrication structure of the biaxial rotating mechanism according to the present invention, the oil oil communication from the oil injection port to the gear box rather than the oil injection port provided at the upper end portion of the casing peripheral wall. These communication paths are widely provided.
Further, according to one aspect of the gear oil lubrication structure of the biaxial rotating mechanism according to the present invention, the inner surface of the upper peripheral wall, which is the casing peripheral wall of the gear box and is located above the gear, moves outward from the wall surface of the partition wall. It can be characterized by being inclined downward.

  According to the gear oil lubrication structure of the biaxial rotating mechanism according to the present invention, there is an especially advantageous effect that it is excellent in oil circulation function and can be made into a rational form that is easier to manufacture.

It is sectional drawing which shows the example of a form of the biaxial rotary pump provided with the gear oil lubrication structure of the biaxial rotary mechanism which concerns on this invention. It is a perspective view explaining a part of casing containing the partition part of the gearbox of the example of a form of Drawing 1.

Hereinafter, an example of a gear oil lubrication structure of a biaxial rotating mechanism according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 and 2).
This embodiment is a biaxial vertical structure in which two rotating shafts 21 and 22 that are supported so as to extend horizontally are arranged vertically, and a pair of gears 23 and 24 arranged in the gear box 10 are arranged between the two axes. The upper and lower bearing housing portions 13a and 13b are provided so as to transmit the driving force, and the bearing 17 and the oil seal 18 that receive the two rotary shafts 21 and 22 are accommodated in the upper and lower positions, and the pump. A gear oil lubrication structure of a biaxial rotary pump is provided that includes a partition wall 12 that defines a part of the casing 11 of the gear box 10 by partitioning the side of the cylinder 30 that forms the chamber 31 and the gear box 10. ing. The bearing housing portions 13a and 13b of this embodiment are constituted by a belling housing portion and an oil seal housing portion.

  The upper and lower bearing housing portions 13a and 13b are provided across the cylindrical wall portions 12a and 12b protruding in a cylindrical shape from the wall surface 12c of the partition wall portion 12 into the gear box 10, and the cylindrical wall portions 12a and 12b Groove-shaped oil passages 14a and 14b having a depth capable of supplying oil to the bearing 17 and the oil seal 18 are formed on the upper side, and the oil can be discharged from the bearing 17 and the oil seal 18 on the lower side of the cylindrical wall portions 12a and 12b. Groove-shaped oil passages 15a and 15b having a depth are formed. According to this, oil passages 14a, 14b, 15a, and 15b are provided at two locations in each of the two bearing housing portions 13a and 13b.

According to this, during operation, oil is circulated and lubricated to the bearing 17 and the oil seal 18 via the upper and lower oil flow paths 14a, 14b, 15a, 15b simultaneously with oil lubrication for the pair of gears 23, 24. Can do.
In addition, oil can be supplied from the upper groove-like oil flow paths 14a and 14b of the bearing 17 and the oil seal 18 at the time of oil injection before the first operation, and the lower groove-like oil flow paths 15a and 15b. Oil can be drained from. Thereby, the oil for lubrication can be suitably distributed to the bearing 17 and the oil seal 18.
Since the oil passages 14a, 14b, 15a, and 15b are groove-shaped, it can be manufactured by a mold, and has a rational form that is excellent in oil circulation function and easier to manufacture.

In this embodiment, the upper and lower groove-like oil flow paths 14a, 14b, 15a, 15b are provided in a form that is cut out in the radial direction of the cylindrical wall portions 12a, 12b and in the direction inclined with respect to the vertical. It has been. According to this, the upper and lower groove-like oil flow paths 14a, 14b, 15a, 15b are provided in a shape inclined in the radial direction at positions opposite to the circumference of the cylindrical wall portions 12a, 12b of 180 degrees. Become.
By providing the upper and lower groove-like oil flow paths 14a, 14b, 15a, and 15b as described above, a highly symmetric form can be obtained. The bearing 17 and the oil seal 18 are connected by the bearing housing portions 13a and 13b. It can be held properly. Further, since the lower groove-like oil flow paths 15a and 15b are not located at the lowermost part of the cylindrical wall portions 12a and 12b, the arc portion at the lower end is configured as an oil reservoir, and the function of oil circulation can be improved. .

Reference numerals 16a and 16b denote oil guiding ribs that guide the flow of oil to the groove-like oil flow paths 14a and 14b provided above the cylindrical wall portions 12a and 12b and reinforce the partition wall portion 12. In this manner, the wall surface 12c of the partition wall 12 is provided with a guide surface for the oil flow that continues from the inner surface of the lower groove that forms the groove-shaped oil flow paths 14a and 14b.
Further, in the present embodiment, the lower upper groove is provided directly below the upper lower groove-shaped oil passage 15a so that the oil is easily supplied from the upper bearing housing portion 13a to the lower bearing housing portion 13b. The oil flow path 14b is arranged.

According to this, the oil guide rib portions 16a and 16b guide the flow of oil at the time of oil injection or the like, and the oil is suitable from the upper groove-like oil flow paths 14a and 14b to the bearing 17 and the oil seal 18. Can supply.
Since the oil can be discharged from the lower groove-like oil flow paths 15a and 15b, the oil circulated to the bearing and the oil seal in the upper bearing housing portion 13a passes through the flow paths provided in the same manner as the upper stage. It can circulate to the bearing 17 and the oil seal 18 in the lower bearing housing portion 13b and be lubricated. As a result, lubricating oil can be suitably distributed to both the upper and lower bearings 17 and the oil seals 18.

  Reference numeral 20 denotes a bearing retainer, which is formed in a flat ring shape in the present embodiment, is fixed to the end faces of the cylindrical wall portions 12a and 12b, retains the outer ring of the bearing 17, and has a groove-like oil flow path 14a. , 14b, 15a, 15b are provided so as to cover from above. According to this, the oil is prevented from flowing out from the groove-like oil flow paths 14a, 14b, 15a, 15b to the gears 23, 24 side, and the supply of oil to the bearing 17 and the oil seal 18 is reduced. Can be prevented.

  Further, an oil injection port 19 communicating with the inside of the gear box 10 is an upper end portion of the casing peripheral wall 11a of the gear box 10, and a cylindrical wall portion protruding in a cylindrical shape from the wall surface 12c of the partition wall portion 12 into the gear box 10 It opens to the outside at a position farther from the pair of gears 23 and 24 than 12a and 12b. In this embodiment, the oil injection port 19 is opened to the outside at a position deeper toward the cylinder 30 that forms the pump chamber 31 than the cylindrical wall portions 12a and 12b in the horizontal direction at the upper end portion of the casing peripheral wall 11a. Yes.

  Thus, by providing the oil injection port 19 at a position recessed from the internal space of the gear box 10, it is possible to prevent the oil splashed up by the rotation of the gears 23 and 24 from being directly sprayed. For this reason, it can prevent suitably that oil comes out from the oil breather with which oil breathing 19 is equipped so that breathing between the inside of gearbox 10 and the exterior is permitted. This effect can be obtained equally regardless of whether the oil flow path has a groove shape or a through hole shape.

Further, an oil communication passage 19 a communicating from the oil injection port 19 to the gear box 10 is provided wider than the oil injection port 19 provided at the upper end portion of the casing peripheral wall 11 a. In this embodiment, it is widely provided from the space directly below the hole of the oil injection port 19.
According to this, at the time of oil injection, the oil spreads without accumulating, and the oil can be efficiently supplied into the gear box 10.

Further, the inner surface 11b of the upper peripheral wall, which is the casing peripheral wall 11a of the gear box 10 and located above the gears 23 and 24, is inclined downward toward the outer side away from the wall surface 12c of the partition wall portion 12. In this embodiment, the inner surface 11b of the upper peripheral wall of the case lid 10a for constituting the gear box 10 is inclined downward toward the outer side opposite to the cylinder 30 forming the pump chamber 31.
According to this, the oil scattered by the gears 23, 24 hits the inner surface 11 b of the inclined upper peripheral wall, jumps in the direction of the bearing 17 and the oil seal 18, and circulates. According to this, the oil circulation / lubricating function can be further enhanced.

  Moreover, you may give the process which smoothes the surface about the casting surface of the wall surface 12c of the partition part 12 which comprises some casings 11 of the gear box 10 so that the flow of oil may be improved. Also by this, the oil circulation / lubricating function can be further enhanced.

Next, the configuration of the biaxial rotary pump of this embodiment will be briefly described.
Reference numeral 30 denotes a cylinder, which forms a pump chamber 31 having a cross-sectional shape obtained by superimposing a part of two circles. Reference numeral 32 denotes one side plate portion, which is provided so as to close one end face of the cylinder 30. Reference numeral 33 denotes the other side plate portion, which is provided so as to close the other end face of the cylinder 30.

  The pair of rotating shafts 21 and 22 are inserted so as to be positioned in parallel in the cylinder 30 and are arranged so as to be rotated in the opposite direction at the same speed. One rotating shaft 21 is a drive-side shaft, and is provided to be connected to the electric motor side at one end side 21a. The other rotating shaft 22 is a driven shaft. One end side of the pair of rotating shafts 21 and 22 is through the bearing 17 held on the side wall 40 by the bearing holders 41a and 41b, and the other end side is through the bearing 17 held by the partition housing portion 12 on the bearing housing portions 13a and 13b. Bearings. A pair of gears 23 and 24 are fixedly engaged with the end portions on the other end side of the pair of rotating shafts 21 and 22.

  Then, the two rotors 25 and 26, each having a hook-shaped claw portion or the like so as to compress the gas that is inhaled while meshing with each other in a non-contact state, are integrally formed on each of the pair of rotating shafts 21 and 22. It is fixed and arranged in the cylinder 30.

  In addition, an intake port and an exhaust port provided so as to communicate with the inside of the cylinder 30 are provided in both side plate portions 32 and 33 so that intake and exhaust can be performed through both end surfaces of the cylinder 30. An intake connection port communicating with the intake port and an exhaust connection port communicating with the exhaust port are provided on the peripheral wall portion extending from both side plate portions 32 and 33. An oil reservoir 10b is provided at the lower part of the gear box 10 so that the oil pumped up by the gear 23 is accumulated.

Examples of the biaxial rotary pump that can use the present invention include non-contact type pumps such as a claw pump, a roots pump, and a screw pump.
In addition, this invention is not limited to the biaxial rotary pump demonstrated above, It can be used universally about another biaxial rotary mechanism.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

DESCRIPTION OF SYMBOLS 10 Gear box 11 Casing 11a Casing surrounding wall 11b Inner surface of upper surrounding wall 12 Partition part 12a, 12b Cylinder wall part 12c Wall surface 13a, 13b Bearing housing part 14a, 14b Upper oil flow path 15a, 15b Lower oil flow path 16a, 16b Oil guide rib portion 17 Bearing 18 Oil seal 19 Oil inlet 19a Oil communication passage 20 Bearing retainer 21 Rotating shaft 22 Rotating shaft 23 Gear 24 Gear 30 Cylinder 31 Pump chamber

Claims (6)

A biaxial vertical structure that vertically arranges two rotating shafts that are supported so as to extend horizontally, and is provided so that a driving force is transmitted between the two shafts by a pair of gears arranged in the gear box, In a gear oil lubrication structure of a biaxial rotating mechanism, comprising a bearing that receives the rotating shaft and an upper and lower bearing housing portion that accommodates an oil seal in respective upper and lower positions, and a partition portion that forms a part of the casing of the gear box. ,
Each of the upper and lower bearing housing portions is provided across a cylindrical wall portion protruding in a cylindrical shape from the wall surface of the partition wall portion into the gear box,
A groove-shaped oil flow path having a depth capable of supplying oil to the bearing and the oil seal is formed above the cylindrical wall portion, and a groove having a depth capable of discharging oil from the bearing and the oil seal is formed below the cylindrical wall portion. A gear oil lubrication structure for a biaxial rotating mechanism, characterized in that a shaped oil flow path is formed. A biaxial vertical structure that vertically arranges two rotating shafts that are supported so as to extend horizontally, and is provided so that a driving force is transmitted between the two shafts by a pair of gears arranged in the gear box, In a gear oil lubrication structure of a biaxial rotating mechanism, comprising a bearing that receives the rotating shaft and an upper and lower bearing housing portion that accommodates an oil seal in respective upper and lower positions, and a partition portion that forms a part of the casing of the gear box. ,
Each of the upper and lower bearing housing portions is provided across a cylindrical wall portion protruding in a cylindrical shape from the wall surface of the partition wall portion into the gear box,
A groove-like or through-hole-like oil flow path capable of supplying oil to the bearing and the oil seal is formed on the upper side of the cylindrical wall portion, and a groove shape or a drainage of the oil from the bearing and the oil seal is provided below the cylindrical wall portion. A through-hole-shaped oil passage is formed,
The oil injection port communicating with the inside of the gear box is an upper end portion of a casing peripheral wall of the gear box, and the pair of gears is more than the cylindrical wall portion protruding in a cylindrical shape from the wall surface of the partition wall portion into the gear box. A gear oil lubrication structure for a biaxial rotation mechanism characterized by opening to the outside at a position away from the center. The upper and lower oil flow paths are provided in a form penetrating in a radial direction of the cylindrical wall portion and in a direction inclined with respect to the vertical,
A lower side for forming the oil flow path on the wall surface of the partition wall so as to guide the oil flow to the oil flow path provided on the upper side of the cylindrical wall and reinforce the partition wall. The gear oil lubrication structure for a biaxial rotating mechanism according to claim 1 or 2, further comprising an oil guiding rib portion having an oil flow guiding surface continuous from an inner surface.   3. The biaxial shaft according to claim 2, wherein an oil communication path communicating from the oil injection port to the gear box is wider than the oil injection port provided at an upper end portion of the casing peripheral wall. Gear oil lubrication structure of rotating mechanism.   It is formed in a ring shape, and is fixed to an end surface of the cylindrical wall portion, and includes a bearing retainer provided to press the outer ring of the bearing and to cover the groove-shaped oil flow path from above. The gear oil lubrication structure of the biaxial rotating mechanism according to any one of claims 1 to 4.   6. The inner wall of an upper peripheral wall, which is a casing peripheral wall of the gear box and is located above the gear, is inclined downward toward an outer side away from the wall surface of the partition wall. The gear oil lubrication structure of the biaxial rotating mechanism described in 1.

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