JP2010141945A - Geared motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geared motor capable of very easily changing a speed reduction ratio between a cylindrical gear provided on an output shaft of the motor and a face gear mated with the cylindrical gear. <P>SOLUTION: The geared motor includes a motor 20 having a cylindrical gear using a helical gear for an output shaft, and a gear speed reducer 30 with a face gear, as an initial stage gear, mated with the helical gear. In the geared motor, the cylindrical gear 22 and the initial stage gear are offset and mated with each other so that the shafts may not cross, the initial stage gear can be pivotally supported on different portions in a case 31 of the gear speed reducer 30, and the face gears 32, 35 having different speed reducing ratio can be assembled as the initial stage gear at the pivotally supporting positions on the different portions. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a geared motor in which an output shaft of a motor and an input shaft of a gear reducer are arranged in a direction that is different, and more particularly to a geared motor using a face gear as a first gear of a gear reducer.

A gear reducer that uses a face gear or a hypoid gear to extract power in a direction perpendicular to or different from the output shaft of an electric motor is known.
The face gear is a spur gear or a disc-shaped gear that meshes with a helical gear, and is used for an orthogonal axis or a staggered axis.
On the other hand, a hypoid gear is a conical gear that transmits motion between staggered shafts, and is a gear similar to a spiral bevel gear with the shafts of large and small gears offset.
For example, Patent Documents 1 and 2 are known as conventional geared motors using face gears.

  As a face gear conventionally used, a face gear 100 as shown in FIG. 6 is known. The face gear 100 is formed in a disk shape, and an attachment hole 102 for attaching the face gear 100 to the driven shaft 101 is provided at the center. At the outer edge portion of the flat surface 103 of the face gear 100, a gear cutting portion 104 protruding in the axial direction from the flat surface 103 is provided so as to extend in an annular shape. The gear cutting portion 104 is provided with a plurality of driven side meshing teeth 105. The driven side meshing teeth 105 extend in a direction perpendicular to the axis of the face gear 100.

  A spur gear 107, also called a pinion, is attached to the output shaft 106 of the electric motor that extends in a direction orthogonal to the driven shaft 101, and the outer peripheral surface of the spur gear 107 meshes with the driven meshing teeth 105 of the face gear 100. A plurality of drive-side meshing teeth 108 are provided.

  When the output shaft 106 is rotated by the drive of the electric motor, the driving-side meshing teeth 108 of the spur gear 107 are pressed one by one against the driven-side meshing teeth 105 of the face gear 100 as shown in FIG. Rotate around.

  However, in the face gear 100, each drive side meshing tooth 108 of the spur gear 107 is pressed against each one of each driven side meshing tooth 105 in the face gear 100. Therefore, after the predetermined drive-side meshing tooth 108 is pressed against the driven-side meshing tooth 105, the drive-side meshing tooth 108 located next to the drive-side meshing tooth 108 is pressed against the driven-side meshing tooth 105. The rotational speed of the face gear 100 becomes slow. Then, the face gear 100 whose rotational speed has become slow increases in rotational speed when the drive-side meshing teeth 108 are pressed against the driven-side meshing teeth 105. Therefore, the rotational speed of the face gear 100 becomes slow or fast, and there is a problem that the face gear 100 cannot be smoothly rotated.

Therefore, as shown in FIG. 8, there is known a face gear 200 provided with driven meshing teeth 205 that are inclined at an equal angle with respect to the outer peripheral surface. These driven-side meshing teeth 205 are formed so as to be convex toward the arrow W direction.
The output shaft 206 of the electric motor is arranged such that its axis extends in a direction perpendicular to the axis of the driven shaft 201 and intersects the axis of the driven shaft 201. The meshing teeth 205 of the face gear 200 are meshed with a bevel gear 207 attached to the output shaft 206 of the electric motor. A plurality of meshing teeth 208 extending spirally about the axis of the oblique gear 207 are provided on the outer peripheral surface of the oblique gear 207, and the meshing teeth 208 are meshed with the face gear 200 as shown in FIG. The rotation is transmitted by meshing with the teeth 205 (see Patent Document 1).

Also in Patent Document 2, rotation is transmitted between a face gear arranged in an orthogonal direction and a helical pinion of a motor.
JP-A-9-123021 JP 2007-74789 A

In such an orthogonal shaft geared motor using a conventional face gear, it is necessary to change the specifications of the pinion and the gear or to change the positional relationship between the pinion and the gear when changing the reduction ratio. .
Therefore, in order to change the reduction ratio, it is necessary to newly prepare a motor pinion or a gear case, and there is a problem that the reduction ratio cannot be changed after both the motor pinion and the gear case are shared.

An object of the present invention is to solve the above-described problems and to provide a geared motor that can very easily change a reduction ratio between a cylindrical gear provided on an output shaft of a motor and a face gear meshing with the cylindrical gear.
In addition, the present invention makes it possible to share both the motor and gear case parts by changing the arrangement and direction of the face gear even if the first stage reduction ratio is different and there are two types of offset amounts, and the number of parts is reduced. The purpose is to let you.

In order to solve the above problems, the present invention includes a motor having a cylindrical gear using a helical gear as an output shaft, and a gear reducer including a face gear meshing with the helical gear as a first stage gear. In this geared motor, the cylindrical gear and the first gear are offset and meshed so that their axes do not cross each other, and the first gear is configured to be pivotally supported at different locations in the case of the gear reducer. Further, it is possible to selectively assemble face gears having different reduction ratios as the first-stage gears at the shaft support positions at the different locations.
Further, the present invention is set such that the shortest distances from the respective shaft support positions to the inner wall surface of the case are different from each other, and the reduction gear ratio is selected by selecting the diameter and the number of teeth of the face gear assembled to each of the shaft support positions. It is in having set.
Further, according to the present invention, the face gears having different diameters are set to be attachable to the respective pivot support positions with the output shaft interposed therebetween, and the face gears are reversed according to the pivot support positions of the face gears. It is in meshing with the cylindrical gear in the direction.
Still further, the present invention resides in that an effective tooth width capable of meshing is provided in a cylindrical gear provided on the output shaft of the motor regardless of the shaft support position and the number of teeth of the first stage gear of the gear reducer.

According to invention of Claim 1, the geared motor which can change a reduction ratio very easily can be obtained. Therefore, even if the first stage reduction ratio is changed, a design that can share both the motor and the gear case parts is possible, and the cost can be reduced.
According to the invention of claim 2, effective use in the case can be achieved and the maximum reduction ratio can be obtained.
According to the invention of claim 3, the offset direction of the cylindrical gear with respect to the face gear can be matched by assembling the face gear in the reverse direction according to the axial support position of the face gear.
According to the invention of claim 4, the cylindrical gear can be meshed in common with the face gears having different numbers of teeth.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1A and 1B are examples of a geared motor in which the reduction ratio of the first-stage reduction gear employed in the gear reducer is 1/5. FIGS. 2A and 2B are gear reductions. This is an example of a geared motor in which the reduction ratio of the first reduction gear employed in the machine is 1/8.

  In FIGS. 1A and 1B and FIGS. 2A and 2B, reference numeral 1 denotes a geared motor. The geared motor 1 includes a motor 20 and a gear reducer 30, and is connected via a mounting bolt 21. The motor 20 is assembled to the gear reducer 30. A cylindrical gear 22 using a helical gear as a pinion is provided integrally or separately on the output shaft 20a of the motor 20, and the cylindrical gear 22 is set to a certain length. In this embodiment, the cylindrical gear 22 is machined into a right-handed helical gear.

In the case of FIGS. 1A and 1B, the output shaft 20a of the motor 20 is inserted into the case 31 of the gear reducer 30 and is used as the first stage gear provided in the case 31 of the gear reducer 30. The cylindrical gear 22 meshes with a face gear (also referred to as a crown gear) 32. The face gear 32 is formed by annularly forming a curved tooth surface 32a that meshes with the helical gear of the cylindrical gear 22 on the peripheral edge of one surface of a disk-shaped main body, and serves as an axis that intersects the output shaft 20a of the motor 20. It is supported by the provided first reduction shaft 33. The first reduction shaft 33 is rotatably supported via bearings 33a and 33b provided in the case 31 of the gear reducer 30. The first reduction shaft 33 is arranged in a direction offset in parallel with a constant width e1 from a direction orthogonal to the output shaft 20a of the motor 20.
A gear 34 is mounted on the first reduction shaft 33, and a gear 38 that meshes with the gear 34 is supported by an output shaft 39. The output shaft 39 is rotatably supported via bearings 39a and 39b provided in the case 31 of the gear reducer 30. Oil seals 40 are provided at both ends of the output shaft 39 to seal between the inner surface of the case 31.

2 (a) and 2 (b), the output shaft 20a of the motor 20 is inserted into the case 31 of the gear reducer 30 and is used as a first stage gear provided in the case 31 of the gear reducer 30. The cylindrical gear 22 meshes with a face gear (also referred to as a crown gear) 35. The face gear 35 is formed by annularly forming a curved tooth surface 35a meshing with the helical gear of the cylindrical gear 22 at the peripheral edge of one surface of a disk-shaped main body, and as an axis intersecting the output shaft 20a of the motor 20. It is supported by the first reduction shaft 36 provided. The first reduction shaft 36 is rotatably supported via bearings 36 a and 36 b provided in the case 31 of the gear reduction device 30. The first reduction shaft 36 is disposed in a direction offset in parallel by a constant width e2 from a direction orthogonal to the output shaft 20a of the motor 20.
A gear 37 is mounted on the first reduction shaft 36, and a gear 38 that meshes with the gear 37 is supported by an output shaft 39. The output shaft 39 is rotatably supported via bearings 39a and 39b provided in the case 31 of the gear reducer 30. Oil seals 40 are provided at both ends of the output shaft 39 to seal between the inner surface of the case 31.

  The case 31 of the gear reducer 30 includes a gear case 31a and a gear flange 31b. A first reduction shaft (input shaft) 33 of the gear reducer 30 is disposed at a position offset from the direction orthogonal to the output shaft 20a of the motor 20 by a predetermined width e1 and parallel to the upper side, and the motor 20 On the opposite side of the first reduction shaft (input shaft) 33 with the output shaft 20a therebetween, at a position offset in parallel to the lower side by a fixed width e2 from the direction orthogonal to the output shaft 20a of the motor 20. A first reduction shaft (input shaft) 36 of the gear reducer 30 is disposed. Thus, the rotation of the output shaft 20a of the motor 20 is extracted from the output shaft 39 of the gear reducer 30 in a direction orthogonal to the output shaft 20a or in a direction orthogonal to the surface including the output shaft 20a.

FIGS. 1A and 1B are examples of a geared motor in which the reduction ratio of the first stage is set to 1/5. As shown in FIG. 3, when the reduction ratio is 1/5, the outside of the face gear 32 is shown. Since the diameter is small, the motor 20 is disposed above the output shaft 20a. The diameter of the gear 34 attached to the first reduction shaft 33 is increased and meshed with the gear 38 attached to the output shaft 39 of the gear reducer 30. The tooth surface 32 a of the face gear 32 is meshed with the cylindrical gear 22 provided on the output shaft 20 a of the motor 20.
2 (a) and 2 (b) are examples of a geared motor in which the first stage reduction ratio is 1/8. As shown in FIG. 4, when the reduction ratio is 1/8, the outer diameter of the face gear 35 is shown. Is larger than the output shaft 20 a of the motor 20. The tooth surface 35 a of the face gear 35 is meshed with the cylindrical gear 22 provided on the output shaft 20 a of the motor 20.
FIG. 5 shows the positional relationship between the cylindrical gear 22 provided on the output shaft 20a of the motor 20 and the first reduction shafts 33, 36. The face gears 32, 35 attached to the first reduction shafts 33, 36 are shown. Is capable of machining the housing portion into which the bearings 33a and 33b and the bearings 36a and 36b of the first reduction shafts 33 and 36 are accommodated, and the face gears 32 and 35 can be accommodated. , E2 and distances L1 _and L2 to the gear case inner wall 31c are designed.

  A case 31 of the gear reducer 30 includes a gear case 31a and a gear flange 31b, and is formed by curving inner wall surfaces 31c and 31d before and after the gear case 31 in a circular arc shape inward in the vertical direction. The motor 20 is connected to the front side of the gear case 31, and the face gears 32 and 35 are arranged close to the inner wall surface 31c on the motor 20 side.

  Next, when using a geared motor in which the reduction gear ratio of the first stage of the above-described reduction gear is 1/5, the face gear 32 is moved to the first reduction shaft 33 as shown in FIGS. Used by assembling to. A gear 34 is assembled to the first reduction shaft 33 together with the face gear 32, and is assembled to the case 31 via bearings 33a and 33b. Then, the tooth surface 32a of the face gear 32 is engaged with the cylindrical gear 22 provided on the output shaft 20a of the motor 20, and the gear 34 assembled to the first reduction shaft 33 is engaged with the gear 38 attached to the output shaft 39. Let Thus, the rotation of the output shaft 20a of the motor 20 can be reduced to 1/5 and taken out from the first reduction shaft 33 by the face gear 32.

  When a geared motor having a reduction gear ratio of 1/8 of the above-described reduction gear is used, the face gear 35 is connected to the first reduction shaft 36 as shown in FIGS. Assemble and use. At this time, the face gear 35 is assembled in the direction opposite to the face gear 32. A gear 37 is assembled to the first reduction shaft 36 together with the face gear 35, and is assembled to the case 31 via bearings 36a and 36b. Then, the tooth surface 35a of the face gear 35 is engaged with the cylindrical gear 22 provided on the output shaft 20a of the motor 20, and the gear 37 assembled to the first reduction shaft 36 is engaged with the gear 38 attached to the output shaft 39. Let Thus, the rotation of the output shaft 20a of the motor 20 can be reduced to 1/8 by the face gear 35 and taken out from the first reduction shaft 33.

At that time, the cylindrical gear 22 as the output shaft 20a of the motor 20 is set to a sufficient effective tooth width so as to mesh with both the face gears 32 and 35.
Thus, the motor 20, the gear case 31a, and the gear flange 31b can be shared even when the first stage has different reduction ratios and different offset amounts are given.

  Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, the first stage reduction ratio is set using the face gears 32 and 35 to which two different offset amounts are given. Although the example of decelerating to 1/5 or 1/8 has been described, it is a matter of course that the first stage reduction ratio can be further changed by using face gears having different gear ratios. In addition, it cannot be overemphasized that it can change suitably and can implement within the range which does not change the gist of the present invention.

(A) It is a front view which opens the inside of a reduction gear and shows the geared motor which set the reduction ratio of the 1st step | paragraph to 1/5 by embodiment of this invention. (B) is the sectional view on the AA line of (a). (A) It is a front view which shows the geared motor which set the reduction ratio of the 1st step | paragraph to 1/8 by embodiment of this invention open | released the inside of a reduction gear. (B) is the BB sectional drawing of (a). It is the elements on larger scale which show the cylindrical gear and face gear of FIG.1 (b). It is the elements on larger scale which show the cylindrical gear and face gear of FIG.2 (b). It is a conceptual diagram which shows meshing | engagement of the cylindrical gear of FIG. 1 (a) and FIG. 2 (a), and a face gear. It is a top view which shows the conventional face gear. It is the elements on larger scale of FIG. It is a top view which shows the conventional face gear. It is the elements on larger scale of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Geared motor 20 Motor 20a Output shaft 22 Cylindrical gear 30 Gear reducer 31 Case 31a Gear case 31b Gear flange 32, 35 Face gear 33, 36 First reduction shaft 34, 37, 38 Gear 39 Output shaft

Claims (4)

In a geared motor comprising a motor having a cylindrical gear using a helical gear as an output shaft, and a gear reducer having a face gear meshing with the helical gear as the first stage gear, the cylindrical gear and the first stage The gears are offset so that their axes do not cross each other and meshed, and the first stage gear is configured to be pivotally supported at different locations in the case of the gear reducer, and at the pivot locations of the different locations, A geared motor characterized in that a face gear with a different reduction ratio can be selectively assembled as a first stage gear. The shortest distance from each shaft support position to the inner wall surface of the case is set to be different, and the reduction ratio is set by selecting the diameter and the number of teeth of the face gear assembled to each shaft support position. The geared motor according to claim 1. The face gears of different diameters are set to be attachable to the respective pivot support positions with the output shaft sandwiched therebetween, and the face gear is reversed to the cylindrical gear according to the pivot support position of the face gear. The geared motor according to claim 1, wherein the geared motor is engaged. 4. The effective gear width according to claim 1, wherein the cylindrical gear provided on the output shaft of the motor is provided with an effective tooth width that can be engaged regardless of the shaft support position and the number of teeth of the first gear of the gear reducer. The geared motor according to claim 1.

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