JP2000274493A - Hypoid gear type geared motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydpoid gear type geared motor to shorten a time for machining and an assembly time and reduce the number of kinds of gear cases. SOLUTION: A racket 14 supports a motor shaft 2 on which a hypoid pinion 3 is provided. A gear case 17 is provided with a pair of casing members 171 and 172 divided in a direction vertical to a paper surface and supports a hypoid gear 5 and an output shaft 6. A positioning pin 19 has an axis center paralleling a motor shaft 2 and determines a position in a direction extending orthogonal to the motor shaft of the gear case 17 for a bracket 14 and the motor shaft 2 fitted in the gear case 17. Parallel pin holes 22 are individually machined with given precision without temporary assembly of casing members 171 and 172 and a need for a time for temporary assembly is eliminated. Since, by varying the position of the positioning pin 19, one kind of a gear case copes with a plurality of motor parts different in size, the number of kinds of the gear cases is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a hypoid gear type geared motor provided with a reduction gear having a hypoid gear.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a conventional hypoid gear type geared motor. FIG. 7 is a partial sectional view of a geared motor partially cut from an upper surface in a longitudinal direction, and FIG. It is sectional drawing cut | disconnected by VIII-VIII. In these figures, 1 is a motor part, 2 is a motor shaft, 3 is a hypoid pinion formed at the tip of the motor shaft 2, and 4 is a bracket for supporting the motor shaft 2.

Reference numeral 5 denotes a hypoid gear having an offset a so as to mesh with the hypoid pinion 3 and having an axis Y orthogonal to the axis X1 of the hypoid pinion 3. Reference numeral 6 denotes an output shaft that is rotationally driven through a plurality of gear trains (details are omitted) of parallel meshing, and 7 supports the output shaft 6, and is perpendicular to the axial direction of the output shaft 6. This is a split gear case. As shown in FIG. 8, the gear case 7 includes a pair of casing members 71, 7 divided into two in the vertical direction in FIG.
2.

[0004] The hypoid gear 5, the output shaft 6 and the gear case 7 constitute a reduction gear section 8. Reference numerals 4a and 7a denote spigot portions provided on the bracket 4 and the gear case 7, respectively, for positioning the hypoid pinion 3 and the hypoid gear 5 so as to mesh properly while maintaining the offset a.

Next, the operation will be described. When the motor 1 is energized, the motor shaft 2 rotates, the hypoid pinion 3 formed at the end of the motor shaft 2 and the hypoid gear 5 mesh with each other, and the output shaft passes through a plurality of gear trains in the reduction gear unit 8. 6, the torque is transmitted.

As means for positioning the hypoid pinion 3 concentric with the motor shaft 2 and the hypoid gear 5 so as to mesh with each other while maintaining the offset a, the bracket 4 is provided with a spigot portion 4a concentric with the motor shaft 2. Also, each of the casing members 71 and 72 constituting the gear case 7 is also provided with a half-moon-shaped protruding portion which is fitted to the spigot portion 4a of the bracket 4, thereby forming a circular spigot portion 7a as a whole.

[0007]

As described above, in the hypoid gear type geared motor, the gear case 7 is divided into two casing members 71 and 72 which can be separated in a direction perpendicular to the axial direction of the output shaft 6. And the spigot part 7
a must be fitted to the spigot portion 4a of the bracket 4 with a predetermined accuracy, and the offset a between the hypoid pinion 3 and the hypoid gear 5 needs to be a predetermined accuracy.

Since the offset a requires high accuracy, it is necessary to combine the two divided casing members 71 and 72 before machining the spigot portion 7a with a predetermined accuracy. That is, the spigot part 7
a casing member 7 divided into two parts for processing a
It is necessary to temporarily combine 1, 72, and extra time is required for processing the spigot portion 7a.

Further, for example, if the total reduction ratio of the reduction gear unit 8 increases, the transmission torque increases in proportion to the reduction ratio. Therefore, in this case, it is common to use a combination of motor sections each having a smaller motor output by one stage. At this time, the spigot portion 7a of the bracket 7 becomes smaller than usual, and the offset a between the hypoid pinion 3 and the hypoid gear 5 also changes, so that the dimensions of the spigot portion 7a and the center position of the spigot portion 7a are different. It was necessary to manufacture a gear case similar in shape.

Furthermore, even if the position of contact between the hypoid gears 3 and 5 is unsuitable and the offset a is finely adjusted, an appropriate adjusting means for positioning the spigot fitting cannot be obtained, and it takes time to assemble. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a hypoid gear type geared motor that can reduce the time required for machining and the time required for assembly and reduce the number of types of gear cases. And

[0012]

In order to achieve the above object, a hypoid gear type geared motor according to the present invention comprises a motor portion having a motor shaft provided with a hypoid pinion and a bracket for supporting the motor shaft, a predetermined direction. A reduction gear having a pair of casing members adapted to be separated into a hypoid gear meshing with a hypoid pinion by the pair of casing members and a gear case rotatably supporting an output shaft rotatably driven by the hypoid gear; A plurality of positioning pins having an axis parallel to the motor shaft and fitted to the bracket and the gear case to determine a position of the gear case with respect to the motor shaft in a direction orthogonal to the motor shaft are provided. The positioning pin is used to determine the position of the gear case in the direction perpendicular to the motor shaft with respect to the motor shaft so that the offset between the hypoid poid pinion and the hypoid gear becomes a predetermined value. The position at which the positioning pin is fitted to the casing member can maintain a predetermined accuracy even if the individual casing members are individually processed without temporarily combining a pair of casing members, so that there is no need to temporarily combine the casing members for processing. Time can be reduced. If the positions of the positioning pins fitted to the bracket or the gear case are changed, necessary offsets can be set for a plurality of motor parts having different dimensions in one type of gear case.

[0013] At least one of the positioning pins is provided with two pin portions which have different axes and are respectively fitted to the bracket and the gear case, and at least one of the two pin portions rotates. It is characterized by being an eccentric pin that can be fitted. By rotating the eccentric pin, the relative position of the bracket and the gear case in a direction perpendicular to the motor shaft can be adjusted, and the offset between the hypoid poid pinion and the hypoid gear can be easily adjusted.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 is a partial cross-sectional view of a hypoid gear type geared motor partially cut from a top surface in a longitudinal direction, and FIG. 2 is a cut surface II-I of FIG.
3 is a rear view of the bracket. FIG. 4 is a front view of a state where a gear case divided at right angles to the axial direction of the output shaft is combined. FIG. 5 is a rear view of the bracket in the case where the reduction ratio is large and the output of the motor part is one step smaller.

In these figures, 11 is a motor part,
Reference numeral 2 denotes a motor shaft, reference numeral 3 denotes a hypoid pinion formed at the end of the motor shaft 2, and reference numeral 14 denotes a bracket for supporting the motor shaft 2. As shown in FIG.
Are provided with two cylindrical parallel pin holes 20 each having a central axis parallel to the motor shaft 2. A parallel pin 19 described later is fitted into the parallel pin hole 20 by interference fitting. There are also four bolt holes 14b through which the bolt 9 (FIG. 1) passes. The horizontal plane J is the central axis X1 of the motor shaft 2.
, And is perpendicular to the paper in FIG.

Reference numeral 5 denotes a hypoid gear having an offset a so as to mesh with the hypoid pinion 3 and having an axis Y orthogonal to the axis X1 of the hypoid pinion 3. Reference numeral 6 denotes an output shaft that is rotationally driven through a plurality of gear trains (the details of which are not shown) with parallel meshing. Gear case 17
Is a pair of casing members 1 divided so as to be separable in the direction perpendicular to the axial direction of the output shaft 6, that is, in the left-right direction in FIG.
71, 172, and the casing members 171, 17
2, the output shaft 6 is rotatably supported. The hypoid gear 5, the output shaft 6, and the gear case 17 constitute a speed reducer section 18.

In the gear case 17, as shown in FIG.
Two parallel pin holes 22 are provided at two places, and another parallel pin hole 23 is provided at two places. Further, four screw holes 17b into which the screw portions of the bolt 9 are screwed are provided. The hole 17a of the gear case 17 is made sufficiently larger than the projecting portion 14a of the bracket 14 to prevent interference when the bracket 14 and the gear case 17 are assembled.

The parallel pin hole 2 provided in the bracket 14
A parallel pin 19 is fitted in the parallel pin hole 22 and the parallel pin hole 22 provided in the gear case 17, and the position of the gear case 17 with respect to the bracket 14 in the direction perpendicular to the axis X1 is regulated so as to ensure a predetermined accuracy. are doing. Therefore, the offset a between the hypoid pinion 3 and the hypoid gear 5
Accuracy is also ensured.

The casing members 171 and 172 constituting the gear case 17 are provided with respective casing members 171 and 172.
In a single state, the parallel pin holes 22 and 23 (FIG. 4) are each processed in advance. In the processing of the parallel pin holes 22 and 23, necessary accuracy can be sufficiently secured by using a jig. Thus, each casing member 17
Since both of the casing members 171 and 172 can be processed in a single state, the casing members 171 and 172 do not need to be temporarily combined for processing, and the time for temporary assembly is not required.

In the conventional gear case 7 shown in FIG. 7, the required accuracy cannot be ensured unless the casing parts 71 and 72 are combined to form the spigot portion 7a.
This is because the accuracy of the offset a must be ensured by fitting the bracket 4 to the spigot portion 4a.

FIG. 5 shows the bracket 24 of the motor part 21 whose output is one step smaller than the motor part 11 of FIG. The bracket 24 is provided with two cylindrical parallel pin holes 31 having a central axis parallel to the motor axis. The horizontal plane K in FIG. 5 is a horizontal plane including the central axis X2 of the motor axis of the motor section 21, and is perpendicular to the paper in FIG.

When assembling the gear case 17 and the motor section 11, the following is performed. A parallel pin 19 (FIG. 1) is previously press-fitted into the parallel pin hole 22 of the gear case 17 with an interference fit with about half of the entire length protruding. Next, two parallel pin holes 2 provided in the bracket 14 are provided.
The bracket 14 is brought into contact with the gear case 17 by fitting the parallel pin 19 with the 0 as a guide. As a result, the motor shaft 2 and the gear case 17, that is, the hypoid pinion 3 and the hypoid gear 5 are positioned so that the offset between them becomes a predetermined dimension a. Thereafter, the two are fastened with the bolt 9 to obtain the state shown in FIG.

When the motor case 21 of FIG. 5 having a small output is combined with the gear case 17 of FIG. 4, the parallel pin 19 is similarly inserted into another parallel pin hole 23 of the gear case 17 (FIG. 4). Are fitted to each other with an interference fit. A parallel pin hole 31 (FIG. 5) of the bracket 21 is fitted to the parallel pin 19. As a result, the offset between the hypoid pinion provided in the motor portion 21 and the hypoid gear 5 is positioned so as to have a predetermined precision dimension b (FIG. 1).

As described above, the gear case 17 can machine the parallel pin holes 22, 23 and the like individually into the two divided gear cases 171, 172, so that the time for temporary assembly is not required, and the processing cost is reduced. Becomes cheaper. The size and position of the screw hole 17b (FIG. 4) into which the bolt 9 for fastening the bracket and the gear case 17 is screwed are determined by the motor parts 11 and 12.
Although it may vary depending on the size of 1, it goes without saying that in this case, it is only necessary to process according to the size.
Further, even if the output and offset of the motor section are different, the same gear case can be used for a plurality of motor sections having different dimensions, and the type of gear case can be reduced.

Embodiment 2 In the embodiment of FIG. 1, the case where the parallel pins are used is shown. On the other hand, an eccentric pin as shown in FIG. 6 can be used. FIG.
FIG. 6A is a plan view of the eccentric pin having the same diameter, and FIG. 6B is a front view thereof.
And a second pin 39b having a central axis Z2 and having the same diameter as the first pin 39a are formed integrally with each other with a distance c eccentricity. A slot 39c is provided at the tapered end of the second pin 39b.

In this case, the first pin portion 39a is fitted, for example, in the parallel pin hole 22 of the gear case 17 of FIG. 4 with a slight clearance fit, and is rotated by engaging a slotted screwdriver with the slot 39c. Then, since the shaft Z2 rotates about the axis Z1, the positional relationship of the gear case 17 in the direction orthogonal to the motor shaft of the bracket, that is, the offset between the hypoid gear and the hypoid pinion is easily finely adjusted. Can be easily assembled. The eccentric pin does not need to have the same diameter at the first and second pin portions.

[0027]

Since the present invention is configured as described above, it has the following effects.

A motor portion having a motor shaft provided with a hypoid pinion and a bracket for supporting the motor shaft, a pair of casing members capable of being separated in a predetermined direction, and having the hypoid pinion formed by the pair of casing members. A reduction gear provided with a hypoid gear that meshes with a gear case and a gear case rotatably supporting an output shaft that is rotationally driven by the hypoid gear; Since a plurality of positioning pins for determining a position in a direction perpendicular to the axis are provided, the positioning pin is orthogonal to the motor shaft of the gear case with respect to the motor shaft so that the offset between the hypoid poid pinion and the hypoid gear becomes a predetermined value. Determine the position of the direction However, the position at which the positioning pin is fitted to the casing member can ensure a predetermined accuracy even if the individual casing members are individually processed without temporarily combining the pair of casing members, and the time for temporarily assembling for processing is unnecessary. Processing time can be reduced. If the position of the positioning pin fitted to the bracket or gear case is changed, the required offset can be set for each of a plurality of motor parts having different dimensions in one type of gear case, and one type of gear case Can be combined with a plurality of motor parts, and the number of gear cases can be reduced.

Further, at least one of the positioning pins is provided with two pin portions having different axes and fitted respectively to the bracket and the gear case, and at least one of the two pin portions is rotated. It is characterized by being an eccentric pin that can be fitted, so that by rotating the eccentric pin, the relative position of the bracket and the gear case in a direction perpendicular to the motor shaft can be adjusted, and the hypoid poid pinion and the hypoid gear can be adjusted. Can be easily adjusted, and the assembling time can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a hypoid gear type geared motor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along a cutting plane II-II in FIG.

FIG. 3 is a rear view of the bracket of FIG. 1;

FIG. 4 is a front view of a state where a gear case divided at right angles to the axial direction of the output shaft is combined.

FIG. 5 is a rear view of the bracket when the reduction ratio is large and the output of the motor unit is one step smaller.

FIG. 6A is a plan view of an eccentric pin, and FIG. 6B is a front view.

FIG. 7 is a partial sectional view of a conventional hypoid gear type geared motor.

8 is a cross-sectional view taken along a cutting plane VIII-VIII in FIG.

[Description of Signs] 2 motor shaft, 3 hypoid pinion, 5 hypoid gear, 6 output shaft, 11, 21 motor unit, 1
4,24 bracket, 17 gear case, 171,1
72 casing member, 19 parallel pins, 20, 22,
23, 31 Parallel pin hole, 39 Eccentric same diameter pin, 39a
First pin portion, 39b Second pin portion.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shunsuke Takagi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Within Mitsubishi Electric Corporation (72) Inventor Isao Ichimaru 1-1-1, Imajukuhigashi, Nishi-ku, Fukuoka City, Fukuoka Prefecture No. F-Semicon Engineering Co., Ltd. F-term (reference) 3J009 DA12 DA13 DA20 EA05 EA18 EA25 EA35 EA44 EB24 EC06 FA14 3J063 AA31 AB04 AC01 BA01 CD46 XA05 XA11 5H607 AA11 BB01 CC01 CC03 CC09 DD02 DD03 DD08 DD09 EE31

Claims (2)

[Claims] 1. A motor portion having a motor shaft provided with a hypoid pinion and a bracket for supporting the motor shaft, a pair of casing members capable of being separated in a predetermined direction. A reduction gear provided with a hypoid gear meshing with the hypoid pinion and a gear case rotatably supporting an output shaft rotatably driven by the hypoid gear, a shaft having a shaft center parallel to the motor shaft and fitted to the bracket and the gear case. A hypoid gear type geared motor having a plurality of positioning pins for determining a position of the gear case with respect to the motor shaft in a direction orthogonal to the motor shaft. 2. At least one of the positioning pins is provided with two pin portions which have different axes and are respectively fitted to a bracket and a gear case, and at least one of the two pin portions is turned. The hypoid gear-type geared motor according to claim 1, wherein the eccentric pin is movably fitted.