JP2908266B2 - Decelerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed reducer for reducing the rotation of an input shaft by a gear reduction mechanism and transmitting the rotation to an output shaft.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional speed reducer of this type. This speed reducer 60
A gear case 62 is provided at an end of a motor (not shown) and has an opening at one end side. The rotation of the input shaft 61a is reduced by a gear reduction mechanism 63 housed in the gear case 62 and transmitted to the output shaft 61b. is there.

The gear reduction mechanism 63 includes a helical large gear 67 and a small gear 68 mounted on an intermediate shaft 65 rotatably supported by ball bearings 64, 64, and another ball bearing 64, 64.
A large gear 70 and a small gear 71 mounted on an intermediate shaft 69 rotatably supported by 64, and ball bearings 72 and 73;
And a large gear 75 attached to an output shaft 61b rotatably supported by the gears. These gears are assembled by two bearing holding plates 76, 77 and a support post 78 and assembled into the gear case 62.

The speed reducer 60 includes a helical pinion 66 at the end of an input shaft 61a to which rotation is transmitted from a motor (not shown) and the helical large gear 67 meshing with the helical pinion 66.
And a second-stage small gear 68 and a large gear 70 meshing with each other.
, A third-stage small gear 71 and a large gear 75 meshing therewith
Thus, the rotation of the input shaft 61a is reduced to three stages and transmitted to the output shaft 61b.

[0005]

However, in such a conventional speed reducer 60, the output shaft 61b is connected to the ball bearing 7
Since it is supported only by 2, 73, it is difficult to provide sufficient strength to the bearing part, and the strength may be insufficient, the life is short, and it is not possible to cope with a larger radial load or thrust load. There was a disadvantage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and has as its object to provide a roller bearing and a thrust bearing in a bearing portion.
By installing a slide bearing that can handle
It is an object of the present invention to provide a speed reducer that can easily provide a bearing portion with sufficient strength, does not have insufficient strength, has a long service life, and can easily cope with a large radial load and a thrust load.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a reduction gear for reducing the rotation of an input shaft and transmitting the rotation to an output shaft by a gear reduction mechanism having a plurality of gears housed in a gear case. In the gear case ,
A boss protruding in the same direction and a receiving hole formed in the boss to receive the output shaft, and an inward step is formed at an opening of the boss.
Surface was provided, and the receiving hole in the boss was fitted on the back side.
Needle roller bearing and abut on the step surface and fit into the mouth
And a sliding bearing capable of coping with a thrust load. The present invention further includes a gear case main body attached to an end of the motor and having an opening on one end side, wherein the rotation of the input shaft is reduced and output by a gear reduction mechanism having a plurality of gears housed in the gear case main body. In the speed reducer transmitting to the shaft, an engaging member fixed to the opening side of the gear case main body is provided, and the engaging member protrudes inward.
And a receiving hole formed in the boss and receiving the output shaft, and an inward step surface is provided at an opening of the boss.
In the receiving hole in the boss, a needle roller bearing fitted on the back side and a sliding bearing capable of supporting the thrust load fitted on the mouth side by contacting the step surface are provided .
However, the above problem can be solved .

[0008]

According to the present invention, a boss protruding inward and a boss inside the boss are provided.
A receiving hole is formed to receive the output shaft.
An inwardly facing step surface is provided, and the receiving hole in the boss is
Insert the needle roller bearing into contact with the step surface
With the addition of a sliding bearing that can be fitted on the side and can handle thrust loads, it is easy to provide sufficient strength to the bearing part, prolong the life, and easily cope with large radial loads and thrust loads. I do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded view of a speed reducer according to an embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof.

This reduction gear comprises a gear reduction mechanism 3 housed in a gear case main body 2 constituting a gear case 1,
An engaging member 4 is provided fixedly to the opening 2a side of the gear case main body 2, and a needle roller bearing 7 and a sliding bearing 8 capable of coping with a thrust load are provided in a receiving hole 5 provided in the engaging member 4. The needle roller bearing 7 and the slide bearing 8 receive the load of the shaft end portion of the output shaft 10.

The gear case 1 has a gear case main body 2 having an opening 2a on one end side, and an opening 2a of the gear case main body 2.
And an engaging member 4 fixed to the side of the motor. The engaging member 4 is assembled to an end of a motor (not shown).

The gear case body 2 has a rectangular shape with a uniform cross-sectional outer shape, forms a storage space 11 having a concentric circular cross-section, and is integrated laterally integrally with a boss 13 at a predetermined position of a support wall 12.
A receiving hole 14, a sealing hole 15 and a through hole 16 following the receiving hole 14 are provided at the location of the boss 13, and two receiving holes 17 and 18 are formed at another portion of the support wall 12. is there.

The gear case body 2 is provided with a receiving hole 14.
And the ball bearing 21 for the output shaft 10 is inserted into the seal hole 1.
The ball bearings 27 and 28 for the intermediate shafts 25 and 26 are provided by fitting the oil seal 22 into the receiving holes 17 and 18 in the hole 5, and the screw holes 19 are provided at the four corners at the end on the opening 2a side.

The reduction gear mechanism 3 includes a helical pinion 31 provided at an end of the input shaft 9 and a first intermediate shaft 2 meshing with the helical pinion 31.
5, a small gear 33 attached to the first intermediate shaft 25, and a second intermediate shaft 2 meshing therewith.
6 and a small gear 35 attached to the second intermediate shaft 26 and a large gear 36 attached to the output shaft 10 to reduce the rotation of the input shaft 9 in three stages and output. The gears are transmitted to the shaft 10, and each gear is housed in the housing space 11.

The engagement member 4 has a square flange 40 for coupling to the gear case main body 2 and, as shown in FIG.
An inwardly protruding boss 41 is integrally provided, and two receiving holes 42 and 43 are provided at predetermined inside positions, and the receiving shaft 5 for the output shaft 10 is provided in the receiving hole 5 having the inward step surface 5a in the boss 41. The needle roller bearing 7 shown in FIG. 3 and the slide bearing 8 shown in FIG. 4 are fitted and provided, and ball bearings 27 and 28 for receiving the respective intermediate shafts 25 and 26 are provided in the respective receiving holes 42 and 43. ing.

The engaging member 4 is provided at a predetermined position on the input shaft 9.
The gear case body 2 has a through hole 44 through which the tip of
A counterbore 45 formed in the flange 40 corresponding to the screw hole 19 and a bolt 47 inserted into the bolt hole 46 following the counterbore 45 are screwed into the screw hole 19 and fixed to the end face of the gear case body 2 on the opening 2a side. is there.

As shown in FIG. 3, the needle roller bearing 7 has a plurality of needle rollers 51 arranged at equal intervals in the circumferential direction along the inside of a cylindrical holding cylinder 50, as shown in FIG. As described above, the holding cylinder 50 is fitted into the back side of the receiving hole 5 in the boss 41 and
Cage, shaft end of the output shaft 10 is inserted.

The sliding bearing 8 is formed in a square cross section of the ring-like outer diameter greater than the holding cylinder 50 of the needle roller bearing 7, as shown in FIGS. 2 and 4, the receiving hole 5 of the boss 41 The end face 8a is fitted into the mouth, one end face 8a is brought into contact with the step face 5a, and the other end face 8b is slightly projected from the tip face 41a of the boss 41, and the shaft end of the output shaft 10 is inserted. I have.

The output shaft 10 has a step surface 10a and a small-diameter portion 10b formed at the shaft end portion inserted into the gear case 1, and the needle roller bearing 7 and the support wall 12 provided on the small-diameter portion 10b. The radial load is mainly received by the ball bearing 21 of the first embodiment, and the thrust load is received by bringing the step surface 10a into contact with the end surface 8b of the sliding bearing 8.

According to the above embodiment of the present invention, the radial load of the output shaft 10 is mainly received by the needle roller bearing 7 provided in the receiving hole 5 of the engaging member 4 attached to the opening 2a side of the gear case main body 2. The thrust load of the output shaft 10 can be handled by the slide bearing 8 using the stepped surface 5a of the receiving hole 5.

In the above embodiment of the present invention, the support wall 1
Ball bearing 2 which receives intermediate shafts 25 and 26 on engagement member 4 and engagement member 4
7 and 28, and there are no obstacles in the storage space 11, so that a plurality of gears can be efficiently arranged. The gear holding plates 76 and 77 and the support 78 shown in FIG. Reduction can be achieved.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. For example, a roller bearing and a slide bearing may be provided in the receiving hole on the gear case main body 2 side.

[0023]

According to the present invention, configured as described above, the inward
And a receiving hole for receiving the output shaft is formed in the protruding boss with the boss provided inward stepped surface provided on the mouth portion of the boss, Bo
Needle roller bearing fitted on the back side in the receiving hole in the
With the addition of a sliding bearing that can fit the thrust load and is fitted into the mouth by abutting on the step surface, it is easy to provide sufficient strength to the bearing part, and the strength does not become insufficient. This has the effect of having a long life and being able to easily cope with large radial loads and thrust loads.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a speed reducer according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a perspective view showing a roller bearing according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a sliding bearing according to an embodiment of the present invention.

FIG. 5 is an assembled view of the conventional speed reducer, cut away.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gear case 2 Gear case main body 2a Opening 3 Gear reduction mechanism 4 Engaging member 5 Receiving hole 5a Step surface 7 Needle roller bearing 8 Slide bearing 9 Input shaft 10 Output shaft 10a Step surface 41 Boss

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 59-24563 (JP, U) Japanese Utility Model Hei 6-48359 (JP, U) Japanese Utility Model Sho 55-87161 (JP, U) Japanese Utility Model Sho 58- 170450 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) H02K 7/116 F16C 33/46

Claims (2)

(57) [Claims] 1. A reduction gear for reducing the rotation of an input shaft and transmitting the rotation to an output shaft by a gear reduction mechanism having a plurality of gears housed in a gear case, wherein the gear case has
A boss protruding in the same direction and a receiving hole formed in the boss to receive the output shaft, and an inward step is formed at an opening of the boss.
Surface was provided, and the receiving hole in the boss was fitted on the back side.
Needle roller bearing and abut on the step surface and fit into the mouth
And a sliding bearing capable of coping with a thrust load. 2. An output shaft, comprising: a gear case body attached to an end of a motor and having an opening on one end side; and a gear reduction mechanism having a plurality of gears housed in the gear case body to reduce the rotation of the input shaft. Transmission to the
An engaging member fixed to the opening side of the gear case main body is provided, and the engaging member has a boss protruding inward and a boss inside the boss.
And a receiving hole is formed receiving the output shaft is provided, said ball
A stepped surface facing inward at the mouth of the boss, and receiving holes in the boss
The needle roller bearing fitted on the back side and the step surface
A speed reducer characterized by having a sliding bearing capable of coping with a thrust load, which is fitted on the mouth side by being in contact therewith.