JPS6225567Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a reduction gear with a transmission mechanism installed on the output side of the prime mover, particularly a planetary gear type reduction gear, in agricultural machinery and other motorized machinery. be.

[Conventional technology]

The present applicant has proposed a planetary gear reducer with a simple structure that is capable of intermittent power transmission and switching between high and low speeds (see Japanese Utility Model Publication No. 40370/1983).

In addition, we proposed a structure that ensures the alignment of the inner and outer concentric arrangement of the two large and small inner toothed outer rings in the planetary gear reducer proposed above, and the axial positioning of each outer ring (see Japanese Utility Model Publication No. 18274/1983). ).

A planetary gear reducer with a transmission mechanism including the above-mentioned two proposed structures will be explained with reference to FIGS. 1 and 2.

1 and 2 are a driving shaft and a driven shaft arranged on the same axis; 3 is a support frame that rotates together with the driven shaft 2; A planetary stage gear 4 is rotatably mounted by a shaft 5.

Outside the planetary stage gear 4, two large and small internally toothed outer rings 6 and 7 are arranged concentrically with each other. 8 and the large diameter internal toothed outer ring 6, and the small diameter side gear 42 of the planetary stage gear 4 is meshed with the small diameter internal toothed outer ring 7.

The above mechanism is housed in a case 9 that stores lubricating oil, and the large-diameter inner-toothed outer ring 6 has support protrusions 10, 11, It is rotatably supported by 12.

The small-diameter internal tooth outer ring 7 is placed on the disk surface of the large-diameter gear 41 of the planetary stage gear 4, and the outer periphery of the washer 13 attached to the upper end surface of the gear 4 is placed on the upper surface of the teeth of the small-diameter internal tooth outer ring 7. It's layered. That is, the step gear 4
The small diameter inner toothed outer ring 7 is positioned in the axial direction by sandwiching the toothed portion of the small diameter inner toothed outer ring 7 between the disk surface and the washer 13.

The small-diameter internal tooth outer ring 7 is rotatably aligned and supported by a support protrusion 14 provided on the case 9 along the inner surface of the drum portion 71.

The support protrusions 10, 11, 12, and 14 are partially provided on the circumference.

Between the drum part 61 of the large-diameter internal tooth outer ring 6 and the drum part 71 of the small-diameter internal tooth outer ring 7, an internal expansion type brake is installed on the large-diameter internal tooth outer ring 6, and an external pressure type brake is installed on the small-diameter internal tooth outer ring 7. It is equipped with a pair of shoes 15, 15 that are selectively activated. 16 is a pin that pivotally connects one end of the shoes 15 and 15 to the case;
7 is a cam that controls the shoes 15, 15, and 18 is a shaft that operates the cam 17 from the outside, and is used to shift and rotate the cam 17 in the axial direction. Reference numerals 19, 20, and 21 designate a click ball and its engagement groove for moderating the shift position of the cam operating shaft 18, and 22 represents a ball pressing spring.

Next, to explain the operation, when the shoes 15, 15 are in the neutral position and the inner and outer toothed outer rings 6, 7 are not braked, the rotation of the driving shaft 1 and the sun gear 8 of the body is controlled by the rotation of the planetary gear 4 (41). 42), the inner toothed outer rings 6 and 7 are simply rotated idly, and are not transmitted to the driven shaft 2.

When the cam operating shaft 18 is turned to the right from the position shown in the figure, the cam 17 and the shoes 15, 15 engage, and the shoes 15, 15 both move inward to stop the small-diameter internal toothed outer ring 7 by braking. Then, the planetary stage gear 4 revolves while rotating along the small-diameter internal toothed outer ring 7, and the driven shaft 2 is rotated by the revolution.

Pull up the cam operating shaft 18 and remove the groove 21 and ball 19.
When cam 1 is engaged, turn it clockwise in the same way as above.
7 and the shoes 15, 15 change, the shoes 15, 15 spread outward, are brought into contact with the large diameter internally toothed outer ring 6, and stop the outer ring 6. In this case, the planetary gear 4 rotates and revolves around the large-diameter internal toothed outer ring 6 to rotate the driven shaft 2.

In other words, when the small-diameter internal toothed outer ring 7 is stopped, the driven shaft 2 rotates at a low speed, and when the large-diameter internal toothed outer ring 6 is stopped, the driven shaft 2 rotates at a high speed, making it possible to intermittent the transmission of rotational power and to perform two-speed shifting. be.

[Problem that the invention attempts to solve]

The above-mentioned planetary gear reducer with a transmission mechanism previously proposed by the present applicant has the structure and arrangement of the large and small inner toothed outer rings 6 and 7, support means for the case, and the inner toothed outer rings 6 and 7 and the planetary stage. Due to the meshing structure with the gear 4, if the inner tooth outer ring 7 is misaligned in the direction of the arrow X in FIG. Even if it is assumed that there is no phase shift during gear cutting of the large-diameter gear 41, the planetary stage gears 4A and 4B rotate in the directions of arrows a and b, respectively, and are pressed against the sun gear 8. At the same time, the teeth of the planet gear 4C and the sun gear 8 located ahead in the direction of deviation no longer come into contact with each other.

The same applies when there is a machining error when cutting the planetary gear 4 and an error in the position of the shaft 5 on the support frame 3.

When the driving shaft 1, that is, the sun gear 8 rotates under the above conditions, the load applied to the tooth surfaces of the sun gear 8 becomes uneven, and the tooth surface load may exceed the allowable surface pressure, causing tooth wear. There is a risk of noise, pitching, or tooth tip interference.

The purpose of the present invention is to solve the problem of unequal distribution of tooth surface load on the sun gear 8, which may occur in the planetary gear reducer with a speed change mechanism of the above configuration previously proposed by the present applicant. .

[Means for solving problems]

In order to achieve the above object, the present invention separates the large-diameter gear 41 and small-diameter gear 42 of each planetary stage gear 4, and connects the small-diameter gear 42 to the boss 411 of the large-diameter gear 41, as shown in FIG. Helical spline 2
A shaft 5 concentrically connected at 3 and passing through the boss 411
The planetary stage gear 4 is rotatably attached to the support frame 3 by the screws, the thrust receiving spring 24 is sandwiched between the large-diameter gear 41 and the small-diameter gear 42, and the shaft 5 and boss 411
The small diameter gear 42 is mounted with a washer 13 overlappingly attached to the end face of the
The summary is that we have covered the following.

[Action and effect]

When a load is applied to the sun gear 8 due to a meshing error between the sun gear 8 and the planetary stage gear 4 due to an accumulation error when assembling parts, the small diameter gear 42 with a large tooth surface load is affected by the action of the helical spline 23. As a result, the thrust receiving spring 24 is compressed while moving in the axial direction, and the phases of the large and small gears 41 and 42 are slightly shifted, so that the overload applied to the small diameter gear 42 is absorbed by the thrust receiving spring 24.

Therefore, the load applied to the tooth surface of the sun gear 8 is evenly distributed, and the surface pressure on the meshing surface can be kept below the allowable value. This has the effect of preventing abnormal noise from occurring.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a planetary gear reducer with a transmission mechanism previously proposed by the present applicant, FIG. 2 is a cross-sectional plan view thereof, and FIG. 3 is an enlarged longitudinal sectional front view of the main parts of the present invention. 1 is a driving shaft, 2 is a driven shaft, 3 is a support frame, 4 is a planetary stage gear, 41 is a large diameter gear, 411 is a boss, 42
is a small diameter gear, 5 is a shaft, 6 is a large diameter inner toothed outer ring, 61 is a drum part, 7 is a small diameter inner toothed outer ring, 71 is a drum part,
8 is the sun gear, 9 is the reducer case, 10, 11,
12 is a large diameter inner tooth outer ring support protrusion, 13 is a washer, 14
is a small diameter inner tooth outer ring support protrusion, 15.15 is a shoe,
16 is a shoe pivot pin, 17 is a shoe control cam,
18 is a cam operation shaft, 23 is a helical spline,
24 is the thrust receiving spring.

Claims (1)

[Claims for Utility Model Registration] A driving shaft 1 and a driven shaft 2 are arranged on the same axis,
Several planetary stage gears 4 are pivotally supported on a support frame 3 that is integral with the driven shaft 2, and one gear 41 of the planetary stage gear 4 is engaged with a sun gear 8 that is integral with the driving shaft 1. On the outer periphery of the stepped gear 4, cylindrical large and small inner toothed outer rings 6 and 7 that mesh with the respective gears 41 and 42 of the stepped gear 4 are arranged concentrically inside and outside, Centering and axial positioning are performed by support protrusions 10, 11, and 12 provided on the reducer case 9 along the
are aligned by the support protrusion 14 provided on the reducer case 9 along its periphery, and the small-diameter internal teeth are aligned by the disk surface of the planetary gear 4 and the washer 13 attached to the end surface of the gear 4 Axial positioning is performed by sandwiching the teeth of the outer ring 7, and an internal expansion type brake is installed on the drum portion 61 of the large diameter inner tooth outer ring 6 between the cylindrical large diameter inner tooth outer ring 6 and the small diameter inner tooth outer ring 7. In addition, in a reducer equipped with a pair of brake shoes 15, 15 and a brake shoe control cam 17 for selectively operating the drum part 71 of the small-diameter internal tooth outer ring 7 as an external pressure brake, each planetary stage gear 4 large diameter gear 41 and small diameter gear 42
Separately, the small diameter gear 42 is made into a large diameter gear 41.
The planetary gear 4 is rotatably attached to the support frame 3 by a shaft 5 passing through the boss 411, and a thrust shaft is connected between the large diameter gear 41 and the small diameter gear 42. Reception spring 2
A planetary gear reducer with a transmission mechanism in which a small-diameter gear 42 is held down by a washer 13 attached to the end face of the shaft 5 and the boss 411 in an overlapping manner.