JPS604647A - Bearing system for reduction face gear - Google Patents

Abstract

PURPOSE:To shorten the width of a bearing system by bearing the force functioning from a gear onto the input shaft by means of a bearing system where two face gears integrated on the back are journaled to the input shaft. CONSTITUTION:An inner ring 8 is secured to the folding section 6b of input shaft 6 while an annular triangular groove 8a having top angle of 90 deg. is made in the outercircumference. Similarly, triangular groove corresponding to said triangular groove corresponding to said triangular groove 8a is made in the common inner diameter of integral gears 2, 3 and supported by the inner ring through a roller 9. Upon driving of input shaft 6, axial and radial forces are applied onto the folded section 6b and function in two perpendicular directions through the roller 9. Since the functioning points (p), (g) on the axis of input shaft are separated, the forces applied onto the input shaft 6 can be born without difficulty.

Description

DETAILED DESCRIPTION OF THE INVENTION A reduction gear that can obtain a large reduction ratio by combining four face gears is known, but this reduction gear has a bent part on the input shaft and has two gears (hereinafter referred to as All "face gears" will be abbreviated as "gears") are pivotally supported by this bent portion, so forces are applied in two directions to the human power shaft during driving. Since the reduction ratio is large, this force is large, but the bearing device 4 can withstand this force.
However, no suitable one has been developed. The present invention solves this problem.

Examples will be described with reference to the drawings. The cylindrical case 5 is provided with lids A and B at both ends. The human power shaft 6 has straight parts 6a and 6c having the same axis at both ends, and has a bent part 6b with a bending angle p in between, and is rotatably supported by the lid A by the straight part 6a. The exit shaft 7 is located on the extension line of the straight part 6c when the lid B
The inner end supports the free end of the input hall.

Gear 1 is prevented from rotating on the inner surface of lid A.

Gear 2 and gear 3 are integrated on their respective back surfaces and rotatably supported by bending portion 6b, and gear 2 meshes with gear 1. Gear 4 is fixed to output shaft 7 and meshes with gear 3. The above structure is already known.

The present invention is for supporting the integrated key 72.3 on the bend 6b. The inner ring 8 is inserted into the bent portion 6b and is doubled in size, and is provided with an annular triangular groove 8a having an apex angle of 90° on the outer periphery.

The rollers 9 have the same diameter and width and are inserted into the triangle 'h'l) 8a with an angular phase of 90° alternately.

The integral gears 2 and 3 have a triangular groove of the same shape corresponding to the triangular groove 8a on their common inner diameter, and are supported by the inner ring 8 via rollers 9. The holding fitting 10 is a ring-shaped member loosely inserted into the outer periphery of the inner ring, and has oval holes 10a formed at predetermined intervals, and holds the rollers inserted alternately into each in a treatment posture.

The present invention is configured as described above. Due to the driving of the human power shaft, two kinds of forces are applied to the bent portion 6b, one in the axial direction and the other in the radial direction, and these forces act through the roller 9 in two directions perpendicular to the center of the roller. The line of action and the axis of the input shaft intersect at two points p+g in FIG. 2, and a considerable distance is ensured between the points of action 1.8. Therefore, the force applied to the input shaft is easily supported. On the other hand, when a normal bearing is used, the width of the bearing must be increased out of balance with the overall design in order to reasonably support the force applied to the input shaft. That is, the thickness of the gears 2 and 3 had to be made thicker. The present invention is characterized in that this is not necessary and can be supported with a relatively short width without filling. In the above embodiment, the rollers are arranged in rows, but if it is necessary to further increase the strength, they may be arranged in multiple rows.

[Brief explanation of the drawing]

Figure 1 is a front view of the reducer, Figure 2 is a front view of the bearing device,
FIG. 3 is a perspective view of the holding fitting, and FIG. 4.5 is an explanatory view of installing the roller. 1, 2.3.4... 1st. Second. Third. 4th face gear, 5...case, 6...input shaft, 6b...
...Bent part, 7...Output shaft, 8...Inner ring, 8a
... Triangular groove, 9 ... Roller, 10 ... Holding fitting, 10a ... Oval hole, A, B ... Lid. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A cylindrical case with lids A and B on both ends, and two
An inclined bent part is provided between the two straight parts, and one of the straight parts is rotatably supported on the lid A, and an extension is rotatably supported on the lid B on the extension of the straight part. axis and
It consists of a first face gear fixed to the inner surface of the lid A, a second and third face gear that is pivotally supported on the bent part and integrated with each other on the back surface, and a fourth face gear fixed to the output shaft, @ In a face gear reducer in which gears 1 and 2 and gears 3 and 4 are engaged, an inner ring is inserted and fixed into the bent portion and has a triangular groove with an apex angle of 90° on the outer periphery; A triangular groove is provided on the common inner diameter of the second and third face gears corresponding to the groove, and a plurality of triangular grooves are inserted with alternating axes between the two corresponding triangular grooves with the same length and width. Laura and
A bearing device for a face gear reducer that supports second and third face gears, and includes an annular holding fitting loosely inserted on the outer periphery of the inner ring so as to be able to hold the above-mentioned "-" in a predetermined position.