JPS60201145A - Vibrationless speed changer - Google Patents

Abstract

PURPOSE:To prevent a vibration, by placing the center of gravity of an intermediate gear on the axis of a base shaft, and using gears which have their teeth cut so that the ends of the traces of the mutually engaged teeth coincide with each other and the modules at the ends of the teeth are equal to each other. CONSTITUTION:Despite a very small difference (e) between the locations of pitch cone vertexes P1, P2 of a pair of gears G1, G2, these gears are engaged with each other near the ends of their tooth traces most distant from the pitch cone vertexes. Since the intermediate gear G2, G3 has its center of gravity on the axis of a base shaft, the gear performs a smooth precession. Because the center of gravity and a point of bending are made coincident with each other, a bearing is not overstrained, so that a vibration is prevented.

Description

[Detailed Description of the Invention] Four face gears (hereinafter referred to as "gears") are arranged in parallel motion, and one integrated gear and two middle gears are made to perform a sliding motion, A speed increasing device 4 that obtains a large gear ratio is known (Japanese Patent Application No. 198748-1987).
. However, in the known gear, the center of gravity of the intermediate gear, which has gear surfaces on both sides and rotates on the bending shaft, is located at a position +19 deviated from the bending point of the bending shaft axis. This may cause strain and cause vibration. In order to improve this problem, the present invention relates to a transmission in which the bending point and the center of gravity are aligned.

First, a conventional embodiment will be explained with reference to FIG. 1, and its drawbacks will be clarified. The input shaft 5 includes a base shaft 5a and a bent shaft 5b bent at a bending point Z, and is supported by the case C by the base shaft 5a. The output II%+16 is supported by the case C on the same axis as the base shaft 5a.

The gear G] is rotatably supported on the base shaft 5a, and is prevented from rotating on the case C by a bolt 7. Gear C4 is fixed to output shaft 6. The intermediate gear G23 is formed by integrating the gear G211 that meshes with the gear G1 (and the gear G3 that meshes with the gear G4) back to back, and is rotatably supported on the bend 1i115b.Since the intermediate gear G23 is configured as described above, the gear G1 , C2's pitch cone apex and gear (,3, G4's pitch cone apex overlap toward bending point Z.

Further, the intermediate gear G2-3 performs a sliding motion with the bending point Z as a fixed point. However, the center of gravity W of the intermediate gear G23 is located at a position 14 deviated from the new curve point Z on the bending axis.

That is, the center of gravity W moves circularly on a conical surface with the bending point Z as the apex, and the centrifugal force causes irregularity in the rotation of the input shaft.

In contrast, in the present invention, point P is made to coincide with point W. The idea is to first move the base axis of gear Gl in parallel, reposition point W on the base axis, and move both gears (, l,
Make sure the pitch lines of G2 overlap.

In this case, the bending point Z shown in FIG. 2 overlaps with the center of gravity W. Also, the pitch cone apex P1 of gear Gl and the same apex P2 of gear G2 are on the pitch line of gear G1 by an amount e.
To be in ul position. At the same time, both gears Gl and G2 pitch line upper tooth sushi ff: 2f 15+ lL<2, similarly only C is 1Ir
Rank J. 1) Even though the modules of the tooth lead wax 1 are the same, normal engagement cannot be achieved due to the misalignment of e. Therefore, in this book fIll14, 1 mountain j koto sushi M + l
fl?-<+1. Adjust the length of the sushi.
L/ and its tooth profile fl, 1 are geared so that both modules match. In order to make the tooth trace ends coincide, either side may be expanded or contracted, but as an example, FIG. Indicated. In this case too, P
I, P2 still have a gap of e. intermediate gear G23
The relationship between and gear G4 is also the same. In the figure, the description of G4 is omitted.

The present invention is configured as described above. In Fig. 3, a pair of gears Gl and G2 have an oscillation position of e between the pitch circular vertebra vertices PI and P2, so geometrically accurate meshing cannot be achieved. However, the value of e is extremely small. .

Also, the mesh is the tooth trace I that is farthest from the pitch cone apex.
fljj Because it is carried around H3, the deviation f of e
291 is of a level that can be seen clearly, and in practice it operates without any problems. Since the center of gravity of the intermediate gear G23 is on the base axis line, the intermediate gear G23 smoothly performs the sliding motion. This is a feature of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a front view of a known device, FIG. 2 is a detailed explanatory diagram of the present invention, and FIG. 53 is an old AN diagram of the present invention. Gl, G2. G3. G4...gear, G23...
...Intermediate gear, 5...Input shaft, 5a...Base shaft,
5b...-new song axis, 6...output f咄, 7...
Bolt, C...Case, W...Center of gravity, Z...Bending point, circle, P2...Pitch cone apex. Special Applicant Sanwa Tekki Co., Ltd. Figure 1 7, ) 23 Figure 3

Claims (1)

[Claims] An input shaft that is connected to the base shaft and has a bending shaft, an output that is coaxial with the base shaft, a gear G1 that is rotatably supported on the base shaft and prevented from rotating on the case, and a gear G1 that is fixed to the output llll11. Gear G4 and gear G2 that mesh with gear Gl
In the transmission device, the center of gravity of the intermediate gear is located on the lia+b axis, and the tooth thread ends of the meshing teeth are A non-vibration speed device characterized by using gears that are geared so that they match and have the same tooth profile modules.