JPS59117951A - Speed reduction mechanism by gear - Google Patents

Abstract

PURPOSE:To obtain a gear with simple construction which eliminates backlash and can be applied to a gear transmission mechanism of various type, by combining gears made of different material so as to integrally use the gears as one gear. CONSTITUTION:Paired gears 11, 12 are prepared in an ordinary gear shape by a normaly used material of S45C or the like. A gear 13, prepared as an integral unit with the gear 12 by an elastic material in a tooth thickness larger than that of the gear 12, is provided. The gear 13 is formed such that its teeth are engaged to the teeth of the gear 11 by always being slightly deformed without providing backlash for the gear 11. When the gears 11, 12 are meshed, the gear 13 engages with the gear 11 always earlier before the gear 12 engages with the gear 11 by a distance of the larger thickness and rotates always in close contact, eliminating a rapid change of transmission torque without backlash of the gear in its engagement, thus smooth transmission is capable. This method can be applied also to a gear shape of various kind, and the backlash can be removed by providing an elastic material in the place of an oblique line part.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a mechanism for transmitting rotational torque and position using gears, in which a gear made of an elastic material is used in parallel with an ordinary gear having rigidity. This invention relates to a speed reduction mechanism using gears that eliminates punctures in the transmission mechanism.

[Prior art]

Conventionally, the method of eliminating banocranosis in gears is to use two identical gears and push one side with a spring, as shown in Figure 1, or, in the case of a bevel gear, to push it with spring tension, as shown in Figure 2. I was going. These methods complicate the structure of the mechanism;
This method is difficult to adopt in devices such as robots where the reduction mechanism needs to be lightweight and simple.
Items like the one shown in the diagram often do not fit into the regular interlocking teeth (this poses a problem in use).

[Purpose of the invention]

The purpose of the present invention is not to use the method described above, but to
The object of the present invention is to provide a speed reduction mechanism using gears that can be applied to various types of two-vehicle transmission mechanisms and eliminates puncture.

[Summary of the invention]

The present invention combines two gears with the same tooth shape made of two different materials, one made of a normal flying material and the other made of an elastic and wear-resistant material. By using them as a single gear, one performs the role of transmitting rotational torque and position as a normal gear, and the other has a spring action that constantly deforms the tooth profile during meshing in order to maintain bakutaku. It is characterized by having the role of eliminating looseness.

[Embodiments of the invention]

An embodiment of the present invention will be described using FIG. 6.

First, assume that there is a normal pair of gears (11, 12). The gears are made of commonly used materials such as 845C and have a regular tooth profile. This gear 11.12
It is assumed that the tooth thickness and center distance are set to certain values. A single gear 16 is provided.The gear 13 is the gear 1.
(For 1), the cranancy is 7'l (the teeth are always slightly deformed so that they touch each other.7) Moreover, gears 11 and 12 are rigid bodies, so they cannot normally transmit rotational torque and rotational position to each other. Yes, gear 16 is gear + 1
In the meshing of '12, gear 11 always meshes with gear 11 before gear 12 by the thicker tooth thickness, and because they always rotate in close contact, there is no interaction between the gears, there is no sudden change in the transmitted torque, and smooth transmission is possible. It is. Note that the rotational position accuracy is limited to a certain range by the gears 11 and 12.

The method of the present invention can be applied to various tooth profiles as shown in Figures 4a-D. Even in the case of a bevel gear, which conventionally had to be made as shown in FIG. 2, by providing the shaded portion with an elastic material by the above method, a method of eliminating backlash can be obtained.

A feature of the present invention is that it can also be applied to tooth profiles that conventional bacteraxes have, such as helical gears and helical gears.

〔Effect of the invention〕

Utilizing the present invention has the following effects.

1) The mechanism can be simplified.

2) Ordinary gears using rigid bodies can be set to regular mesh.

(Note) This method can also be used for gears with tooth profiles that are normally difficult to make backlash-free.

4) Since the teeth first come into contact with elastic teeth, gear noise can be reduced.

[Brief explanation of the drawing]

Figure 1 is a three-sided view of a conventional baracluff seal mechanism for spur gears, Figure 2 is a front view of a tension mechanism using a ratchet spring for bevel gears, Figure 6 is a principle diagram of the double gear of the present invention, and Figure 4 is It is a sketch of an example applied to various gears. 1.2.3... Regular gear 4... Spring 6.7... Bevel gear 8... Grip spring 11.12... Rigid body Gear 13 made from the material...
・・・・・・Elastic Body Gear Representative Patent Attorney Susuki 1) Ri Koyou t 2 Hitsuji 2 Mu Hiji J Figure// (,2) Figure 4 (b) (C) (I))

Claims (1)

[Claims] 1 In a single-tooth reduction mechanism, rotational torque, position [f
In addition to a rigid gear that transmits fi, it has a tooth profile that has the same module pitch as the rigid gear and has less puncture than the rigid gear, or conversely has a tooth profile with a wider tooth thickness and is also elastic. A speed reduction mechanism using gears that uses two gears made of a material with the same properties in parallel, and is characterized by the elimination of punctures in the meshing of the gears.