JPH0716052U - Gear structure - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the behavior during gear meshing and reduce vibration and noise. [Structure] A fitting groove 2 that reaches a root of a gear is formed on an outer periphery of a gear 1, and a rubber ring 3 is attached to the fitting groove 2 so as to have a diameter larger than a root circle of the gear 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gear structure that eliminates backlash between gears.

[0002]

[Prior art]

 As one method of reducing the noise caused by the meshing of gears, as disclosed in Japanese Patent Laid-Open No. 50655/1975, by interlocking two gears in parallel with a predetermined phase difference with another common gear, There is a model that eliminates backlash and reduces vibration and noise during engagement.

Alternatively, a rubber for absorbing vibration is attached to a side surface of a gear to reduce vibration caused by meshing of gears to reduce gear noise (see Japanese Utility Model Laid-Open No. 1-14861). ).

[0004]

[Problems to be solved by the device]

 However, such low-noise gears have problems that their structure is complicated, the number of parts is increased, their assemblability is not good, and that they are easily broken.

The present invention aims to solve such problems.

[0006]

[Means for Solving the Problems]

 Therefore, in this invention, a fitting groove reaching the root of the gear is formed on the outer periphery of the gear, and a rubber ring is attached to the fitting groove so that the diameter is larger than the root circle of the gear.

[0007]

[Action]

 The rubber ring mounted on the bottom of the tooth comes into contact with the tooth tips of the mating gear as the gear meshes, and elastically restrains the movement of the gear, dampening vibrations due to metal contact and significantly reducing gear mesh noise. It can be reduced.

[0008]

【Example】

 1 and 2 show an embodiment of the present invention, in which a fitting groove 2 extending over the entire circumference is formed on the outer periphery of the gear 1 at a substantially central portion in the tooth width direction. The groove bottom of the fitting groove 2 is deeper than the root circle connecting the tooth bottoms of the gear 1, and the groove width is sufficiently smaller than the tooth width of the gear 1 so that the transmission drive torque of the gear 1 is not affected. Is set to. Moreover, the cross-sectional shape of the groove bottom of the fitting groove 2 is formed in a semicircular shape.

A rubber ring 3 is attached to the fitting groove 2, and the outer diameter of the ring becomes larger than the root circle of the gear 1 when the rubber ring 3 is attached, and as shown in FIG. As described above, the thickness of the rubber ring 3 is appropriately set such that the compression ratio X (compression allowance) in the radial direction is approximately 30% or less in the meshing state with the counter gear 4.

The rubber ring 3 has a circular cross section, a rectangular cross section, or the like, and is mounted and fixed in the fitting groove 2.

Since the rubber ring 3 is installed around the bottom of the gear 1 in this manner, the gear teeth contact with the rubber ring 3 when meshing with the mating gear 4 and crush it. While rolling, the rubber ring 3 restrains the movement of the gear 4 at this time. Therefore, even if there is a meshing gap between the gears, the unstable behavior of the gear 4 is suppressed, and the control of the rubber ring 3 is suppressed. Since the vibration between the gears is damped by the vibrating action, the hammering sound and the vibration generated due to the meshing can be significantly reduced.

In this embodiment, the fitting groove 2 is formed in the center of the gear 1 teeth, but the invention is not limited to this, and the fitting groove 2 may be formed near both sides, for example.

[0013]

[Effect of device]

 As described above, according to the present invention, since the fitting groove reaching the root of the gear is formed on the outer periphery of the gear and the rubber ring is attached to the fitting groove so as to have a diameter larger than the root circle of the gear, the gear meshing is prevented. When mating, the movement of the tips of the mating gears is elastically restrained by the rubber ring, and because the rubber ring also acts as a damping function, it is possible to greatly reduce vibration and noise due to gear meshing. It is structurally very simple, no assembly is required, and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view showing a part of the meshed state of the gears.

[Explanation of symbols]

 1 Gear 2 Fitting groove 3 Rubber ring

Claims (1)

[Scope of utility model registration request] 1. A gear having a fitting groove formed on an outer periphery of the gear to reach a root of the gear, and a rubber ring being attached to the fitting groove so as to have a diameter larger than a root circle of the gear. Construction.