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Gears and gearing apparatus

Inactive Publication Date: 2007-06-21
ENPLAS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] In view of the above problems, an object of the present invention is to provide firstly gears comprised of one and the other mutually engaged gears, and secondly a gearing apparatus capable of reducing noise generated when a pair of gears is engaged with each other and also, reducing an error in rotation transmission of the gears.

Problems solved by technology

As a result, the contact to the teeth of the mating gear can be soft and therefore, the contacting shock can be absorbed.

Method used

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  • Gears and gearing apparatus
  • Gears and gearing apparatus
  • Gears and gearing apparatus

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Experimental program
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second embodiment

[0064]FIG. 6 is a main part perspective view showing the shape of the tooth 1 of the gear G1. In this embodiment, the predetermined region A in the tooth flank is chamfered so that the configuration thereof is made to be inclined planes which extend from the one place in the tooth width direction on the crossing 8 of the one tooth flank 7 and the tooth tip surface 3 to both of the end faces of the tooth 1. Namely, chamfered portions 9a and 9b are formed, by cutting away from the one tooth flank 7 predetermined places in the tooth width direction on the crossing 8 of the one tooth flank 7 and the tooth tip surface 3 in triangular inclined planes, in this case, from a center portion 16 toward the involute curve portions on the end portion 5 and 6 sides on both sides.

[0065] According to such a shape, the configuration of the predetermined region A in at least the one tooth flank 7 of each tooth 1 can be formed such that the mating with the teeth (2) of the mating gear (G2) starts from ...

third embodiment

[0069]FIG. 9 is a main part perspective view showing the shape of the tooth 1 of the gear G1. In this embodiment, chipped portions 17a and 17b are formed so that the configuration of the predetermined region A in the tooth flank is made to be inclined planes which extend from the one place on the one tooth flank 7 to both of the end face sides toward the crossing 8 of the tooth flank 7 and the tooth tip surface 3. Namely, the chipped portions 17a and 17b are formed, by chipping off from the tooth flank 7 the triangular inclined planes which extend from a site 18 of the one place on the one tooth flank 7 to both of the end face sides toward the crossing 8 of the tooth flank 7 and the tooth tip surface 3.

[0070] According to such a shape, the configuration of the predetermined region A in at least the one tooth flank 7 of each tooth 1 can be formed such that the mating with the teeth (2) of the mating gear (G2) is started from the corner portion on the one end portion 5 side or the oth...

fourth embodiment

[0075]FIG. 13 is a main part perspective view showing the shape of the tooth 1 of the gear G1. In this embodiment, for the predetermined region A in the tooth flank, a curved surface 19 which gradually decreases the tooth thickness is formed from the one end face of the tooth toward the other end face thereof in the tooth width direction of the one tooth flank 7. Namely, the curved surface 19 is formed in a convex curved surface, and smoothly connects with parallel curves 22 between an involute curve 20 on the one end portion 5 side in the tooth width direction of the one tooth flank 7 and a curve 21 which modifies the tooth thickness of the tooth tip surface 3 on the other end portion 6 side with a modification amount p. At this time, a planar vision shape of the curved surface 19 viewed from above the tooth tip surface 3 of the tooth 1 in FIG. 13 is shown in FIG. 14, in which a curvature radius r of the curved surface 19 in the tooth width direction is sequentially increased from ...

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Abstract

In a gear G1 according to the present invention, which is provided with a plurality of teeth 1 to be mated with teeth of a mating gear to thereby transmit a rotational motion, a predetermined region A in at least one tooth flank 7 of each tooth 1 is formed in a configuration such that, from at least one place in a tooth width direction on a crossing 8 of the tooth flank 7 and a tooth tip surface 3, the mating with the teeth of the mating gear is started with the point contact or the line contact shorter than the total tooth width, and thereafter, is gradually shifted to the line contact so that the length of contact line 10 thereof is sequentially increased as the line contact moves from a tooth tip surface 3 side toward a tooth root side.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to gears and a gearing apparatus for transmitting a rotational motion between two associated shafts, i.e., from one to the other of two associated shafts, through a pair of gears which are engaged with each other so that teeth of the engaged gears are operatively mated with each other. More particularly, the present invention relates to gears and a gearing apparatus capable of reducing generation of noise during the rotational motion transmitting operation of a pair of gears engaged with each other, and also reducing an error in transmission of the rotational motion. [0003] 2. Description of the Related Art [0004] As gears in a conventional gearing apparatus, typically, gears called standard gears having symmetrical tooth profiles are used. In a combination of such standard gears, the tooth tip and the tooth root of each of teeth have identical tooth widths when measured in a direction ...

Claims

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Application Information

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IPC IPC(8): F16H55/00F16H55/17
CPCF16H55/0886F16H55/16Y10T74/19972Y10T74/19963F16H57/0006
Inventor OHMI, KENJIKAWAKAMI, YASUTAKA
Owner ENPLAS CORP
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