CN2308767Y

CN2308767Y - Low noise involute gear

Info

Publication number: CN2308767Y
Application number: CN 97237153
Authority: CN
Inventors: 何希良
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-06-04
Filing date: 1997-06-04
Publication date: 1999-02-24
Anticipated expiration: 2007-06-04

Abstract

The utility model relates to a low noise gear. The utility model is a special tooth form gear manufactured in a means of computer control, the tooth form takes on slightly middle convex form along the tooth direction of the gear (or the middle part of the slightly middle convex form is reserved with a straight section), when the utility model is engaged, the line contact of the existing gears is changed into point contact (or slight section contact), and therefore, the utility model achieves the purposes of steady transmission, noise reduction and whistle elimination. The utility model can be used for automobiles and motorcycles and can enhance the comfort and improve environmental protection.

Description

The low noise involute gear

The utility model relates to a kind of involute gear that is used for automobile, motorcycle-gear transmission, by along wheel tooth to profile modification be the gear of little camber (or little camber middle part keep one section straightway), reduce mechanical vibration and noise in the transmission with this.

At present, the noise and the high frequency that particularly produce in automobile, the motorcycle-gear transmission in the mechanical transmission are uttered long and high-pitched sounds, and seriously cause environmental pollution, have become automobile, a motorcycle-gear principal contradiction in producing.

At solving noise and engagement stationarity problem, people have carried out big quantity research, wherein profile of tooth being carried out correction of the flank shape is a kind of solution route, as: Chinese patent CN205671411 has announced a kind of arc tooth garden stud wheel, but this gear is the improvement to arc cylindrical gear of straight tooth or herringbone tooth garden stud wheel, Chinese patent CN87100119A has announced a kind of long-and-short-range involute equidistant-curve tooth-profile of gear, this gear can improve contact bearing capacity and resistance to flexure, be applicable to heavy load transmission, but do not have positive effect reducing noise.Also introduced a kind of type method of repairing through looking into " tractor and agricultural vehicle " February nineteen ninety-five " flank profil of cylindrical gear of straight tooth is repaiied the type noise reduction " literary composition, but it repaiies the type method is to repair type at the long cylinder of the whole tooth of the bidentate engaged section of tooth, and it is confined to medium load, and is totally different with the present invention.

The utility model purpose is: overcome existing gear noiose big, produce the defective of " uttering long and high-pitched sounds ", a kind of low noise involute gear is provided.

The structural feature of this low noise gear is: along wheel tooth to flank profil be little camber (or little camber middle part keep one section straightway).

The gear that the utility model provides can reduce noise, remove the basic reason utter long and high-pitched sounds than existing gear is because after the flank profil Surface of action is processed into little camber, the hard noise that hard extruding and collision produced of tooth and tooth when having reduced the engagement that angle error such as gear tooth alignment error, transmission shaft, Displacement error etc. cause.

Also because little camber on flank profil surface forms original involute gear in engagement process sealing triangular cavity becomes open triangle space, avoid gas mixture in the sealing triangular cavity, to form high pressure, also just avoided hyperbaric chamber to be extruded the high frequency jet howling of generation.

The two is avoided and eliminates promptly obtaining noise reduction.

Describe in detail below in conjunction with accompanying drawing: Fig. 1 is a gradually tooth punching wheel parts drawing of low noise; Fig. 2 is the A among Fig. 1 ₁-A ₁Sectional view; Fig. 3 is Figure 1A-A sectional view; Fig. 4 is little camber flank profil stereogram.

B is a teeth directional length among Fig. 2, and H is a tooth middle part maximum ga(u)ge, is reduced gradually to the two ends transverse tooth thickness by the tooth middle part, and transverse tooth thickness minimum in end be (H-2h), thus the face that forms of flank profil active section be little in convex globoidal, form during engagement and contact.

B among Fig. 3 is a teeth directional length, and H is a tooth middle part transverse tooth thickness, and the former straight line segment length of S for keeping reduced to two ends gradually by the S section, and minimum place transverse tooth thickness is (H-2h), and the flank profil active section is to keep one section cylinder in the middle of two sections cambered surfaces, is a mini line segment contact during engagement.

The cydariform profiling quantity of above-mentioned two kinds of profiles of tooth is all very little, between general h=0.01～0.08mm.

The process means of this low noise gear of manufacturing is: by the common gear making machine of computer control (as gear hobbing machine, gear shaping machine etc.) and with the special use technical measures such as cutter to realize this little camber profile of tooth.

This involute gear with noise reduction exchanges the contrast experiment with the homotype conventional gears under identical operating conditions, the minimizing mesh impact is arranged; Eliminate that high frequency is uttered long and high-pitched sounds and wait significantly reduction anti noise.This sample gear obtains the average positive effect that reduces by 3～5 decibels of noises in the test of Jinan group company of light cavalry, company of Jialing Group, Chang'an group company is on probation.

Claims

1, a kind of low noise involute gear is characterized in that: along transmission shaft teeth directional tooth middle part be little in convex, what promptly the flank profil active section formed is little camber cambered surface, the decide what is right and what is wrong flank profil line of face of the gear teeth still is involute.

2, involute gear according to claim 1, it is characterized in that: be little camber of one section straight line of two sections arc folders along the transmission shaft teeth directional, what be that the flank profil active section forms is convex globoidal among one section cylinder of two sections cambered surfaces folders little, and the decide what is right and what is wrong flank profil line of face of the gear teeth still is involute.