CN201934624U - Plastic bevel gear - Google Patents

Abstract

The utility model provides a plastic bevel gear, which is capable of improving fatigue-resistant strength of tooth roots without affecting impact resistance performance thereof. The plastic bevel gear is characterized in that pressure angles of two sides of each tooth of the bevel gear are unequal, the surface with larger pressure angle of each tooth is a meshed surface, and the surface with smaller pressure angle of each tooth is a non-meshed surface. A reference circle module of the plastic bevel gear is unequal to a tooth height module, and the plastic bevel gear has the advantages of low vibration and noise, easiness in forming, corrosion resistance and the like. Compared with an existing plastic straight-toothed bevel gear, the plastic bevel gear is large in bearing capacity, small in volume, light in weight, long in service life and the like, and has enormous social and economic benefits since plastic gears have wide application prospect.

Description

A kind of plastics rounding bevel gear

Technical field

The utility model relates to the technical field of design of gears, specifically is a kind of plastics rounding bevel gear.

Background technique

Since 20th century, developed fiber nylon the thirties, plastic gear had obtained using widely.Compare with metal gear, friction is little, in light weight, noise is low because of having for plastic gear, corrosion-resistant, to advantages such as machining error are insensitive, and be widely used in every field such as weaving, printing and dyeing, papermaking, food, automobile, instrument and apparatus.

Bevel gears can be realized the motion between any two angle of intersection axles and the transmission of power.Spur bevel gear is again because of being easy to design, processing and installing, and extensive use on engineering.Studies show that gear teeth shape not only has influence on gear-driven kinetic characteristic, also will have influence on gear-driven dynamic property.Involute cone gear commonly used, its left and right sides profile geometry is symmetrical.But, when gear rotates,, cause the transmission performance of gear train assembly can not reach the best because the lubrication circumstances of engagement side and non-engagement side, meshing mechanism, bearing capacity is different.

The model utility content

Technical problem to be solved in the utility model provides a kind of plastics rounding bevel gear of improving the transmission performance of cone gear.

For solving the problems of the technologies described above, the utility model provides a kind of plastics rounding bevel gear, is characterized in: the pressure angle of the gear teeth both sides of this cone gear is unequal, and the bigger flank of tooth of pressure angle is Surface of action, and the less flank of tooth of pressure angle is non-Surface of action.

The flank profil curved surface generating principle of described cone gear is as follows: with r _BdMake the engagement side basic circle conical surface of plastics rounding bevel gear for the bottom surface radius, and exist the first generating plane Q and the described engagement side basic circle conical surface tangent, form line segment AD when the first generating plane Q and the described engagement side basic circle conical surface are tangent, wherein, point A is on the engagement side base cone bottom surface, and some D is the summit of engagement side base cone; When the first generating plane Q when the described engagement side basic circle conical surface is done nonslipping pure rolling, the track AA of some A ₁Be the engagement side flank profil curved surface of plastics rounding bevel gear.With r _BcMake the non-engagement side basic circle conical surface of plastics rounding bevel gear for the bottom surface radius, and exist the second generating plane P and the described non-engagement side basic circle conical surface tangent, form line segment BC when the second generating plane P and the described non-engagement side basic circle conical surface are tangent, wherein, point B is on the non-engagement side base cone bottom surface, and some C is the summit of non-engagement side base cone; When the second generating plane P when the described non-engagement side basic circle conical surface is done nonslipping pure rolling, the track BB of some B ₁Be the non-engagement side flank profil curved surface of plastics rounding bevel gear.

The utlity model has positive effect:

(1), the utility model proposes the design method that adopts different pressure angles, change modulus, big addendum coefficient in the both sides of the plastics system spur bevel gear gear teeth in order one to go on foot the transmission performance that improves cone gear to the greatest extent.

(2) characteristics of plastics rounding bevel gear of the present utility model are: i) by using the base cone of different bottom surfaces diameter, produce the tooth trace that pressure angle does not wait in the gear teeth both sides of plastics system spur bevel gear; Compared with prior art, as shown in Figure 5, flank profil of the present utility model both sides can reduce the volume and weight of gear when adopting the unequal pressure angle.Ii) adopt big addendum coefficient; Iii) the modulus of gear compound graduation circle is m, and the modulus at tooth depth position is m ', and m＞m '.The pressure angle of these plastics rounding bevel gear two lateral tooth flanks does not wait, and gets the large pressure angle flank of tooth as Surface of action, and the little pressure angle flank of tooth is as non-Surface of action.

(3) the utility model patent is according to the generation characteristics of plastics system Involute Straight-teeth Bevel Gear flank profil curved surface, characteristic in conjunction with variable pressure angle, change modulus, change addendum coefficient, the design philosophy of the plastics system of providing variable pressure angle, change modulus, big addendum coefficient spur bevel gear, and derive gear geometric parameter and size calculation formula.

(4) the utility model is compared with existing metallic Involute Straight-teeth Bevel Gear, has advantages such as vibration is little, noise is low, moulding is easy, corrosion-resistant.The utility model is compared with existing plastics system spur bevel gear, has that bearing capacity is big, volume is little, in light weight a, advantage such as the life-span is long.Because plastic gear has a extensive future, this model utility has huge social and economic benefit.

Description of drawings

Fig. 1 is the structural representation of plastics rounding bevel gear of the present utility model;

Fig. 2 is the big end tooth shape figure of the plastics rounding bevel gear among Fig. 1; Reference character among the figure: 1--top circle, 2--standard pitch circle, 3--root circle, 4-mesh tooth face, the non-mesh tooth face of 5-;

Fig. 3 is the generation schematic representation of the engagement side flank profil curved surface of plastics rounding bevel gear of the present utility model;

Fig. 4 is the generation schematic representation of the non-engagement side flank profil curved surface of plastics rounding bevel gear of the present utility model;

Fig. 5 is the contrast schematic representation of the profile of tooth 9 of the profile of tooth 8 of plastics rounding bevel gear of the prior art and plastics rounding bevel gear of the present utility model.

Embodiment

See Fig. 1-2, the profile of tooth of the plastics rounding bevel gear of present embodiment mainly comprises tooth top 1, tooth root 3, engagement side flank profil 4, non-engagement side flank profil 5 (large and small end tooth shape structure is identical).

Flank profil curved surface generating principle is as follows:

With r _BdMake the engagement limit basic circle conical surface of plastics rounding bevel gear for the bottom surface radius, and exist the first generating plane Q and the described engagement side basic circle conical surface tangent, form line segment AD when the first generating plane Q and the described engagement side basic circle conical surface are tangent, wherein, point A is on the engagement side base cone bottom surface, and some D is the summit of engagement side base cone; When the first generating plane Q when the described engagement side basic circle conical surface is done nonslipping pure rolling, the track AA of some A ₁Be the engagement side flank profil curved surface of plastics rounding bevel gear.

With r _BcMake the non-engagement side basic circle conical surface of plastics rounding bevel gear for the bottom surface radius, exist the second generating plane P and the described non-engagement side basic circle conical surface tangent, form line segment BC when the second generating plane P and the described non-engagement side basic circle conical surface are tangent, wherein, point B is on the non-engagement side base cone bottom surface, and some C is the summit of non-engagement side base cone; When the second generating plane P when the described non-engagement side basic circle conical surface is done nonslipping pure rolling, the track BB of some B ₁Be the non-engagement side flank profil curved surface of plastics rounding bevel gear.

The number of teeth of this cone gear, hold standard pitch circle modulus, big end tooth high mode, the big end pressure angle of graduated circle of engagement side, the big end pressure angle of graduated circle of non-engagement side to be respectively greatly: z, m, m ', α _d, α _cThe value of z meets the velocity ratio requirement; The value size of m, m ' is according to " the gear handbook is chosen or made by oneself as required; α _c=14 °～29 °; α _dSatisfy: 45 °＞α _d＞α _c

Described

Millimeter, wherein: d is the big end standard pitch diameter of cone gear, the d=mz millimeter is described

Millimeter.

The tip clearance coefficient of the addendum coefficient of the addendum coefficient of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface, the tip clearance coefficient of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface is respectively

Then

$c_c^{*}=h_{\mathrm{ad}}^{*}+c_d^{*}-h_{\mathrm{ac}}^{*}.$

The dedendum of the tooth of the addendum of the addendum of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface, the dedendum of the tooth of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface is respectively h _Ad, h _Ac, h _Fd, h _Fc, then

Millimeter,

Millimeter,

Millimeter,

Millimeter.

The root diameter of the root diameter of the tip diameter of the big end of described engagement side flank profil curved surface, the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface is respectively d _a, d _Fd, d _Fc, d then _a=d+2h _AdCos δ millimeter, d _Fd=d-2h _FdCos δ millimeter, d _Fc=d-2h _FcCos δ millimeter.

To wait bottom clearance, two crossed axis angles is that 90 ° Bevel Gear Drive is an example, and getting the big end parameter of cone gear is reference value, provides plastics system variable pressure angle, becomes modulus, the geometric parameter and the size formula of addendum coefficient spur bevel gear transmission greatly.

Table 1

Continuous table 1

Remarks: footnote 1 is represented small gear, and footnote 2 is represented gearwheel, and footnote d represents the gear meshing side, and footnote c represents the non-engagement side of gear.

Described " gear handbook: China Machine Press, 2004-2 the 2nd edition, No. the 09768th, Chinese depository library CIP digital core word (2000).Compare with existing plastics system spur bevel gear, have that bearing capacity is big, volume is little, in light weight a, advantage such as the life-span is long.Compare with existing metallic Involute Straight-teeth Bevel Gear, have advantages such as vibration is little, noise is low, moulding is easy, corrosion-resistant.Because plastic gear has a extensive future, this patent has huge social and economic benefit.

Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to mode of execution of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all mode of executions.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection domain of the present utility model.

Claims (7)

1. plastics rounding bevel gear, it is characterized in that: the pressure angle of the gear teeth both sides of this cone gear is unequal, and the bigger flank of tooth of pressure angle is Surface of action, and the less flank of tooth of pressure angle is non-Surface of action.

2. plastics rounding bevel gear according to claim 1 is characterized in that: the number of teeth of this cone gear, hold standard pitch circle modulus, big end tooth high mode, the big end pressure angle of graduated circle of engagement side, the big end pressure angle of graduated circle of non-engagement side to be respectively greatly: z, m, m ', α _d, α _c

The value of z meets the velocity ratio requirement;

The value size of m, m ' is according to " the gear handbook is chosen or made by oneself as required;

α _c＝14°～29°；

α _dSatisfy: 45 °＞α _d＞α _c

3. plastics rounding bevel gear according to claim 2 is characterized in that: described

Millimeter, wherein: d is the big end standard pitch diameter of cone gear, the d=mz millimeter.

4. plastics rounding bevel gear according to claim 3 is characterized in that: described

Millimeter.

5. plastics rounding bevel gear according to claim 4 is characterized in that: the tip clearance coefficient of the addendum coefficient of the addendum coefficient of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface, the tip clearance coefficient of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface is respectively Then $h_{\mathrm{ad}}^{*}=0.8~1.0,$ $1.0<h_{\mathrm{ac}}^{*}<1.4,$ $c_d^{*}=0.2~0.46,$ $c_c^{*}=h_{\mathrm{ad}}^{*}+c_d^{*}-h_{\mathrm{ac}}^{*}.$

6. plastics rounding bevel gear according to claim 5 is characterized in that: the dedendum of the tooth of the addendum of the addendum of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface, the dedendum of the tooth of the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface is respectively h _Ad, h _Ac, h _Fd, h _Fc, then

Millimeter, Millimeter,

Millimeter,

Millimeter.

7. plastics rounding bevel gear according to claim 6 is characterized in that: the root diameter of the root diameter of the tip diameter of the big end of described engagement side flank profil curved surface, the big end of described engagement side flank profil curved surface, the big end of described non-engagement side flank profil curved surface is respectively d _a, d _Fd, d _Fc, d then _a=d+2h _AdCos δ millimeter, d _Fd=d-2h _FdCos δ millimeter, d _Fc=d-2h _FcCos δ millimeter.

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