CN105485255A

CN105485255A - Dual lead type worm reducer having cavex gear teeth

Info

Publication number: CN105485255A
Application number: CN201510520663.0A
Authority: CN
Inventors: 吴泽春
Original assignee: YOUNG JIN WORM Co Ltd
Current assignee: YOUNG JIN WORM Co Ltd
Priority date: 2014-08-21
Filing date: 2015-08-21
Publication date: 2016-04-13
Anticipated expiration: 2035-08-21
Also published as: CN105485255B; KR101521791B1

Abstract

The invention provides a dual lead type worm reducer having cavex gear teeth. The cavex gear teeth have an improved structure of being capable of reducing gear tooth space, obtaining a high load transmission capability by increasing a gear tooth contact surface, enhancing gear tooth strength and rapidly forming an oil film, and thus are suitable for a high-load reducer with high efficiency. This should be attributed to that a dual-pitch type cavex shaft has a dual-pitch type cavex tooth shape, gear teeth of a gear unit have a plurality of ridges and a plurality of grooves, the thickness from a center line of each gear tooth of a slave gear unit to a first tooth surface is different from that from the center line of each gear tooth of the slave gear unit to a second tooth surface, the first tooth surfaces and the second tooth surfaces of the gear teeth with odd serial numbers have an equal radius of curvature and pressure angle, and the first tooth surfaces and second tooth surfaces of the gear teeth with even serial numbers have an equal radius of curvature and pressure angle.

Description

There is the double pitch worm retarder of Niemann worm wheel tooth

Invention field

The present invention relates to the double pitch worm retarder with Niemann worm wheel tooth.And, more particularly, the present invention relates to double pitch worm retarder, the Niemann scroll bar gear teeth wherein have can reduce gear teeth backlash, high loading transmission capacity is obtained by the surface of contact increasing the gear teeth, strengthen gear-tooth strength and the modified node method by forming heavy oil film raising life of product fast, thus be applicable to doing high load and high efficiency Large Reducer, because bidentate has bidentate apart from type Niemann worm tooth shape apart from type Niemann worm shaft, at bidentate apart from type Niemann worm tooth shape, center line to the first flank of tooth from the gear teeth is different from the width of center line to the second flank of tooth from the gear teeth, first flank of tooth of the gear teeth of odd indexed has equal radius of curvature and pressure angle with second flank of tooth, and first flank of tooth of the gear teeth of even-numbered has equal radius of curvature and pressure angle with second flank of tooth.

Background technique

Usually, the gap between the gear teeth processes in order to smoothness rotates, because if two gear teeth have same size, they can be stuck and can not rotate glibly.Correspondingly, the gear teeth are classified as the input gear teeth and export the gear teeth, and export the fine movement that the gear teeth produce because of gap and be called as " backlash ", and appear in all gear assemblies.

Recently, new high-tech industry comprises machine and the part that semiconductor applications needs to have highi degree of accuracy and efficiency.Due to very complicated and accurate operation, gear assembly has the gear teeth mutually rotating engagement fine, and gear assembly is used to accurate machine and part, and these gear assemblies inevitably stand backlash.But normal backlash can with abnormal backlash, namely abnormal backlash is increased by the wheel between cog gap caused of wear and tear, and weares and teares and caused by the lasting use of gear assembly.

Therefore, in order to solve abnormal clearance issues, the gap of the gear teeth be namely engaged with each other in gear assembly widen problem, the abnormal backlash produced due to wearing and tearing is controlled continuously apart from providing the gear teeth of different lead by bidentate, thus reduction gap, keep normal backlash but, the gear teeth in precision machinery and parts are only for very accurate and exquisite part, so use bidentate to be quite restricted apart from the worm component for a small amount of precision machinery and parts, and bidentate is apart from not also being applied to retarder as ordinary gear assembly, retarder is for converting High Rotation Speed to low speed rotation by motor.

Further, worm reducer, worm screw group are made up of intermeshing worm shaft and worm gear, compared to the ordinary gear assembly of common retarder, worm screw group needs careful calculating and exquisite machining from initial manufacture to completing, and uses so more difficult the bidentate distance needing highly accurate and exquisite technology.Therefore, when using bidentate distance, in worm reducer running, do not need accurate adjustment backlash.

Namely, bidentate is generally used for lathe, semiconductor tester and process equipment apart from worm gear type, and only for part limited in the precision machinery of state's manufactures such as Japan, Germany, Switzerland.And for the part of some lathes of Korea S, but it is known that do not have MANUFACTURER to develop, to sell or bidentate is used for the specific products of retarder by commercialization apart from worm screw.

" as far as possible the deceleration double pitch worm of precise hard_drawn tuhes backlash " to bidentate apart from the relevant prior art of worm reducer as one, claimant (2010,10,04) Korean patent No. is 10-0986802, it comprises: bidentate is apart from worm shaft, it is by making the central tooth of worm thread part different with the size of large pitch apart from, little helical pitch, makes that the ridge of worm thread part is thick to be increased along predetermined direction; Bidentate is apart from worm gear, and its helical thread portion has with bidentate apart from the central tooth distance of worm shaft same pattern, little helical pitch and large pitch, and engages apart from worm shaft with bidentate; Accurate adjustment housing, it is installed on the side of bidentate apart from worm shaft in rotary manner, rotates to make bidentate and moves linearly apart from worm shaft on the motor drive shaft of motor; Motor, it is installed on the opposite side of bidentate apart from worm shaft, and spaced apart apart from worm shaft with bidentate, can move linearly apart from worm shaft to make bidentate along motor drive shaft; And for holding the casing of bidentate distance worm shaft and worm gear.Therefore, rotate adjustment by performing in accurate adjustment housing, the abnormal backlash critically and constantly adjusting bidentate distance worm shaft and worm gear is possible, wherein, abnormal backlash produces in rotation during worm shaft and straight line motion at use bidentate, can cause and weares and teares and increase gap.

As the prior art that another and bidentate are relevant apart from worm reducer, " controlled the deceleration double pitch worm of backlash as far as possible by thin plate precision ", Korean patent No. is 10-0986802 (2010, 10, 04), it comprises: bidentate is apart from worm shaft, its ridge is thick to be increased along predetermined direction, by making the size of central tooth distance equal to have in ridge facing with each other in the worm thread portion of ridge and groove distance in the heart, the size of little helical pitch equals the distance of the intersection point of the baseline intersection point of left tooth limit and a ridge and the baseline of left tooth limit and next ridge, and the size of large pitch equal the right tooth limit of the right tooth limit of the baseline of a ridge and the baseline of next ridge and the baseline of next ridge intersection point between distance, bidentate is apart from worm gear, and its helical thread portion has with bidentate apart from the central tooth distance of worm shaft same pattern, little helical pitch and large pitch, and engages apart from worm shaft with bidentate, motor, it is installed on the side of bidentate apart from the axle of worm screw in a coupled manner, and spaced apart apart from worm shaft with bidentate, can move apart from worm shaft to make bidentate along motor drive shaft, casing, for holding bidentate apart from worm shaft and worm gear.Thin plate, it is to be installed on the opposite side of bidentate apart from the axle of worm screw with shell ground mode by taper needle bearing; And multiple thin plate has different thickness, each other bracing, and between two faces being configured in the shell of casing and thin plate.

But in such devices, the profile of tooth of worm gear is trapezoidal, trapezoidal is the profile of tooth of conventional worm gear, and worm gear is with the engagement of linear contact lay type, so can not transmit large load.Further, the pressure angle of surface of contact is right angle, so oiling agent is extruded and oil film is eliminated, and therefore, contact segment is easy to damage.

Further, when the gear teeth engage each other, be difficult to control the backlash between each worm shaft addendum surface, like this when backlash is too small, lubricate insufficient, gear tooth friction increases.Further, when backlash is excessive, gear teeth meshing is poor and gear is easily damaged.

Aforementioned be only intended to help understand background of the present invention, and be not intended to represent the present invention fall within the known correlation technique scope of those skilled in the art.

Invention is summed up

Therefore, the present invention makes after considering the problems referred to above occurred in correlation technique, and the object of the invention is to propose double pitch worm retarder, it has the Niemann worm wheel tooth of modified node method, easily suitably can adjust backlash, easilier than existing general worm gear transmit large load, easy reinforcement gear-tooth strength, easily form oil film fast, and make accurately control size become possibility by the profile of tooth making bidentate distance worm shaft and worm gear, in this profile of tooth, ridge is thick to be increased along predetermined direction, in Niemann wheel flute profile, the flank of tooth from center line to side from from center line to the thickness of opposite side be different, and the gear teeth thickness between two flank of tooth increases towards another face successively by one.

In order to achieve the above object, according to an aspect of the present invention, provide the double pitch worm retarder with the Niemann turbine gear teeth, comprise: bidentate is apart from Niemann worm shaft, they are different with from the width of gear teeth center line to the second flank of tooth from gear teeth center line to the first flank of tooth, first flank of tooth of the gear teeth of odd indexed has equal radius of curvature and pressure angle with second flank of tooth, the equal radius of curvature that first flank of tooth of the gear teeth of even number sequence number has and pressure angle, and second flank of tooth of the gear teeth of second flank of tooth of the gear teeth of odd indexed and even number sequence number has equal radius curve and pressure angle, and bidentate is apart from worm gear, it rotates with the gear teeth of bidentate distance Niemann worm shaft and engages, wherein, at bidentate apart from Niemann worm shaft, the radius of curvature of second flank of tooth and pressure angle than first flank of tooth radius of curvature and pressure angle large, first flank of tooth of the gear teeth and second flank of tooth are all circular, and large from the thickness of center line to the first flank of tooth from the Thickness Ratio of center line to the second flank of tooth.

In the gear teeth, from gear teeth center line, the pressure angle of second flank of tooth may be larger than the pressure angle of first flank of tooth, and the pressure angle of second flank of tooth of the pressure angle of first flank of tooth of the gear teeth of odd indexed, the pressure angle of first flank of tooth of the gear teeth of even number sequence number, the pressure angle of second flank of tooth of the odd indexed gear teeth and the even number sequence number gear teeth can be equal respectively.

The pressure angle of first flank of tooth and second flank of tooth can be in the scope of 21 to 23 degree.

According to each axial angle modulus of the gear teeth, the radius of curvature of each profile of tooth can meet the scope listed in following table.

Modulus (Ma)	The scope (R) of radius of curvature (mm)
		Ma1～Ma2	R8～R11
Ma2～Ma3	R11～R15
		Ma3～Ma4	R15～R19
Ma4～Ma5	R19～R25
		Ma5～Ma6	R25～R29
Ma6～Ma7	R29～R35
		Ma7～Ma8	R35～R39
Ma8～Ma9	R39～R45
		Ma9～Ma10	R45～R49
Ma10～Ma11	R49～R55
		Ma11～Ma12	R55～R59
Ma12～Ma13	R59～R65
		Ma13～Ma14	R65～R69
Ma14～Ma15	R69～R75
		Ma15～Ma16	R75～R80

According to each axial angle modulus of the gear teeth, the variable range of the bidentate distance of each profile of tooth can meet the scope listed in following table.

Modulus (Ma)	The variable range (mm) of bidentate distance
		Ma1～Ma2	0.01～0.25
Ma2～Ma3	0.25～0.35
		Ma3～Ma4	0.35～0.4
Ma4～Ma5	0.4～0.5
		Ma5～Ma6	0.5～0.6
Ma6～Ma7	0.6～0.7
		Ma7～Ma8	0.7～0.8
Ma8～Ma9	0.8～0.9
		Ma9～Ma10	0.9～1.0
Ma10～Ma11	1.0.～1.1
		Ma11～Ma12	1.1～1.2
Ma12～Ma13	1.2～1.3
		Ma13～Ma14	1.3～1.4
Ma14～Ma15	1.4～1.5
		Ma15～Ma16	1.5～1.6

Bidentate can be SCM415 apart from the material of Niemann worm shaft.

The dedendum of the tooth of the gear teeth is all more than or equal to the addendum of the gear teeth.

Because center line to the first flank of tooth from the gear teeth is different from the thickness of center line to the second flank of tooth from the gear teeth, and the thickness that two flank of tooth limit increases along second direction, so easily can adjust the backlash of the gear teeth be engaged with each other.

Further, this retarder has: bidentate is apart from Niemann worm shaft, and it has the Niemann worm tooth shape of two female flank of tooth; Bidentate is apart from worm gear, it has general profile of tooth, and introduce the linear contact lay with worm shaft, but, when bidentate of the present invention engages apart from turbine apart from worm shaft with bidentate, introduce gear teeth face contact each other, so the ability of transmitted load is improved, efficiency is improved, so this retarder is applicable to doing high loading, high efficiency worm speed-down equipment.

Further, according to the present invention, the end portion width of the gear teeth is larger than the end portion width of common profile of tooth or involute profile, so the intensity of the gear teeth improves.Further, due to the structural feature of face contact type Niemann worm tooth shape, interface pressure dihedral becomes bending surface of contact, so the flank of tooth making oiling agent be retained in worm thread portion is not extruded, and oil film can be formed fast.In addition, compared with the helical thread portion of existing worm screw, heavy oil film can be formed.

Further, because bidentate is apart from the use of worm gear, accurate size Control is possible.

Brief Description Of Drawings

When considered in conjunction with the accompanying drawings, other advantages of above and other objects of the present invention, characteristic sum can more clearly be understood in the following detailed description, wherein:

Fig. 1 shows and is equipped with the structure of bidentate of the present invention apart from the retarding device of type Niemann worm shaft.And

Fig. 2 is the enlarged view of gear tooth portions of the present invention.

Detailed description of the invention

The double pitch worm retarder with Niemann worm wheel tooth of the present invention has the ability of excellent transmitted load, and improves intensity, so it is applicable to doing high loading, high efficiency retarding device, and the retarder of retarding device is used in here illustratively.

With reference to Fig. 1 and 2, according to embodiments of the invention, the double pitch worm retarder with Niemann worm wheel tooth comprises: bidentate is apart from Niemann worm shaft 10, it is from the gear teeth 110, 120, the centre line L 1 of 130 and 140, L2, L3 is different from the width of second flank of tooth with L4 to the first flank of tooth, first flank of tooth and second flank of tooth of the gear teeth of odd indexed have equal radius of curvature R and pressure angle, first flank of tooth of the gear teeth of even number sequence number has equal radius of curvature and pressure angle, the radius of curvature of second flank of tooth and pressure angle are greater than radius of curvature and the pressure angle of first flank of tooth, first flank of tooth and second flank of tooth are circular, from center line L1, L2, the thickness of L3 and L4 to the second flank of tooth is greater than from center line L1, L2, the thickness of L3 and L4 to the first flank of tooth, and the thickness jointly to be limited by first flank of tooth and second flank of tooth increases along second direction, and bidentate is apart from worm gear 20, it rotates with the gear teeth 110,120,130 and 140 and engages..

In detail, gear unit 100 has multiple gear teeth, the gear teeth have multiple ridge and multiple groove, and in the following description, the gear teeth being odd-numbered line corresponding to ridge are called as first and third round tooth 110 and 130, and are called as second and fourth round tooth 120 and 140 corresponding to the gear teeth that ridge is even number line.

The radius of curvature of first flank of tooth of first flank of tooth of the first wheel tooth 110 and the tooth 130 of the 3rd gear and equal (the θ 1=θ 5 of pressure angle, R1=R5), and first wheel tooth 110 second flank of tooth and second flank of tooth of the 3rd wheel tooth 130 there is equal radius of curvature and pressure angle (θ 2=θ 6, R2=R6).

First flank of tooth of second gear teeth 120 and first flank of tooth of fourth round tooth 140 have equal radius of curvature and pressure angle (θ 3=θ 7, R3=R7), and second the gear teeth second flank of tooth and second flank of tooth of fourth round tooth 140 there is equal radius of curvature and pressure angle (θ 4=θ 8, R4=R8).

In gear unit 100 of the present invention, first, second, third and fourth gear teeth 110, 120, pressure angle (the θ 1 < θ 2 larger than the pressure angle of first flank of tooth of second flank of tooth of 130 and 140, θ 3 < θ 4, θ 5 < θ 6, θ 7 < θ 8), and first, second, third and fourth gear teeth 110, 120, radius of curvature (the R1 < R2 larger than the radius of curvature of first flank of tooth of second flank of tooth of 130 and 140, R3 < R4, R5 < R6, R7 < R8).

In the first, second, third and fourth gear teeth 110,120,130 and 140, from thicker (the t2 > t1 of Thickness Ratio to the second flank of tooth thickness of center line L1, L2, L3 and L4 to the first side, t4 > t3, t6 > t5, t8 > t7).

The vicissitudinous tooth pitch of gear unit 100 tool of the present invention, the thickness of the gear teeth namely limited by first flank of tooth and second flank of tooth is increased (the little tooth pitch of large tooth pitch >) successively by the first side direction second side.

But the centre tooth of the gear teeth 110,120,130 and 140 is apart from having identical width (A=B=C).Centre line L 1, L2, L3 and L4 are the vertical reference lines of the centre tooth distance for measuring the gear teeth 110,120,130 and 140.

Namely, in gear unit 100 of the present invention, the thickness (T1 < T2 < T3 < T4) that two flank of tooth of the thickness < fourth round tooth 140 that two flank of tooth of the thickness < third round tooth 130 that two flank of tooth of thickness < second gear teeth that two flank of tooth of first gear teeth 110 limit limit limit limit, and the centre line L 1 of the gear teeth 110,120,130 and 140, the gap between L2, L3 and L4 are identical.

Further, in gear unit 100 of the present invention, as mentioned above, from center line L1, the thickness of Thickness Ratio to the first flank of tooth of L2, L3 and L4 to the second flank of tooth is large.Namely, first flank of tooth of second gear teeth 120 is thicker than second flank of tooth of first gear teeth 110, first flank of tooth of third round tooth is thicker than second flank of tooth of second gear teeth 120, and first flank of tooth of fourth round tooth 140 (t1 < t2 thicker in second flank of tooth of the 3rd wheel tooth 130, t2 < t3, t3 < t4, t4 < t5, t5 < t6, t6 < t7, t7 < t8).

The pressure angle of first flank of tooth and second flank of tooth is in the scope of 21 to 23 degree.

First flank of tooth of the gear teeth 110,120,130 and 140 and second flank of tooth are distinguished toward each other, and the flank of tooth of the gear teeth 110,120,130 and 140 is circular, and when engaging with worm gear to make gear unit, the flank of tooth of the gear teeth introduces mutual face contact.

First flank of tooth and second flank of tooth of the odd indexed gear teeth and the even number sequence number gear teeth have equal radius of curvature and pressure angle respectively.

In the gear teeth 110,120,130 and 140, the distance of dedendum of the tooth namely from groove bottom to pitch circle is equal to or greater than addendum, the distance (h1 >=h2) namely between end face and pitch circle, and dedendum of the tooth can be 1.25 times of modulus and taller and bigger than tooth top.

The reference number " 13 " do not listed above represents that motor 13 makes bidentate rotate apart from worm shaft 10.

Use SCM415 the most stable, SCM415 is for the special steel of bidentate apart from worm shaft 10, and this material is except having high hardness, also has strong shock resistance and high tensile.

In worm gear, comprise bidentate apart from worm gear 20, as mentioned above, bidentate manufactures bidentate apart from Niemann worm apart from the helical thread portion of worm gear 20, and PCD (pitch diameter) is not with reference to nodel line, the nodal section manufacture intersected each other by large tooth pitch and little tooth pitch.

The variable range of the bidentate distance of variable gear distance and radius of curvature are as shown in Table 1 below.

[table 1]

In Table 1, modulus is classified based on axial angle, and has different R and bidentate apart from variable.

List the scope of the R of the profile of tooth with each modulus in table 1, when R is less than R8, radius of curvature is too little, and is difficult to gear hob processing tooth and the reduction of the intensity of the gear teeth, so be difficult to apply to high loading, high efficiency retarder.On the contrary, when R is greater than R80, the size of the gear hob of the processing gear teeth also wants proportional increase, like this, is difficult to install gearwheel hobboing cutter and manufactures the gear teeth with gearwheel hobboing cutter.

In addition, in gear unit 100, radius of curvature is determined by axial angle modulus, and according to each axial angle modulus, tooth pitch changes in the scope of 0.01 ~ 1.6 millimeter.

Bidentate distance is 0.01 ~ 1.6 millimeter of range, but when bidentate is apart from time less than lower limit (0.01 millimeter), not just that a bidentate is almost identical with ordinary gear apart from gear, so be difficult to produce bidentate to adjust backlash apart from effect (accurate dimension control action), or when bidentate is apart from larger than CLV ceiling limit value (1.6 millimeters), the varied in thickness of ridge is excessive, so profile of tooth is difficult to engagement.

But owing to being circular at the surface of contact of profile of tooth, the pressure angle of surface of contact maintains in the identical level of 21 ~ 23 °, but bidentate is proportional to modulus value apart from variable.

Because valuable two flank of tooth of gear teeth tool of the present invention are circular, and in Niemann worm, bidentate has general profile of tooth and service line contact apart from worm gear, but when bidentate engages apart from worm gear apart from worm shaft with bidentate, this gear teeth lead-in surface contacts, so the ability of transmitted load is improved and efficiency is improved; Therefore, these gear teeth are applicable to requiring high loading and high efficiency worm reducer.

Further, according to the present invention, at bidentate apart from Niemann worm tooth shape, because center line to the first flank of tooth from the gear teeth has different width from center line to the second flank of tooth from the gear teeth, first flank of tooth and second flank of tooth of the odd indexed gear teeth have equal R and pressure angle, and first flank of tooth and second flank of tooth of the even number sequence number gear teeth have equal R and pressure angle, and gear teeth backlash is reduced.

Further, according to the present invention, the end portion width of the gear teeth is larger than the end portion width of common profile of tooth or involute profile, so the intensity of the gear teeth improves.In addition, due to the structural feature of face contact type Niemann worm tooth shape, bending surface of contact is caused at interface pressure angle, so oiling agent is retained on gear unit 100 and is not extruded, and oil film can be formed fast.In addition, compared with the gear unit 100 with existing worm shaft, heavy oil film can be formed, and accurate numerical control can realize.

Although preferred embodiment of the present invention has been described with purpose of illustration, it should be appreciated by those skilled in the art, various amendment, increase and replacement and not depart from scope and spirit of the present invention disclosed in claims be possible.

Claims

1. there is the double pitch worm retarder of Niemann worm wheel tooth, comprising:

Bidentate is apart from Niemann worm shaft, they are different from from the width of gear teeth center line to the second flank of tooth from gear teeth center line to the first flank of tooth, first flank of tooth and second flank of tooth of the gear teeth of odd indexed have equal radius of curvature and pressure angle, the equal radius of curvature that first flank of tooth of the gear teeth of even number sequence number has and pressure angle, and second flank of tooth of the gear teeth of odd indexed has equal radius of curvature and pressure angle respectively with second flank of tooth of the gear teeth of even number sequence number;

Bidentate is apart from worm gear, and it rotates with the described gear teeth and engages,

Wherein, at described bidentate apart from Niemann worm shaft, the radius of curvature of described second flank of tooth and pressure angle than the radius of curvature of described first flank of tooth and pressure angle large, described first flank of tooth and described second flank of tooth of the described gear teeth are circular, large to the thickness of described first flank of tooth from described center line to the Thickness Ratio of described second flank of tooth from described center line, and the thickness of described first flank of tooth and described second flank of tooth restriction increases along second direction.

2. retarder according to claim 1, wherein, in the described gear teeth, from the center line of the described gear teeth, the pressure angle of described second flank of tooth is larger than the pressure angle of described first flank of tooth, and

The pressure angle of second flank of tooth of the pressure angle of first flank of tooth of the pressure angle of first flank of tooth of the gear teeth of odd indexed, the gear teeth of even number sequence number, the pressure angle of second flank of tooth of the odd indexed gear teeth and the even number sequence number gear teeth is equal respectively.

3. retarder according to claim 1, wherein, described first flank of tooth of the described gear teeth and the pressure angle of described second flank of tooth are in the scope of 21 to 23 degree.

4. retarder according to claim 1, wherein, according to the different axial angle modulus of the described gear teeth, the radius of curvature of profile of tooth meets the scope listed in following table.

5., according to retarder according to claim 1, wherein, according to the different axial angle modulus of the described gear teeth, the variable range of the bidentate distance of profile of tooth meets the scope that following table is listed.

6. retarder according to claim 1, wherein, described bidentate is SCM415 apart from a kind of material of Niemann worm shaft.

7. retarder according to claim 1, wherein, the dedendum of the tooth of the described gear teeth is more than or equal to the addendum of the described gear teeth.