CN101504054A

CN101504054A - Transmission gear of automobile instrument motor

Info

Publication number: CN101504054A
Application number: CNA200810234341XA
Authority: CN
Inventors: 金闻瑞
Original assignee: WUXI MCROT MOTOR CO Ltd
Current assignee: WUXI MCROT MOTOR CO Ltd
Priority date: 2008-11-18
Filing date: 2008-11-18
Publication date: 2009-08-12
Anticipated expiration: 2028-11-18
Also published as: CN101504054B

Abstract

The invention discloses a transmission gear of an automotive instrument motor, which comprises a motor driven pinion, a middle gearwheel, a middle pinion and an output gearwheel. The middle gearwheel and the middle pinion are coaxial gears, the driven pinion and the middle gearwheel are meshed, the middle pinion and the output gearwheel are meshed, the driven pinion and the middle pinion have the same outline structure and are named as pinions, the middle gearwheel and the output gearwheel have the same outline structure and are named as gearwheels, the outline lines of the pinions are curves which are symmetrical along an axis OA and consist of six sections of tangential circular arcs, and the outline lines of the correspondingly meshed gearwheels are curves which are symmetrical along an axis OE and consist of five sections of tangential circular arcs; and the pinions and the gearwheels are meshed to work. The transmission speed ratio of the transmission gear is large and can reach 30 to 1; the tooth number of the pinions can be six so as to ensure a small integral structure; and when the gearwheels and the pinions are in meshed transmission, the transmission is smooth, and the vibration and noise are low.

Description

The driving gear of automobile instrument motor

Technical field

The invention belongs to gear transmission technology, particularly a kind of automobile instrument motor is with gear-driven flank profil structure.

Background technique

Gear transmission is an a kind of basic type of belt drive most widely used in all kinds of mechanical transmission.It is that the gear teeth that the gear teeth by driving wheel promote follower successively come transmitting movement and power, can transmit the rotation motion between parallel axes, concurrent aces and the crossed axis of any outfit.The flank profil line of gear mainly contains involute, circular arc, two circular arc, cycloid and accurate hyperbola, and involute gear has rotation than constant, the characteristics that noise dither is little, and still the little tooth number of teeth is minimum is 12 teeth, makes gearing down system architecture size become very big.It is 6 that standard timepiece allows the little tooth number of teeth with the Machining Modified Cycloidal Gears profile of tooth, but the transmission process reduction speed ratio is non-constant, can cause shake and noise.

Summary of the invention

The object of the present invention is to provide a kind of driving gear of automobile instrument motor, this driving gear is active input speed height not only, and output speed is low, and transmission speed ratio is big, and overall structure is little, and transmission requires steadily, and vibration and noise are little.

Realize that technical solution of the present invention is: a kind of driving gear of automobile instrument motor, comprise the motor driven small gear, gear broad in the middle, intermediate speed pinion and output gearwheel, gear broad in the middle and intermediate speed pinion are in-line gears, driving pinion and gear broad in the middle are meshed, intermediate speed pinion and output gearwheel are meshed, the flank profil structure of driving pinion and intermediate speed pinion is identical, be referred to as small gear, gear broad in the middle is identical with the flank profil structure of output gearwheel, be referred to as gearwheel, the flank profil line of small gear is the curve along axes O A symmetry, constitute by first to the 6th section tangent circular arc, the flank profil line of the gearwheel of engagement is the curve along axes O E symmetry relatively, is made of the 7th to the 11 section tangent circular arc; When small gear and gearwheel joggleword, the flank profil line that small gear participates in engagement is first to the 3rd section circular arc, and the flank profil line that gearwheel participates in engagement is the 7th, eight a section circular arc.

The present invention compared with prior art, its remarkable advantage is: (1) transmission speed ratio is big, can reach 30 to 1; (2) number of teeth of small gear can be 6, so just can guarantee that overall structure is little; (3) stable drive during large and small meshed transmission gear, vibration and noise are little.

Below in conjunction with accompanying drawing the present invention is described in further detail.

Description of drawings

Fig. 1 is the overall structure of automobile instrument motor driving gear of the present invention.

Fig. 2 is the small gear flank profil structure of automobile instrument motor driving gear flank profil structure of the present invention.

Fig. 3 is the gearwheel overall structure of automobile instrument motor driving gear flank profil structure of the present invention.

Fig. 4 is the gearwheel flank profil structure of automobile instrument motor driving gear flank profil structure of the present invention.

Embodiment

In conjunction with Fig. 1, Fig. 2 and Fig. 4, the driving gear of automobile instrument motor of the present invention, comprise motor driven small gear 12, gear 13 broad in the middle, intermediate speed pinion 14 and output gearwheel 15, gear 13 broad in the middle and intermediate speed pinion 14 are in-line gears, driving pinion 12 and gear broad in the middle 13 are meshed, intermediate speed pinion 14 and output gearwheel 15 are meshed, the flank profil structure of driving pinion 12 and intermediate speed pinion 14 is identical, be referred to as small gear, gear 13 broad in the middle is identical with the flank profil structure of output gearwheel 15, be referred to as gearwheel, the flank profil line of small gear is the curve along axes O A symmetry, by first to the 6th section tangent circular arc 1,2,3,4,5,6 constitute, and the flank profil line of the gearwheel of engagement is the curve along axes O E symmetry relatively, by the 7th to the 11 section tangent circular arc 7,8,9,10,11 constitute; When small gear and gearwheel joggleword, the flank profil line of small gear actual participation engagement is first to the 3rd section circular arc 1,2,3, and the flank profil line of gearwheel actual participation engagement is the 7th, eight a section circular arc 7,8.

In conjunction with Fig. 2, in the flank profil structure of the small gear of the driving gear of automobile instrument motor of the present invention, first, second section circular arc 1,2 links to each other and inscribe, second, third section circular arc 2,3 links to each other and inscribe, three, four arcs 3,4 links to each other and inscribe, the first, the 5th section circular arc 1,5 is continuous and circumscribed, and the 5th, the 6th section circular arc 5,6 is continuous and circumscribed; The 6th section circular arc 6 is tooth root circular arcs, the center of circle of the 6th section circular arc 6 is the small gear center, and four arcs 4 is tooth top circular arcs, and the center of circle of this four arcs 4 is on axis of symmetry OA, the standard pitch diameter of small gear is d1, the center of circle B of first section circular arc 1 is on the small gear standard pitch circle, and the starting point of first section circular arc 1 is the C point, and angle CBO equals 62.72 °, the terminal point of first section circular arc 1 is the D point, angle DBO equals 85 °, and angle DOA equals α, and the central angle of second section circular arc 2 equals 31.37 °.Wherein, small gear flank profil CALCULATION OF PARAMETERS formula is: d1=M * z1, R1=(0.5～0.7) M, R2=(1～1.2) M, R3=(1.2～1.5) M, R4=0.05～0.10, R6=(z1-2) M/2, α=0.93 * (90 °/z1), in the formula: R1, R2, R3, R4, R6 be respectively first, second, third and fourth, the radius of six sections circular arcs 1,2,3,4,6, unit is mm; M is a modulus, and z1 is the number of teeth of small gear.Modulus M=0.1,0.15,0.2,0.25,0.3; The number of teeth z1=6 of small gear～12.

In conjunction with Fig. 3 and Fig. 4, in the flank profil structure of the gearwheel of the driving gear of automobile instrument motor of the present invention, seven, the 8th section circular arc 7,8 is continuous and circumscribed, eight, the 9th section circular arc 8,9 links to each other and inscribe, seven, the 11 section circular arc 7,11 links to each other and inscribe, and the 11, the tenth section circular arc 11,10 links to each other and inscribe; The center of gearwheel is O, the standard pitch diameter of gearwheel is d2, and the center of circle F of the 7th section circular arc 7 is on the standard pitch circle of gearwheel, and the starting point of the 7th section circular arc 7 is G, angle GFO equals 75 °, the central angle of the 7th section circular arc 7 is 45 °, and the 7th section circular arc 7 is P with the intersection point of standard pitch circle, and angle POE equals β, the center of circle of the tenth section circular arc 10 is the center O of gearwheel, the center of circle of the 9th section circular arc 9 is H, and angle HOE equals θ, and the central angle of the 8th section circular arc 8 is 60 °.Wherein, the formula of gearwheel its parametric is: d2=M * z2, R7=(1～2) M, R8=1.333M, R9=0.8M, R10=d2/2+0.8M, β=(0.8～1) * (90 °/z2), θ=180 °/z2, R11=0.05～0.2, in the formula: R7, R8, R9, R10, R11 are respectively the radius of the 7th to 11 section circular arc [7,8,9,10,11], and unit is mm; M is a modulus, and z2 is the number of teeth of gearwheel.Modulus M=0.1,0.15,0.2,0.25,0.3; The number of teeth z2=30 of gearwheel～180.

In the flank profil structure of automobile instrument motor driving gear of the present invention, the flank profil structure principal part of small gear is the gear engagement profile of tooth that a kind of three sections circular arcs constitute, and the flank profil structure principal part of the gearwheel that is meshed is the gear engagement profile of tooth that is made of two sections circular arcs.This flank profil structure has the characteristics of the constant rotation ratio of involute gear when engagement, have the big retarding ratio of standard timepiece with the Machining Modified Cycloidal Gears profile of tooth again.

To be equipped with MCR1 type automobile instrument motor driving gear is embodiment, and structure of the present invention is described.The number of teeth of driving pinion and intermediate speed pinion all is 6 teeth, and the number of teeth of gear broad in the middle and output gearwheel all is 96 teeth, M=0.15mm, and small gear flank profil parameter is: d1=0.9, R1=0.12, R2=0.16, R3=0.20, R4=0.10, R5=0.10, R6=0.3, α=13.95 °.The gearwheel its parametric is: d2=14.4, R7=0.24, R8=0.2, R9=0.12, R10=7.32, β=0.89 °, θ=1.88 °, R11=0.05.The unit of R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 all is mm.

Although embodiments of the invention are only enumerated a kind of in the parameter protection scope; but it is fully open; those skilled in the art all can obtain not only initiatively input speed height according to other numerical value in said structure and the parameter area; output speed is low; transmission speed ratio is big; and overall structure is little, and transmission requires steadily, the driving gear of the automobile instrument motor that vibration and noise are little.

Claims

1, a kind of driving gear of automobile instrument motor, comprise motor driven small gear [12], gear broad in the middle [13], intermediate speed pinion [14] and output gearwheel [15], gear broad in the middle [13] and intermediate speed pinion [14] are in-line gears, driving pinion [12] and gear broad in the middle [13] are meshed, intermediate speed pinion [14] and output gearwheel [15] are meshed, driving pinion [12] is identical with the flank profil structure of intermediate speed pinion [14], be referred to as small gear, gear broad in the middle [13] is identical with the flank profil structure of output gearwheel [15], be referred to as gearwheel, the flank profil line that it is characterized in that small gear is the curve along axes O A symmetry, by first to the 6th section tangent circular arc [1,2,3,4,5,6] constitute, the flank profil line of the gearwheel of engagement is the curve along axes O E symmetry relatively, by the 7th to the 11 section tangent circular arc [7,8,9,10,11] constitute; When small gear and gearwheel joggleword, the flank profil line that small gear participates in engagement is first to the 3rd section circular arc [1,2,3], and the flank profil line that gearwheel participates in engagement is the 7th, eight section circular arc [7,8].

2, the driving gear of automobile instrument motor according to claim 1, it is characterized in that in the flank profil structure of small gear, first, second section circular arc [1,2] links to each other and inscribe, second, third section circular arc [2,3] links to each other and inscribe, three, four arcs [3,4] links to each other and inscribe, the first, the 5th section circular arc [1,5] links to each other and is circumscribed, and the 5th, the 6th section circular arc [5,6] links to each other and be circumscribed; The 6th section circular arc [6] is the tooth root circular arc, the center of circle of the 6th section circular arc [6] is the small gear center, four arcs [4] is the tooth top circular arc, the center of circle of this four arcs [4] is on axis of symmetry OA, the standard pitch diameter of small gear is d1, the center of circle B of first section circular arc [1] is on the small gear standard pitch circle, the starting point of first section circular arc [1] is the C point, angle CBO equals 62.72 °, the terminal point of first section circular arc [1] is the D point, angle DBO equals 85 °, and angle DOA equals α, and the central angle of second section circular arc [2] equals 31.37 °.

3, the driving gear of automobile instrument motor according to claim 2, it is characterized in that small gear flank profil CALCULATION OF PARAMETERS formula is: d1=M * z1, R1=(0.5～0.7) M, R2=(1～1.2) M, R3=(1.2～1.5) M, R4=0.05～0.10, R6=(z1-2) M/2, α=0.93 * (90 °/z1), in the formula: R1, R2, R3, R4, R6 be respectively first, second, third and fourth, the radius of six sections circular arcs [1,2,3,4,6], unit is mm; M is a modulus, and z1 is the number of teeth of small gear.

4, the driving gear of automobile instrument motor according to claim 3 is characterized in that: modulus M=0.1,0.15,0.2,0.25,0.3; The number of teeth z1=6 of small gear～12.

5, the driving gear of automobile instrument motor according to claim 1, it is characterized in that in the flank profil structure of gearwheel, seven, the 8th section circular arc [7,8] links to each other and is circumscribed, eight, the 9th section circular arc [8,9] links to each other and inscribe, seven, the 11 section circular arc [7,11] links to each other and inscribe, and the 11, the tenth section circular arc [11,10] links to each other and inscribe; The center of gearwheel is O, the standard pitch diameter of gearwheel is d2, and the center of circle F of the 7th section circular arc [7] is on the standard pitch circle of gearwheel, and the starting point of the 7th section circular arc [7] is G, angle GFO equals 75 °, the central angle of the 7th section circular arc [7] is 45 °, and the 7th section circular arc [7] is P with the intersection point of standard pitch circle, and angle POE equals β, the center of circle of the tenth section circular arc [10] is the center O of gearwheel, the center of circle of the 9th section circular arc [9] is H, and angle HOE equals θ, and the central angle of the 8th section circular arc [8] is 60 °.

6, the driving gear of automobile instrument motor according to claim 5, the formula that it is characterized in that the gearwheel its parametric is: d2=M * z2, R7=(1～2) M, R8=1.333M, R9=0.8M, R10=d2/2+0.8M, β=(0.8～1) * (90 °/z2), θ=180 °/z2, R11=0.05～0.2, in the formula: R7, R8, R9, R10, R11 are respectively the radius of the 7th to 11 section circular arc [7,8,9,10,11], and unit is mm; M is a modulus, and z2 is the number of teeth of gearwheel.

7, the driving gear of automobile instrument motor according to claim 6 is characterized in that modulus M=0.1,0.15,0.2,0.25,0.3; The number of teeth z2=30 of gearwheel～180.