CN103089953B - Line defect cycloidal gear transmission device - Google Patents

Abstract

The invention relates to a line defect cycloidal gear transmission device for changing transmission ratios. The device comprises a box body, an eccentric input shaft, a line defect cycloidal wheel, a line defect needle wheel, column pins, an output plate and an output shaft. One section formed by the fact that the eccentric input shaft stretches into the box body through a bearing is an input shaft eccentric section. The line defect cycloidal wheel is mounted on the input shaft eccentric section through the bearing and meshed with the line defect needle wheel. The line defect needle wheel is fixedly connected with the box body. The column pins are uniformly distributed on the output plate, one ends of the column pins stretch into pin holes of the line defect cycloidal wheel for sliding, and the column pins are matched with an eccentricity of the line defect cycloidal wheel in a rolling mode. The output plate is fixed on the output shaft. The output shaft is mounted on the other side wall, opposite to the eccentric input shaft, of the box body through the bearing. The line defect cycloidal gear transmission device has the advantages that meshing number of teeth is large, and the device is large in overload capacity and long in service life.

Description

Line defect cycloidal gear transmission device

Technical field

The present invention relates to a kind of mechanical transmission fields, be specifically related to a kind of line defect cycloidal gear transmission device of variable ratio.

Background technique

Mechanical transmission is the rotating speed rotating speed of input shaft being transformed into output shaft, realizes the moment of torsion transmission between input shaft and output shaft simultaneously.Mechanical transmission includes multiple gear assembly, and these gear assemblies are coupled to each other to realize predetermined velocity ratio by different structures.

At present, the application of more existing transmission device with varied transmission ratios, solves some technical problems.Chinese patent literature CN201420841Y discloses a name on March 10th, 2010 and is called " limited slip differential ", it comprises planet wheel, central gear and ring gear, three gears of this differential mechanism are non-circular planetary gear, when there is relative movement when between gear, the velocity ratio of former and later two rotating shafts does not keep fixed value, but periodically change, achieve the change of velocity ratio like this.The shortcoming of this structure is that the number of teeth engaged between planet wheel with central gear is few, and overload capacity is lower.

Summary of the invention

Technical problem to be solved by this invention is just to provide that a kind of number of teeth of engagement is many, overload capacity strong, and velocity ratio periodically continually varying nodel line cycloidal gear transmission device.

Technical problem to be solved by this invention is realized by such technological scheme, it includes casing, eccentric input shaft, traitorous line cycloid wheel, traitorous line pinwheel, pin, output disc and output shaft, eccentric input shaft one section of being stretched in casing by bearing is input shaft eccentric segment, line cycloid wheel of switching political loyalty is arranged on the eccentric shaft part of input shaft by bearing, line cycloid wheel of switching political loyalty engages with traitorous line pinwheel, line pinwheel of switching political loyalty is fixedly connected with casing, output disc is evenly laid with pin, pin one end is stretched in the pin-and-hole in traitorous line cycloid wheel and is slided, roll with the bias of traitorous line cycloid wheel and match, output disc is fixed on output shaft, axle shaft is arranged on another sidewall of the casing relative with eccentric input shaft by bearing, the tooth profile curve equation formula of described traitorous line cycloid wheel

$\left\{\begin{array}{c}{x}_M=[R\left(\mathrm{\ψ}\right)+r]\cos \mathrm{\θ}-E\cos {\mathrm{\θ}}_a\\ y_M=[R\left(\mathrm{\ψ}\right)+r]\sin \mathrm{\θ}-E\sin {\mathrm{\θ}}_a\end{array}\right.$

X in formula _m, Y _m---the coordinate of any point M in the flank profil of line cycloid wheel of switching political loyalty

R (ψ)---fixing not rounded polar equation

R---rolling circle radius

E---the throw of eccentric of round as a ball upper M point

θ---the round as a ball angle turned over around not rounded initial point

θ _a---round as a ball absolute corner.

Transmission principle of the present invention: eccentric input shaft rotates clockwise, drive line cycloid wheel planetary motion of switching political loyalty, line cycloid wheel of switching political loyalty engages with the round pin tooth on traitorous line pinwheel, line cycloid wheel of switching political loyalty is counterclockwise, and speed change is rotated, by pin, the counterclockwise speed change rotation of traitorous line cycloid wheel is passed to output disc, and then realize variable ratio transmission.

Technique effect of the present invention is:

1, eccentric input shaft is coaxial with output shaft;

2, rotate continuously towards a direction with uniform angular velocity when eccentric shaft enters axle, line defect cycloidal gear transmission device velocity ratio property performance period consecutive variations, achieves the transmission of variable ratio;

3, line cycloidal-pin wheel engagement of switching political loyalty is adopted to realize variable ratio transmission, therefore there is the feature of Cycloidal pin-wheel drive, pin tooth and cycloidal gear teeth are that a tooth is poor, the number of teeth simultaneously engaged is many, the cycloidal-pin wheel of 1/2nd is had to participate in engagement in theory, so there is larger overload capacity, long service life.

Compared with prior art, outstanding advantages of the present invention is: velocity ratio periodically consecutive variations, and the number of teeth of engagement is many, have larger overload capacity, long service life.

Accompanying drawing explanation

Accompanying drawing of the present invention is described as follows:

Fig. 1 is the structural representation of first embodiment of the invention;

Fig. 2 is A-A sectional view in Fig. 1;

Fig. 3 is the structural parameter schematic diagram of traitorous string pendulum line profile line;

Fig. 4 is line Cycloid tooth profile plotted curve of switching political loyalty;

Fig. 5 is the traitorous line cycloid wheel nodel line figure of one embodiment of the invention and traitorous line pinwheel nodel line figure;

Fig. 6 is the velocity ratio change curve of one embodiment of the invention;

Fig. 7 is that the outer pinwheel of traitorous line and traitorous line hypocycloid take turns mesh schematic representation;

Fig. 8 is that traitorous line epicyclodial wheel and traitorous line hypocycloid take turns mesh schematic representation.

In figure: 1. casing; 2. eccentric input shaft; 3. traitorous line cycloid wheel; 4. traitorous line pinwheel; 5. pin; 6. output disc; 7. output shaft.

Embodiment

Below in conjunction with drawings and Examples, the invention will be further described:

As depicted in figs. 1 and 2, the present invention includes casing 1, eccentric input shaft 2, traitorous line cycloid wheel 3, traitorous line pinwheel 4, pin 5, output disc 6 and output shaft 7, eccentric input shaft 2 one section of stretching in casing 1 through bearing is input shaft eccentric segment, line cycloid wheel 3 of switching political loyalty is arranged on the eccentric shaft part of input shaft by bearing, line cycloid wheel 3 of switching political loyalty engages with traitorous line pinwheel 4, line pinwheel 4 of switching political loyalty is fixedly connected with casing 1, output disc 6 is evenly laid with pin 5, pin 5 one end is stretched in the pin-and-hole in traitorous line cycloid wheel 3 and is slided, roll with the bias of traitorous line cycloid wheel 3 and match, output disc 6 is fixed on output shaft 7, axle shaft 7 is arranged on another sidewall of casing 1 relative with eccentric input shaft 2 by bearing.

As shown in Figure 2, above-mentioned eccentric input shaft 2 be one around departing from outside center the solid of rotation a bit rotated, also can be the bending axle in casing.

The present invention realizes the theory analysis of variable ratio:

The nodel line of general cycloid wheel is circular, and the nodel line of line cycloid wheel of switching political loyalty is non-circular.

The tooth profile curve equation formula of line cycloid wheel of 1, switching political loyalty

As shown in Figure 3, suppose that not rounded R (ψ) maintains static, and get fixing not rounded o _afor the initial point of x-y right angled coordinates.When in not rounded, R (ψ) is rolled into B point from C point to round as a ball r, its center o is around not rounded o _athe angle turned over is θ.The absolute corner of round as a ball r is θ _a, the relative rotation of round as a ball r is θ _b, upper 1 M of round as a ball r, if throw of eccentric then the track of M point is line cycloidal gear teeth of switching political loyalty, and the curvilinear equation of M locus of point is:

$\left\{\begin{array}{c}{x}_M=[R\left(\mathrm{\ψ}\right)+r]\cos \mathrm{\θ}-E\cos {\mathrm{\θ}}_a\\ y_M=[R\left(\mathrm{\ψ}\right)+r]\sin \mathrm{\θ}-E\sin {\mathrm{\θ}}_a\end{array}\right.---\left(1\right)$

In formula

R (ψ)---fixing not rounded polar equation

R---rolling circle radius

E---the throw of eccentric of round as a ball upper M point

θ---the round as a ball angle turned over around not rounded initial point

θ _a---round as a ball absolute corner

Line Cycloid tooth profile curve must be switched political loyalty thus as shown in Figure 4.

When round as a ball roll across a tooth around fixing not rounded R (ψ) time and round as a ball r turns over a full circle relatively, θ _b=2 π, so θ _b=z _aθ.And round as a ball absolute rotational angle theta _a=θ _b+ θ=z _aθ+θ=(z _a+ 1) θ=z _bθ;

θ _b---the round as a ball corner relatively fixing not rounded

Z _a---the number of teeth of line cycloid wheel of switching political loyalty

Z _b---the number of teeth (z of line pinwheel of switching political loyalty _b=z _a+ 1)

In line cycloid wheel of switching political loyalty, any point M curvilinear equation is:

$\left\{\begin{array}{c}{x}_M=[R\left(\mathrm{\ψ}\right)+r]\cos \mathrm{\θ}-E\cos z_b\mathrm{\θ}\\ y_M=[R\left(\mathrm{\ψ}\right)+r]\sin \mathrm{\θ}-E\sin z_b\mathrm{\θ}\end{array}\right.---\left(2\right)$

2, velocity ratio

According to books " cycloid pinwheel planetary gear transmission system ", Zhengzhou Polytechnical College's Der Grundsatz der Maschinen and mechanical parts teaching and research room compile, 15th ~ 17 pages, Science Press, describe the relation between cycloidal profile two kinds of forming methods in March, 1979, propose known round as a ball r roll on fixing round R formed cycloidal profile, the nodel line can obtaining cycloid wheel and pinwheel is respectively r _awith r _b.

The content of carrying according to this secretary is derived and is obtained following equation:

Known fixed not rounded polar equation R (ψ), rolling circle radius r, then line cycloid wheel nodel line polar equation of switching political loyalty

$\left\{\begin{array}{c}{r}_a=\frac{\mathrm{ER}\left(\mathrm{\ψ}\right)}{r}\\ \mathrm{\ψ}=0~2\mathrm{\π}\end{array}\right.---\left(3\right)$

R in formula _a---the footpath, pole of the nodel line polar equation of line cycloid wheel of switching political loyalty

R-rolling circle radius

Traitorous line pinwheel nodel line polar equation

$\left\{\begin{array}{c}{r}_b=\frac{\mathrm{ER}\left(\mathrm{\ψ}\right)}{r}+E\\ {\mathrm{\φ}}_b={\∫}_0^{\mathrm{\ψ}}\frac{\mathrm{ER}\left({\mathrm{\φ}}_b\right)+\mathrm{Er}}{\mathrm{ER}\left({\mathrm{\φ}}_a\right)}\mathrm{d\ψ}\end{array}\right.---\left(4\right)$

Because traitorous line cycloid wheel does planetary motion under eccentric input shaft drives, so its velocity ratio can not represent with simple radius inverse ratio, the angular velocity of eccentric input shaft, line cycloid wheel of switching political loyalty and traitorous line pinwheel is respectively: d φ _h, d φ _awith d φ _b.Because traitorous line cycloid wheel engages with fixing pin tooth of switching political loyalty on line pinwheel, line cycloid wheel of switching political loyalty produces rotation, pin on output disc coordinates with the pin-and-hole eccentric rotary in traitorous line cycloid wheel, so only the spinning motion of traitorous line cycloid wheel can be passed to output disc, in fact output disc rotates is exactly the spinning motion of line cycloid wheel of switching political loyalty, so the angular velocity ratio of input shaft and output shaft, be exactly the switch political loyalty revolution of line cycloid wheel and the ratio of rotation.

According to relative motion principle, if give whole transmission device add one with eccentric input shaft angular velocity equal and opposite in direction and the contrary angular velocity-d φ in direction _h, then the relative motion relation between each component remains unchanged.But because whole transmission device adds-d φ _hrear input shaft can be considered transfixion, so planetary motion is converted into ordinary transmission.

$i_{\mathrm{ab}}^{d{\mathrm{\φ}}_H}=\frac{d{\mathrm{\φ}}_a-d{\mathrm{\φ}}_H}{d{\mathrm{\φ}}_b-d{\mathrm{\φ}}_H}=\frac{r_b}{r_a}---\left(5\right)$

In formula

---the velocity ratio of switch political loyalty after being converted into fixed-axis rotation line cycloid wheel and traitorous pinwheel

D φ _a---line cycloid wheel angular velocity of switching political loyalty

D φ _b---line pinwheel angular velocity of switching political loyalty

D φ _h---input shaft angular velocity

Because traitorous line pinwheel is fixedly connected with casing, so d φ _b=0, substitution formula (5) obtains variable ratio and is:

$i_{H2}=\frac{r_a}{r_a-r_b}=-\frac{r_a}{E}---\left(6\right)$

Obtained, due to not rounded cycloid wheel polar coordinates r by formula (6) _awith corner change, so when eccentric input shaft rotates towards a direction continuously with uniform angular velocity, the transmission of string pendulum line tooth driving device of switching political loyalty is compared to cyclically-varying.

Embodiment

Get fixing not rounded for time oval, polar equation:

$\left\{\begin{array}{c}{R}_{\mathrm{\ψ}}=\frac{A(1-k_1^2)}{1-k_1\cos \mathrm{\ψ}}\\ \mathrm{\ψ}=0~2\mathrm{\π}\end{array}\right.---\left(7\right)$

In formula

K ₁---oval eccentric rate

ψ---oval polar angle

A---transverse radius

Known fixed not rounded polar equation R (ψ), must to be switched political loyalty line cycloid wheel nodel line polar equation by (3) formula

$\left\{\begin{array}{c}{r}_a=\frac{\mathrm{EA}(1-k_1^2)}{r\left(1-k_1\cos \mathrm{\ψ}\right)}\\ \mathrm{\ψ}=0~2\mathrm{\π}\end{array}\right.---\left(8\right)$

Must to be switched political loyalty line pinwheel nodel line polar equation by (4) formula

$\left\{\begin{array}{c}{r}_b=\frac{\mathrm{EA}(1-k_1^2)}{r(1-k_1\cos \mathrm{\ψ})}+E\\ {\mathrm{\φ}}_b={\∫}_0^{\mathrm{\ψ}}\frac{\mathrm{ER}\left({\mathrm{\φ}}_b\right)+\mathrm{Er}}{\mathrm{ER}\left({\mathrm{\φ}}_a\right)}\mathrm{d\ψ}\end{array}\right.---\left(9\right)$

Figure 5 shows that traitorous line cycloid wheel nodel line and traitorous line pinwheel nodel line; R in Fig. 5 _afor the footpath, pole of the nodel line polar equation of traitorous line cycloid wheel, r _bfor the footpath, pole of the nodel line polar equation of traitorous line pinwheel.

Variable ratio i is the ratio of traitorous line cycloid wheel revolution angular velocity and spin velocity, i.e. the ratio of input shaft and output shaft angular velocity

$i=-\frac{r_a}{E}=-\frac{A(1-k_1^2)}{r(1-k_1\cos \mathrm{\ψ})}---\left(10\right)$

As shown in Figure 6, when eccentric input shaft rotates towards a direction continuously with uniform angular velocity, the transmission of string pendulum line tooth driving device of switching political loyalty is compared to cyclically-varying.

In structure shown in Fig. 1 and Fig. 2, line cycloid wheel of switching political loyalty 3 is line epicyclodial wheel of switching political loyalty, and line pinwheel 4 of switching political loyalty is for pinwheel in line of switching political loyalty.Certainly, what structure of the present invention also can adopt the outer pinwheel of traitorous line as shown in Figure 7 to take turns with traitorous line hypocycloid engages, and line cycloid wheel 3 of namely switching political loyalty is line hypocycloid wheel of switching political loyalty, and line pinwheel 4 of switching political loyalty is for the outer pinwheel of line of switching political loyalty; What traitorous line epicyclodial wheel as shown in Figure 8 can also be adopted to take turns with traitorous line hypocycloid engages, and line cycloid wheel 3 of namely switching political loyalty is line epicyclodial wheel of switching political loyalty, and line pinwheel 4 of switching political loyalty is for line hypocycloid wheel of switching political loyalty.

Claims (5)

1. line defect cycloidal gear transmission device, include casing (1), eccentric input shaft (2), traitorous line cycloid wheel (3), traitorous line pinwheel (4), pin (5), output disc (6) and output shaft (7), eccentric input shaft (2) a section of being stretched in casing (1) by bearing is input shaft eccentric segment, line cycloid wheel (3) of switching political loyalty is arranged on the eccentric shaft part of input shaft by bearing, line cycloid wheel (3) of switching political loyalty engages with traitorous line pinwheel (4), line pinwheel (4) of switching political loyalty is fixedly connected with casing (1), output disc (6) is evenly laid with pin (5), pin (5) one end is stretched in the pin-and-hole on traitorous line cycloid wheel (3) and is slided, roll with the bias of traitorous line cycloid wheel (3) and match, on the fixing output shaft (7) of output disc (6), axle shaft (7) is arranged on casing (1) another sidewall relative with eccentric input shaft (2) by bearing, it is characterized in that, the tooth profile curve equation formula of described traitorous line cycloid wheel:

$\left\{\begin{array}{c}{x}_M=[R\left(\mathrm{\ψ}\right)+r]\cos \mathrm{\θ}-E\cos {\mathrm{\θ}}_a\\ y_M=[R\left(\mathrm{\ψ}\right)+r]\sin \mathrm{\θ}-E\sin {\mathrm{\θ}}_a\end{array}\right.$

X in formula _m, Y _m---the coordinate of any point M in the flank profil of line cycloid wheel of switching political loyalty

R (ψ)---fixing not rounded polar equation

R---rolling circle radius

E---the throw of eccentric of round as a ball upper M point

θ---the round as a ball angle turned over around not rounded initial point

θ _a---round as a ball absolute corner.

2. line defect cycloidal gear transmission device according to claim 1, is characterized in that: described eccentric input shaft (2) be one around the bending axle in the solid of rotation or casing that to depart from outside center a bit to rotate.

3. line defect cycloidal gear transmission device according to claim 1 and 2, is characterized in that: line cycloid wheel (3) of switching political loyalty is line epicyclodial wheel of switching political loyalty, and line pinwheel (4) of switching political loyalty is for pinwheel in line of switching political loyalty.

4. line defect cycloidal gear transmission device according to claim 1 and 2, is characterized in that: line cycloid wheel (3) of switching political loyalty is line hypocycloid wheel of switching political loyalty, and line pinwheel (4) of switching political loyalty is for the outer pinwheel of line of switching political loyalty.

5. line defect cycloidal gear transmission device according to claim 1 and 2, is characterized in that: line cycloid wheel (3) of switching political loyalty is line epicyclodial wheel of switching political loyalty, and line pinwheel (4) of switching political loyalty is for line hypocycloid wheel of switching political loyalty.