CN111795129A

CN111795129A - Parallel shaft speed reducer

Info

Publication number: CN111795129A
Application number: CN201910274741.1A
Authority: CN
Inventors: 郭远军; 郭幸铜; 郭幸钢
Original assignee: Hunan Lingling Hengyuan Power Generation Equipment Co ltd
Current assignee: Hunan Lingling Hengyuan Power Generation Equipment Co ltd
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2020-10-20

Abstract

The invention discloses a parallel shaft speed reducer which comprises a shell, a transmission mechanism and a speed limiting mechanism. The transmission mechanism comprises an input shaft and an output shaft meshed with the input shaft, and the output shaft is provided with an accommodating space; the speed limiting mechanism is arranged in the accommodating space of the output shaft and used for reducing the rotating speed of the output shaft when the output shaft is larger than a preset value. This parallel shaft speed reducer can guarantee the rotation at the uniform velocity, can not cause the unnecessary loss because of speeding to, structure and the fluidic material of non-Newton through rabbling mechanism can set up different rotational speeds, can adapt to the rotating equipment of different demands, even also can be safe, the operation of stability under high temperature, highly compressed adverse circumstances.

Description

Parallel shaft speed reducer

Technical Field

The invention relates to a speed reducing device, in particular to a parallel shaft speed reducer.

Background

The parallel shaft speed reducer is a speed reducer in which gear shafts are parallel to each other, and is a power transmission mechanism that obtains a large torque by reducing the number of revolutions of a motor (motor) to a desired number of revolutions using a speed converter of a gear. In a mechanism for transmitting power and motion, a parallel shaft speed reducer has a quite wide application range, but the devices connected with the speed reducer are generally driven by a motor and often have rated rotating speeds, the rotating speed of the motor can be changed by factors such as frequency, voltage and the like, and when a frequency converter is in failure or damaged, the rotating speed can be out of control and a runaway accident can be caused. For example, the excessive speed of the conveyer results in the excessive conveying amount and causes blockage, and for example, the excessive speed of the elevator causes safety accidents.

In the prior art, a sensor is adopted to detect the rotating speed, and when the rotating speed is too high, a controller controls the motor to run at a reduced speed, so that the stability of the technology is not high enough, and in a severe environment with high temperature and high pressure, elements such as the sensor, a circuit and the controller are easy to damage and break down.

Therefore, it is important to provide a parallel-axis speed reducer that can efficiently and stably prevent overspeed operation.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a parallel shaft speed reducer capable of stably running and preventing equipment from running in an overspeed manner.

The embodiment of the invention provides a parallel shaft speed reducer, which comprises:

a housing having an accommodating space;

the transmission mechanism is arranged in the accommodating space of the shell and comprises an input shaft and an output shaft meshed with the input shaft, and the output shaft is provided with an accommodating space;

and the speed limiting mechanism is arranged in the accommodating space of the output shaft and used for reducing the rotating speed of the output shaft when the output shaft is larger than a preset value.

Optionally, the speed limiting mechanism includes:

one end of the rotating shaft is connected into the output shaft, and the other end of the rotating shaft is connected with the shell and is relatively fixed with the shell;

the stirring mechanism is arranged on the rotating shaft and is provided with a first stirring blade;

and the non-Newtonian fluid is hermetically arranged in the accommodating space of the output shaft.

Optionally, the speed limiting mechanism further includes:

and the adjusting mechanism is arranged on the rotating shaft and used for adjusting the fluid resistance of the first stirring blade when the output shaft rotates.

Optionally, the speed limiting mechanism further includes:

and the friction mechanism is arranged between the inner wall of the output shaft and the stirring mechanism and used for reducing the rotating speed by enabling the friction mechanism to generate friction when the rotating speed of the output shaft is greater than a preset value.

Optionally, the adjusting mechanism penetrates through one end of the output shaft, and the adjusting mechanism is provided with a second stirring blade which is overlapped with the first stirring blade and can move relatively.

Optionally, the adjusting mechanism further includes:

the adjusting plate is provided with a circular ring part and the second stirring blade, the circular ring part is sleeved on the rotating shaft, and one end of the circular ring part is connected with the second stirring blade;

and the adjusting operation part is connected with the other end of the circular ring part, is positioned on the outer side of the shell and is used for driving the second stirring blade to axially move relative to the first stirring blade so as to adjust the relative position of the second stirring blade and the first stirring blade.

Optionally, the stirring mechanism further includes:

the sliding sleeve is sleeved on the rotating shaft and is provided with a sliding chute;

the sliding block is embedded in the sliding groove and can axially move relative to the sliding groove, and the first stirring blade is connected with the sliding block;

one end of the connecting rod is hinged with the sliding block, the other end of the connecting rod is hinged with the rotating shaft, and the connecting rod drives the sliding block to move axially when swinging;

and one end of the elastic piece is connected with the rotating shaft, and the other end of the elastic piece is connected with the sliding block and used for providing axial pulling force between the rotating shaft and the sliding block.

Optionally, the friction mechanism is a friction disc, and is disposed between the inner wall of the output shaft and the stirring mechanism.

Optionally, a second adjusting hole is formed in the second stirring blade, and a first adjusting hole is formed in the first stirring blade.

Optionally, the stirring mechanism further includes:

the sliding block is embedded in the sliding groove and can move radially relative to the sliding groove, and the first stirring blade is connected with the sliding block;

the cam part is arranged on the rotating shaft and used for driving the sliding block to move in the radial direction when the sliding sleeve rotates relative to the rotating shaft;

and one end of the elastic piece is connected with the rotating shaft, and the other end of the elastic piece is connected with the sliding block and used for providing pulling force between the rotating shaft and the sliding block.

Optionally, the adjusting mechanism includes:

the adjusting shaft is arranged in the rotating shaft, and an adjusting groove is formed in the adjusting shaft;

the swing rod is clamped in the adjusting groove, the first stirring blade is provided with a circular blade handle, and the blade handle penetrates through the sliding block and is connected with the swing rod for adjusting the angle of the first stirring blade when the swing rod swings;

and the adjusting operation part is connected with the adjusting shaft and the shell and used for driving the adjusting shaft to axially move relative to the shell so as to drive the swing rod to swing.

The input end of the parallel shaft speed reducer is connected with the motor, the output end of the parallel shaft speed reducer is connected with the rotating part of the rotating equipment, the rotating equipment synchronously rotates or proportionally rotates, the required speed and the working speed of the stirring mechanism can be selected according to the requirement of the equipment by changing the rotating sectional area of the first stirring blade, when the section of the first stirring blade is larger, the resistance for stirring the non-Newtonian fluid is larger, otherwise, the resistance is smaller, the resistance can also be changed by the material of the non-Newtonian fluid, when the non-Newtonian fluid is thinner, the resistance is smaller, and otherwise, when the non-Newtonian fluid is thicker, the resistance is larger. For example, when the rated rotation speed is set to be 100rpm, the output shaft drives the rotating device to rotate to drive the non-newtonian fluid to rotate, the first stirring blade keeps still, so that the non-newtonian fluid is stirred to generate resistance, and when the rotation speed is within 100rpm, the non-newtonian fluid is in a liquid state, so that the non-newtonian fluid is very good in fluidity and cannot generate great resistance. When the rotating speed is higher than 100rpm, the stirring speed of the non-Newtonian fluid is increased, resistance is generated, the non-Newtonian fluid becomes thick under the condition of large resistance and even becomes a solid state, so that the first stirring blade is subjected to large resistance, the rotating speed is limited, and the rotating speed is stable at 100 rpm.

The viscosity of the shear thickening fluid can be well adjusted, so that the shear thickening fluid is suitable for rotating speeds in different ranges, such as: the critical shear rate at which shear thickening of a suspension of SiO2 particles in a shear thickening fluid occurs decreases with increasing particle size and increases with increasing particle size distribution. The shear thickening strength of the SiO2 suspension decreases with increasing particle size and decreases with increasing particle size distribution. The particle size and distribution changes the shear thickening effect of the particle suspension primarily by changing the interparticle distance and the effective concentration of the particles.

Therefore, the non-Newtonian fluid is hermetically arranged in the stirring mechanism and the output shaft, so that the parallel shaft speed reducer can be ensured to rotate at a limited rotating speed, and unnecessary loss caused by exceeding the speed is avoided. The axial relative position of the rotating shaft in the output shaft is limited through the limiting mechanism, and the stability and the continuity of uniform-speed rotation can be guaranteed. And different rotating speeds can be set through the structure of the stirring mechanism and the material of the non-Newtonian fluid, so that the stirring mechanism can adapt to rotating equipment with different requirements, and can safely and stably operate even in a high-temperature and high-pressure severe environment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 to 3 are perspective views showing respective orientations of a first embodiment of the present invention, in which fig. 1 is an overall external view, fig. 2 is a view with a part of a housing cut away to show the structure of an internal transmission mechanism, and fig. 3 is a view taken along an output shaft to show the internal structure;

FIG. 4 illustrates a cross-sectional view of the speed limiting mechanism in isolation to more clearly show the internal mechanisms of the speed limiting mechanism;

FIG. 5 is an enlarged view of part B of FIG. 4;

FIG. 6 independently illustrates an internal perspective view of the speed limiting mechanism with a portion of the output shaft removed, highlighting the internal stirring mechanism and adjustment mechanism portions;

FIG. 7 is an exploded view of the speed limiting mechanism with parts removed;

FIGS. 8 and 9 show the speed limiting mechanism with a portion of the output shaft removed, with the internal stirring mechanism and adjustment mechanism portions highlighted;

FIG. 10 is a schematic cross-sectional view of another speed limiting mechanism of the present invention;

FIG. 11 is the perspective view of FIG. 10 with the output shaft removed, highlighting the internal stirring mechanism portion;

FIG. 12 is an exploded view of FIG. 11;

FIG. 13 is the perspective view of FIG. 10 with the output shaft and friction disk removed, with portions of the adjustment mechanism inside highlighted;

fig. 14 is a right side view of fig. 10 with the output shaft removed, highlighting the agitation mechanism portion.

Detailed Description

The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

It is to be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the generic and descriptive sense only and not for purposes of limitation, as the term is used in the generic and descriptive sense, and not for purposes of limitation, unless otherwise specified or implied, and the specific reference to a device or element is intended to be a reference to a particular element, structure, or component. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Implementation mode one

As shown in fig. 1 to 9, the present embodiment provides a parallel-axis reduction gear including:

a housing 200 having an accommodation space;

a transmission mechanism 300 disposed in the accommodating space of the housing 200, wherein the transmission mechanism 300 includes an input shaft 310 and an output shaft 320 engaged with the input shaft 310, and the output shaft 320 has an accommodating space;

the speed limiting mechanism 100 is arranged in the accommodating space of the output shaft 320 and used for reducing the rotating speed of the output shaft 320 when the output shaft 320 is larger than a preset value.

Generally, the housing 200 of the parallel shaft reducer is detachable, and is divided into a detachable first housing 210 and a detachable base 220, and a first end cover 230, a second end cover 240, and a bottom cover 250. The input shaft 310 is generally a driving shaft and is connected to the motor 400, the motor 400 may be used with the present invention, or may be selected by a user, and both ends of the output shaft 320 are connected to the first end cap 230 and the base 220 through bearings. Generally, the transmission mechanism 300 can adopt one-stage speed reduction or multi-stage speed reduction, and a user can select the speed reduction by himself or herself, as shown in fig. 2, three-stage speed reduction is adopted, the input shaft 310 is meshed with the second gear 331, the second gear 331 is provided with the third gear 332, the third gear 332 is meshed with the fourth gear 333, the fourth gear 333 is provided with the fifth gear 334, and the fifth gear 334 is meshed with the output shaft 320.

The speed limiting mechanism 100 is arranged in the accommodating space of the output shaft 320, and when the output shaft 320 is larger than a preset value, the rotating speed of the output shaft 320 is reduced, so that the equipment is prevented from running in an overspeed manner, and safety accidents are avoided. The preset value is a rotating speed value which is selected and set by a user in advance according to the requirement of equipment, and the parallel shaft speed reducer is limited to operate within the preset value. Benefits of the speed limiting mechanism 100 being disposed within the output shaft 320: on one hand, the output shaft 320 has a larger size which is far larger than the size of the input shaft 310, so that the output shaft is convenient to accommodate, and on the other hand, the output shaft 320 is used as an output end, so that the speed is reduced, the control is convenient, and generally the actual rotating speed of the equipment is realized, so that the rotating speed is controlled more conveniently and directly.

The speed limiting mechanism 100 may have a structure as described below, and includes:

a rotating shaft 120, one end of which is connected to the output shaft 320, and the other end of which is connected to the housing 200 and is fixed relative to the housing 200;

the stirring mechanism 130 is arranged on the rotating shaft 120, and the stirring mechanism 130 is provided with a first stirring blade 135;

and the non-Newtonian fluid is hermetically arranged in the accommodating space of the output shaft 320.

For ease of manufacture and assembly, the output shaft 320 may be formed of separable parts including a ring gear 321, a hub 322, an output shaft 323, and a hub cap 324, the ring gear 321 being coupled to the hub 322 and being engaged with the input shaft 310 to be driven in rotation by the input shaft 310. The hub 322 is sealed with a non-newtonian fluid, which is a fluid that does not satisfy the experimental law of newtonian viscosity, i.e., a fluid whose shear stress and shear strain rate are not linear. In the present embodiment, it is preferable to use a shear thickening fluid, in which colloidal particles are generally in a densely packed state and are a pasty liquid, and water as a dispersion medium fills gaps between the densely arranged particles. When the applied stress is small and the flow is slow, the viscous resistance exhibited by the colloidal paste is small due to the sliding and flowing action of water. If the ion is stirred with force, the ions in the dense arrangement are disturbed at a stroke to form a porous loose arrangement structure. At this time, since the original water content can no longer fill the gaps between the particles, there is no sliding action of the water layer between the particles, and the viscous resistance increases abruptly, and even the flow property is lost. Because the particles become loosely aligned under strong shear, the apparent volume increases.

The number of the first stirring vanes 135 may be one or more, and specifically, may be set according to the requirement, and is preferably two or more, and the first stirring vanes are symmetrically arranged, and this embodiment employs two radial equispaced blades. The rotating shaft 120 penetrates through the output shaft 320, one end of the rotating shaft is connected in the output shaft 320, the other end of the rotating shaft is connected with the shell 200, and the rotating shaft and the shell 200 are kept relatively fixed. When the parallel shaft reducer operates, the output shaft 320 rotates to drive the non-newtonian fluid to rotate, while the first stirring vane 135 remains stationary, so that the non-newtonian fluid is stirred, and resistance is generated.

The axial rotation limiting mechanism 160 can be further included, and the limiting mechanism 160 is used for preventing the output shaft 320 and the rotating shaft 120 from moving axially during relative rotation, so that the axial relative position of the rotating shaft 120 in the output shaft 320 is limited to be kept unchanged.

The use method and the working principle of the embodiment are as follows: one end of the parallel shaft reducer is connected with the rotating part of the rotating device to synchronously rotate or proportionally rotate, the required speed is selected according to the requirement of the device, the working speed of the stirring mechanism 130 can be realized by changing the size of the rotating sectional area of the first stirring blade 135, when the section of the first stirring blade 135 is larger, the resistance for stirring the non-Newtonian fluid is larger, and vice versa, the resistance can also be changed by the material of the non-Newtonian fluid, when the non-Newtonian fluid is thinner, the resistance is smaller, and vice versa, the resistance is larger when the non-Newtonian fluid is thicker. For example, when the rated rotation speed is set to be 100rpm, the output shaft 320 drives the rotating device to rotate, and drives the non-newtonian fluid to rotate, and the first stirring vane 135 keeps stationary, so that the non-newtonian fluid is stirred, and resistance is generated, and when the rotation speed is within 100rpm, the non-newtonian fluid is in a liquid state, and has very good fluidity, and no great resistance is generated. When the rotating speed is greater than 100rpm, the stirring speed of the non-newtonian fluid is increased, resistance is generated, the non-newtonian fluid becomes thick under the condition of large resistance and even becomes solid, and then the first stirring blade 135 is subjected to large resistance, so that the rotating speed is limited, and the rotating speed is stable at 100 rpm.

In this embodiment, the non-newtonian fluid sealed in the stirring mechanism 130 and the output shaft 320 can ensure that the parallel shaft reducer rotates at a limited rotation speed, and unnecessary loss caused by exceeding the rotation speed can be avoided. The axial relative position of the rotating shaft 120 in the output shaft 320 is limited by the limiting mechanism 160, so that the stability and the continuity of uniform-speed rotation can be ensured. In addition, different rotating speeds can be set through the structure of the stirring mechanism 130 and the material of the non-Newtonian fluid, so that the stirring mechanism can adapt to rotating equipment with different requirements, and can safely and stably operate even in a high-temperature and high-pressure severe environment.

As a further preferable aspect of the present embodiment, the governor mechanism 100 may further include:

the adjusting mechanism 140 is disposed on the rotating shaft 120 and is used for adjusting the fluid resistance received by the first stirring blade 135 when the output shaft 320 rotates.

Specifically, the adjusting mechanism 140 may have a second stirring blade that overlaps the first stirring blade 135 and is relatively movable, through one end of the output shaft 320.

As shown in fig. 4, the adjusting mechanism 140 partially penetrates through the output shaft 320, and a portion inside the output shaft 320 has a second stirring blade, the adjusting mechanism 140 can move axially relative to the rotating shaft 120, and the second stirring blade can overlap with or move relative to the first stirring blade 135 through the axial movement, so as to widen or reduce a cross-sectional area formed by the second stirring blade and the first stirring blade 135, and further adjust the resistance, thereby achieving the purpose of adjusting the speed.

Therefore, when the speed needs to be adjusted, the material of the non-newtonian fluid does not need to be changed, and the adjusting mechanism is only needed to adjust the cross-sectional area formed by the second stirring blade and the first stirring blade 135, so that the speed can be quickly adjusted, and the material of the non-newtonian fluid does not need to be replaced again, so that the resources are saved.

Further, referring to fig. 4 and 7, the adjustment mechanism 140 may adopt a structure including:

the adjusting plate 141 is provided with a circular ring part and a second stirring blade, the circular ring part is sleeved on the rotating shaft 120, and one end of the circular ring part is connected with the second stirring blade;

and an adjusting operation member 142 connected to the other end of the circular ring portion and located outside the housing 200, for driving the second stirring blade to move axially relative to the first stirring blade 135, so as to adjust the relative position of the second stirring blade and the first stirring blade 135.

The number of the second stirring vanes is the same as that of the first stirring vanes, the shape and size of the second stirring vanes can be the same as that of the first stirring vanes 135 as much as possible, the sectional area is the smallest when the second stirring vanes are completely overlapped, the resistance to the non-Newtonian fluid is the smallest when the second stirring vanes are completely overlapped, and the sectional area is the largest when the second stirring vanes are completely staggered, and the resistance to the non-Newtonian fluid is the largest when the second stirring vanes are completely staggered.

Wherein, adjust operating parts 142 and can adopt adjusting nut, adjusting nut's inner circle cover is established on the ring portion, adjusting nut's outer lane block is on casing 200 for adjusting nut can only rotate for casing 200, and can not axial displacement, and adjusting nut sets up in the outside of casing 200, the convenient regulation. The ring part is provided with a thread matched with the adjusting nut, and when the adjusting nut is rotated, the axial position of the adjusting plate 141 is moved, so that the cross-sectional area formed by the second stirring blade and the first stirring blade 135 is widened or reduced, and the purpose of adjusting the speed is achieved.

Of course, an electric adjustment mode may be adopted, specifically, an electric push rod, or an oil cylinder or an air cylinder is used, the piston is connected with the circular ring portion, and the cylinder body is connected with the housing 200, so that when the piston acts, the adjusting plate 141 is driven to move relative to the rotating shaft 120.

As shown in fig. 4, 7 and 9, the operating principle of the adjustment mechanism 140 is as follows:

assuming that the currently required rotation speed is 50rpm, the output rated speed of the rotating device is also 50rpm, and the rotation speed of the speed limiting mechanism 100 cannot limit the rotating device within 50rpm, for example, the speed limiting mechanism 100 needs to reach 80rpm to generate the speed limiting effect, it means that the speed limiting value of the speed limiting mechanism 100 is adjusted to 50rpm, at this time, a user can rotate the adjusting nut, so that the second stirring blade overlapped with the first stirring blade 135 moves in a staggered manner, and the cross-sectional area formed by the second stirring blade and the first stirring blade 135 is continuously widened, the resistance is continuously increased, the speed is continuously decreased, and when the cross-sectional area is widened to 50rpm, the adjusting nut can be stopped rotating.

Conversely, when the speed limit value is desired to be adjusted to be larger, the operation is reversed.

Wherein, in order to prevent that output shaft 320 when rotatory, the second stirring leaf warp because intensity is not enough or resistance is too big, can insert the second stirring leaf in the centre of first stirring leaf 135, set up first stirring leaf 135 into two and overlap promptly, a seam is left in the centre, lets the second stirring leaf insert in this seam, forms the structure that two first stirring leaves 135 press from both sides the second stirring leaf, has prevented like this that the second stirring leaf from bending deformation.

In order to further enhance the adjusting effect, a second adjusting hole 143 may be provided on the second stirring blade, a first adjusting hole 137 may be provided on the first stirring blade 135, and the shapes of the first adjusting hole 137 and the second adjusting hole 143 are preferably rectangular. When the first stirring vane 135 and the second stirring vane are completely overlapped, the first adjusting hole 137 and the second adjusting hole 143 are also completely overlapped, and the resistance is the smallest at this time, which is equivalent to reducing the area of the first stirring vane 135 and having a larger adjusting effect. When the adjustment is needed, the second stirring blades are staggered, so that the first adjusting holes 137 and the second adjusting holes 143 are also staggered, the area is gradually increased, and the resistance is increased. Therefore, when the first and second regulation holes 137 and 143 are provided, a wider range of regulation effect can be achieved. Therefore, by adopting the adjusting mechanism 140, the resistance of the first stirring blade 135 can be adjusted at any time in the operation process of the equipment, that is, the speed-limiting value of the speed-limiting mechanism 100 is adjusted, so that the speed-limiting mechanism 100 has a larger adjusting range, and the application range is wider and more flexible. And the speed limiting mechanism can be adjusted at any time in the operation process of the equipment without replacing speed limiting mechanisms 100 of other specifications or changing materials of non-Newtonian fluid, so that the working efficiency is greatly improved.

As a further preferable aspect of the present embodiment, the stirring mechanism 130 may further include:

the sliding sleeve 131 is sleeved on the rotating shaft 120 and is provided with a sliding groove 136;

the sliding block 132 is embedded in the sliding groove 136 and can axially move relative to the sliding groove 136, and the first stirring blade 135 is connected with the sliding block 132;

one end of the connecting rod 133 is hinged with the sliding block 132, and the other end of the connecting rod 133 is hinged with the rotating shaft 120, so that the sliding block 132 is driven to move axially when the connecting rod 133 swings;

the elastic element 134 has one end connected to the rotating shaft 120 and the other end connected to the sliding block 132, and is configured to provide an axial pulling force between the rotating shaft 120 and the sliding block 132.

As shown in fig. 7, the sliding block 132 is embedded in the sliding groove 136 and can slide relative to the sliding sleeve 131, the sliding sleeve 131 can move and rotate relative to the rotating shaft 120, the sliding groove 136 can be a dovetail groove or a dovetail groove, and the sliding block 132 is matched with the dovetail groove to prevent the sliding block 132 from separating from the sliding groove 136. The elastic element 134 may be implemented by a tension spring, as shown in fig. 8-9, one end of the elastic element 134 is connected to the rotating shaft 120, the other end is connected to the sliding block 132, in order to facilitate connection with the rotating shaft 120, an elastic element connecting portion 122 may be disposed on the rotating shaft 120, one end of the elastic element 134 is connected to the rotating shaft 120 through the elastic element connecting portion 122, and through the elastic element 134, the sliding block 132 and the rotating shaft 120 have an axial pretension force and are axially constrained, so as to prevent the sliding block 132 from moving toward one end connected to the rotating device, that is, prevent the sliding block 132 from moving toward the right side of fig. 9.

The connecting rod 133 is hinged to the sliding block 132 and the rotating shaft 120, and when the connecting rod 133 swings, the sliding block 132 is driven to move, but the moving distance is limited, because the connecting rod is constrained by the elastic member 134, under the condition that the connecting rod 133 rotates within the preset range, because the resistance borne by the first stirring blade 135 is within the preset range, the load borne by the elastic member 134 is within the range of the elastic member 134, the elastic member 134 cannot deform and can keep a static state, at this time, the first stirring blade 135 cannot move axially and is in a normal state, and the sliding sleeve 131 and the rotating shaft 120 do not rotate relatively. When the output shaft 320 rotates anticlockwise and excessively, the sliding sleeve 131 rotates anticlockwise due to the resistance of the first stirring blade 135, so that the connecting rod 133 swings anticlockwise and pushes the sliding sleeve 131 to move forwards, that is, as shown in fig. 5, the sliding sleeve 131 moves to the left, and the sliding sleeve rubs against the inner wall of the output shaft 320, so that the damping effect is further enhanced.

As a further preferred feature of the present embodiment, the speed limiting mechanism 100 may further include a friction mechanism 150, disposed between the inner wall of the output shaft 320 and the stirring mechanism 130, for generating friction in the friction mechanism 150 to reduce the rotation speed when the rotation speed of the output shaft 320 is greater than a preset value.

Specifically, as shown in fig. 5, the friction mechanism 150 may be a friction plate or a brake pad, and is disposed between the inner wall of the output shaft 320 and the slider 132, when the rotation speed of the output shaft 320 is greater than a preset value, the slider 132 moves leftward to generate friction with the friction mechanism 150, so as to reduce the rotation speed of the slider 132, that is, reduce the rotation speed of the output shaft 320.

As a further preferable aspect of the present embodiment, in order to more stably and continuously maintain the uniform rotation, a stopper mechanism 160 may be provided, which includes:

a limiting ring 121 arranged on the rotating shaft 120;

the axial limiting mechanism 162 is coaxially disposed on the rotating shaft 120 and located on the inner wall of the output shaft 320, and the sliding sleeve 131 is located between the limiting ring 121 and the axial limiting mechanism 162.

As shown in fig. 4 and 5, in order to more stably and continuously maintain uniform rotation and prevent axial play, an axial limiting mechanism 162 is disposed on an inner wall of the output shaft 320 to limit the output shaft 320 to move rightward during rotation. The axial stop mechanism 162 is preferably a thrust bearing. By arranging the limiting ring 121 on the rotating shaft, the sliding sleeve 131 is positioned between the limiting ring 121 and the axial limiting mechanism 162, so that the sliding sleeve 131 is prevented from moving left and right in the rotating process of the rotating shaft 120. Therefore, the axial limiting mechanism 162 enables the rotating shaft 120 to rotate only but not move axially, so as to maintain the axial relative position of the rotating shaft 120 in the output shaft 320, thereby more stably maintaining uniform rotation.

In order to achieve a better limiting effect, the limiting mechanism 160 may further include:

the radial limiting mechanism 163 is coaxially disposed on the inner wall of the output shaft 320, and is used for preventing the slider 132 from moving outwards.

As shown in fig. 4 and 5, in order to prevent the sliding block 132 from moving radially outward due to centrifugal force during the rotation process, and even cause the sliding block 132 to be locked in the sliding slot 136 and be difficult to move, a radial limiting mechanism 163 is provided to prevent the sliding block 132 from moving outward, and the radial limiting mechanism 163 may be implemented by using a radial bearing, such as a deep groove ball bearing.

Second embodiment

Referring to fig. 10 to 14, the present embodiment is mainly different from the first embodiment in that the stirring mechanism 130 and the adjusting mechanism 140 with different structures are adopted, and the arrangement of the output shaft 320, the non-newtonian fluid, the connection of the rotating shaft 120 and the stirring operation principle and the beneficial effects of the first stirring blade 135 are the same as those of the first embodiment, and the following description mainly describes the differences.

The stirring mechanism 130 of this embodiment employs two radially and uniformly distributed first stirring blades 135, which further include:

the sliding sleeve 131 is sleeved on the rotating shaft 120, and a sliding groove 136 is formed in the sliding sleeve;

the sliding block 132 is embedded in the sliding groove 136 and can move radially relative to the sliding groove 136, and the first stirring blade 135 is connected with the sliding block 132;

a cam portion 138 disposed on the rotating shaft 120 for driving the sliding block 132 to move radially when the sliding sleeve 131 rotates relatively to the rotating shaft 120;

and one end of the elastic element 134 is connected with the rotating shaft 120, and the other end of the elastic element is connected with the sliding block 132, so as to provide a pulling force between the rotating shaft 120 and the sliding block 132.

The sliding block 132 is embedded in the sliding groove 136 and can slide radially relative to the sliding sleeve 131, and the sliding sleeve 131 can rotate relative to the rotating shaft 120. The elastic element 134 may be implemented by a tension spring, the elastic element 134 is transversely disposed, one end of the elastic element 134 is connected to the rotating shaft 120, the other end of the elastic element 134 is connected to the sliding block 132, in order to facilitate connection with the rotating shaft 120, a pin may be disposed on the rotating shaft 120, one end of the elastic element 134 is hooked on the pin, and the elastic element 134 enables a circumferential pretension force to be provided between the sliding block 132 and the rotating shaft 120, so that the sliding block 132 and the sliding sleeve 131 are circumferentially constrained to prevent from rotating relative to the rotating shaft 120.

The operation principle of the present embodiment is explained with reference to fig. 11 and 14:

the cam portion 138 is fixed on the rotating shaft 120, the slider 132 contacts with the cam portion 138, and when the output shaft 320 rotates counterclockwise at a slow speed, because the resistance borne by the first stirring vane 135 is within a preset range, the load borne by the elastic member 134 is within the self range, the elastic member 134 does not deform and keeps synchronous with the rotating shaft 120, at this time, the first stirring vane 135 does not move radially, and is in a normal state, and the sliding sleeve 131, the first stirring vane 135 and the rotating shaft 120 are relatively stationary. When the speed exceeds a set speed, the resistance borne by the first stirring vane 135 increases, and when the resistance is large to a certain degree, the elastic member 134 is stretched after the tensile force of the elastic member 134 is overcome, so that the sliding sleeve 131 generates relative movement with respect to the rotating shaft 120, and when the output shaft 320 rotates counterclockwise, the sliding sleeve 131 also rotates counterclockwise, and under the action of the cam portion 138, the sliding block 132 is pushed to move radially outward, so as to rub against the friction mechanism 150, thereby further improving the damping, and achieving the effect of speed reduction.

In order to make the movement of the slider 132 smoother, a roller 139 may be disposed on the slider 132, the roller 139 may be rotatably disposed on the slider 132, and may be connected to the slider 132 by a pin as shown in fig. 11, and an outer surface of the roller 139 may contact the cam portion 138. The sliding friction of the slide block 132 relative to the cam part 138 is changed into rolling friction through the roller 139, which saves labor, reduces abrasion and prolongs the service life.

The friction mechanism 150 of this embodiment may be a friction disk, and the outer side of the friction disk is connected to the inner wall of the output shaft 320, and the inner side is used for the sliding block 132 to rub, when the sliding block 132 is moved radially outward, thereby rubbing with the friction disk.

In order to overcome the centrifugal force generated by the sliding blocks 132 during rotation, one or more centrifugal tension springs 165 may be disposed and radially disposed with respect to the rotating shaft 120, one end of each centrifugal tension spring 165 is connected to one sliding block 132, and the other end of each centrifugal tension spring 165 is connected to the rotating shaft 120, and as shown in fig. 13, one centrifugal tension spring 165 may be used to hook two sliding blocks 132.

The adjustment mechanism 140 of the present embodiment may adopt a structure as shown in fig. 12 and 13:

referring to fig. 12 and 13, a specific structure of the adjustment mechanism 140 is shown, which includes:

the adjusting shaft 144 is arranged in the rotating shaft 120, and an adjusting groove 145 is formed in the adjusting shaft 144;

the swing rod 146 is clamped in the adjusting groove 145, the first stirring blade 135 is provided with a circular blade handle, and the blade handle penetrates through the sliding block 132 and then is connected with the swing rod 146, so that the angle of the first stirring blade 135 can be adjusted when the swing rod 146 swings;

the adjusting operation member 142 is connected to the adjusting shaft 144 and the second end cap 240, and is used for driving the adjusting shaft 144 to move axially relative to the second end cap 240, so as to drive the swing link 146 to swing.

As shown in fig. 12, the rotating shaft 120 has a circular inner hole therein for accommodating the adjusting shaft 144, the adjusting shaft 144 is rotatable and axially movable in the rotating shaft 120, and an adjusting groove 145 is formed at an end of the adjusting shaft 144 adjacent to the sliding block 132, and the adjusting groove 145 is an annular ring-shaped groove for accommodating the swing link 146.

The first mixing blade 135 has a circular shank at its root, the shank passes through the slider 132 and can rotate and move relative to the slider 132, the swing link 146 is disposed at the lower portion of the shank, protrudes outward relative to the shank, and has a hook portion facing downward and inserted into the adjustment groove 145, so that when the adjustment shaft 144 is moved axially, the swing link 146 is caused to swing, thereby causing the first mixing blade 135 to swing, and adjusting the area of the first mixing blade 135 for mixing the non-newtonian fluid, thereby adjusting the resistance.

However, the structure of the adjustment operation member 142 according to the first embodiment may be other manual operation members or electric operation members, or may be a structure as shown in fig. 10, in which the adjustment shaft 144 is driven to move when the adjustment operation member 142 is moved.

Therefore, by adopting the adjusting mechanism 140, the resistance of the first stirring blade 135 can be adjusted at any time in the operation process of the equipment, that is, the speed-limiting value of the speed-limiting mechanism 100 is adjusted, so that the speed-limiting mechanism 100 has a larger adjusting range, and the application range is wider and more flexible. And the speed limiting mechanism can be adjusted at any time in the operation process of the equipment without replacing speed limiting mechanisms 100 of other specifications or changing materials of non-Newtonian fluid, so that the working efficiency is greatly improved.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that there are no specific structures but a few objective structures due to the limited character expressions, and that those skilled in the art may make various improvements, decorations or changes without departing from the principle of the invention or may combine the above technical features in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims

1. A parallel shaft speed reducer, comprising:

a housing (200) having an accommodation space;

the transmission mechanism (300) is arranged in the accommodating space of the shell (200), the transmission mechanism (300) comprises an input shaft (310) and an output shaft (320) meshed with the input shaft (310), and the output shaft (320) is provided with the accommodating space;

and the speed limiting mechanism (100) is arranged in the accommodating space of the output shaft (320) and is used for reducing the rotating speed of the output shaft (320) when the output shaft (320) is larger than a preset value.

2. The parallel shaft speed reducer according to claim 1, wherein the speed limiting mechanism (100) comprises:

one end of the rotating shaft (120) is connected into the output shaft (320), the other end of the rotating shaft is connected with the shell (200), and the rotating shaft and the shell (200) are relatively fixed;

the stirring mechanism (130) is arranged on the rotating shaft (120), and the stirring mechanism (130) is provided with a first stirring blade (135);

and the non-Newtonian fluid is hermetically arranged in the accommodating space of the output shaft (320).

3. The parallel shaft speed reducer according to claim 2, wherein the speed limiting mechanism (100) further comprises:

and the adjusting mechanism (140) is arranged on the rotating shaft (120) and is used for adjusting the fluid resistance received by the first stirring blade (135) when the output shaft (320) rotates.

4. The parallel shaft speed reducer according to claim 2, wherein the speed limiting mechanism (100) further comprises:

and the friction mechanism (150) is arranged between the inner wall of the output shaft (320) and the stirring mechanism (130) and is used for enabling the friction mechanism (150) to generate friction so as to reduce the rotating speed when the rotating speed of the output shaft (320) is greater than a preset value.

5. The parallel shaft speed reducer according to claim 3, wherein the adjusting mechanism (140) penetrates one end of the output shaft (320), and the adjusting mechanism (140) has a second stirring blade that overlaps the first stirring blade (135) and is relatively movable.

6. The parallel shaft reducer of claim 5, wherein the adjustment mechanism (140) further comprises:

the adjusting plate (141) is provided with a circular ring part and the second stirring blade, the circular ring part is sleeved on the rotating shaft (120), and one end of the circular ring part is connected with the second stirring blade;

and the adjusting operation part (142) is connected with the other end of the circular ring part, is positioned outside the shell (200), and is used for driving the second stirring blade to axially move relative to the first stirring blade (135) so as to adjust the relative position of the second stirring blade and the first stirring blade (135).

7. The parallel-axis reducer according to any of claims 2-4, wherein the stirring mechanism (130) further comprises:

the sliding sleeve (131) is sleeved on the rotating shaft (120), and a sliding groove (136) is formed in the sliding sleeve (131);

the sliding block (132) is embedded in the sliding groove (136) and can axially move relative to the sliding groove (136), and the first stirring blade (135) is connected with the sliding block (132);

one end of the connecting rod (133) is hinged with the sliding block (132), the other end of the connecting rod is hinged with the rotating shaft (120), and the connecting rod (133) drives the sliding block (132) to move axially when swinging;

and one end of the elastic piece (134) is connected with the rotating shaft (120), and the other end of the elastic piece is connected with the sliding block (132) and is used for providing axial pulling force between the rotating shaft (120) and the sliding block (132).

8. The parallel shaft reducer according to claim 4, wherein the friction mechanism (150) is a friction disk, and is disposed between an inner wall of the output shaft (320) and the stirring mechanism (130).

9. The parallel shaft speed reducer according to claim 5 or 6, wherein a second adjusting hole (143) is formed in the second stirring blade, and a first adjusting hole (137) is formed in the first stirring blade (135).

10. The parallel axis reducer of claim 3, wherein the stirring mechanism (130) further comprises:

the sliding sleeve (131) is sleeved on the rotating shaft (120), and a sliding groove (136) is formed in the sliding sleeve;

the sliding block (132) is embedded in the sliding groove (136) and can move radially relative to the sliding groove (136), and the first stirring blade (135) is connected with the sliding block (132);

the cam part (138) is arranged on the rotating shaft (120) and is used for driving the sliding block (132) to move in the radial direction when the sliding sleeve (131) rotates relative to the rotating shaft (120);

and one end of the elastic piece (134) is connected with the rotating shaft (120), and the other end of the elastic piece is connected with the sliding block (132) and is used for providing a pulling force between the rotating shaft (120) and the sliding block (132).

11. The parallel shaft reducer of claim 9, wherein the adjustment mechanism (140) comprises:

the adjusting shaft (144) is arranged in the rotating shaft (120), and an adjusting groove (145) is formed in the adjusting shaft (144);

the swing rod (146) is clamped in the adjusting groove (145), the first stirring blade (135) is provided with a circular blade handle, and the blade handle penetrates through the sliding block (132) and then is connected with the swing rod (146) and is used for adjusting the angle of the first stirring blade (135) when the swing rod (146) swings;

and the adjusting operating part (142) is connected with the adjusting shaft (144) and the shell (200) and is used for driving the adjusting shaft (144) to axially move relative to the shell (200) so as to drive the swing rod (146) to swing.