CN112096796A - Planetary reducer - Google Patents

Abstract

The invention discloses a planetary reducer, which comprises a base provided with a cavity, an input shaft and a first rotary table which are rotatably mounted on the base in a uniform mode, a planetary wheel rotatably mounted on the first rotary table, a gear mounted on the planetary wheel, a second rotary table fixed relative to the first rotary table, and an output shaft mounted on the second rotary table, wherein the input shaft and the first rotary table are rotatably mounted on the base; a circular ring is arranged on the inner wall of the cavity, and a rack is annularly arranged on the side surface of the inner circumference of the circular ring; the circumference side of input shaft and the circumference side contact of planet wheel, gear and the coaxial rotation of planet wheel, gear and rack meshing, input shaft, first carousel, ring, second carousel to and the coaxial setting of output shaft, the axis of input shaft is parallel with the axis of planet wheel. The planetary gear can be driven to rotate by the friction force between the input shaft and the planetary gear, so that the gear is driven to rotate and roll along the rack at the same time, the purpose of speed reduction is achieved, and the speed reducer belongs to the technical field of speed reducers.

Description

Planetary reducer

Technical Field

The invention relates to the technical field of speed reducers, in particular to a planetary speed reducer.

Background

The reduction gear serves to match the rotational speed and the torque transmission between the prime mover and the working machine or the actuator, and is used in modern machines in a very wide range of applications. At present, the common speed reducer is realized by sequentially meshing two or more gears with different sizes, and compared with other speed reducers, the gear speed reducer is large in size, small in space, poor in anti-seismic performance and easy to break at tooth roots.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention aims to: the invention provides a planetary reducer, which can drive a planetary gear to rotate through the friction force between an input shaft and the planetary gear, so that the gear is driven to rotate and roll along a rack at the same time, and the aim of reducing speed is fulfilled.

In order to achieve the purpose, the invention adopts the following technical scheme:

a planetary reducer comprises a base provided with a cavity, an input shaft and a first rotary table which are rotatably mounted on the base in a uniform mode, a planetary wheel rotatably mounted on the first rotary table, a gear mounted on the planetary wheel, a second rotary table fixed relative to the first rotary table, and an output shaft mounted on the second rotary table; a circular ring is arranged on the inner wall of the cavity, and a rack is annularly arranged on the inner circumferential side surface of the circular ring; the circumference side of the input shaft is in contact with the circumference side of the planet wheel, the gear and the planet wheel rotate coaxially, the gear is meshed with the rack, the input shaft, the first rotating disc, the circular ring, the second rotating disc and the output shaft are coaxially arranged, and the axis of the input shaft is parallel to the axis of the planet wheel.

Preferably, the planetary reducer further comprises a connecting shaft; one end of the connecting shaft is fixedly connected with the first rotary disc, the other end of the connecting shaft is fixedly connected with the second rotary disc, and the planet wheel and the gear are sequentially and fixedly arranged on the connecting shaft along the axis direction of the connecting shaft.

Preferably, the number of the planet wheels and the number of the gears are multiple, the planet wheels and the gears correspond to each other one to one, all the gears are meshed with the rack, all the planet wheels are distributed along the circumferential direction of the input shaft, and the circumferential side surfaces of all the planet wheels are in contact with the circumferential side surface of the input shaft.

Preferably, the number of the planet wheels is three, the three planet wheels correspond to the three gears in a one-to-one manner, the three gears are meshed with the rack, the three planet wheels are uniformly distributed along the circumferential direction of the input shaft, and the circumferential side surfaces of the three planet wheels are in contact with the circumferential side surface of the input shaft.

Preferably, the planet wheel and the gear are integrally formed with the connecting shaft.

Preferably, the planetary reducer further comprises a hoop sleeve; the hoop sleeves are sleeved on all the planet wheels and are in contact with the circumferential side faces of all the planet wheels.

Preferably, the planetary reducer further comprises a reinforcing shaft; one end of the reinforcing shaft is fixedly connected with the first rotating disc, and the other end of the reinforcing shaft is fixedly connected with the second rotating disc.

Preferably, the planetary reducer further comprises a first end cover and a second end cover; the base is also provided with an input port and an output port; the input port and the output port are communicated with the cavity, the first end cover is fixed at the input port, the input shaft is rotatably installed on the first end cover, the second end cover is fixed at the output port, and the output shaft is fixed on the second end cover.

Preferably, the first end cap is provided with a first bearing, the input shaft is rotatably mounted on the first end cap through the first bearing, the second end cap is provided with a second bearing, and the output shaft is rotatably mounted on the second end cap through the second bearing.

Preferably, the output shaft is provided with gear teeth on a circumferential side surface thereof.

Compared with the prior art, the invention has the beneficial effects that: this planetary reducer passes through input shaft and planet wheel contact, and the input shaft makes the planet wheel rotate through rolling friction power, and the gear is coaxial and synchronous rotation with the planet wheel, rolls on the rack when the gear rotation, realizes slowing down. The planetary reducer is compact in structure, saves space, and is stable in structure and strong in bearing capacity when rotating at a high speed.

Drawings

Fig. 1 is a schematic structural view of a planetary reduction gear.

Fig. 2 is an exploded view of the planetary reducer.

FIG. 3 is a schematic view of another view of FIG. 2

In the figure, 1 is a base, 2 is a first turntable, 3 is a planet wheel, 4 is a gear, 5 is a second turntable, 6 is an input shaft, 7 is an output shaft, 8 is a connecting shaft, 9 is a reinforcing shaft, 10 is a hoop, 11 is a first end cover, 12 is a second end cover, 13 is a ring, 14 is a rack, 15 is a first bearing, 16 is a second bearing, 17 is a rotating shaft, 18 is a bearing groove, 19 is a first snap ring, and 20 is a second snap ring.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning 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.

As shown in fig. 1 to 3, the present embodiment provides a planetary reducer, which includes a base 1 provided with a cavity, an input shaft 6 and a first rotating disk 2 both rotatably mounted on the base 1, a planetary gear 3 rotatably mounted on the first rotating disk 2, a gear 4 mounted on the planetary gear 3, a second rotating disk 5 fixed relative to the first rotating disk 2, and an output shaft 7 mounted on the second rotating disk 5; the input shaft, the first rotating disc, the circular ring, the second rotating disc and the output shaft are coaxially arranged, the axis of the input shaft is parallel to the axis of the planet wheel, the inner wall of the cavity is provided with the circular ring 13, and the inner circumferential side surface of the circular ring 13 is annularly provided with the rack 14; the circumferential side surface of the input shaft 6 is in contact with the circumferential side surface of the planetary gear 3, the gear 4 rotates coaxially with the planetary gear 3, and the gear 4 is meshed with the rack 14. The planet wheel 3 and the gear 4 rotate coaxially and synchronously, and the first rotating disk 2 and the second rotating disk 5 rotate coaxially and synchronously. The base 1 is fixedly installed, a circular hole is formed in the base 1 in the cavity, and the circular ring 13 is arranged on the inner wall of the cavity and integrally formed with the inner wall of the cavity. The right end of input shaft 6 stretches into the cavity and is connected with the circumference side of planet wheel 3, relies on frictional force to drive planet wheel 3 and rotates when input shaft 6 rotates, utilizes the friction of input shaft 6 and planet wheel 3 to carry out certain consumption to the kinetic energy of input shaft 6, and the diameter of input shaft 6 is less than the diameter of planet wheel 3 simultaneously, realizes slowing down jointly. The planet wheel 3 drives the gear 4 to rotate, the gear 4 rolls along the rack 14 when rotating, the gear 4 makes circular motion around the inner wall of the cavity, the gear 4 drives the first turntable 2 and the second turntable 5 to rotate when making circular motion, the output shaft 7 is fixed at the center of the second turntable 5, and finally the second turntable 5 drives the output shaft 7 to rotate. The input shaft 6, the first turntable 2 and the second turntable 5 all rotate coaxially.

Specifically, in one embodiment, the planetary reducer further comprises a connecting shaft 8; one end of the connecting shaft 8 is fixedly connected with the first rotating disc 2, the other end of the connecting shaft 8 is fixedly connected with the second rotating disc 5, and the planet wheel 3 and the gear 4 are sequentially and fixedly arranged on the connecting shaft 8 along the axial direction of the connecting shaft 8. All be equipped with first through-hole on first carousel 2 and the second carousel 5, the first through-hole of first carousel 2 and the first through-hole of second carousel 5 are passed respectively at the both ends of even axle 8, and first carousel 2 drives second carousel 5 through even axle 8 and rotates.

Specifically, in one embodiment, the diameter of the planet wheel 3 is smaller than that of the gear 4, so that the stress on the planet wheel 3 and the gear 4 is more uniform, the width of the planet wheel 3 is equal to that of the gear 4, and when the gear 4 is meshed with the rack 14, the circumferential side surface of the planet wheel 3 does not interfere with the rack 14 on the inner wall of the cavity.

Specifically, in one embodiment, a rotating shaft 17 is fixedly arranged on an end surface of the first rotating disk 2, a first shaft hole is arranged on the rotating shaft 17, a second shaft hole communicated with the first shaft hole is arranged on the end surface of the first rotating disk 2, the diameter of the first shaft hole is larger than or equal to that of the input shaft 6, and the input shaft 6 sequentially penetrates through the first shaft hole and the second shaft hole and then contacts with the circumferential side surface of the planet wheel 3. When the input shaft 6 rotates, the rotation direction of the input shaft 6 is opposite to that of the gear 4, and the rotation direction of the input shaft 6 is the same as that of the first rotary disk 2.

Specifically, in one embodiment, there are a plurality of planetary wheels 3 and gears 4, the plurality of planetary wheels 3 and the plurality of gears 4 correspond one to one, all the gears 4 are engaged with the rack 14, all the planetary wheels 3 are uniformly distributed along the circumferential side surface of the input shaft 6, and the circumferential side surface of all the planetary wheels 3 is in contact with the circumferential side surface of the input shaft 6. There are also a plurality of connecting shafts 8, and a plurality of connecting shafts 8 correspond to a plurality of planetary gears 3 and a plurality of gears 4 one by one. When the input shaft 6 rotates, all the planet wheels 3 are driven to rotate, so that all the gears 4 are driven to rotate and roll along the rack 14.

Specifically, in one embodiment, there are three planet wheels 3 and three gears 4 in one-to-one correspondence, three gears 4 are all meshed with the rack 14, three planet wheels 3 are evenly distributed along the circumferential side surface of the input shaft 6, and the circumferential side surface of each planet wheel 3 is in contact with the circumferential side surface of the input shaft 6.

Specifically, in one embodiment, the planet wheel 3 and the gear 4 are integrally formed with the connecting shaft 8, so that the rotating strength is ensured.

Specifically, in one embodiment, the planetary reducer further includes a sleeve 10; the hoop 10 is sleeved on all the planet wheels 3 and is in contact with the circumferential side surfaces of all the planet wheels 3. The hoop 10 is in a ring 13 shape, the inner wall of the hoop 10 is tightly contacted with the circumferential side surfaces of all the planet wheels 3, and the hoop 10 compresses all the planet wheels 3 towards the axis direction of the input shaft 6, so that the rolling friction force between the input shaft 6 and the planet wheels 3 is increased.

Specifically, in one embodiment, the planetary reducer further comprises a reinforcing shaft 9; one end of the reinforcing shaft 9 is fixedly connected with the first rotary table 2, and the other end of the reinforcing shaft 9 is fixedly connected with the second rotary table 5. All be equipped with the second through-hole on first carousel 2 and the second carousel 5, consolidate the second through-hole that the both ends of axle 9 passed first carousel 2 and the second through-hole of second carousel 5 respectively, consolidate axle 9 and make the joint strength between first carousel 2 and the second carousel 5 better for the rotation of first carousel 2 and second carousel 5 is more synchronous.

Specifically, in one embodiment, there are a plurality of reinforcing shafts 9, and one reinforcing shaft 9 is disposed between two adjacent connecting shafts 8.

Specifically, in one embodiment, the diameter of the reinforcing shaft 9 is 2-3 times of the diameter of the connecting shaft 8, so that the strength of the reinforcing shaft 9 is ensured, meanwhile, the reinforcing shaft 9 shares the shear stress applied to the connecting shaft 8, so that the service life of the connecting shaft 8 is longer, the reinforcing shaft 9 can rotate, and when the first turntable 2 drives the second turntable 5 to rotate, a part of the shear stress can be eliminated through the rotation of the reinforcing shaft 9.

Specifically, in one embodiment, the planetary reducer further includes a first end cover 11 and a second end cover 12; the base 1 is also provided with an input port and an output port; the input port and the output port are communicated with the cavity, the first end cover 11 is fixed at the input port, the input shaft 6 is rotatably mounted on the first end cover 11, the second end cover 12 is fixed at the output port, and the output shaft 7 is fixed on the second end cover 12. The input port and the output port are respectively located at two ends of the axis direction of the round hole-shaped cavity, and the planet wheel 3, the first rotating disc 2, the second rotating disc 5 and the gear 4 are all located between the first end cover 11 and the second end cover 12.

Specifically, in one embodiment, the first end cap 11 is provided with a first bearing 15, the input shaft 6 is rotatably mounted on the first end cap 11 through the first bearing 15, the second end cap 12 is provided with a second bearing 16, and the output shaft 7 is rotatably mounted on the second end cap 12 through the second bearing 16.

Specifically, in one embodiment, the diameter of the output shaft 7 is equal to the inner diameter of the second bearing 16. The output shaft 7 is mounted directly on the second bearing 16.

In particular, in one embodiment, the rotation shaft 17 of the first turntable 2 is rotatably mounted on the first bearing 15. The first bearing 15 provides a rotational support for the rotation of the rotation shaft 17, so that the first rotary table 2 can rotate more stably.

Specifically, in one embodiment, the length of the rotating shaft 17 in the axial direction is 1.5-2 times the length of the first rotating disc 2 in the axial direction, that is, the width of the rotating shaft 17 is 1.5-2 times the width of the first rotating disc 2, and since the rotating shaft 17 is installed in the first bearing 15, the gravity of the first rotating disc 2, the rotating shaft 17 and the components (the planet wheels 3 and the gears 4) on the rotating discs are exerted on the first bearing 15 through the rotating shaft 17, and the width of the rotating shaft 17 is larger than the width of the first rotating disc 2, so that the force applied to the rotating shaft 17 can be better dispersed, and the strength of the rotating shaft 17 can be ensured.

Specifically, in one embodiment, the first end cap 11 and the second end cap 12 are both disc-shaped, a bearing groove 18 is disposed on one end surface of the first end cap 11 and one end surface of the second end cap 12, the bearing groove 18 is located at the center of the first end cap 11 or the second end cap 12, the first bearing 15 is installed in the bearing groove 18 of the first end cap 11, and the first bearing 15 is installed in the bearing groove 18 of the second end cap 12.

Specifically, in one embodiment, the bearing groove 18 of the first end cap 11 and the bearing groove 18 of the second end cap 12 are both communicated with the cavity, so that the first end cap 11 and the second end cap 12 seal the cavity, and the first bearing 15 and the second bearing are sealed in a sealed area formed by the first end cap 11, the second end cap 12 and the cavity together, so as to prevent the first bearing 15 and the second bearing 16 from being polluted by dust and the like to affect the accuracy and the service life.

Specifically, in one embodiment, a first snap ring 19 is further disposed on an end surface of the first end cover 11, a second snap ring 20 is further disposed on an end surface of the second end cover 12, the bearing groove 18 of the first end cover 11 is located in the first snap ring 19, the bearing groove 18 of the second end cover 12 is located in the second snap ring 20, diameters of the first end cover 11 and the second end cover 12 are larger than a diameter of the cavity, a diameter of the sleeve 10 is equal to a diameter of the cavity, outer diameters of the first snap ring 19 and the second snap ring 20 are both equal to an inner diameter of the cavity, the first snap ring 19 is clamped at the input port and is in contact with one end surface of the sleeve 10, the other end surface of the sleeve 10 is in contact with one end surface of the circular ring 13, the second snap ring 20 is clamped at the output port and is in contact with the other end surface of the circular ring 13, and the sleeve 10 is positioned in the radial direction and the axial direction, so that.

Specifically, in one embodiment, the distance from the first snap ring 19 to the inner wall of the bearing groove 18 is 1-1.5 times the distance from the first snap ring 19 to the circumferential side surface of the first end cap 11, and the distance from the first snap ring 19 to the circumferential side surface of the first end cap 11 is closer, so that the degree of the first end cap 11 is ensured. The distance from the second snap ring 20 to the inner wall of the bearing groove 18 is 1-1.5 times the distance from the second snap ring 20 to the circumferential side of the second end cap 12, and the distance from the second snap ring 20 to the circumferential side of the second end cap 12 is closer, thereby ensuring the degree of the first end cap 11. The first snap ring 19 prevents radial movement of the first end cap 11 and the second snap ring 20 prevents radial movement of the second end cap 12.

Specifically, in one embodiment, the output shaft 7 is provided with gear teeth on a circumferential side surface thereof. The output shaft 7 is connected to an external device through gear teeth, so that the decelerated kinetic energy of the input shaft 6 is transmitted from the output shaft 7.

The working principle of the invention is as follows: when the input shaft rotates, the base is fixed, the input shaft drives the planet wheel to rotate through rolling friction force, the planet wheel drives the gear to rotate, the gear rolls along the rack in the process of rotating around the connecting shaft, and therefore the gear drives the first turntable and the second turntable to rotate, and finally the second turntable drives the output shaft to rotate.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (10)

1. A planetary reducer characterized in that: the device comprises a base provided with a cavity, an input shaft and a first rotary table which are rotationally mounted on the base, a planet wheel rotationally mounted on the first rotary table, a gear mounted on the planet wheel, a second rotary table fixed with the first rotary table, and an output shaft mounted on the second rotary table; a circular ring is arranged on the inner wall of the cavity, and a rack is annularly arranged on the inner circumferential side surface of the circular ring; the circumference side of the input shaft is in contact with the circumference side of the planet wheel, the gear and the planet wheel rotate coaxially, the gear is meshed with the rack, the input shaft, the first rotating disc, the circular ring, the second rotating disc and the output shaft are coaxially arranged, and the axis of the input shaft is parallel to the axis of the planet wheel.

2. A planetary reducer according to claim 1, wherein: the device also comprises a connecting shaft; one end of the connecting shaft is connected with the first rotary disc, the other end of the connecting shaft is connected with the second rotary disc, and the planet wheel and the gear are sequentially and fixedly arranged on the connecting shaft along the axis direction of the connecting shaft.

3. A planetary reducer according to claim 1, wherein: the planet wheels and the gears are all multiple, the planet wheels and the gears correspond to each other one by one, all the gears are meshed with the racks, all the planet wheels are distributed along the circumferential direction of the input shaft, and the circumferential side faces of the planet wheels are in contact with the circumferential side face of the input shaft.

4. A planetary reducer according to claim 2, wherein: the planet wheel with the gear all has threely the planet wheel with threely the gear one-to-one, threely the gear all with the rack toothing, threely the planet wheel is along the circumference evenly distributed of input shaft, threely the circumference side of planet wheel all with the circumference side contact of input shaft.

5. A planetary reducer according to claim 1, wherein: the planet wheel and the gear are integrally formed with the connecting shaft.

6. A planetary reducer according to claim 3, wherein: also comprises a hoop sleeve; the hoop sleeves are sleeved on all the planet wheels and are in contact with the circumferential side faces of all the planet wheels.

7. A planetary reducer according to claim 6, wherein: the device also comprises a reinforcing shaft; one end of the reinforcing shaft is connected with the first rotary table, and the other end of the reinforcing shaft is connected with the second rotary table.

8. A planetary reducer according to claim 1, wherein: the device also comprises a first end cover and a second end cover; the base is also provided with an input port and an output port; the input port and the output port are communicated with the cavity, the first end cover is fixed at the input port, the input shaft is rotatably installed on the first end cover, the second end cover is fixed at the output port, and the output shaft is fixed on the second end cover.

9. A planetary reducer according to claim 8, wherein: the first end cover is provided with a first bearing, the input shaft is rotatably arranged on the first end cover through the first bearing, the second end cover is provided with a second bearing, and the output shaft is rotatably arranged on the second end cover through the second bearing.

10. A planetary reducer according to claim 1, wherein: gear teeth are arranged on the circumferential side surface of the output shaft.

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