A composite 10,000 Nm high load-bearing compact precision reduction gear

Abstract

The present invention relates to a composite 10,000-Nm-class high-load compact precision reduction device, which is characterized in that: the planet carrier is fixed in a mounting cavity of a frame, the planet carrier has a center hole and three groups of bearing mounting holes evenly distributed around the circumference, an inner bearing mounting platform is provided at the center hole, and two outer bearing mounting platforms are provided on its outer ring; the input shaft cooperates with the inner bearing mounting platform through the input shaft support bearing; three crankshafts are supported in the three groups of bearing mounting holes through bearings installed at the ends of the two shafts; the three crankshafts are respectively meshed with the outer teeth on the input shaft through a synchronous wheel; two cycloid wheels are respectively rotatably matched with the eccentric outer circumferences on both sides of the three crankshafts through three driving holes; the pin gear housing is meshed with the outer rings of the two cycloid wheels through the pin gear pins, and cooperates with the two outer bearing mounting platforms through two supporting bearings; the output gear is rotationally supported in another mounting cavity of the frame, and meshes with the outer teeth of the pin gear housing. The present invention realizes parallel output, strong overload and compactness.

Description

Technical Field

[0001] The invention belongs to the field of precision mechanical transmission, and in particular relates to a composite 10,000-Nm-class high-load compact precision reduction device. Background Art

[0002] With the continuous improvement of equipment's requirements for rapid response, reliability and safety, rapid maneuvering equipment has gradually switched from hydraulic drive to electric drive. However, due to space limitations, strict requirements are placed on the structure of the electric drive. For load conditions above 10,000 Nm, motor + reduction equipment is required to meet the requirements of instantaneous high load and compact structure.

[0003] However, the traditional gear reducer is too large, the axial dimension of the planetary reducer is too long to meet the size requirements, the harmonic reducer cannot meet the requirements of large torque and strong overload, and the cycloid reducer can meet the load and width requirements, but the radial dimension is too large. Therefore, it is urgent to invent a parallel output, strong overload and compact precision reduction device to meet the torque requirements of more than 20000Nm. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a composite 10,000 Nm-class high-load compact precision reduction device.

[0005] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0006] A composite 10,000 Nm-class high-load compact precision reduction device, characterized in that it comprises a frame, an input shaft, an input shaft support bearing, a planet carrier, a crankshaft, a synchronous wheel, a cycloid wheel, a pin gear housing, an output gear, and an output gear support bearing;

[0007] The frame is composed of an outer shell and an outer shell cover which are fixedly connected; the frame has two parallel installation cavities on the left and right; the planet carrier is fixedly installed in one of the installation cavities in the frame; the planet carrier is a disc-shaped structure as a whole, a center hole is provided on the planet carrier, and an inner bearing mounting platform is provided at one end of the center hole close to the outer shell cover; three groups of bearing mounting holes are evenly distributed in the circumferential direction on the planet carrier with the axis of the center hole as the center, and two outer bearing mounting platforms are oppositely provided on the outer ring of the planet carrier;

[0008] The input shaft is a gear shaft with an inner spline hole and outer teeth, and the outer cylindrical surface of the input shaft is matched and connected with the inner bearing mounting platform of the planet carrier through the input shaft support bearing;

[0009] There are three crankshafts, each of which is composed of two eccentric outer circumferential parts arranged at 180 degrees opposite to each other and two coaxial shaft ends arranged outside the two eccentric outer circumferential parts; the three crankshafts are rotatably supported in three groups of bearing mounting holes on the planet carrier through bearings installed at the two shaft ends; a synchronous wheel is installed at one end of the three crankshafts close to the outer shell cover, and the three synchronous wheels are all meshed with the external teeth on the input shaft;

[0010] The cycloid wheel is composed of two pieces, and three driving holes are evenly arranged on the two pieces of cycloid wheels along the circumferential direction. The two pieces of cycloid wheels respectively form a relatively rotatable fit with the eccentric outer circumferences on both sides of the three crank shafts through the three driving holes;

[0011] The inner ring of the pin gear housing is evenly provided with pin gear pins along the circumferential direction, and the pin gear pins are engaged with the outer rings of the two cycloid wheels; the pin gear housing is matched with the two outer bearing mounting platforms on the planet carrier through the support bearings installed in the inner ring and located on both sides of the pin gear pins; the outer ring of the pin gear housing is provided with external teeth;

[0012] The output gear is arranged in another installation cavity of the frame. The output gear has a central spline hole and external teeth. The external teeth of the output gear and the external teeth of the pin gear housing form a tooth meshing. An output gear support bearing is installed on each side of the outer ring of the output gear on its external teeth. The two output gear support bearings form a rotatable support fit with the inner cavity of the frame; the central spline hole of the output gear forms a power output interface.

[0013] Furthermore: a driving sleeve is fixed in each driving hole on the cycloid wheel, and contacts the eccentric outer circle of the crank shaft through the driving sleeve.

[0014] Furthermore, the bearings installed at the two ends of the crankshaft are symmetrically arranged tapered bearings, and the ends of the crankshaft are connected to the synchronous wheel through splines.

[0015] The present invention has the following advantages and positive effects:

[0016] 1. The present invention adopts a transmission mode of primary planetary cycloid + secondary parallel teeth, which has the characteristics of small axial size, large speed ratio and high overload capacity of planetary cycloid transmission, realizes axial size control and load-bearing capacity guarantee, and meets the requirements of parallel output.

[0017] 2. The present invention fixes the planet carrier of the first-stage planetary cycloid part, adopts a pinion gear housing output mode, and designs the pinion gear housing into a gear form to realize modular input drive.

[0018] 3. The output end gear of the present invention adopts the method of central spline output and bearing support at both ends to ensure the output bearing strength and meet the torque requirements of more than 20000Nm.

[0019] 4. The present invention firstly adopts an internal involute cycloid transmission design to meet the large speed ratio while reducing the axial size of the reducer, which is 50% smaller than the traditional planetary transmission; at the same time, the pinion gear housing adopts an integrated design, and the original mounting flange part is designed as an external tooth structure, which reduces the previous installation links of the pinion gear housing and the gear while avoiding increasing the axial installation size and radial gear diameter, thereby realizing the miniaturization and compact design of the reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the transmission principle diagram of the present invention;

[0021] Figure 2 This is an appearance diagram of the present invention. Figure 1 ;

[0022] Figure 3 This is an appearance diagram of the present invention. Figure 2 ;

[0023] Figure 4 It is the internal structure diagram of the present invention;

[0024] Figure 5 is a plan view of the first-stage planetary cycloid mechanism of the present invention;

[0025] Figure 6 It is a longitudinal sectional view of the first-stage planetary cycloid mechanism of the present invention. DETAILED DESCRIPTION

[0026] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0027] A composite 10,000 Nm high load compact precision reduction gear, see Figure 1-6 The invention point is: it mainly includes a frame 7, an input shaft 1, an input shaft support bearing 9, a planetary carrier 10, a crank shaft 3, a synchronous wheel 2, a cycloid wheel 4, a pin gear housing 5, an output gear 6, and an output gear support bearing 8.

[0028] The frame is composed of an outer shell and an outer shell cover connected by screws. The frame is provided with left and right parallel installation cavities, and the shape of the installation cavities is cylindrical.

[0029] The planet carrier is fixedly installed in a mounting cavity in the frame, which is a fixing part. The planet carrier is composed of two coaxially arranged parts connected by screws. The planet carrier and the frame are positioned by pins and fixedly connected by screws. The planet carrier is a disc-shaped structure as a whole. A center hole is provided on the planet carrier, and an inner bearing mounting platform is provided at one end of the center hole close to the outer shell cover. Three groups of bearing mounting holes are evenly distributed in the circumferential direction on the planet carrier with the axis of the center hole as the center, and an outer bearing mounting platform is provided on each outer ring of the two parts of the planet carrier.

[0030] The input shaft is a gear shaft with an internal spline hole and external teeth. The outer cylindrical surface (non-toothed portion) of the input shaft is matched and connected with the inner bearing mounting platform of the planet carrier through an input shaft support bearing, and the input shaft is coaxially supported on the planet carrier.

[0031] There are three crankshafts, each of which is composed of two eccentric outer circumferences and two coaxially arranged shaft ends arranged outside the two eccentric outer circumferences, and the two eccentric outer circumferences are arranged 180 degrees opposite to each other. The three crankshafts are rotatably supported in three sets of bearing mounting holes on the planet carrier through bearings installed at the two shaft ends. A synchronous wheel is installed at the shaft end of each of the three crankshafts close to the outer shell cover, and the three synchronous wheels are meshed with the external teeth on the input shaft to transmit the rotation of the input shaft to the three crankshafts through tooth meshing.

[0032] The cycloid wheel consists of two pieces, and three driving holes are evenly distributed along the circumferential direction on the two cycloid wheels. A driving sleeve is fastened in each driving hole. The two cycloid wheels form a relatively rotatable fit with the eccentric outer circle parts on both sides of the three crank shafts through the three driving holes.

[0033] The inner ring of the pin gear housing is evenly equipped with pin gear pins along the circumferential direction, and the pin gear pins form a tooth mesh with the outer rings of the two cycloid wheels. The pin gear housing is matched with the two outer bearing mounting platforms on the planet carrier through the support bearings installed in the inner ring on both sides of the pin gear pins. External teeth are arranged on the outer ring of the pin gear housing.

[0034] The output gear is arranged in another mounting cavity of the frame, and has a central spline hole and external teeth. The external teeth of the output gear and the external teeth of the pin gear housing form a tooth meshing, and an output gear support bearing is installed on each side of the outer ring of the output gear on the outer teeth, and a rotatable support is formed with the inner cavity of the frame through the two output gear support bearings. The central spline hole of the output gear forms a power output interface.

[0035] Combined with the above technical solution, the advantages of this reduction gear are:

[0036] Existing high-load reducers often use a design method of increasing the tooth width of large-module gears. If the requirement of a large speed ratio is considered, the final consequence is that the size and weight of the reducer are large, and the transmission accuracy is low. The present invention adopts an internal planetary cycloid transmission, an integrated design of the first-stage output and the second-stage input, and an external large-module gear transmission form, which avoids the increase in axial size due to the large speed ratio and minimizes the radial size of the large-module gear to the maximum extent possible.

[0037] The working principle of this composite 10,000 Nm high load-bearing compact precision reduction gear is:

[0038] Connect an external motor to the input shaft to drive the input shaft to rotate. The motion and torque drive the crankshaft to rotate through the input shaft, thereby driving the cycloid wheel to make planar motion. At the same time, the cycloid wheel and the pinion housing engage with each other and drive the pinion housing to rotate. Finally, through the meshing of gears, the motion and amplified torque are transmitted through the output gear.

[0039] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A composite 10,000 Nm high load-bearing compact precision reduction gear, characterized by: It includes a frame, an input shaft, an input shaft supporting bearing, a planet carrier, a crankshaft, a synchronous wheel, a cycloid wheel, a pin gear housing, an output gear, and an output gear supporting bearing; The frame is composed of an outer shell and an outer shell cover which are fixedly connected; the frame has two parallel installation cavities on the left and right; the planet carrier is fixedly installed in one of the installation cavities in the frame; the planet carrier is a disc-shaped structure as a whole, a center hole is provided on the planet carrier, and an inner bearing mounting platform is provided at one end of the center hole close to the outer shell cover; three groups of bearing mounting holes are evenly distributed in the circumferential direction on the planet carrier with the axis of the center hole as the center, and two outer bearing mounting platforms are oppositely provided on the outer ring of the planet carrier; The input shaft is a gear shaft with an inner spline hole and outer teeth, and the outer cylindrical surface of the input shaft is matched and connected with the inner bearing mounting platform of the planet carrier through the input shaft support bearing; There are three crankshafts, each of which is composed of two eccentric outer circumferential parts arranged at 180 degrees opposite to each other and two coaxial shaft ends arranged outside the two eccentric outer circumferential parts; the three crankshafts are rotatably supported in three groups of bearing mounting holes on the planet carrier through bearings installed at the two shaft ends; a synchronous wheel is installed at one end of the three crankshafts close to the outer shell cover, and the three synchronous wheels are all meshed with the external teeth on the input shaft; The cycloid wheel is composed of two pieces, and three driving holes are evenly arranged on the two pieces of cycloid wheels along the circumferential direction. The two pieces of cycloid wheels respectively form a relatively rotatable fit with the eccentric outer circumferences on both sides of the three crank shafts through the three driving holes; The inner ring of the pin gear housing is evenly provided with pin gear pins along the circumferential direction, and the pin gear pins are engaged with the outer rings of the two cycloid wheels; the pin gear housing is matched with the two outer bearing mounting platforms on the planet carrier through the support bearings installed in the inner ring and located on both sides of the pin gear pins; the outer ring of the pin gear housing is provided with external teeth; The output gear is arranged in another installation cavity of the frame. The output gear has a central spline hole and external teeth. The external teeth of the output gear and the external teeth of the pin gear housing form a tooth meshing. An output gear support bearing is installed on each side of the outer ring of the output gear on its external teeth. The two output gear support bearings form a rotatable support fit with the inner cavity of the frame; the central spline hole of the output gear forms a power output interface.

2. The composite 10,000 Nm high-load compact precision reduction gear according to claim 1 is characterized by: A driving sleeve is fixed in each driving hole on the cycloid wheel, and contacts the eccentric outer circle of the crank shaft through the driving sleeve.

3. The composite 10,000 Nm high-load compact precision reduction gear according to claim 1 is characterized by: The bearings installed at the two ends of the crankshaft are symmetrically arranged tapered bearings, and the ends of the crankshaft are connected to the synchronous wheel drive by splines.

Images