Parallel shaft gearbox type speed reducer with high rotating speed and low noise

Abstract

The shaft end of an input shaft of the parallel shaft gearbox type speed reducer is connected with a motor shaft through a locking ring, the locking ring comprises a locking ring body and an installation body, the locking ring body comprises a deformation part and a base body part which are symmetrically distributed, the deformation part and the base body part are both of a semi-annular structure, and the installation body is connected with the deformation part. An adjustable locking hole is formed between the deformation part and the base body part, the deformation part and the near end of the base body part are integrated, an adjusting notch is formed in the far end, and screw holes are formed in the far ends of the deformation part and the base body part; two first balance holes are formed in the outer end face of the lock ring body in the axial direction, and the two first balance holes and the screw holes of the deformation part and the base body part form dynamic balance. According to the speed reducer, the locking ring is arranged at the end of the input shaft so as to achieve lossless hooping and quick disassembly and assembly of the motor shaft, friction is reduced, the total heating value is reduced, the grease leakage phenomenon of the sealing ring is reduced to a certain extent, the overall dynamic balance state of the locking ring can be kept through the balance hole formed in the locking ring, and the service life of the speed reducer is prolonged. And unbalanced vibration and noise in the transmission process are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, in particular to a parallel shaft gearbox type speed reducer with high speed and low noise. Background Art

[0002] When using a parallel shaft gearbox type reducer, if the input speed is too high, it will generate excessive noise accompanied by greater vibration; in addition, too high an input speed will also cause the reducer itself to heat up severely, causing the sealing ring to deform and fail, resulting in grease leakage.

[0003] Therefore, people have tried to improve the structure of the parallel shaft gearbox type reducer. Since the input end of the reducer is often in a high-speed operation condition, its structural design is one of the key designs to reduce noise and vibration. The existing technology is to directly make a single keyway structure at the input shaft end. Since the key connection requires a tight parts matching clearance, it is difficult to disassemble after the motor is installed. The single key connection will destroy the dynamic balance of the input end. As the speed increases, the vibration becomes greater and greater, and the noise generated will also become greater and greater. For the common spline structure input shaft, although this structure will reduce vibration and noise, it also has the problem of greater difficulty in disassembly and assembly, and has limited effect on the change of leaking grease. It is necessary to increase the contact area of ​​the sealing ring or increase the pressure to prevent grease leakage. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a parallel shaft gearbox type reducer with high speed and low noise to solve one or more problems raised in the above background technology.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A high-speed, low-noise parallel-axis gearbox type reducer, wherein an input gear shaft, an intermediate gear shaft and an output gear shaft are arranged in parallel inside a housing, the housing is composed of an inner housing and an outer housing which are relatively overlapped to form an internal installation space, the input gear shaft comprises a high-speed gear and an input shaft, the shaft end of the input shaft is connected to the motor shaft through a locking ring, and the outer housing is provided with a connecting hole which passes through the internal installation space thereof;

[0007] The locking ring includes an integrally formed locking ring body and a mounting body. The mounting body is installed in the connecting hole through a bearing. The bearing is a self-sealed bearing. The input shaft is interference-fitted and connected to the mounting hole set on the mounting body. The locking ring body includes a symmetrically distributed deformation part and a base part. The deformation part and the base part are both semi-annular structures. An adjustable locking hole is formed between the two. The motor shaft is inserted into the locking hole. The proximal ends of the deformation part and the base part are connected as a whole. The distal ends are cut to form an adjustment gap between the end faces. Screw holes are provided at the distal ends of the deformation part and the base part. The screw holes vertically pass through the adjustment gap. The locking screw is passed through the screw hole to connect the distal ends of the deformation part and the base part, and is used to apply a clamping force to elastically deform the deformation part and clamp the motor shaft with the base part. Two first balancing holes are axially arranged on the outer end face of the locking ring body. The two first balancing holes are respectively connected to the screw holes of the deformation part and the base part to form a dynamic balance with the locking center line of the locking hole as the rotation center.

[0008] Preferably, a stepped shaft for positioning the bearing is provided on one end of the mounting body close to the locking ring body, and a semi-annular end face on one side of the stepped shaft corresponding to the deformation part is formed into a step surface by milling, which together with the inner end face of the deformation part forms a semi-annular movable notch that passes through the locking hole, and is used to provide the deformation part with deformation freedom, and the width of the movable notch is smaller than the length of the stepped shaft.

[0009] More preferably, a deformation groove located at one end of the deformation portion and the base portion is provided on the outer end surface of the locking ring body along the edge of the locking hole.

[0010] Further preferably, a second balancing hole is provided on the outer end surface of the base portion for establishing a dynamic balance around the rotation center with the movable notch.

[0011] Further preferably, the locking ring is located in the step hole at the front end of the connecting hole, and at least one outer side surface of the outer box body is vertically opened with a mounting hole that passes through the step hole. When the screw hole is perpendicular to the outer side surface, the mounting hole and the screw hole are colinear.

[0012] Compared with the prior art, the high-speed and low-noise parallel shaft gearbox type reducer of the utility model is provided with a locking ring at the end of the input shaft to achieve lossless tightening and quick disassembly and assembly to connect the motor shaft. Compared with the flat key or spline installation, the tightening fit has less noise and abnormal sound, and the transmission area between the locking ring and the motor shaft circumference is large and the load capacity is large. Since there is no need to provide a keyway on the input shaft and the motor shaft, it is beneficial to improve the structural strength of both and facilitate higher speed design; at the same time, under the same rated speed and rated load, a smaller shaft diameter design can be adopted, and a locking ring structure is adopted to reduce the wall thickness design of the input shaft assembly hole, thereby correspondingly adopting a self-sealing bearing with a smaller outer diameter, and the built-in sealing ring of the self-sealing bearing is correspondingly smaller, thereby reducing the contact area of ​​the sealing circumference, reducing friction, reducing the total heat generation, and reducing the grease leakage of the sealing ring to a certain extent; in addition, a balancing hole for balancing the screw hole is provided on the locking ring to maintain the overall dynamic balance state of the locking ring, thereby reducing the unbalanced vibration and noise during the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional structural diagram of a reducer according to an example of the present utility model;

[0014] Figure 2 The cross-sectional structure diagram of the reducer of the utility model;

[0015] Figure 3 for Figure 2 The three-dimensional structure diagram of the middle locking ring;

[0016] Figure 4 for Figure 2 Front view of the middle locking ring.

[0017] In the figure: 1. inner box body; 2. outer box body; 21. connecting hole; 3. locking ring; 31. locking ring body; 31a. base part; 31b. deformation part; 311. adjustment gap; 312. first balance hole; 313. second balance hole; 314. screw hole; 315. deformation groove; 32. mounting body; 321. movable gap; 322. snap ring groove; 33. locking screw; 34. locking hole; 4. bearing; 5. input shaft; 6. intermediate shaft; 7. primary reduction gear; 8. secondary reduction gear; 9. output shaft; 10. low-speed gear; 11. mounting hole plug; 12. high-speed gear. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only the best embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1-Figure 4 As shown, a high speed and low noise parallel shaft gearbox type reducer, based on the parallel shaft gearbox type reducer of the prior art, again refer to Figure 2 The housing is a cover-shaped inner housing 1 and an outer housing 2 which are assembled together to form an internal installation space. An input gear shaft, an intermediate gear shaft and an output gear shaft are arranged in parallel inside the housing. The input gear shaft, the intermediate gear shaft and the output gear shaft are installed through rolling bearings at both ends. A primary reduction gear 7 and a secondary reduction gear 8 are arranged on the intermediate shaft 6. The primary reduction gear 7 is meshed with a high-speed gear 12 on the input shaft 5 to achieve a primary speed reduction. The secondary reduction gear 8 is meshed with a low-speed gear 10 on the output shaft 9 to achieve a secondary speed reduction. A connection hole 21 and an output hole are provided, which are used for the input shaft 5 to be connected to an external motor to input power, and for the output shaft 9 to be connected to an external actuator to output power. In order to facilitate lossless connection of the input shaft 5 and the motor shaft, a locking ring 3 is provided at the shaft end of the input shaft 5 for easy quick disassembly and assembly. The locking ring 3 uses the clamping principle to clamp the motor shaft for installation. Therefore, it is not necessary to remove material on the motor shaft and the input shaft 5 to form a keyway or a spline keyway. The input shaft 5 and the motor shaft can adopt a smaller shaft diameter size to meet the use strength requirements;

[0020] Reference Figure 3-Figure 4 The locking ring 3 is an integrated structure, which includes a locking ring body 31 and a mounting body 32. The mounting body 32 is used to support and connect the input shaft 5. It is installed in the connecting hole 21 through a bearing as a rotating support. An assembly hole is set through the mounting body 32. The shaft end of the input shaft 5 is interference-fitted into the assembly hole through a cold assembly process to form a hard connection that can be transmitted. Since the shaft diameter of the input shaft 5 can be reduced under the same torque transmission, the outer diameter of the mounting body 32 is also reduced accordingly, and the bearing 4 is adapted to the outer diameter of the mounting body 32. Therefore, a bearing 4 with a smaller inner diameter can be used to achieve relative rotation between the connecting hole 21 and the locking ring body 31. The bearing 4 is a self-sealing bearing, and its overall size is reduced, and the sealing area is correspondingly reduced. At high input speeds, because the contact area between the sealing ring in the bearing 4 and the bearing bush is reduced, the heat generation is correspondingly reduced, which reduces the grease leakage of the bearing 4 due to temperature increase and friction to a certain extent.

[0021] Refer again Figure 3-Figure 4The lock ring body 31 is used to connect the motor shaft, and includes a symmetrically distributed deformation part 31b and a base part 31a. The deformation part 31b can be deformed, and the base part 31a is an immovable part. The two together realize the clamping action. The deformation part 31b and the base part 31a are both semi-annular structures, and an adjustable locking hole 34 for inserting the motor shaft is formed between the two. The proximal ends of the deformation part 31b and the base part 31a are an integral structure, and the distal end is cut through the front and rear end surfaces of the lock ring body 31 to form an adjustment notch 311 along the axial direction and between the two distal end surfaces. Screw holes 314 are opened on the peripheral surfaces of the distal ends of the deformation part 31b and the base part 31a. The screw hole 314 is perpendicular to the adjustment notch 311 and connected in series with the adjustment notch 311. The locking screw 33 is threadedly connected to the two screw holes 314, connecting the distal ends of the deformation portion 31b and the base portion 31a, and applying a clamping force. By adjusting the deformation spacing of the adjustment notch 311, the deformation portion 31b is driven to elastically deform and clamp the motor shaft in the locking hole 34. When the clamping is completed, the distal end faces of the deformation portion 31b and the base portion 31a contact each other to complete the limited clamping, that is, the in-place clamping is achieved by completely absorbing the adjustment notch 311. At this time, the central axis of the motor shaft, the locking center line of the locking hole 34 and the central axis of the input shaft 5 should form a colinearity, that is, the rotation center line, so as to achieve rotational dynamic balance;

[0022] Since the screw hole 314 is provided on the lock ring body 31, it loses mass balance and dynamic balance around the rotation center. Dynamic balance is achieved by removing material on the other side of the rotation center line of the lock ring body 31, such as Figure 3 As shown, two first balancing holes 312 are axially arranged on the outer end surface of the locking ring body 31, and the depths of the two balancing holes are designed according to the two screw holes 314. When the clamping is completed, the two first balancing holes 312 should correspond to the screw holes 314 of the deformation part 31b and the base part 31a respectively, and construct a dynamic balance with the locking center line of the locking hole 34 as the rotation center.

[0023] In this embodiment, in order to position the bearing on the mounting body 32, a stepped shaft is provided at one end of the mounting body 32, and a snap ring groove 322 is provided on the circumferential surface of the other end of the mounting body 32 for installing a snap ring, and the snap ring and the end surface of the stepped shaft jointly position and clamp the bearing;

[0024] like Figure 4 As shown, in order to support the deformation of the deformation portion 31b and provide a sufficient deformation amount for clamping the motor shaft, a semi-annular end face corresponding to the deformation portion 31b on one side of the step shaft is milled to form an annular step face, and the annular step face and the inner end face of the deformation portion 31b are jointly constructed to form an active notch 321, and the active notch 321 passes through the locking hole 34, and the connection of the end face of the deformation portion 31b is removed to provide its deformation freedom; in order to ensure the supporting strength of the bearing 4, the width of the active notch 321 should be smaller than the length of the step shaft 4;

[0025] In order to balance the setting of the activity gap 321, such as Figure 3 As shown, a second balancing hole 313 is vertically arranged on the outer end surface of the base portion 31a. The position and hole depth of the second balancing hole 313 are set according to the movable notch 321, and are used to establish a dynamic balance around the rotation center with the movable notch 321. The distribution design can be carried out according to the dynamic balance calculation, and can also be set online through a dynamic balance test.

[0026] As a further technical solution, in order to further guide the deformation and reduce the difficulty of deformation, the outer edge of the locking hole 34 is beveled to form a deformation groove 315 located at one end of the deformation portion 31b and the base portion 31a, such as Figure 3 As shown, the rotation center of the deformation portion 31b is formed to rotate and deform.

[0027] In this embodiment, after the motor shaft is connected, the motor is assembled with the outer box body 2. In order to form a seamless assembly of the two, a step hole for setting the locking ring 3 is provided at the front end of the connecting hole 21. Therefore, after the motor shaft is inserted, there is no clamping operation space for the locking ring 3 between the motor and the outer box body 2. In order to solve the tightening operation problem, at least one outer side surface of the outer box body 2 is vertically provided with a mounting hole, and the mounting hole is connected to the mounting hole in the step hole. By rotating the input shaft 5, the screw hole 314 is rotated to a position perpendicular to the outer side surface and colinear with the mounting hole, so that the tool can be inserted into the mounting hole and the locking screw 33 can be tightened. After the installation is completed, the mounting hole is covered by the mounting hole plug 11.

[0028] The directional words such as "outside", "inside", "side", "end", "far", and "near" mentioned in this article are based on Figure 1-Figure 4 The orientation or position relationship shown in the relevant drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation; in addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance;

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the terms "on" and "inside" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-speed, low-noise parallel-axis gearbox type reducer, comprising an input gear shaft, an intermediate gear shaft and an output gear shaft arranged in parallel inside a housing, wherein the housing is composed of an inner housing and an outer housing which are relatively overlapped to form an internal installation space, wherein the input gear shaft comprises a high-speed gear and an input shaft, and wherein: The input shaft end is connected to the motor shaft via a locking ring, and the outer box body is provided with a connecting hole penetrating the internal installation space thereof; The locking ring includes an integrally formed locking ring body and a mounting body, the mounting body is mounted in the connecting hole through a bearing, the bearing is a self-sealed bearing, the input shaft is interference-fitted and connected to the mounting hole through the mounting body, the locking ring body includes a symmetrically distributed deformation portion and a base portion, the deformation portion and the base portion are both semi-annular structures, an adjustable locking hole is formed between the two, the motor shaft is inserted in the locking hole, the proximal ends of the deformation portion and the base portion are connected as a whole, and the distal end is formed by cutting to be located between the end faces An adjustment gap is provided, screw holes are provided at the distal ends of the deformation part and the base part, the screw holes vertically penetrate the adjustment gap, a locking screw is passed through the screw hole, connecting the deformation part and the distal ends of the base part, and is used to apply a clamping force to elastically deform the deformation part and clamp the motor shaft with the base part; two first balancing holes are axially arranged on the outer end surface of the locking ring body, and the two first balancing holes are respectively connected with the screw holes of the deformation part and the base part to form a dynamic balance with the locking center line of the locking hole as the rotation center.

2. The high-speed, low-noise parallel-axis gearbox type reducer according to claim 1, characterized in that: A stepped shaft for positioning the bearing is provided on one end of the mounting body close to the locking ring body, and a semi-annular end face on one side of the stepped shaft corresponding to the deformation portion is formed into a stepped surface by milling, which together with the inner end face of the deformation portion forms a semi-annular movable notch that passes through the locking hole, and is used to provide the deformation portion with deformation freedom, and the width of the movable notch is smaller than the length of the stepped shaft.

3. The high-speed, low-noise parallel-axis gearbox type reducer according to claim 2, characterized in that: A deformation groove located at the deformation portion and one end of the base portion is provided on the outer end surface of the lock ring body along the edge of the locking hole.

4. The high-speed, low-noise parallel-axis gearbox type reducer according to claim 3, characterized in that: A second balancing hole is arranged on the outer end surface of the base part, and is used to establish a dynamic balance around the rotation center with the movable notch.

5. The high-speed, low-noise parallel-axis gearbox type reducer according to claim 1, characterized in that: The locking ring is located in the step hole at the front end of the connecting hole, and at least one outer side surface of the outer box body is vertically provided with a mounting hole that passes through the step hole. When the screw hole is perpendicular to the outer side surface, the mounting hole and the screw hole are colinearly connected.

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