CN111649938A - Loading mechanism for RV reducer test bed - Google Patents
Loading mechanism for RV reducer test bed Download PDFInfo
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- CN111649938A CN111649938A CN202010656924.2A CN202010656924A CN111649938A CN 111649938 A CN111649938 A CN 111649938A CN 202010656924 A CN202010656924 A CN 202010656924A CN 111649938 A CN111649938 A CN 111649938A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
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Abstract
The invention discloses a loading mechanism for an RV reducer test bed, which comprises: a worm; the worm wheel is annular and is in rotary meshing with the worm; the central loading disc is arranged in the center of the worm wheel; and the torsion spring assembly is arranged between the inner periphery of the worm wheel and the outer periphery of the central loading disc, is connected with the worm wheel and the central loading disc and is used for transmitting loading torque. The loading mechanism for the RV reducer test bed provided by the invention can amplify and continuously load the torque output by the servo motor, improve the torque loading efficiency and avoid the stalling and heating of the servo motor.
Description
Technical Field
The invention relates to the technical field of speed reducer detection, in particular to a loading mechanism for an RV speed reducer test bed.
Background
The RV reducer consists of a front stage of a planetary gear reducer and a rear stage of a cycloidal pin gear reducer. The RV reducer has a compact structure, a large transmission ratio, and a transmission mechanism with a self-locking function under certain conditions, and is one of the most commonly used reducers. And the vibration is small, the noise is low, and the energy consumption is low.
At present, mechanisms such as 'movable pulley weight loading' and 'jack ball pair loading' are commonly adopted in RV reducer static performance test bench, and the current loading mode is all through artifical manual loading for the test bench operation is more troublesome, and efficiency of software testing is low, still has great difference from big batch, polytypic RV reducer test expectation demand.
In addition, there are two main technical problems in the scheme that RV reduction gear static performance test bench adopts direct control servo motor to carry out the loading to RV reduction gear output: firstly, the rated output torque of a servo motor in the market is small, and the direct drive cannot meet the test requirements of high torque and high rotating speed static performance of a series RV reducer; secondly, when carrying out the batched test to the RV reduction gear, servo motor stall operation for a long time will make servo motor operating current reach the maximum value to produce a series of problems such as motor overheat or impaired, this will seriously influence servo motor's life and the working property of whole test bench, simultaneously, frequently change servo motor, the use of test bench and maintenance cost also will increase, lead to the efficiency of software testing low moreover.
Therefore, how to realize the automatic loading of the RV reducer and improve the efficiency of testing the static performance of the RV reducer becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a loading mechanism for an RV reducer test bed, which can amplify the torque of a servo motor and automatically and continuously load the torque, improve the torque loading efficiency and avoid the stalling and heating of the servo motor.
In order to achieve the above object, the present invention provides a loading mechanism for an RV reducer test bed, comprising:
a worm;
the worm wheel is annular and is in rotary meshing with the worm;
the central loading disc is arranged in the center of the worm wheel;
and the torsion spring assembly is arranged between the inner periphery of the worm wheel and the outer periphery of the central loading disc, is connected with the worm wheel and the central loading disc and is used for transmitting loading torque.
Optionally, the inner periphery of the worm wheel is coaxially and fixedly connected with a sleeve, and the torsion spring assembly is connected with the sleeve and the central loading disc.
Optionally, the sleeve is interference fitted with the worm gear.
Optionally, the torsion spring assemblies are arranged in multiple groups, and any one group of the torsion spring assemblies comprises a pair of a forward loading torsion spring and a reverse loading torsion spring with opposite torsion directions.
Optionally, the multiple groups of torsion spring assemblies are uniformly arranged along the circumferential direction of the sleeve and the central loading disc, and included angles between the forward loading torsion springs and the reverse loading torsion springs of all the torsion spring assemblies are equal.
Optionally, the forward-loading torsion spring and the reverse-loading torsion spring each comprise:
the middle torsion part, a lower end straight arm arranged at the bottom end of the middle torsion part and an upper end torsion arm arranged at the top end of the middle torsion part;
the central loading disc is provided with first plug holes matched with the upper end torsion arms one by one, and the sleeve is provided with second plug holes matched with the lower end straight arms one by one.
Optionally, the upper torsion arm extends along the axial direction of the middle torsion part, and the first insertion hole penetrates through the central loading disc;
the lower end straight arm extends along the tangential direction on the circumference of the middle torsion part, and the second inserting hole is formed in the inner wall of the sleeve.
Optionally, the first insertion hole or the second insertion hole is a long round hole.
Optionally, the center of the central loading disc is provided with a loading hole for connecting the input shaft of the speed reducer.
Compared with the background technology, the loading mechanism for the RV reducer test bed is connected with the output shaft of the servo motor by the worm, and performs speed reduction output and torque amplification by matching the worm and the worm wheel; the center of the annular worm wheel is provided with a central loading disc, the periphery of the central loading disc and the inner periphery of the worm wheel are provided with torsion spring assemblies, when the output power/torque of the servo motor is increased, the deformation increase of the torsion spring assemblies is matched with the output torque of the servo motor, the torsion spring assemblies are used for loading the torque and transmitting the torque to the central loading disc, and the central loading disc is connected with the speed reducer to realize the input of the loading torque during the static performance test of the speed reducer.
By controlling the four-quadrant operating characteristic of the servo motor, forward loading, forward unloading, reverse loading and reverse unloading are carried out, the purpose of forward and reverse rotation continuous automatic loading is achieved, the loading test efficiency is improved, and meanwhile, the servo motor is prevented from being locked and generating heat; the speed reduction and torque increase are realized by means of the worm wheel and the worm, and the requirement of a large torque test range during test of test bed series products is met.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a block diagram of a loading mechanism for an RV reducer test bed according to one embodiment of the invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of the sleeve of FIG. 1;
FIG. 4 is a schematic view of the center loading tray of FIG. 1;
fig. 5 is a block diagram of a set of torsion spring assemblies of fig. 1.
Wherein:
1-worm, 2-worm wheel, 3-sleeve, 31-second plug hole, 4-torsion spring component, 41-upper end torsion arm, 42-middle torsion part, 43-lower end straight arm, 5-central loading disc, 51-first plug hole and 52-loading hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, fig. 1 is a structural diagram of a loading mechanism for an RV reducer test stand according to an embodiment of the present invention, fig. 2 is a side view of fig. 1, fig. 3 is a schematic diagram of a sleeve in fig. 1, fig. 4 is a schematic diagram of a center loading disc in fig. 1, and fig. 5 is a structural diagram of a torsion spring assembly in fig. 1.
The loading mechanism for the RV reducer test bed comprises a worm 1, an annular worm wheel 2, a central loading disc 5 arranged in the center of the annular worm wheel 2, and a torsion spring assembly 4 which is used for connecting the worm wheel 2 with the central loading disc 5 and continuously transmitting torque to the central loading disc 5. When the static characteristic test is carried out on the speed reducer, the worm 1 is connected with the servo motor, and the worm wheel 2 and the worm 1 are matched to play roles in reducing the speed and amplifying the torque, so that the defect of insufficient torque of the servo motor is overcome; the torsion spring assembly 4 which is arranged between the outer periphery of the central loading disc 5 and the inner periphery of the worm wheel 2 and used for connecting the central loading disc 5 and the worm wheel 2 is used for realizing continuous loading, the central loading disc 5 is connected with an input shaft of the speed reducer, torque is input into the speed reducer through the arrangement of the central loading disc 5, continuous loading of the static performance test of the speed reducer is completed, and the test efficiency is improved.
The loading mechanism for the RV reducer test bed provided by the invention is described in more detail below with reference to the accompanying drawings and specific embodiments.
In an alternative embodiment provided by the invention, the arrangement of the loading mechanism for the RV reducer test bed can refer to fig. 1 and fig. 2, the speed reduction and torque increase are realized through the worm wheel 2 and the worm 1 assembly, and when the output power of the servo motor, namely the output power of the worm 1, is a fixed value, the speed reduction and torque increase of the worm wheel 2 are realized through the worm wheel 2. The worm wheel 2 is in a hollow ring shape, the periphery of the worm wheel is provided with teeth meshed with the worm 1 in a spiral mode, the center of the worm wheel 2 is provided with a central loading disc 5, and the central loading disc 5 is connected with the worm wheel 2 through a torsion spring assembly 4, so that the torsion is transmitted to the central loading disc 5 through the torsion spring assembly 4 when the worm wheel 2 rotates, and finally the torsion is transmitted to the speed reducer to be detected.
The torsion spring assembly 4 has the function of connecting the central loading disc 5 and the worm wheel 2, and can continuously load and transmit torque to the central loading disc 5, when the output torque of the servo motor changes, the deformation of the torsion spring assembly 4 changes along with the change of the output torque, and the torque transmitted by loading changes continuously. Two ends of the torsion spring assembly 4 are respectively connected with the worm wheel 2 and the central loading disc 5, and the torsion spring assembly 4 is installed to meet the loading requirements of forward loading and reverse loading of the central loading disc 5.
In a further embodiment provided by the invention, the loading mechanism for the RV reducer test bed further comprises a sleeve 3, and the sleeve 3 is arranged on the inner periphery of the worm wheel 2 and is fixedly connected with the worm wheel 2. The fastening here means that the worm wheel 2 and the sleeve 3 do not rotate relative to each other in the circumferential direction. The sleeve 3 is fixedly connected with the annular worm wheel 2 in various modes, one mode is that the sleeve 3 and the worm wheel 2 are embedded in an interference mode, and the other mode is that the sleeve 3 and the worm wheel 2 are fixed in a welding mode.
Sleeve 3 realizes rotating with worm wheel 2's synchronization through the rigid coupling with worm wheel 2, and when concrete installation, the one end of torsional spring subassembly 4 is connected on sleeve 3, and the other end is then connected on central loading dish 5, follows worm wheel 2 through sleeve 3 and rotates in step, twists reverse torsional spring subassembly 4 for torsional spring subassembly 4 takes place continuous deformation, realizes the automatic loading of moment of torsion, with the help of torsional spring subassembly 4 deformation to central loading dish 5 output torque. The central loading disc 5 outputs the torque to an input shaft of the speed reducer to continuously load the speed reducer.
To optimize the above embodiment, the present invention provides torsion spring assemblies 4 arranged in multiple sets along the outer periphery of the central loading disc 5 and the inner periphery of the sleeve 3. Wherein each set of torsion spring assemblies 4 comprises a pair of forward-loading torsion springs (left in fig. 5) and a reverse-loading torsion springs (right in fig. 5) with opposite torsion directions. The opposite torsion directions mainly mean that the spiral directions of the pair of torsion springs are opposite, so that different torsion springs act when the servo motor drives the sleeve 3 to rotate through the worm wheel 2 and the worm 1, and the torsion torque opposite to the rotation direction of the sleeve 3 is loaded.
As shown in fig. 5, each of the forward-loading torsion spring and the reverse-loading torsion spring includes a middle torsion portion 42, an upper end torsion arm 41 at an upper end of the middle torsion portion 42, and a lower end straight arm 43 at a lower end of the middle torsion portion 42. Wherein the upper torsion arms 41 are adapted to engage the central loading disc 5 and the lower straight arms 43 are adapted to engage the sleeve 3.
Referring to fig. 3 and 4, the central loading plate 5 is provided with a first insertion hole 51 having a certain depth along the thickness direction, the upper torsion arm 41 extends along the axial direction of the middle torsion portion 42, the forward loading torsion spring and the reverse loading torsion spring are disposed in parallel with the axial direction of the central loading plate 5, and the upper torsion arm 41 is inserted into the first insertion hole 51 to connect with the central loading plate 5. The number of the groups of the first inserting holes 51 is equal to that of the torsion spring assemblies 4, two first inserting holes 51 are provided in each group, and are respectively matched and inserted with the upper end torsion arms 41 of the forward loading torsion springs and the reverse loading torsion springs, and the included angle between the axis of the two first inserting holes 51 of each group of the first inserting holes 51 and the axis connecting line of the central loading disc 5 is equal, that is, the distance between the two first inserting holes 51 in the groups of the first inserting holes 51 is equal.
The inner wall of the sleeve 3 is uniformly provided with second inserting holes 31 along the circumferential direction, the number of the groups of the second inserting holes 31 is equal to that of the torsion spring assemblies 4, and each group of the second inserting holes 31 comprises a pair of second inserting holes 31 which are respectively and correspondingly connected with the lower end straight arms 43 of the forward loading torsion spring and the reverse loading torsion spring.
In order to realize that the forward loading torsion spring and the reverse loading torsion spring of the group of torsion spring assemblies 4 respectively act to generate torque when the sleeve 3 rotates in different directions, one of the first inserting hole 51 and the second inserting hole 31 is a long round hole. When the first inserting hole 51 is a long circular hole, the long circular hole is an arc-shaped hole extending along the circumferential direction of the central loading disc 5 in the length direction, and the second inserting hole 31 is a circular hole for fixing the lower end straight arm 43; when the second inserting hole 31 is an elongated circular hole, the elongated circular hole is an arc-shaped hole extending along the circumferential direction of the sleeve 3 in the length direction, and the first inserting hole 51 is a circular hole for fixing the upper end torsion arm 41.
The forward and reverse loading and unloading of the central loading plate 5 will be described with the second inserting hole 31 as an oblong hole.
In the initial state, the lower straight arm 43 of the forward loading torsion spring is disposed at the leftmost end of the corresponding second inserting hole 31, and the straight arm of the reverse loading torsion spring is disposed at the rightmost end of the corresponding second inserting hole 31. When the device works, the forward/reverse loading torsion spring can freely slide along the annular groove in the right/left direction under the action of torque transmitted by the sleeve 3.
When the servo motor is powered on, the worm wheel 2 and the worm 1 are loaded with constant rotating speed and variable torque by adopting a torque control mode of the servo motor, the input torque is transmitted to the worm wheel 2 from the worm 1, the sleeve 3 is in interference fit connection with the worm wheel 2, the worm wheel 2 rotates to drive the sleeve 3 to follow up, so that the torsion spring assembly 4 is driven to rotate by a certain angle to generate torque, and then the torsion spring assembly 4 transmits the torque to the central loading disc 5, so that the output of the loading torque is realized.
Further, the working principle of realizing four stages of forward and reverse continuous loading in the relative motion process of loading of one torsion spring assembly 4 is explained:
a) in the forward loading stage, the worm wheel 2 drives the sleeve 3 to rotate clockwise, so as to drive four forward loading torsion springs of four groups of torsion spring assemblies 4 shown in the figure to rotate clockwise, the forward loading torsion spring subjected to torsional moment applies torque to the central loading disc 5, the torque is gradually increased from zero to the maximum torque (rated output torque) required by the static test of the test bed, the four reverse loading torsion springs of the torsion spring assemblies 4 do not enter a reverse loading working area due to the clockwise rotation of the sleeve 3, so that no torque is transmitted, the four reverse loading torsion springs move in the long round hole-shaped second plug holes 31 formed in the sleeve 3, and the reverse loading torsion springs are prevented from deforming and generating torque.
b) And in the forward unloading stage, the worm wheel 2 drives the sleeve 3 to rotate anticlockwise, the forward loading torsion spring is gradually unloaded to an initial state, namely an unloaded state, along with the anticlockwise rotation of the sleeve 3, and the reverse loading torsion spring moves back to the initial position from the other end of the long round hole formed in the sleeve 3.
c) In the reverse loading stage, the worm wheel 2 drives the sleeve 3 to rotate anticlockwise so as to drive the reverse loading torsion spring to rotate anticlockwise, similarly, the reverse loading torsion spring subjected to the torsion moment applies the torsion moment to the central loading disc 5, the torsion moment is gradually increased from zero to the maximum torque required by the test bed (the direction is opposite to the front direction), the reverse loading torsion spring is similar to the previous description, the forward loading torsion spring does not enter a forward loading working area due to the anticlockwise rotation of the sleeve 3, so that any moment is not transmitted, and the long round hole-shaped second plug hole 31 arranged on the sleeve 3 moves, so that the forward loading torsion spring cannot deform and generate the torque.
d) And in the reverse unloading stage, the worm wheel 2 drives the sleeve 3 to rotate anticlockwise, the forward loading torsion spring is gradually unloaded to an initial state, namely an unloaded state, along with the anticlockwise rotation of the sleeve 3, and the reverse loading torsion spring moves back to the initial position from the other end of the long round hole formed in the sleeve 3.
Therefore, the work condition explanation of a complete forward and reverse loading process in the whole static performance test is completed, forward and reverse continuous automatic loading during the RV reducer static test can be realized only by strictly controlling the four-quadrant motion characteristic of the servo motor, and meanwhile, the servo motor is prevented from generating heat due to rotation blockage in the loading process, the service life of the servo motor is prolonged, and the experiment cost is reduced.
Obviously, in the above embodiment, it is possible to configure not only the second insertion hole 31 of the sleeve 3 as an oblong hole, but also the first insertion hole 51 of the central loading plate 5 as a circular hole; the second inserting hole 31 of the sleeve 3 can be set as a circular hole and the first inserting hole 51 of the central loading disc 5 can be set as an oblong hole as required, and the four loading processes are similar to the above-described embodiment.
Furthermore, a loading hole 52 is formed in the center of the central loading disc 5, the central loading hole 52 is connected with an input shaft of the reducer, when static performance testing is performed, only the servo motor is connected with the worm 1, the input shaft of the RV reducer to be detected is connected with the loading hole 52 of the central loading disc 5, four-quadrant motion of the servo motor is controlled, continuous automatic loading during the RV reducer static performance testing can be achieved, testing efficiency is remarkably improved, and meanwhile, the worm wheel 2 and the worm 1 are matched to achieve speed reduction and torque amplification effects, so that torque input requirements during the RV reducer torque static performance testing are met.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The loading mechanism for the RV reducer test bed provided by the invention is described in detail above. 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. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a RV reduction gear loading mechanism for test bench which characterized in that includes:
a worm (1);
the worm wheel (2) is annular and is in rotary meshing with the worm (1);
the central loading disc (5) is arranged in the center of the worm wheel (2);
and the torsion spring assembly (4) is arranged between the inner periphery of the worm wheel (2) and the outer periphery of the central loading disc (5), is connected with the worm wheel (2) and the central loading disc (5) and is used for transmitting loading torque.
2. The loading mechanism for the RV reducer test bed as claimed in claim 1, characterized in that the inner circumference of the worm gear (2) is coaxially fixedly connected with a sleeve (3), and the torsion spring assembly (4) is connected with the sleeve (3) and the central loading disc (5).
3. The loading mechanism for the RV reducer test stand according to claim 2, characterized in that the sleeve (3) is embedded in the worm wheel (2) in an interference manner.
4. The loading mechanism for the RV reducer test bed as claimed in claim 2 or 3, characterized in that said torsion spring assemblies (4) are arranged in multiple groups, and any group of said torsion spring assemblies (4) comprises a pair of forward loading torsion spring and reverse loading torsion spring with opposite torsion directions.
5. The loading mechanism for the RV reducer test bed according to claim 4, characterized in that a plurality of groups of said torsion spring assemblies (4) are uniformly arranged along the circumference of said sleeve (3) and said central loading disc (5), and the included angles between said forward loading torsion springs and said reverse loading torsion springs of all said torsion spring assemblies (4) are equal.
6. The loading mechanism for the RV reducer test stand of claim 4, wherein said forward loading torsion spring and said reverse loading torsion spring each comprise:
a middle torsion part (42), a lower end straight arm (43) arranged at the bottom end of the middle torsion part (42), and an upper end torsion arm (41) arranged at the top end of the middle torsion part (42);
the central loading disc (5) is provided with first plug holes (51) which are matched with the upper end torsion arms (41) one by one, and the sleeve (3) is provided with second plug holes (31) which are matched with the lower end straight arms (43) one by one.
7. The loading mechanism for the RV reducer test bed as claimed in claim 6, characterized in that said upper end torsion arm (41) extends along the axial direction of said middle torsion portion (42), said first plug hole (51) is opened through said central loading disc (5);
the lower end straight arm (43) extends along the tangential direction on the circumference of the middle torsion part (42), and the second inserting hole (31) is formed in the inner wall of the sleeve (3).
8. The loading mechanism for the RV reducer test bed according to claim 6, characterized in that the first plug-in hole (51) or the second plug-in hole (31) is a slotted hole.
9. The loading mechanism for the RV reducer test bed as claimed in claim 8, characterized in that the center of the central loading disk (5) is provided with a loading hole (52) for connecting the input shaft of the reducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010656924.2A CN111649938A (en) | 2020-07-09 | 2020-07-09 | Loading mechanism for RV reducer test bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010656924.2A CN111649938A (en) | 2020-07-09 | 2020-07-09 | Loading mechanism for RV reducer test bed |
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| CN111649938A true CN111649938A (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010656924.2A Pending CN111649938A (en) | 2020-07-09 | 2020-07-09 | Loading mechanism for RV reducer test bed |
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Cited By (1)
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| CN113820125A (en) * | 2021-10-13 | 2021-12-21 | 中国航发沈阳发动机研究所 | Torque loading device for test of star-shaped transmission gear box |
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