Speed reducer vibration noise testing device and speed reducer thereof

Abstract

The invention discloses a reducer vibration noise test device and a reducer, the top end of a bottom plate is fixedly provided with a support frame, the top end of the support frame is provided with a driving test assembly, two groups of rotating wheel mechanisms and a fluctuation test mechanism are rotatably arranged on the support frame, and the two groups of rotating wheel mechanisms are oppositely arranged on the two sides of the fluctuation test mechanism. The transmission belt tightly surrounds the fluctuation testing mechanism and the two rotating wheel mechanisms and is attached to the bottoms of the wheels; the driven assembly is annularly and slidably arranged on the supporting frame, and the rotation of the rotating mechanism can drive the driven mechanism to slide; the fluctuation testing mechanism can expand outwards to jack up the transmission belt and extrude the wheels, and sliding of the driven assembly can drive the fluctuation testing mechanism to periodically and gradually expand and directly shrink. The vibration noise testing device for the speed reducer can spontaneously and periodically record the condition of noise generated by the speed reducer under different road conditions without adjusting the rotating direction of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and in particular, relates to a reducer vibration noise testing device and a reducer thereof. Background Art

[0002] In the process of automobile design and production, in order to ensure the long life of various components during the use of the automobile, various components need to be tested before production and assembly. In new energy vehicles, the test of reducer is essential, and the reducer vibration noise test is one of them. The use of the reducer can be judged by collecting and processing the size, timbre and frequency of the reducer vibration noise.

[0003] However, the existing new energy vehicle reducer vibration noise test device still has the following defects during use: 1. The existing reducer vibration and noise testing device only tests the single operation of the reducer, without testing the combined installation of shock absorbers and wheels, and without testing under the environment of vehicle load and different vehicle load weights, which makes the test results less convincing and unable to truly reflect the use of the reducer installed in new energy vehicles.

[0004] 2. During operation, the car will encounter bumpy roads. With the help of the suspension, the wheels will bounce, and the wheel drive shaft will tilt as the wheel moves. These will affect the vibration and noise generated when the drive shaft and the reducer interact. Therefore, the single operation test of the reducer not only has insufficient test results, but also cannot test the compatibility between the reducer and the suspension. It is impossible to select a more suitable reducer based on the test results. It can only simply test the quality of the reducer, which makes the test results limited.

[0005] To solve this problem, relevant technicians have designed a test device as shown in CN118583489A, in which a gradually sliding outward boss simulates an undulating road surface of different heights to measure relevant data. However, in this device, the boss is maintained at the maximum position after sliding outward, so that the subsequent measured data are all data at the position. However, in order to make the measurement result more accurate, it is necessary to repeat the measurement of different undulating heights many times. For this purpose, when the boss reaches the farthest position, it is necessary to control the motor to reverse so that the boss moves to the corresponding position to re-measure the data. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a reducer vibration noise testing device and a reducer thereof, so as to solve the technical problem mentioned in the above background technology that the motor needs to be controlled to reverse and re-measure the data.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: A speed reducer vibration and noise testing device comprises a bottom plate, a support frame, a driving test assembly, a sound receiver, a shock absorber, a wheel, a transmission shaft, a rotating wheel mechanism, a transmission belt, an ups and downs test mechanism and a driven assembly; The support frame is fixedly arranged at the top of the bottom plate, the driving test assembly is arranged at the top of the support frame, the shock absorber and the wheel are installed at the front side of the driving test assembly, a transmission shaft is arranged at the rear side of the wheel, the driving test assembly can rotate the transmission shaft, and the microphone is arranged on the driving test assembly; The rotating wheel mechanism and the ups and downs testing mechanism are rotatably arranged on the supporting frame respectively, the rotating wheel mechanism is provided with two groups and is relatively arranged on both sides of the ups and downs testing mechanism, the transmission belt tightly embraces the ups and downs testing mechanism and the two rotating wheel mechanisms, and the transmission belt is attached to the bottom of the wheel; The driven component can be annularly slidably arranged on the support frame, and the rotation of the rotating mechanism can drive the driven mechanism to slide; the ups and downs testing mechanism can expand outward to lift the transmission belt and squeeze the wheel, and the sliding of the driven component can drive the ups and downs testing mechanism to gradually expand and directly shrink periodically.

[0008] Furthermore, the ups and downs testing mechanism includes an ups and downs component, a screw assembly, a first torsion spring, a limiting component and an unlocking component; the ups and downs component, the limiting component and the unlocking component are respectively rotatably connected to the support frame, the screw assembly is coaxially arranged in the ups and downs component, the forward rotation of the screw assembly can make the ups and downs component expand outward, and the sliding of the driven assembly can drive the screw assembly to rotate forward; one end of the first torsion spring is connected to the screw assembly, and the other end is connected to the support frame, the limiting component can limit the reversal of the screw assembly, and the driven assembly can make the limiting component move away from the screw assembly through the unlocking assembly after sliding for multiple turns.

[0009] Furthermore, the undulating assembly includes a rotating tube and a protrusion; the rotating tube is rotatably connected to the support frame, a long hole is provided on the side of the rotating tube, the protrusion is slidably connected in the long hole, and the positive rotation of the screw assembly can drive the protrusion to slide outward.

[0010] Furthermore, the screw assembly includes a screw body, a ball nut, a tapered sleeve, a screw gear and a ratchet; the screw body is rotatably connected to the support frame, the ball nut is threaded on the ball screw, and the tapered sleeve is fixed on the ball nut near one end of the protrusion and can lift the protrusion; the screw gear and the ratchet are coaxially fixed on the screw body respectively, the sliding of the driven assembly can drive the screw gear to rotate forward, the limiting assembly can limit the reverse rotation of the ratchet, and the torsion spring is connected to the screw gear or the ratchet.

[0011] Furthermore, the limiting assembly includes a limiting shaft, a ratchet, a limiting gear and a second torsion spring; the limiting shaft is rotatably connected to the support frame, the ratchet is fixed on the limiting shaft and can limit the reverse rotation of the ratchet; the limiting gear is coaxially fixed on the limiting shaft and is connected to the support frame through the second torsion spring, and the rotation of the unlocking assembly can drive the limiting gear to rotate.

[0012] Furthermore, the unlocking assembly includes an unlocking shaft, an unlocking gear and an incomplete gear; the unlocking shaft is rotatably connected to the support frame, the unlocking gear and the incomplete gear are coaxially fixed on the unlocking shaft, and the sliding of the driven assembly can drive the unlocking gear to rotate, and the incomplete gear can engage with the limiting gear.

[0013] Furthermore, the wheel mechanism includes a wheel body, a wheel shaft, a wheel connecting rod, a driven tube and a driven block; the wheel body is rotatably connected to the support frame, one end of the shaft is coaxially fixed to the wheel body, and the other end is rotatably connected to the support frame; the rotating tube is rotatably connected to the support frame and is connected to the wheel shaft through the wheel connecting rod, and the driven block is provided with multiple blocks and is arranged on the outer wall of the driven tube, and the rotation of the driven block can drive the driven component to slide.

[0014] Furthermore, the driven assembly includes a driven connecting rod, a driven rack and a driven belt; an annular groove is provided on the support frame, the driven connecting rod is slidably connected in the annular groove and is connected to the driven rack, and the driven rack can respectively engage with the lead screw gear and the unlocking gear; the driven belt tightly embraces the driven blocks on both sides, and the driven rack is fixed on the driven belt.

[0015] A reducer, the above-mentioned reducer vibration noise testing device, the reducer is arranged between the wheel and the transmission shaft.

[0016] Compared with the prior art, the advancement of this application is: In the present application, the annular sliding of the driven component causes the undulation test mechanism to expand periodically. After the driven component slides a certain number of circles, the driven component causes the undulation test mechanism to shrink and expand again as the driven component slides, repeating the cycle over and over again. This allows the device to spontaneously and periodically record the noise emitted by the reducer under different road conditions without repeatedly adjusting the output direction of the motor, thereby measuring more data samples and more accurate results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is an overall schematic diagram of a speed reducer vibration noise testing device in the present invention; Figure 2 It is a cross-sectional schematic diagram of a speed reducer vibration noise testing device in the present invention; Figure 3 is a schematic diagram of the heave test mechanism of the present invention; Figure 4 is a schematic diagram of the rotating wheel mechanism of the present invention; Figure 5 is a schematic diagram of the driven mechanism; Figure 6 A schematic diagram of the support frame.

[0019] Reference numerals: Base plate 10, support frame 11, annular groove 111, drive test component 20, microphone 21, shock absorber 22, wheel 3, transmission shaft 31, wheel mechanism 4, wheel body 41, wheel shaft 42, wheel connecting rod 43, driven tube 44, driven block 45, transmission belt 5, ups and downs test mechanism 6, ups and downs component 61, rotating tube 611, protrusion 612, screw assembly 62, screw body 621, ball nut 622, tapered sleeve 623, screw gear 624, ratchet 625, first torsion spring 63, limiting component 64, limiting shaft 641, ratchet 642, limiting gear 643, second torsion spring 644, unlocking component 65, unlocking shaft 651, unlocking gear 652, incomplete gear 653, driven component 7, driven connecting rod 71, driven rack 72, driven belt 73, reducer 8. DETAILED DESCRIPTION

[0020] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0021] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, the present invention covers any substitution, modification, equivalent method and scheme made on the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present application, "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "an" and other similar words do not indicate a quantity limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0023] In the description of the present application, the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, when positional terms such as both sides, outside, up and down are used, it should be understood that they are only used to facilitate understanding and description, considering that the structure may be facing other positions.

[0024] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with general skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] The embodiment of the present invention is intended to introduce and illustrate the structural composition of a reducer vibration and noise testing device and the matching relationship between the various components. Unless otherwise specified, the dimensions, materials and manufacturing processes of the various components in the reducer vibration and noise testing device in the embodiment of the present invention can be selected according to the specific circumstances and are not specifically limited or explained herein.

[0026] Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. For those skilled in the art, the present invention can be fully understood without the description of these details.

[0027] Please also read Figure 1-Figure 6 The present embodiment provides a speed reducer vibration and noise testing device, including a base plate 10, a support frame 11, a driving test assembly 20, a sound receiver 21, a shock absorber 22, a wheel 3, a transmission shaft 31, a rotating wheel mechanism 4, a transmission belt 5, an ups and downs testing mechanism 6 and a driven assembly 7; The top of the bottom plate 10 is fixed with a support frame 11, and the top of the support frame 11 is provided with a driving test assembly 20, the front side of the driving test assembly 20 is installed with a shock absorber 22 and a wheel 3, and the rear side of the wheel 3 is provided with a transmission shaft 31, and the driving test assembly 20 can make the transmission shaft 31 rotate, and the microphone 21 is arranged on the driving test assembly 20; it should be understood that the test assembly drives the transmission shaft 31 to rotate, and the transmission shaft 31 drives the wheel 3 to rotate, and the reducer 8 is arranged between the wheel 3 and the transmission shaft 31, and the microphone 21 is used to receive and measure the size of the noise emitted by the reducer 8. The driving test assembly 20 in this application can refer to the structure shown in CN118583489A, and will not be repeated here.

[0028] The rotating wheel mechanism 4 and the ups and downs testing mechanism 6 are rotatably disposed on the support frame 11 respectively. The rotating wheel mechanism 4 is provided with two groups and is relatively disposed on both sides of the ups and downs testing mechanism 6. The transmission belt 5 tightly embraces the ups and downs testing mechanism 6 and the two rotating wheel mechanisms 4, and the transmission belt 5 is attached to the bottom of the wheel 3; specifically, the rotation of the wheel 3 drives the transmission belt 5 to rotate, and the rotation of the transmission belt 5 drives the ups and downs testing mechanism 6 and the two rotating wheel mechanisms 4 to rotate.

[0029] The driven assembly 7 can be annularly slidably arranged on the support frame 11, and the rotation of the rotating mechanism can drive the driven mechanism to slide; the ups and downs testing mechanism 6 can expand outward to lift the transmission belt 5 and squeeze the wheel 3, and the sliding of the driven assembly 7 can drive the ups and downs testing mechanism 6 to gradually expand and directly shrink periodically. It should be understood that the transmission belt 5 is made of highly elastic material and can remain elastically open when the ups and downs testing mechanism 6 lifts it up.

[0030] Specifically, during the circular sliding process of the driven component 7, the driven component 7 drives the undulation test mechanism 6 to expand outward by a certain size every time it passes a specific location, until the driven component 7 has circled a certain number of times, and then the undulation test mechanism 6 is directly reduced under the drive of the driven component 7, skipping the intermediate holding state, and expanding in the next cycle as the driven component 7 slides, and the cycle repeats, so that the test data can record periodic data.

[0031] In the present application, the annular sliding of the driven component 7 causes the undulation test mechanism 6 to expand periodically. After the driven component 7 slides a certain number of circles, the driven component 7 causes the undulation test mechanism 6 to shrink and expand again as the driven component 7 slides, and this cycle repeats over and over again. This allows the device to spontaneously and periodically record the noise emitted by the reducer 8 under different road conditions without repeatedly adjusting the output direction of the motor, so that more data samples are measured and the results are more accurate.

[0032] In other schemes, the ups and downs testing mechanism 6 includes an ups and downs assembly 61, a lead screw assembly 62, a first torsion spring 63, a limiting assembly 64 and an unlocking assembly 65; the ups and downs assembly 61, the limiting assembly 64 and the unlocking assembly 65 are respectively rotatably connected to the support frame 11, the lead screw assembly 62 is coaxially arranged in the ups and downs assembly 61, the forward rotation of the lead screw assembly 62 can make the ups and downs assembly 61 expand outward, and the sliding of the driven assembly 7 can drive the lead screw assembly 62 to rotate forward; one end of the first torsion spring 63 is connected to the lead screw assembly 62, and the other end is connected to the support frame 11. It should be understood that after the sliding of the driven assembly 7 drives the lead screw assembly 62 to rotate forward, the first torsion spring 63 gives the lead screw assembly 62 a tendency to reverse. The limiting assembly 64 can limit the reverse rotation of the lead screw assembly 62, and the driven assembly 7 can make the limiting assembly 64 away from the lead screw assembly 62 through the unlocking assembly 65 after sliding for multiple turns. After the limiting component 64 moves away from the screw assembly 62, the screw assembly 62 reverses under the drive of the first torsion spring 63, thereby shrinking the enlarged undulating component 61; after the driven component 7 moves the limiting component 64 away from the screw assembly 62 through the unlocking component 65, the driven component 7 continues to move and moves away from the unlocking component 65, and the unlocking component 65 is reset to re-limit the reversal of the screw assembly 62.

[0033] In other embodiments, the undulating assembly 61 includes a rotating tube 611 and a protrusion 612; the rotating tube 611 is rotatably connected to the support frame 11, and a long hole is provided on the side of the rotating tube 611, and the protrusion 612 is slidably connected in the long hole, and the positive rotation of the screw assembly 62 can drive the protrusion 612 to slide outward. It should be understood that the outer wall of the rotating tube 611 abuts against the inner side of the transmission belt 5, and the rotation of the transmission belt 5 can drive the rotation of the rotating tube 611.

[0034] In other schemes, the screw assembly 62 includes a screw body 621, a ball nut 622, a tapered sleeve 623, a screw gear 624 and a ratchet 625; the screw body 621 is rotatably connected to the support frame 11, the ball nut 622 is screwed to the ball screw, the tapered sleeve 623 is fixed on the ball nut 622 near the end of the protrusion 612, and can lift the protrusion 612; the screw gear 624 and the ratchet 625 are respectively coaxially fixed on the screw body 621, the sliding of the driven assembly 7 can drive the screw gear 624 to rotate forward, the limiting assembly 64 can limit the reverse rotation of the ratchet 625, and the torsion spring is connected to the screw gear 624 or the ratchet 625. It should be understood that the screw body 621 is located in the rotating tube 611 and is coaxial.

[0035] In other schemes, the limiting component 64 includes a limiting shaft 641, a pawl 642, a limiting gear 643 and a second torsion spring 644; the limiting shaft 641 is rotatably connected to the support frame 11, the pawl 642 is fixed on the limiting shaft 641, and can limit the reverse rotation of the ratchet 625; the limiting gear 643 is coaxially fixed on the limiting shaft 641, and is connected to the support frame 11 through the second torsion spring 644, and the rotation of the unlocking component 65 can drive the limiting gear 643 to rotate.

[0036] In other schemes, the unlocking component 65 includes an unlocking shaft 651, an unlocking gear 652 and an incomplete gear 653; the unlocking shaft 651 is rotatably connected to the support frame 11, and the unlocking gear 652 and the incomplete gear 653 are coaxially fixed on the unlocking shaft 651 respectively. The sliding of the driven component 7 can drive the unlocking gear 652 to rotate, and the incomplete gear 653 can engage with the limiting gear 643.

[0037] Specifically, after sliding for multiple turns, the driven assembly 7 drives the unlocking gear 652 to rotate, thereby causing the incomplete gear 653 and the limiting gear 643 to mesh from non-meshing and drives the limiting gear 643 to rotate, thereby causing the pawl 642 to move away from the ratchet 625. It should be understood that a single-turn sliding of the driven assembly 7 can cause the rotation between the incomplete gear 653 and the limiting gear 643 to go from non-meshing to meshing and then to non-meshing.

[0038] In other embodiments, the wheel mechanism 4 includes a wheel body 41, a wheel shaft 42, a wheel connecting rod 43, a driven tube 44 and a driven block 45; the wheel body 41 is rotatably connected to the support frame 11, one end of the shaft is coaxially fixed to the wheel body 41, and the other end is rotatably connected to the support frame 11; the rotating tube 611 is rotatably connected to the support frame 11, and is connected to the wheel shaft 42 through the wheel connecting rod 43, and the driven block 45 is provided with a plurality of and is provided on the outer wall of the driven tube 44, and the rotation of the driven block 45 can drive the driven assembly 7 to slide. Specifically, a groove matching the rotating tube 611 is provided on the support frame 11.

[0039] In other schemes, the driven assembly 7 includes a driven connecting rod 71, a driven rack 72 and a driven belt 73; an annular groove 111 is provided on the support frame 11, and the driven connecting rod 71 is slidably connected in the annular groove 111 and connected to the driven rack 72, and the driven rack 72 can be respectively engaged with the lead screw gear 624 and the unlocking gear 652; the driven belt 73 tightly embraces the driven blocks 45 on both sides, and the driven rack 72 is fixed on the driven belt 73. Specifically, the driven rack 72 is arranged on the inner side of the driven belt 73, and the driven belt 73 rotates with the rotation of the driven block 45, thereby driving the driven rack 72 to slide on the annular groove 111; a plurality of driven blocks 45 are provided on the side of the driven tube 44, and the driven rack 72 passes through the gaps between the driven blocks 45 when passing through the driven tube 44.

[0040] A reducer, the above-mentioned reducer vibration noise testing device, the reducer 8 can be arranged between the wheel 3 and the transmission shaft 31.

[0041] The above-mentioned speed reducer vibration noise testing device can spontaneously and periodically record the noise emitted by the speed reducer under different road conditions without adjusting the rotation direction of the motor.

[0042] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A reducer vibration noise testing device, characterized in that: It includes a base plate, a support frame, a driving test assembly, a radio receiver, a shock absorber, a wheel, a transmission shaft, a rotating wheel mechanism, a transmission belt, a heave test mechanism and a driven assembly; The support frame is fixedly arranged at the top of the bottom plate, the driving test assembly is arranged at the top of the support frame, the shock absorber and the wheel are installed at the front side of the driving test assembly, a transmission shaft is arranged at the rear side of the wheel, the driving test assembly can rotate the transmission shaft, and the microphone is arranged on the driving test assembly; The rotating wheel mechanism and the ups and downs testing mechanism are rotatably arranged on the supporting frame respectively, the rotating wheel mechanism is provided with two groups and is relatively arranged on both sides of the ups and downs testing mechanism, the transmission belt tightly embraces the ups and downs testing mechanism and the two rotating wheel mechanisms, and the transmission belt is attached to the bottom of the wheel; The driven assembly can be annularly slidably arranged on the support frame, and the rotation of the rotating mechanism can drive the driven mechanism to slide; the ups and downs testing mechanism can expand outward to lift the transmission belt and squeeze the wheel, and the sliding of the driven assembly can drive the ups and downs testing mechanism to gradually expand and directly shrink periodically; The ups and downs testing mechanism includes an ups and downs component, a screw component, a first torsion spring, a limiting component and an unlocking component; the ups and downs component, the limiting component and the unlocking component are respectively rotatably connected to the support frame, the screw component is coaxially arranged in the ups and downs component, the forward rotation of the screw component can make the ups and downs component expand outward, and the sliding of the driven component can drive the screw component to rotate forward; one end of the first torsion spring is connected to the screw component, and the other end is connected to the support frame, the limiting component can limit the reversal of the screw component, and the driven component can make the limiting component move away from the screw component through the unlocking component after sliding for multiple turns.

2. A reducer vibration noise testing device according to claim 1, characterized in that: The undulating assembly includes a rotating tube and a protrusion; the rotating tube is rotatably connected to the support frame, a long hole is provided on the side of the rotating tube, the protrusion is slidably connected in the long hole, and the positive rotation of the screw assembly can drive the protrusion to slide outward.

3. A reducer vibration noise testing device according to claim 2, characterized in that: The screw assembly includes a screw body, a ball nut, a tapered sleeve, a screw gear and a ratchet; the screw body is rotatably connected to the support frame, the ball nut is threaded on the ball screw, and the tapered sleeve is fixed on the ball nut near one end of the protrusion and can lift the protrusion; the screw gear and the ratchet are coaxially fixed on the screw body respectively, the sliding of the driven assembly can drive the screw gear to rotate forward, the limiting assembly can limit the reverse rotation of the ratchet, and the torsion spring is connected to the screw gear or the ratchet.

4. A reducer vibration noise testing device according to claim 3, characterized in that: The limiting assembly includes a limiting shaft, a ratchet, a limiting gear and a second torsion spring; the limiting shaft is rotatably connected to the support frame, the ratchet is fixed on the limiting shaft and can limit the reverse rotation of the ratchet; the limiting gear is coaxially fixed on the limiting shaft and is connected to the support frame through the second torsion spring, and the rotation of the unlocking assembly can drive the limiting gear to rotate.

5. A reducer vibration noise testing device according to claim 4, characterized in that: The unlocking assembly includes an unlocking shaft, an unlocking gear and an incomplete gear; the unlocking shaft is rotatably connected to the support frame, the unlocking gear and the incomplete gear are coaxially fixed on the unlocking shaft, and the sliding of the driven assembly can drive the unlocking gear to rotate, and the incomplete gear can engage with the limiting gear.

6. A reducer vibration noise testing device according to claim 5, characterized in that: The wheel mechanism includes a wheel body, a wheel shaft, a wheel connecting rod, a driven tube and a driven block; the wheel body is rotatably connected to the support frame, one end of the shaft is coaxially fixed to the wheel body, and the other end is rotatably connected to the support frame; the rotating tube is rotatably connected to the support frame and is connected to the wheel shaft through the wheel connecting rod, and the driven block is provided with a plurality of driven blocks and is arranged on the outer wall of the driven tube, and the rotation of the driven block can drive the driven component to slide.

7. A reducer vibration noise testing device according to claim 6, characterized in that: The driven assembly includes a driven connecting rod, a driven rack and a driven belt; an annular groove is provided on the support frame, the driven connecting rod is slidably connected in the annular groove and is connected to the driven rack, and the driven rack can be engaged with the lead screw gear and the unlocking gear respectively; the driven belt tightly embraces the driven blocks on both sides, and the driven rack is fixed on the driven belt.

8. A reducer, applied to a reducer vibration noise testing device according to any one of claims 1 to 7, characterized in that: The speed reducer can be arranged between the wheel and the transmission shaft.

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