A speed reducer vibration noise testing device and speed reducer thereof

Abstract

The present invention discloses a reducer vibration and noise testing device and a reducer. A support frame is fixedly provided on the top of the base plate, and a driving test assembly is provided on the top of the support frame. A rotary wheel mechanism and an ups and downs test mechanism are rotatably provided on the support frame respectively. The rotary wheel mechanism is provided in two groups and is relatively provided on both sides of the ups and downs test mechanism. The transmission belt tightly embraces the ups and downs test mechanism and the two rotary wheel mechanisms, and the transmission belt and the bottom of the wheel are attached to each other. The driven assembly can be annularly slidably provided on the support frame, and the rotation of the rotary wheel mechanism can drive the driven assembly to slide. The ups and downs test 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 test mechanism to gradually expand and directly shrink periodically. The above-mentioned reducer vibration and noise testing device can spontaneously and periodically record the noise emitted by the reducer under different road conditions without adjusting the rotation 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] During the automobile design and production process, 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 the reducer is essential, and the reducer vibration and noise test is one of them. By collecting and processing the size, timbre and frequency of the reducer vibration and noise, the use of the reducer can be judged.

[0003] However, the existing new energy vehicle reducer vibration noise test device still has the following defects during use:

[0004] 1. The existing speed reducer vibration and noise testing device only tests the single operation of the speed reducer, without combining the installation of shock absorbers and wheels for testing. At the same time, it does not test under the load vehicle weight and different vehicle load weight environments. As a result, the test results are not convincing enough and cannot truly reflect the use of the speed reducer installed in new energy vehicles.

[0005] 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, a single operation test of the reducer not only has insufficient test results, but also cannot test the compatibility between the reducer and the suspension. Therefore, 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.

[0006] To address this issue, relevant technicians have designed a testing device, such as the one shown in CN118583489A. This device uses a gradually sliding outward projection to simulate undulating road surfaces of varying heights, thereby measuring relevant data. However, in this device, the projection remains in position after sliding to its maximum position, resulting in subsequent measurements being based on the current position. However, to ensure more accurate measurement results, repeated measurements of varying undulation heights are required. To this end, when the projection reaches its maximum position, the motor must be reversed to move the projection to the corresponding position and remeasure the data. Summary of the Invention

[0007] In view of the deficiencies of 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 requires controlling the motor to reverse and re-measure the data.

[0008] To achieve the aforementioned object of the invention, the technical solutions adopted by the present invention include:

[0009] A speed reducer vibration and noise testing device comprises a base plate, a support frame, a drive test assembly, a sound receiver, a shock absorber, a wheel, a transmission shaft, a rotating wheel mechanism, a transmission belt, an undulation test mechanism and a driven assembly;

[0010] The support frame is fixedly provided at the top of the base plate, the driving test assembly is provided at the top of the support frame, the shock absorber and the wheel are installed on the front side of the driving test assembly, a transmission shaft is provided on the rear side of the wheel, the driving test assembly can rotate the transmission shaft, and the microphone is provided on the driving test assembly;

[0011] The rotating wheel mechanism and the ups and downs testing mechanism are rotatably mounted on the support frame respectively. The rotating wheel mechanism is provided in two groups and is oppositely mounted on both sides of the ups and downs testing mechanism. The transmission belt tightly surrounds the ups and downs testing mechanism and the two rotating wheel mechanisms, and the transmission belt is attached to the bottom of the wheel.

[0012] The driven component can be annularly slidably arranged on the support frame, and the rotation of the rotating wheel mechanism can drive the driven component to slide; the undulation testing mechanism can expand outward to lift the transmission belt and squeeze the wheel, and the sliding of the driven component can drive the undulation testing mechanism to gradually expand and directly shrink periodically.

[0013] Furthermore, the ups and downs testing mechanism includes an ups and downs assembly, a screw assembly, a first torsion spring, a limiting assembly and an unlocking assembly; the ups and downs assembly, the limiting assembly and the unlocking assembly are respectively rotatably connected to the support frame, the screw assembly is coaxially arranged in the ups and downs assembly, the forward rotation of the screw assembly can make the ups and downs assembly 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 assembly can limit the reversal of the screw assembly, and the driven assembly can move the limiting assembly away from the screw assembly through the unlocking assembly after sliding multiple turns.

[0014] Furthermore, the undulating assembly includes a rotating tube and a protrusion; the rotating tube is rotatably connected to the support frame, and a long hole is provided on the side of the rotating tube, and the protrusion is slidably connected to the long hole. The positive rotation of the screw assembly can drive the protrusion to slide outward.

[0015] 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 screw body, 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 respectively coaxially fixed on the screw body, 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.

[0016] Furthermore, the limiting assembly includes a limiting shaft, a pawl, a limiting gear and a second torsion spring; the limiting shaft is rotatably connected to the support frame, the pawl is fixed on the limiting shaft, and can limit the reversal 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.

[0017] 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.

[0018] 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 wheel 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.

[0019] 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 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.

[0020] A reducer, the above-mentioned reducer vibration noise testing device, the reducer is arranged between the wheel and the transmission shaft.

[0021] Compared with the prior art, the advancements of this application are:

[0022] 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. This enables 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, resulting in more measured data samples and more accurate results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is an overall schematic diagram of a speed reducer vibration noise testing device in the present invention;

[0025] Figure 2 Schematic cross-section of a speed reducer vibration and noise testing device according to the present invention;

[0026] Figure 3 Schematic diagram of the undulation test mechanism of the present invention;

[0027] Figure 4 is a schematic diagram of the rotary wheel mechanism of the present invention;

[0028] Figure 5 is a schematic diagram of a driven component;

[0029] Figure 6 A schematic diagram of the support frame.

[0030] Reference numerals:

[0031] Base plate 10, support frame 11, annular groove 111, drive test assembly 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 testing mechanism 6, ups and downs assembly 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 assembly 64, limiting shaft 641, pawl 642, limiting gear 643, second torsion spring 644, unlocking assembly 65, unlocking shaft 651, unlocking gear 652, incomplete gear 653, driven assembly 7, driven connecting rod 71, driven rack 72, driven belt 73, reducer 8. DETAILED DESCRIPTION

[0032] In view of the deficiencies in the prior art, the inventors of this case have 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 principles, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0033] 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 should not be understood as limiting the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, the present invention covers any substitution, modification, equivalent method and scheme made within the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In the description of this application, "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "a" or "an" and other similar words do not indicate a quantity limitation, but rather indicate the existence of at least one. "Include" or "comprising" and other similar words mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0035] In the description of this application, the terms "center," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Furthermore, when positional terms such as "both sides," "outside," "upper," and "lower" are used, they should be understood to be used solely to facilitate understanding and description, taking into account that the structure may be oriented in other directions.

[0036] 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 ordinary 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.

[0037] The embodiments of the present invention are intended to introduce and illustrate the structural composition of a reducer vibration and noise testing device and the coordination relationship between the various components. Unless otherwise specified, the dimensions, materials, and manufacturing processes of the various components suitable for the reducer vibration and noise testing device in the embodiments of the present invention can be selected according to specific circumstances and are not specifically limited or explained here.

[0038] Furthermore, in order to provide the public with a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0039] Please also refer to Figures 1-6 This 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 microphone 21, a shock absorber 22, a wheel 3, a transmission shaft 31, a rotating wheel mechanism 4, a transmission belt 5, an undulation test mechanism 6, and a driven assembly 7;

[0040] A support frame 11 is fixed to the top of the base plate 10, and a drive test assembly 20 is installed on the top of the support frame 11. A shock absorber 22 and a wheel 3 are installed on the front side of the drive test assembly 20, and a drive shaft 31 is installed on the rear side of the wheel 3. The drive test assembly 20 can rotate the drive shaft 31, and a microphone 21 is provided on the drive test assembly 20. It should be understood that the test assembly drives the drive shaft 31 to rotate, and the drive shaft 31 drives the wheel 3 to rotate. The reducer 8 is provided between the wheel 3 and the drive shaft 31. The microphone 21 is used to receive and measure the noise level emitted by the reducer 8. The drive test assembly 20 in this application can refer to the structure shown in CN118583489A, and will not be repeated here.

[0041] The rotating wheel mechanism 4 and the ups and downs testing mechanism 6 are respectively rotatably provided on the support frame 11. There are two groups of rotating wheel mechanisms 4 and they are relatively arranged 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. 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.

[0042] The driven assembly 7 is annularly slidably mounted on the support frame 11. The rotation of the rotating wheel mechanism drives the driven assembly to slide. The undulation test mechanism 6 expands outward, lifting the transmission belt 5 and squeezing the wheel 3. The sliding of the driven assembly 7 causes the undulation test mechanism 6 to periodically expand and contract. It should be understood that the transmission belt 5 is made of a highly elastic material and can remain elastically stretched when the undulation test mechanism 6 lifts it.

[0043] Specifically, during the circular sliding of the driven component 7, each time the driven component 7 passes a specific location, it drives the undulation test mechanism 6 to expand outward by a certain size. After the driven component 7 has circled a certain number of times, the undulation test mechanism 6 is directly reduced under the drive of the driven component 7, skipping the intermediate holding state, and then expands for the next cycle as the driven component 7 slides, repeating the cycle. This allows the test data to be recorded periodically.

[0044] 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, repeating the cycle. This enables 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.

[0045] In other embodiments, the undulation test mechanism 6 includes an undulation assembly 61, a screw assembly 62, a first torsion spring 63, a limiting assembly 64, and an unlocking assembly 65. The undulation assembly 61, the limiting assembly 64, and the unlocking assembly 65 are each rotatably connected to the support frame 11. The screw assembly 62 is coaxially disposed within the undulation assembly 61. The forward rotation of the screw assembly 62 can cause the undulation assembly 61 to expand outward, and the sliding of the driven assembly 7 can drive the screw assembly 62 to rotate forward. The first torsion spring 63 is connected to the screw assembly 62 at one end and to the support frame 11 at the other end. It should be understood that after the sliding of the driven assembly 7 drives the screw assembly 62 to rotate forward, the first torsion spring 63 gives the screw assembly 62 a tendency to reverse. The limiting assembly 64 can limit the reverse rotation of the screw assembly 62. After the driven assembly 7 slides multiple times, the limiting assembly 64 can be moved away from the screw assembly 62 via the unlocking assembly 65. After the limiting assembly 64 moves away from the screw assembly 62, the screw assembly 62 is reversed under the drive of the first torsion spring 63, thereby causing the expanded undulation assembly 61 to retract; after the driven assembly 7 moves the limiting assembly 64 away from the screw assembly 62 through the unlocking assembly 65, the driven assembly 7 continues to move and away from the unlocking assembly 65, and the unlocking assembly 65 is reset to re-limit the reversal of the screw assembly 62.

[0046] 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. The side of the rotating tube 611 is provided with an elongated hole, and the protrusion 612 is slidably connected to the elongated hole. The forward 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 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.

[0047] In other embodiments, 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 threaded onto the screw body, and the tapered sleeve 623 is fixed to 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 to the screw body 621. The sliding of the driven assembly 7 can drive the screw gear 624 to rotate forward, and the limiting assembly 64 can limit the reverse rotation of the ratchet 625. The first torsion spring 63 is connected to the screw gear 624 or the ratchet 625. It should be understood that the screw body 621 is located within the rotating tube 611 and is coaxial.

[0048] In other schemes, the limiting assembly 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 assembly 65 can drive the limiting gear 643 to rotate.

[0049] 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. 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.

[0050] Specifically, after multiple rotations of sliding, 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 moving the pawl 642 away from the ratchet 625. It should be understood that a single rotation 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 back to non-meshing.

[0051] 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. The wheel shaft 42 is coaxially fixed to the wheel body 41 at one end and rotatably connected to the support frame 11 at the other end. The rotating tube 611 is rotatably connected to the support frame 11 and connected to the wheel shaft 42 via the wheel connecting rod 43. The driven block 45 has multiple members and is disposed on the outer wall of the driven tube 44. The rotation of the driven block 45 can drive the driven assembly 7 to slide. Specifically, the support frame 11 is provided with a groove that matches the rotating tube 611.

[0052] In other embodiments, the driven assembly 7 includes a driven connecting rod 71, a driven rack 72, and a driven belt 73. The support frame 11 is provided with an annular groove 111. The driven connecting rod 71 is slidably connected to the annular groove 111 and is connected to the driven rack 72. The driven rack 72 can respectively engage with the lead screw gear 624 and the unlocking gear 652. The driven belt 73 tightly surrounds the driven blocks 45 on both sides, and the driven rack 72 is fixed to the driven belt 73. Specifically, the driven rack 72 is provided on the inner side of the driven belt 73. The driven belt 73 rotates with the rotation of the driven blocks 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. When passing through the driven tube 44, the driven rack 72 passes through the gaps between the driven blocks 45.

[0053] 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.

[0054] 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.

[0055] 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, they can make some simple deductions or substitutions without departing from the concept of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A speed reducer vibration noise testing device, characterized by: It includes a base plate, a support frame, a driving test assembly, a microphone, 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 provided at the top of the base plate, the driving test assembly is provided at the top of the support frame, the shock absorber and the wheel are installed on the front side of the driving test assembly, a transmission shaft is provided on the rear side of the wheel, the driving test assembly can rotate the transmission shaft, and the microphone is provided on the driving test assembly; The rotating wheel mechanism and the ups and downs testing mechanism are rotatably mounted on the support frame respectively. The rotating wheel mechanism is provided in two groups and is oppositely mounted on both sides of the ups and downs testing mechanism. The transmission belt tightly surrounds 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 wheel mechanism can drive the driven assembly to slide; the fluctuation test mechanism can expand outward to lift the transmission belt and squeeze the wheel, and the sliding of the driven assembly can drive the fluctuation test mechanism to gradually expand and directly shrink periodically; The ups and downs testing mechanism includes an ups and downs assembly, a screw assembly, a first torsion spring, a limiting assembly and an unlocking assembly; the ups and downs assembly, the limiting assembly and the unlocking assembly are respectively rotatably connected to the support frame, the screw assembly is coaxially arranged in the ups and downs assembly, the forward rotation of the screw assembly can cause the ups and downs assembly to 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 assembly can limit the reversal of the screw assembly, and the driven assembly can move the limiting assembly away from the screw assembly through the unlocking assembly after sliding multiple turns; The undulating assembly includes a rotating tube and a protrusion; the rotating tube is rotatably connected to the support frame, and a long hole is provided on the side of the rotating tube, and the protrusion is slidably connected to the long hole. The positive rotation of the screw assembly can drive the protrusion to slide outward; 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 screwed to the screw body, and the tapered sleeve is fixed to the ball nut near one end of the protrusion and can lift the protrusion; the screw gear and the ratchet are respectively coaxially fixed to the screw body, the sliding of the driven assembly can drive the screw gear to rotate forward, and the limiting assembly can limit the reverse rotation of the ratchet, and the first torsion spring is connected to the screw gear or the ratchet; The limiting assembly includes a limiting shaft, a pawl, a limiting gear and a second torsion spring; the limiting shaft is rotatably connected to the support frame, the pawl is fixed to the limiting shaft and can limit the reverse rotation of the ratchet; the limiting gear is coaxially fixed to 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; 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 respectively coaxially fixed to the unlocking shaft, the sliding of the driven assembly can drive the unlocking gear to rotate, and the incomplete gear can mesh with the limiting gear; The wheel mechanism includes a wheel body, a wheel shaft, a wheel connecting rod, a driven tube and a driven block; 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 engage with the 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.

2. A speed reducer vibration noise testing device according to claim 1, characterized in that: The wheel body is rotatably connected to the support frame, one end of the wheel 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 blocks are provided with multiple blocks and are arranged on the outer wall of the driven tube, and the rotation of the driven blocks can drive the driven assembly to slide.

3. A reducer, applied to the reducer vibration noise testing device according to claim 1 or 2, characterized in that: The speed reducer can be arranged between the wheel and the transmission shaft.

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