A gearbox test bench

Abstract

This invention relates to a gearbox test bench, comprising a frame, a suspension platform, and a lifting device. The frame includes a base frame and a gantry fixed to the base frame. The suspension platform includes a support platform, a suspension frame, and a fixing member. The two ends of the fixing member are respectively connected to the suspension frame and the support platform. The suspension frame is connected to the gantry, and the support platform is suspended above the base frame. The lifting device includes a motor and a lifting rod. The lifting rod is fixedly connected to the suspension frame. The motor drives the lifting rod to perform lifting and lowering movements to realize the lifting and lowering action of the suspension platform. This gearbox test bench has a simple structure and can be adapted to different gearboxes of actual vehicles under test.

Description

Technical Field

[0001] This invention relates to the field of automotive testing bench technology, and more specifically to a gearbox testing bench. Background Technology

[0002] The automotive gearbox is a core component of the powertrain system, and its performance directly affects the vehicle's power, economy, comfort, and safety. Therefore, comprehensive and accurate testing is a crucial part of its research and development and production process. The test bench needs to simulate real-vehicle operating conditions, providing a test environment with one input and two outputs (loads) for the gearbox. Since the horizontal and vertical distances between the input and output shafts of different real-vehicle gearbox models vary significantly, the test bench must not only have sufficient load capacity but also a wide range of vertical and horizontal adjustment to accommodate gearboxes of different sizes. This poses a significant challenge to the mechanical structure design of the test bench.

[0003] Currently, there are various test benches on the market for powertrain testing. They employ different technical solutions in terms of lifting, moving, and fixing, but all have certain limitations.

[0004] Existing patent CN 215375527 U discloses a movable platform for a motor parameter testing fixture, which can move precisely in the X, Y, and Z directions. This platform moves via a lead screw and is locked in place after adjustment using a sliding rod and nut, offering advantages such as high moving accuracy and good stability. However, because the distance between the two outputs (loads) cannot be adjusted during testing, the platform's movement on the horizontal plane cannot achieve perfect alignment between the gearbox output shaft and the load for different models of vehicle gearboxes. Any slight misalignment or non-parallelism can lead to distorted test data, damage to connecting components, and even safety accidents.

[0005] Patent CN 218995604 U discloses a liftable platform base for motor testing. This liftable platform base addresses the issue of smooth lifting under heavy loads by employing a lifting mechanism comprising four lead screw jacks linked by connecting shafts and right-angle commutators to achieve smooth lifting. However, such multi-jack linkage schemes inherently suffer from poor synchronization and complex control. During operation, even a slight error in any jack can cause the lifting plate to tilt, resulting in misalignment between the input / output shafts of the tested motor (or gearbox) and the connected load equipment. This not only affects the accuracy of test data but may also lead to equipment damage and other safety accidents. Furthermore, this solution has a complex structure, is difficult to debug, and has high maintenance costs.

[0006] Patent CN 218330595 U discloses an engine test bench that provides a method for lifting and lowering the engine using an electric hoist and suspension components, facilitating teaching demonstrations and disassembly. While this solution addresses the lifting of heavy components, its lifting mechanism (electric hoist and sling) lacks stability during lifting, prone to swaying and tilting, making it difficult to achieve the precise positioning required for testing. Furthermore, this bench primarily serves teaching demonstrations, and its fixing method (such as a fixed frame moving on a slide rail) is insufficient in rigidity and positioning accuracy for gearbox performance testing requiring high precision and stability alignment. Moreover, this test bench cannot achieve perfect alignment between the gearbox output shaft and the load for different models of real vehicle gearboxes.

[0007] In summary, existing test benches cannot achieve complete alignment between the output shaft of different types of vehicle gearboxes and the load. Therefore, there is an urgent need in the field for a new type of test bench that can achieve complete alignment between the output shaft of different types of vehicle gearboxes and the load. Summary of the Invention

[0008] The purpose of this invention is to provide a gearbox test bench with a simple structure that can be adapted to different gearboxes of real vehicles under test.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A gearbox test bench, comprising:

[0011] The frame includes a base frame and a gantry fixed to the base frame;

[0012] The suspended platform includes a support platform, a suspension frame, and a fixing component. The two ends of the fixing component are respectively connected to the suspension frame and the support platform. The suspension frame is connected to the gantry and suspends the support platform above the base frame.

[0013] The lifting device includes a motor and a lifting rod, the lifting rod being fixedly connected to the suspension frame, and the motor driving the lifting rod to perform lifting and lowering movements to realize the lifting and lowering action of the suspension platform;

[0014] The lifting rod and the suspension frame are fixedly connected by a floating joint, and the fixing component and the hanging frame are fixedly connected by a floating joint.

[0015] In one embodiment, the fastener and the support platform are fixedly connected by a floating joint.

[0016] In one embodiment, the lifting device is located at the top of the gantry.

[0017] In one embodiment, the gearbox test bench further includes a guiding device, which includes a guide sleeve fixed to the support platform and a guide rod fixed to the base frame. The guide rod passes through the guide sleeve to guide the lifting and lowering movement of the support platform.

[0018] In one embodiment, the number of guide devices is one pair, and they are respectively arranged on opposite sides of the support platform.

[0019] In one embodiment, the gearbox test bench further includes a pad, which is disposed in the space between the support platform and the base frame and supports the support platform.

[0020] In one embodiment, the suspension frame includes two intersecting brackets, and the connection between the lifting rod and the suspension frame is located at the intersection of the two brackets.

[0021] In one embodiment, each of the hanging brackets is fixedly connected to a fastener at each of its opposite ends.

[0022] In one embodiment, the lifting device is an electric screw jack, and the lifting rod is a screw.

[0023] In one embodiment, the floating joint includes an axial floating unit and a planar floating unit, the axial floating unit being used to float in the axial direction and the planar floating unit being used to move in a plane.

[0024] The present invention, employing the above-mentioned technical solution, has the following beneficial effects: the gearbox test bench provided by the present invention uses a lifting device to raise and lower the entire suspension platform, avoiding the problems of poor synchronization and low precision that occur when operating multiple screw jacks in the prior art. Simultaneously, the lifting device and the suspension platform are fixedly connected via floating joints, and the load-bearing platform and suspension frame of the suspension platform are also fixedly connected via floating joints. The floating joints generate a floating effect in the axial and horizontal directions, guiding the gearbox output shaft to automatically find and adapt to the position of the load input shaft, achieving complete alignment of the two shaft systems. This absorbs minor deviations caused by deformation of the base frame or thermal expansion, ensuring that these stresses are not transmitted to the precision gearbox bearings or the bearings of the load equipment. This allows the entire transmission chain from the gearbox output end to the load input end to be in an ideal connection state of "stress-free" or "low-stress," making the torque, speed, vibration, and other data collected by the test system more accurately reflect the performance of the gearbox itself. It eliminates interference caused by misalignment and significantly extends the service life of the test bench itself, the gearbox under test, and expensive load equipment (such as a dynamometer). Attached Figure Description

[0025] Figure 1This is a 3D view of the gearbox test bench.

[0026] Figure 2 This is a side view of the gearbox test bench.

[0027] Figure 3 This is a top view of the gearbox test bench.

[0028] Figure 4 yes Figure 2 Enlarged view of point A in the middle.

[0029] Figure 5 This is a simplified diagram illustrating the connection relationships of the suspended platforms. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0031] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0032] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0033] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0034] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0035] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0036] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] like Figures 1-3 As shown, this embodiment provides a gearbox test bench, which includes a frame 1, a suspension platform 2, and a lifting device 3. The frame 1 includes a base frame 11 and a gantry 12, wherein the base frame 11 is a flat plate for fixing to the ground or platform. The gantry 12 consists of a pair of uprights and a crossbeam. The pair of uprights are distributed on opposite sides of the base frame 11, and the bottom of the uprights is fixed to the base frame 11. The opposite ends of the crossbeam are fixedly connected to the top of the pair of uprights to form a gantry-shaped frame structure.

[0039] The suspension platform 2 includes a support platform 21, a suspension frame 22, and fixing members 23. The support platform 21 is also a flat plate used to support and fix the gearbox under test. The top of the suspension frame 22 is connected to the crossbeam of the gantry 12. The suspension frame 22 is composed of two intersecting brackets forming an X-shape. Each bracket has a fixing member 23 connected to its end. The opposite ends of the fixing members 23 are fixedly connected to the end of the bracket and the support platform, respectively, so that the support platform 21 is suspended on the gantry 12 and suspended between the support platform 21 and the base frame 11. In this embodiment, the support platform 21 has a roughly rectangular structure, and four fixing members 23 are fixed to the four corners of the support platform 21.

[0040] The lifting device 3 includes a motor and a lifting rod. The lifting rod is connected to the suspension frame 22, and the motor is driven by the lifting rod to drive the entire suspension platform 2 to move up and down. In this embodiment, the lifting device 3 is an electric screw jack, which includes a motor 31, a screw 32, and a nut 33. The screw 32 acts as the lifting rod, and its bottom is fixedly connected to the suspension frame 22. The motor 31 drives the screw to rotate through a coupling. The nut 33, which meshes with the screw 32, converts the rotational motion into the linear motion of the screw, thereby driving the entire suspension platform 2 to move up and down. The motor 31 is fixedly installed on the top of the gantry 12, and the nut 33 is fixed to the crossbeam of the gantry 12. The screw 32 meshes with the nut 33, and the motor 31 is driven by the screw 32, thereby driving the screw 32 to move up and down. In this embodiment, the gearbox test bench places the entire lifting device 3 above the mechanism, so the minimum lifting height of the gearbox test bench is not limited by the height of the lifting device 3. Moreover, the entire gearbox test bench has only one screw jack, which lifts the entire suspension platform 2 to move in the height direction. Therefore, the problems of poor synchronization and low accuracy that exist in existing gearbox test benches will not occur, and maintenance costs will also be reduced.

[0041] In existing testing platforms, due to differences in the horizontal and vertical distances between the input and output shafts of gearboxes from different manufacturers and of different models, and even differences in the horizontal and vertical distances between the input and output shafts of gearboxes from the same manufacturer and of the same model due to manufacturing tolerances and installation errors, these minute alignment errors can be drastically amplified under high-speed, high-torque testing conditions, leading to significant additional stress at connection points (such as couplings). This severely affects the accuracy of the test data and fails to truly reflect the performance of the gearbox. Therefore, in this embodiment, see... Figures 4-5 The lead screw 32 and the suspension frame 22 are fixedly connected by a first floating joint 34. The upper end of each fixing member 23 is connected to the bracket end of the suspension frame 22 by a second floating joint 35, and the lower end of each fixing member 23 is connected to the support platform 21 by a third floating joint 36. Figure 4 A typical structure of the first floating joint is shown. The floating joint's internal structure, through spherical surfaces, elastic elements, or gap structures, allows for radial, angular, and axial displacement within its design range. The second and third floating joints have the same structure as the first floating joint and therefore will not be described in detail. See also... Figure 4 The first floating joint 34 includes an axial floating unit 341 and a planar floating unit 342. The axial floating unit 341 is mainly used for the floating joint to float in the axial direction. The planar floating unit 342 enables the suspension platform 2 to move within a specified plane, so that the entire suspension platform 2 can move within a certain range in three-dimensional space.

[0042] See Figure 5 , Figure 5 A simplified schematic diagram of the connection relationship of the suspension platform 2 is shown. When the connector (such as the flange) on the gearbox output shaft contacts the connector on the load input shaft, under the action of the contact force, the entire suspension platform (including the bearing platform 21 and the suspension frame 22) will not be stuck or generate huge internal stress like a rigid system. Instead, it will drive the gearbox output shaft to produce a floating effect through the deflection of the third floating joint and the second floating joint, as well as the compensation in the height direction. This floating effect will guide the output shaft to automatically find and adapt to the position of the load input shaft, ultimately achieving perfect alignment of the two shaft systems. Once the alignment is completed and the connection is tightened, the floating joint system can absorb the small deviations caused by the deformation of the base frame or thermal expansion, ensuring that these stresses are not transmitted to the precision gearbox bearings or the bearings of the load equipment. This means that the entire transmission chain from the gearbox output end to the load input end is in an ideal connection state of "stress-free" or "low-stress". Through the fundamental improvement of alignment accuracy and the elimination of internal stress, the torque, speed, vibration and other data collected by the test system can more accurately reflect the performance of the gearbox itself, eliminating the interference caused by misalignment. At the same time, it also greatly extends the service life of the test bench itself, the gearbox under test, and expensive load equipment (such as dynamometers). Then, the suspension platform 2 is aligned with the lifting rod of the lifting device 3 through the first floating joint, so that the lifting device 3 can precisely lift the entire suspension platform 2.

[0043] In one embodiment, the gearbox test bench is further provided with a pair of guide devices 4, which are arranged on opposite sides of the support platform 21 to guide the lifting and lowering of the support platform 21. Specifically, the guide device 4 includes a guide sleeve 41 and a guide rod 42. The guide sleeve 41 is fixedly installed on the support platform 21, and the bottom end of the guide rod 42 is fixed on the base frame 11 and passes through the guide sleeve 41. The cooperation between the guide rod 42 and the guide sleeve 41 guides the lifting and lowering of the support platform 21.

[0044] In one embodiment, the gearbox test bench also includes a pad 5. After the gearbox 6 under test is fixedly installed on the support platform 21, and the output shaft of the gearbox 6 under test is fixedly connected to the load mechanism 7 by the lifting device 3, the pad 5 is placed in the space between the support platform 21 and the base frame 11 to ensure that the gearbox under test will not shake due to the support platform 21 being suspended during the test, thus ensuring the safety and accuracy of the test.

[0045] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A reduction gearbox test bench, characterized in that, The utility model relates to a kind of speed reducer test bench, including: rack, including chassis and door frame fixed to the chassis;Suspension platform, including bearing table, suspension frame and fixing piece, the opposite ends of the fixing piece are connected suspension frame and bearing table respectively, the suspension frame is connected with the door frame, and bearing table is suspended and arranged above the chassis;Lifting device, including motor and lifting rod, the lifting rod is fixedly connected with the suspension frame, and the motor drives the lifting rod to make lifting motion, to realize the lifting action of the suspension platform;The suspension frame includes two mutually intersecting suspension frames, the connection of the lifting rod and the suspension frame is located at the intersection of two suspension frames, and the lifting rod and the suspension frame are fixedly connected by floating joint;The opposite ends of each suspension frame are fixedly connected with a fixing piece, and the fixing piece and the suspension frame are fixedly connected by floating joint;The fixing piece and the bearing table are fixedly connected by floating joint;The floating joint includes axial floating unit and plane floating unit, and the axial floating unit is used to float in axial direction, and the plane floating unit is used to move in plane. The lifting device is arranged at the top of the door frame. The speed reducer test bench further includes guiding device, and the guiding device includes guiding sleeve fixed to the bearing table and guiding rod fixed to the chassis, the guiding rod is arranged in the guiding sleeve, to guide the lifting motion of the bearing table. The number of guiding device is a pair, and is arranged at the opposite sides of the bearing table respectively. The speed reducer test bench further includes gasket, and the gasket is arranged in the space between the bearing table and the chassis, and supports the bearing table. The lifting device is electric screw rod lifting machine, and the lifting rod is screw rod. ​ ​ 2. The reduction gearbox test bench of claim 1, wherein, ​ 3. The reduction gearbox test bench of claim 1, wherein, ​ 4. The reduction gearbox test bench of claim 3, wherein, ​ 5. The reduction gearbox test bench of claim 1, wherein, ​ 6. The reduction gearbox test bench of claim 1, wherein, ​

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