A device for aligning the center of a motorcycle rear wheel axle with the axis of a dynamometer drum

Abstract

The utility model belongs to motorcycle emission detection field discloses a kind of motorcycle rear wheel axle center and dynamometer drum axis calibration device, and its wire clamping alignment ground mark establishes reference by horizontal positioning rod being placed in front of dynamometer hub, and two ends horizontal monitoring unit ensure ground level;The flexible position adjustment of telescopic height adjusting lever and the horizontal adjusting lever of top connected vertically can be accurately aligned motorcycle rear wheel axle center by end centering indication unit.The calibration device provides stable horizontal reference by wire clamping in combination with ground mark, and horizontal monitoring eliminates inclination error, and telescopic link adapts to height and horizontal change, and centering unit realizes axis accurate alignment, forms objective, quantifiable spatial positioning mechanism.Using the device can greatly improve positioning accuracy to meet specification requirements, provide traceable measurement tool to enhance standardization, significantly shorten adjustment time to improve efficiency, and eliminate subjective human error, ensure result reliability and emission test data accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of motorcycle emission testing technology, specifically relating to the processing of asymmetric shape castings, and particularly to a calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum. Background Technology

[0002] In the field of pollutant emission testing within the motorcycle industry, there are clear requirements for the standardization of emission tests. One of the core aspects is the installation and positioning of the motorcycle. Standards stipulate that during testing, the center axis of the motorcycle's rear wheel hub must be aligned with the axis of the dynamometer drum on the chassis, which is perpendicular to the horizontal ground. This is a fundamental prerequisite for ensuring the validity of emission test data. However, currently, the industry generally lacks standardized and professional measurement tools for this crucial positioning step. In practice, installation and positioning are mainly performed by operators through visual observation, and this traditional method has become the mainstream operating mode in the industry.

[0003] Existing positioning methods relying on manual visual inspection have several significant drawbacks: In terms of positioning accuracy, the spatial relationship positioning accuracy is extremely poor, with measured data showing an average deviation of 3.8±1.2mm between the two axes, far from meeting the accuracy requirements of the test specifications; in terms of measurement standardization, this method lacks effective tools for quantifying spatial position measurement, failing to meet the relevant requirements for the traceability of measurement equipment; in terms of work efficiency, vertical alignment is time-consuming, with an average installation and adjustment time of 12.6±3.5 minutes per session, severely impacting the test progress; and in terms of result reliability, human observation is highly subjective, easily introducing significant human error, directly leading to poor reliability of spatial position results, thus affecting the accuracy and reliability of emission test data, and in extreme cases, even invalidating the entire test result.

[0004] It is evident that the existing motorcycle emissions testing method, which relies on manual visual inspection for axis positioning, is inadequate in terms of accuracy, efficiency, standardization, and reliability, and therefore cannot meet the requirements of the testing specifications. Utility Model Content

[0005] This invention provides a calibration device for aligning the center of the rear wheel axle of a motorcycle with the axis of the dynamometer drum. Using this calibration device can effectively solve the problems of insufficient accuracy, efficiency, standardization and reliability of the existing axis positioning method that relies on manual visual inspection in motorcycle emission tests, and thus meet the test specifications.

[0006] To achieve the above objectives, the present invention adopts the following technical content: A calibration device for aligning the center of the rear wheel axle of a motorcycle with the axis of a dynamometer drum, comprising: a horizontal positioning rod; The horizontal positioning rod is placed in front of the part of the dynamometer hub that is exposed above the ground; The middle part of the horizontal positioning rod is provided with a locking line, which is used to align with the ground marking point on the central axis of the dynamometer drum. Each end of the horizontal positioning rod is equipped with a horizontal monitoring unit, which is used to observe whether the ground is currently level. The horizontal positioning rod is vertically connected to a retractable height adjustment rod. The top of the height adjustment rod is connected to a retractable horizontal adjustment rod; The end of the horizontal adjustment rod is provided with a centering indicator unit for aligning with the rear wheel hub axle of the motorcycle.

[0007] Furthermore, the bottom of both sides of the horizontal positioning rod is provided with a gasket groove, which can accommodate gaskets of different thicknesses to keep the two sides of the horizontal positioning rod in a horizontal state.

[0008] Furthermore, the horizontal positioning rod is made of aluminum alloy, and two parallel locking lines are provided in the middle of the rod body.

[0009] Furthermore, the level monitoring unit includes a first level and a second level, the first level being connected to one end of the level positioning rod and the second level being connected to the other end of the level positioning rod.

[0010] Furthermore, the first level and the second level are arranged symmetrically, and both are bar bubble levels.

[0011] Furthermore, the height adjustment rod is connected to the center point of the horizontal positioning rod via a universal connector.

[0012] Furthermore, the height adjustment rod is equipped with length scale markings and a locking device.

[0013] Furthermore, the horizontal adjustment rod is equipped with length scale markings and a locking device.

[0014] Furthermore, the centering indicator unit at the end of the horizontal adjustment rod adopts a circular centering sight.

[0015] Furthermore, the extension range of the height adjustment rod is 100~1000mm; the extension range of the horizontal adjustment rod is 20~800mm.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a calibration device for aligning the rear wheel axle center of a motorcycle with the axis of a dynamometer drum. A horizontal positioning rod is placed in front of the dynamometer drum, with its guide rail aligned with ground markings to establish a reference. Horizontal monitoring units at both ends ensure the ground is level. A vertically connected telescopic height adjustment rod and a top horizontal adjustment rod allow for flexible position adjustment, while an end-alignment indicator unit precisely aligns with the motorcycle's rear wheel axle center. This calibration device provides a stable horizontal reference through the guide rail and ground markings, eliminates tilt errors through horizontal monitoring, adapts to changes in height and level, and achieves precise axis alignment through the alignment unit, forming an objective and quantifiable spatial positioning mechanism. Using this device significantly improves positioning accuracy to meet regulatory requirements, provides a traceable measurement tool to enhance standardization, significantly reduces adjustment time and improves efficiency, eliminates subjective human error, and ensures the reliability of results and the accuracy of emission test data.

[0017] Preferably, in this invention, shim grooves are provided at the bottom of both sides of the horizontal positioning rod, allowing shims of different thicknesses to be installed, so that the rod can be adjusted to a horizontal state even under non-ideal ground conditions, enhancing the adaptability of the device to uneven environments, avoiding reference deviations caused by ground inclination, and further improving the stability and accuracy of the overall measurement.

[0018] Preferably, in this invention, the horizontal positioning rod is made of aluminum alloy, which combines lightweight and high strength, making it easy to carry and operate; two parallel alignment lines are opened on the rod body to provide redundant alignment reference, reduce visual errors when aligning with a single line, and improve the accuracy and reliability of ground mark alignment.

[0019] Preferably, in this invention, the level monitoring unit uses a first level and a second level, which are respectively connected to both ends of the level positioning rod to achieve comprehensive monitoring of the overall levelness of the rod, effectively identify local unevenness problems, ensure that the reference plane is uniform and reliable, and reduce systematic errors in the measurement process.

[0020] Preferably, in this invention, the first level and the second level are symmetrically arranged and both adopt a bar bubble level, which provides intuitive and easy-to-read visual feedback. The bubble design simplifies the level judgment process, improves operational efficiency, and ensures the consistency and reliability of the level monitoring results.

[0021] Preferably, in this invention, the height adjustment rod is connected to the center point of the horizontal positioning rod via a universal connector, allowing for free adjustment at multiple angles, enhancing the device's adaptability to spatial changes, facilitating fine-tuning of the position in complex installation environments, and improving the flexibility and accuracy of the calibration process.

[0022] Preferably, in this invention, the height adjustment rod is equipped with a length scale mark and a locking device. The scale mark facilitates the precise setting of height parameters, while the locking device fixes the adjusted position to prevent accidental displacement and ensures the controllability of height adjustment and the repeatability of measurement results.

[0023] Preferably, in this invention, the horizontal adjustment rod is equipped with a length scale mark and a locking device. The scale mark supports precise control of the horizontal extension distance, and the locking device securely fixes the adjustment position, so that the centering indicator unit can be aligned with the target more accurately and reliably, thereby improving the stability and efficiency of the overall calibration.

[0024] Preferably, in this invention, the centering indicator unit adopts a circular centering sight, which provides a clear and intuitive visual alignment point, simplifies the operation steps, and enhances the accuracy of the wheel axle center aiming, ensuring effective alignment between the motorcycle rear wheel axle and the dynamometer axis.

[0025] Preferably, in this invention, the extendable range design of the height adjustment rod and the horizontal adjustment rod adapts to different sizes of motorcycles and dynamometer configurations, ensuring the versatility and convenience of the device in various testing scenarios, and meeting diverse needs without the need for additional tools. Attached Figure Description

[0026] Figure 1 A schematic diagram illustrating the motorcycle installation requirements during the testing process provided for an embodiment of this utility model; Figure 2 A front view of a calibration device for aligning the center of the rear wheel axle of a motorcycle with the axis of a dynamometer drum, provided in an embodiment of this utility model; Figure 3 The left view of a calibration device for aligning the center of the rear wheel axle of a motorcycle with the axis of the dynamometer drum, provided in an embodiment of this utility model.

[0027] Figure label: 1. Dynamometer drum; 2. Horizontal positioning rod; 3. First level; 4. Height adjustment rod; 5. Horizontal adjustment rod; 6. Cable clamp; 7. Second level; 8. Ground marking point on the dynamometer drum center shaft; 9. Dynamometer drum center shaft; 11. Motorcycle rear wheel hub center shaft. Detailed Implementation

[0028] To make the technical problem solved by this utility model, the technical solution, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "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 utility model according to the specific circumstances.

[0035] As mentioned in the background section, such as Figure 1As shown, according to the mandatory national standard GB 14622-2016 "Limits and Measurement Methods for Pollutant Emissions from Motorcycles," during motorcycle emission tests, the center axis of the motorcycle's rear wheel hub and the axis of the chassis dynamometer drum must be aligned on the same straight line perpendicular to the horizontal ground. Currently, the industry generally lacks standardized measuring tools, relying mainly on operators' visual inspection for installation and positioning. This method suffers from significant drawbacks, including strong subjectivity, low accuracy, inability to quantify, low efficiency, and susceptibility to human error. Consequently, the installation and positioning accuracy fails to meet the requirements of the test specifications, affecting the accuracy and reliability of emission test data, and may even invalidate the test results.

[0036] To address the aforementioned issues, this embodiment provides a calibration device for the rear wheel axle center of a motorcycle and the axis of the dynamometer drum. Specifically, it provides a device capable of quickly, accurately, and precisely measuring the positional relationship between the motorcycle's rear wheel hub and the dynamometer drum axis. This motorcycle emissions testing rear wheel hub and dynamometer drum axis positioning device ensures that the two axes are strictly aligned on the same straight line perpendicular to the horizontal ground, thereby improving installation efficiency, eliminating human error, ensuring that the emissions testing installation process meets regulatory requirements, and ultimately enhancing the accuracy and reliability of the test data.

[0037] like Figure 2 As shown, this embodiment provides a calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum, comprising three parts: a reference establishment unit, a level monitoring unit, and a centering execution unit. The reference establishment unit uses a horizontal positioning rod 2 as its core. The horizontal positioning rod 2 is made of aluminum alloy, with a length of 1200mm, combining lightweight and durability. Two parallel clamping lines 6 are precisely machined in the middle of the rod, with a width of 1mm and a spacing of 50mm. This spacing matches the specifications of the ground marking point 8 on the center axis of the dynamometer drum, enabling precise engagement with the ground marking point. Simultaneously, shim grooves are provided on both sides of the bottom of the horizontal positioning rod 2, into which standard shims of different thicknesses can be inserted to adjust the horizontal state of the positioning rod. The level monitoring unit includes a first level 3 and a second level 7, which are symmetrically installed on the horizontal positioning rod 2 at 100mm from each end using a special clamp. Both levels are bar bubble levels with an accuracy of 0.02 mm / m, which can visually reflect the horizontal status of the horizontal positioning rod 2 and the installation ground, providing accuracy assurance for the establishment of the device's reference. The centering actuator is a telescopic and adjustable rod structure, specifically including a telescopic height adjustment rod 4 and a horizontal adjustment rod 5. The connections and parameters of each component are as follows: In this embodiment, the height adjustment rod 4, i.e., the longitudinal telescopic rod, is vertically connected to the center point of the horizontal positioning rod 2 via a universal connector. Its telescopic range is 100~1000mm, the rod body is equipped with millimeter-level length markings, and it is equipped with a handwheel-type locking device, which can achieve precise height adjustment and fixation.

[0038] In this embodiment, the horizontal adjustment rod 5, also known as the lateral telescopic rod, is connected to the top of the height adjustment rod 4 via a rotating connector. Its telescopic range is 20~800mm, and it also features millimeter-level length markings and a handwheel-type locking device. The end of the horizontal adjustment rod 5 is equipped with a circular centering sight as a centering indicator unit. The center of the sight has a 3mm diameter red circular mark for precise alignment with the motorcycle's rear wheel hub axle 11.

[0039] Explained, the components of this device adopt a quick-connect structure, which facilitates disassembly, carrying and on-site assembly, and will not be elaborated further here.

[0040] The specific usage method for the aforementioned motorcycle rear wheel axle center and dynamometer drum axis alignment device is as follows: (1) Establishment and leveling of benchmarks: 1. Place the horizontal positioning rod 2 flat on the ground in front of the exposed part of the dynamometer hub 1, ensuring that the extension direction of the rod is perpendicular to the axis of the dynamometer hub 1; 2. Slowly move and fine-tune the position and angle of the horizontal positioning rod 2 so that the two parallel locking lines 6 in the middle of the rod body are precisely locked with the ground mark 8 of the dynamometer drum center axis that has been marked in advance on the ground, and ensure that the locking lines 6 are completely aligned with the ground mark 8 to initially establish a benchmark; 3. Observe the bubble positions of the first level 3 and the second level 7: If both bubbles are at the center scale line, it indicates that the ground and the level positioning rod 2 are level; if the bubble on one side is off-center, it indicates that the ground on the corresponding side is lower. At this time, insert a standard shim of appropriate thickness into the shim groove of the level positioning rod 2 on that side, and repeatedly fine-tune the shim thickness until the bubbles of both levels are strictly centered. At this time, the reference plane established by the level positioning rod 2 precisely corresponds to the vertical projection of the dynamometer drum center axis 9, and the reference is established.

[0041] (2) Vehicle positioning and rough adjustment: Slowly push the motorcycle to be tested onto the dynamometer, ensuring that the rear wheel of the motorcycle makes stable contact with the surface of the dynamometer's rotating hub 1. Initially adjust the position of the motorcycle to ensure that the rear wheel is in the middle area of ​​the rotating hub 1, thus avoiding excessive adjustment during subsequent centering operations.

[0042] (3) Centering operation: 1. Loosen the locking handwheel of the height adjustment lever 4. Based on the approximate height of the motorcycle rear wheel hub axle 11, stretch or retract the height adjustment lever 4 so that the circular centering sight at the end of the horizontal adjustment lever 5 is close to the position of the motorcycle rear wheel hub axle 11 in height. After adjustment, tighten the locking handwheel of the height adjustment lever 4 to fix its length. 2. Loosen the locking handwheel of the horizontal adjustment rod 5, and slowly extend the horizontal adjustment rod 5 towards the motorcycle so that the circular centering sight gradually approaches the center fixing screw of the motorcycle's rear wheel hub axle 11. 3. Fine-tune the extension length and angle of the horizontal adjustment rod 5. The operator must keep their eyes perpendicular to the centering sight and observe the relative position of the red circular mark in the center of the sight and the screw of the wheel hub center axle 11 until the circular outline of the screw is completely concentrically aligned with the red mark to complete the centering.

[0043] (4) Final verification and positioning completed 1. During and after the centering operation, it is necessary to reconfirm whether the bubbles of the first level 3 and the second level 7 are still in the center position. If the bubbles are off-center, the ground level must be checked again and the shims adjusted to ensure that the reference has not changed. 2. When both conditions are met simultaneously, namely "the two level bubble bubbles are centered" and "the centering sight is precisely aligned with the wheel hub center shaft 11", it indicates that the motorcycle rear wheel hub center shaft 11 and the dynamometer drum center shaft 9 are on the same straight line perpendicular to the horizontal ground, and the axis calibration is completed. 3. Tighten all locking devices on the height adjustment rod 4 and the level adjustment rod 5 again, and record the scale readings on the two adjustment rods. This data can be used as a reference for the next calibration of the same model of motorcycle, so as to achieve quantitative management and traceability. 4. Carefully remove the entire calibration device, avoiding contact with the motorcycle or dynamometer. Once the motorcycle's positioning remains unchanged, proceed to the subsequent emissions testing stage.

[0044] In summary, this utility model provides a calibration device for aligning the center of the rear wheel axle of a motorcycle with the axis of the dynamometer drum. Compared with existing positioning or calibration methods, it has the following advantages: First, the benchmark stability advantage: the benchmark is established by ground marking point 8 on the central axis of the dynamometer drum, without the need to mount the device on the dynamometer drum 1, which effectively avoids errors caused by drum surface wear, diameter difference or surface stains, making the benchmark more reliable; Second, high positioning accuracy: thanks to the high-precision monitoring of the level and the scaled control of the adjustment rod, the alignment deviation between the motorcycle rear wheel hub shaft 11 and the dynamometer drum shaft 9 can be stably controlled within ±0.5mm, which fully meets the accuracy requirements of the emission test. Third, improved operational efficiency: Compared with the traditional visual inspection method, the calibration process of this device is more standardized, and the average installation and adjustment time is only 2 minutes, which greatly shortens the test preparation time; Fourth, data traceability: By recording the scale readings of the adjustment rod, quantitative parameters are provided for each calibration operation, which meets the requirements of the laboratory quality management system for equipment traceability and effectively ensures the accuracy and repeatability of emission test data.

[0045] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A device for calibrating the center of a motorcycle rear wheel axle with the axis of a dynamometer drum, characterized in that, include: Horizontal positioning rod (2); The horizontal positioning rod (2) is placed in front of the part of the dynamometer hub (1) that is exposed above the ground; The middle part of the horizontal positioning rod (2) is provided with a clamping line (6), which is used to align with the ground marking point (8) on the central shaft of the dynamometer drum. The horizontal positioning rod (2) is equipped with a horizontal monitoring unit at each end, which is used to observe whether the ground is level. The horizontal positioning rod (2) is vertically connected to a retractable height adjustment rod (4). The height adjustment rod (4) is connected to a retractable horizontal adjustment rod (5) at the top. The end of the horizontal adjustment rod (5) is provided with a centering indicator unit for aligning with the motorcycle rear wheel hub center axle (11).

2. The calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum according to claim 1, characterized in that, The bottom of both sides of the horizontal positioning rod (2) is provided with a gasket groove, which can accommodate gaskets of different thicknesses so that the two sides of the horizontal positioning rod (2) are in a horizontal state.

3. The calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum according to claim 1, characterized in that, The horizontal positioning rod (2) is made of aluminum alloy, and two parallel locking lines (6) are opened in the middle of the rod body.

4. The calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum according to claim 1, characterized in that, The level monitoring unit includes a first level (3) and a second level (7). The first level (3) is connected to one end of the level positioning rod (2), and the second level (7) is connected to the other end of the level positioning rod (2).

5. The calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum according to claim 4, characterized in that, The first level (3) and the second level (7) are symmetrically arranged and both are strip bubble levels.

6. The calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum according to claim 1, characterized in that, The height adjustment rod (4) is connected to the center point of the horizontal positioning rod (2) via a universal connector.

7. The calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum according to claim 1, characterized in that, The height adjustment rod (4) is equipped with length scale markings and a locking device.

8. The calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum according to claim 1, characterized in that, The horizontal adjustment rod (5) is equipped with length scale markings and a locking device.

9. A calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum, as described in claim 1, is characterized in that... The centering indicator unit at the end of the horizontal adjustment rod (5) adopts a circular centering aiming device.

10. A calibration device for the center of the rear wheel axle of a motorcycle and the axis of the dynamometer drum, as described in claim 1, is characterized in that... The extension range of the height adjustment rod (4) is 100~1000mm; the extension range of the horizontal adjustment rod (5) is 20~800mm.

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