Device for measuring sliding friction coefficient of wheel

Abstract

The utility model discloses a device for measuring the sliding friction coefficient of a wheel. The device comprises a bottom plate, a sliding seat, a sliding plate, a sliding block and a moving mechanism, the sliding seat is arranged at one end of the bottom plate, the moving mechanism is arranged at the other end of the bottom plate, one end of the sliding plate penetrates through the sliding seat in a sliding mode, the other end of the sliding plate is hinged to the sliding block, and the moving mechanism is sleeved with the sliding block. A friction base material is arranged on the surface of the sliding plate, and the sliding plate is in an inclined state. Compared with the prior art, the device provided by the utility model is simple, convenient and effective to operate.

Description

Technical Field

[0001] This utility model relates to the field of sliding friction coefficient measurement technology, and in particular to a wheel sliding friction coefficient measurement device. Background Technology

[0002] Polyurethane wheels, installed on equipment or vehicles as drive wheels, propel the equipment or vehicle through friction between the polyurethane and the track or road surface. When the equipment or vehicle brakes and stops on a sloped track or road surface, the friction between the polyurethane and the track or road surface prevents slippage. Therefore, the coefficient of sliding friction needs to be measured when designing polyurethane wheels.

[0003] Currently available methods or apparatus for determining the coefficient of friction of rollers typically involve using a traction device to pull the roller along, and then calculating the coefficient of friction based on the measured traction force and the normal pressure exerted by the roller on the substrate. However, in this method, errors in the force-measuring device used to measure the traction force can affect the calculated coefficient of friction.

[0004] Therefore, there is an urgent need to design simpler and more effective measurement methods. Utility Model Content

[0005] In view of the above-mentioned problems existing in the prior art, the aim is to provide a device for measuring the coefficient of sliding friction of a wheel.

[0006] The specific technical solution is as follows:

[0007] A device for measuring the coefficient of sliding friction of a wheel; mainly comprising a base plate, a sliding seat, a sliding plate, a slider, and a moving mechanism;

[0008] The sliding seat is disposed at one end of the base plate, the moving mechanism is disposed at the other end of the base plate, one end of the sliding plate slides through the sliding seat, the other end of the sliding plate is hinged to the slider, and the slider is sleeved on the moving mechanism;

[0009] The slide plate has a friction substrate on its surface and is tilted.

[0010] The aforementioned wheel sliding friction coefficient measuring device also has the following feature: the sliding seat includes a vertical plate, a sliding bushing, and a sliding shaft;

[0011] The upright plate is mounted on the base plate, and the sliding shaft is mounted on the side of the upright plate. The sliding shaft is installed in the sliding shaft sleeve and can move within the sliding shaft sleeve. The sliding shaft has a mounting hole for mounting the sliding plate. The sliding plate slides through the mounting hole. The sliding shaft sleeve has a clearance hole for the sliding plate.

[0012] The aforementioned wheel sliding friction coefficient measuring device also has the following feature: the moving mechanism includes a mounting base, a lead screw, and a lead screw nut.

[0013] The mounting base is disposed on the base plate, one end of the slider is slidably locked in the mounting base, the other end of the slider is sleeved on the lead screw, and the lead screw is sleeved with the lead screw nut.

[0014] The aforementioned wheel sliding friction coefficient measuring device also has the following feature: a scale line is provided on the side of the mounting base parallel to the axis of the lead screw, and a marking line is provided on the side of the slider.

[0015] The aforementioned wheel sliding friction coefficient measuring device also has the feature that the scale lines are formed by the value of tanθ.

[0016] The aforementioned wheel sliding friction coefficient measuring device also has the following feature: a first support and a second support are respectively provided at both ends of the mounting base, both the first support and the second support are provided on the base plate, and both ends of the lead screw pass through the first support and the second support respectively.

[0017] The aforementioned wheel sliding friction coefficient measuring device also has the following feature: a T-shaped groove is provided in the mounting base, and one end of the slider is slidably engaged in the T-shaped groove.

[0018] The aforementioned wheel sliding friction coefficient measuring device also has the feature that a limiting plate is provided at the end of the slide plate near the slider.

[0019] The aforementioned wheel sliding friction coefficient measuring device also includes a wheel bracket, which has a receiving hole for accommodating the wheel to be tested. One end of the receiving hole is open, and a rolling element is provided at the open end of the wheel bracket. The rolling element can roll and cooperate with the outer side of the slide plate.

[0020] The aforementioned wheel sliding friction coefficient measuring device also has the following feature: fastening holes are provided on both opposite sides of the wheel bracket, and fasteners are inserted through the fastening holes and the wheel to be tested to mount the wheel to be tested on the wheel bracket.

[0021] The positive effects of the above technical solution are:

[0022] This utility model provides a wheel sliding friction coefficient measuring device. The wheel to be tested is placed on a sliding plate, and the tilt angle of the sliding plate is increased by operating the moving mechanism. The tilt angle θ when the wheel to be tested begins to slide can be obtained, and then the value of tanθ can be obtained, which is the sliding friction coefficient between the wheel to be tested and the substrate. The device is equipped with scale lines and marking lines, so the value of tanθ can be read directly. This provides a more direct way to obtain the sliding friction coefficient between the wheel to be tested and the substrate. Compared with the prior art, the device is simple, convenient and effective to operate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a wheel sliding friction coefficient measuring device according to the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure;

[0025] Figure 3 This is a schematic diagram of the assembly structure of the wheel bracket and the polyurethane wheel of this utility model;

[0026] Figure 4 This is a schematic diagram of the scale line structure of this utility model.

[0027] In the attached diagram: 1. Base plate; 2. Slide plate; 3. Slider; 31. Lug; 4. Vertical plate; 51. Clearance hole; 52. Sleeve body; 53. Flange; 54. Cover plate; 6. Sliding shaft; 71. First seat plate; 72. Second seat plate; 8. Lead screw; 9. Lead screw nut; 101. First support; 102. Second support; 11. Handwheel; 12. Wheel bracket; 122. First bushing; 123. Second bushing; 124. Third bushing; 13. Bearing; 14. Bolt; 15. Limiting plate; 16. Hinge shaft; 17. Nut; 100. Polyurethane wheel; A. Scale line; B. Marking line. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] Please see Figures 1 to 4 This embodiment illustrates a preferred embodiment of a wheel sliding friction coefficient measuring device applicable to the measurement of various wheels, such as polyurethane wheels 100 and other wheels. In this embodiment, polyurethane wheels 100 (the wheel to be tested) are used as an example for illustration. The wheel sliding friction coefficient measuring device includes: a base plate 1, a sliding seat, a sliding plate 2, a slider 3, and a moving mechanism.

[0032] The sliding seat is located at one end of the base plate 1, the moving mechanism is located at the other end of the base plate 1, one end of the slide plate 2 slides through the sliding seat, the other end of the slide plate 2 is hinged to the slider 3, and the slider 3 is sleeved on the moving mechanism.

[0033] The slide plate 2 has a friction substrate on its surface and is tilted.

[0034] Specifically, the sliding seat includes a vertical plate 4, a sliding sleeve, and a sliding shaft 6;

[0035] The upright plate 4 is mounted on the base plate 1, the sliding shaft is mounted on the side of the upright plate 4, the sliding shaft 6 is mounted in the sliding shaft sleeve and can move in the sliding shaft sleeve, the sliding shaft 6 has a mounting hole for mounting the sliding plate 2, the sliding plate 2 slides through the mounting hole, and the sliding shaft sleeve has a clearance hole 51 for the sliding plate 2.

[0036] Optionally, in this embodiment, the upright plate 4 is configured as an L-shaped plate. Optionally, in this embodiment, the sliding sleeve is a sleeve-type structure, including a sleeve body 52 and flanges 53 disposed at both ends of the sleeve body 52. ​​The sleeve body 52 has a circular hole, and an avoidance hole 51 is formed on the sleeve body 52. ​​The flanges 53 can be connected to the upright plate 4 by screws, bolts 14, or other structures. Both flanges 53 are perforated flanges, and a cover plate 54 is also required on the flange 53 at the end away from the upright plate 4 to achieve axial blocking and positioning of the sliding shaft 6. In another embodiment, one flange 53 at both ends of the sleeve body 52 is configured as a perforated flange, and the other is directly configured as a non-perforated flange. The perforated flange is disposed at the end of the upright plate 4, and the non-perforated flange is disposed at the end away from the upright plate 4. In this case, a separate cover plate is no longer required.

[0037] Optionally, in other embodiments, two upright plates 4 may be provided, arranged in parallel, with the two ends of the sliding bushing respectively mounted on the two upright plates 4. In this case, a separate cover plate 54 may not be required.

[0038] Among them, the sliding shaft 6 is a round shaft, which is installed in the round hole of the sliding shaft sleeve and can move within it to rotate with the sliding plate 2.

[0039] The size of the clearance hole 51 needs to be larger than the size of the mounting hole, mainly because the process of the slide plate 2 tilting and rotating will cause displacement relative to the stationary slide sleeve.

[0040] The upper surface of the slider 3 is provided with a lug 31, which extends into the slide plate 2 and is hinged by a hinge shaft 16.

[0041] Optionally, in this embodiment, the moving mechanism includes a mounting base, a lead screw 8, and a lead screw nut 9;

[0042] The mounting base is set on the base plate 1. One end of the slider 3 is slidably locked in the mounting base, and the other end of the slider 3 is sleeved on the lead screw 8. The lead screw 8 is sleeved with a lead screw nut 9.

[0043] Optionally, the mounting base is provided with a T-slot, and one end of the slider 3 is slidably engaged in the T-slot so that the slider 3 can slide along the T-slot to guide the slider 3. Optionally, in this embodiment, the mounting base includes a first base plate 71 and a second base plate 72, with a gap between the first base plate 71 and the second base plate 72, which forms the T-slot.

[0044] Furthermore, a first support 101 and a second support 102 are respectively provided at both ends of the mounting base. Both the first support 101 and the second support 102 are disposed on the base plate 1, and both ends of the lead screw 8 pass through the first support 101 and the second support 102 respectively. Optionally, the first support 101 and the second support 102 can be block structures or plate-shaped parts. For example, in this embodiment, both the first support 101 and the second support 102 are L-shaped plates. The first support 101 is disposed at the end of the mounting base closer to the sliding seat, and the second support 102 is disposed at the end of the mounting base away from the sliding seat.

[0045] Optionally, a handwheel 11 is provided at the end of the lead screw 8 near the second support 102 for rotating the lead screw 8. A shoulder or a retaining ring is provided at the end of the lead screw 8 near the first support 101 to prevent the lead screw 8 from dislodging from the first support 101.

[0046] Optionally, a limiting plate 15 is provided at one end of the slide plate 2 near the slider 3. The limiting plate 15 is used to limit the position of the wheel under test, preventing the wheel from coming off the slide plate 2. For example, in this embodiment, the surface of the slide plate 2 is covered with a friction substrate. The slide plate 2 and the friction substrate are connected by fasteners or glued together.

[0047] Furthermore, as a preferred embodiment, it also includes a wheel bracket 12. The wheel bracket 12 has a receiving hole for accommodating the wheel to be tested. One end of the receiving hole is open, and a rolling element is provided at the open end of the wheel bracket 12. The rolling element can slide and engage with the outer surface of the slide plate 2. The wheel bracket 12 is generally U-shaped, and the wheel to be tested can be installed in the receiving hole. Optionally, in this embodiment, the rolling element can be a bearing 13 or a roller, etc. The rolling element allows the wheel to be tested and the wheel bracket 12 to slide smoothly during sliding, eliminating the friction between the outer surface of the slide plate 2 and the wheel bracket 12, thus ensuring accurate measurement data. Several bushings are provided in the receiving hole of the wheel bracket 12 for installing the wheel to be tested, such as a first bushing 122 and a second bushing 123, and a third bushing 124 is provided in the fastening hole. The bushing design is merely illustrative and not intended to limit the present invention.

[0048] The wheel bracket 12 has fastening holes on its two opposite sides. Fasteners are inserted through these holes and the wheel under test to mount the wheel onto the wheel bracket 12. Optionally, the fasteners can be screws, bolts 14, or other structures. Screws and bolts 14 require the use of nuts 17, which will not be described in detail here.

[0049] The present invention provides a wheel sliding friction coefficient measuring device. When measuring the coefficient of friction, the base plate 1 is placed on a horizontal surface. First, the handwheel 11 is rotated counterclockwise in the first direction to adjust the angle between the slide plate 2 and the base plate 1 to the minimum. The wheel bracket 12 with the wheel to be tested is placed on the friction substrate, and the wheel to be tested is in direct contact with the friction substrate. Then, the handwheel 11 is rotated clockwise in the second direction. At this time, the angle between the friction substrate and the base plate 1 gradually increases, increasing the tilt of the slide plate 2. When the wheel bracket 12 starts to slide, the tilt angle θ (the acute angle between the slide plate 2 and the horizontal surface) can be obtained by measurement.

[0050] Frictional force F = P * f, where P is the normal force and f is the coefficient of sliding friction. When the wheel under test first begins to slide, the frictional force is equal to the sliding force T, where T = G * sinθ. The normal force P = G * cosθ. Therefore, the following derivations can be made: f = F / P, f = T / P, f = G * sinθ / (G * cosθ), and finally, f = tanθ. After obtaining the tilt angle θ, the value of tanθ can be calculated, and thus the coefficient of sliding friction f can be derived.

[0051] This invention provides a device for measuring the sliding friction coefficient of a wheel. The wheel to be tested is placed on a sliding plate 2, and the tilt angle of the sliding plate 2 is increased by operating a moving mechanism. The tilt angle θ at which the wheel begins to slide can be obtained, and then the value of tanθ can be obtained, which is the sliding friction coefficient between the wheel and the substrate. Compared with existing technologies, this device is simple, convenient, and effective. It does not require a traction device or a force measuring device, making the measurement operation simple, convenient, and accurate.

[0052] Furthermore, as a preferred embodiment, a scale line A is provided on the side of the mounting base parallel to the axial direction of the lead screw 8, and a marking line B is provided on the corresponding side of the slider 3.

[0053] The scale line A is formed by the value of tanθ.

[0054] Optionally, the scale line A is disposed on the outward-facing side of the first base plate 71 and / or the second base plate 72.

[0055] During measurement, the base plate 1 is placed on a horizontal surface. First, the handwheel 11 is rotated counterclockwise in the first direction to minimize the angle between the slide plate 2 and the base plate 1. The wheel bracket 12, which houses the wheel to be tested, is then placed on the friction substrate. Next, the handwheel 11 is rotated clockwise in the second direction, gradually increasing the angle between the friction substrate and the base plate 1, thus increasing the tilt of the slide plate 2. When the wheel bracket 12 begins to slide, the reading (tanθ value) of the scale line A on the mounting base corresponding to the mark line B on the slider 3 is directly read, which is the sliding friction coefficient f between the wheel to be tested and the friction substrate. Compared with existing technologies, this method is simple, convenient, and effective. It does not require a traction device or a force measuring device, making the measurement operation simple, convenient, and accurate.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for measuring the coefficient of sliding friction of a wheel, characterized in that, The utility model relates to a kind of movable mechanism for testing tire, including: Bottom plate, sliding seat, sliding plate, slider and moving mechanism; The sliding seat is arranged at one end of the bottom plate, the moving mechanism is arranged at the other end of the bottom plate, one end of the sliding plate is slidably arranged in the sliding seat, the other end of the sliding plate is hingedly connected with the slider, and the slider is sleeved on the moving mechanism. Wherein, the surface of the sliding plate is provided with a friction substrate, and the sliding plate is in an inclined state.

2. The wheel sliding friction coefficient measuring device according to claim 1, characterized in that, The sliding seat includes a vertical plate, a slide shaft sleeve, and a slide shaft. The vertical plate is mounted on the bottom plate, the slide shaft sleeve is mounted on the side of the vertical plate, the slide shaft is mounted in the slide shaft sleeve and can move in the slide shaft sleeve, the slide shaft has a mounting hole for mounting the sliding plate, the sliding plate is slidably arranged in the mounting hole, and the slide shaft sleeve has a clearance hole for the sliding plate.

3. The wheel sliding friction coefficient measurement device according to claim 1, characterized by The moving mechanism includes a mounting seat, a lead screw, and a lead screw nut. The mounting seat is arranged on the bottom plate, one end of the slider is slidably arranged in the mounting seat, the other end of the slider is sleeved on the lead screw, and the lead screw is sleeved with the lead screw nut.

4. The wheel sliding friction coefficient measuring device according to claim 3, characterized in that, The side of the mounting seat parallel to the axis direction of the lead screw is provided with a scale line, and the corresponding side of the slider is provided with a mark line.

5. The wheel sliding friction coefficient measurement device according to claim 4, characterized in that, The scale line is formed by the value of tanθ.

6. The wheel sliding friction coefficient measurement device according to claim 3, wherein The first support and the second support are respectively arranged at both ends of the mounting seat, and the first support and the second support are arranged on the bottom plate.

7. The wheel sliding friction coefficient measurement device of claim 3, wherein The mounting seat is provided with a T-shaped groove, and one end of the slider is slidably arranged in the T-shaped groove.

8. The wheel sliding friction coefficient measuring device according to any one of claims 1 to 7, characterized in that, The end of the sliding plate close to the slider is provided with a limiting plate.

9. The wheel sliding friction coefficient measuring device according to any one of claims 1 to 7, characterized in that, It also includes a wheel support, the wheel support is provided with a containing hole for accommodating the tire to be tested, one end of the containing hole is open, the open end of the wheel support is provided with a rolling element, and the rolling element can roll with the outer side of the sliding plate.

10. The wheel sliding friction coefficient measurement device according to claim 9, wherein Both opposite sides of the wheel support are provided with fastening holes, and a fastener is arranged in the fastening holes and the tire to be tested to mount the tire to be tested on the wheel support.

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