Wheel speed measuring device

Abstract

To accurately measure a wheel speed by a sensor ring without increasing the number of components.SOLUTION: In a saddle riding type vehicle, power is transmitted from a prime mover to a drive wheel via a pair of pulleys and a belt (35). The wheel speed measuring device (41) of the saddle riding type vehicle is provided with a sensor ring (42) in which a plurality of detected parts (44) are arranged in a circumferential direction, and a sensor (46) installed so as to face a part of the detected parts. A belt is hung on a pulley body (37) of one pulley (34), and a sensor ring is detachably attached to the pulley body as a fall-off prevention plate of the belt.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a wheel speed measurement device. [Background technology]

[0002] Conventionally, a known wheel speed measurement device for a saddle-ride type vehicle uses a sensor ring to measure wheel speed (see, for example, Patent Document 1). The sensor ring described in Patent Document 1 is screwed to the side of the brake disc of the rear wheel, and a sensor is installed so as to partially cover the sensor ring from the side. The sensor ring has multiple slits formed at equal intervals around its circumference, and as the sensor ring rotates together with the rear wheel, the slits pass inside the sensor. The sensor detects the passage of the slits, and the wheel speed of the rear wheel is measured from the number of slits that pass over the sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-103372 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the sensor ring described in Patent Document 1 increases the number of parts by being attached to the brake disc. If the brake disc itself is used as the sensor ring, frictional heat can cause deformation of the slit, resulting in a decrease in measurement accuracy.

[0005] The present invention has been made in view of the above points, and has as its object to provide a wheel speed measuring device that can measure wheel speeds with high accuracy using a sensor ring without increasing the number of parts. [Means for solving the problem]

[0006] One aspect of the wheel speed measuring device of the present invention is a wheel speed measuring device for a saddle-type vehicle in which power is transmitted from a prime mover to a drive wheel via a pair of pulleys and a belt, and is equipped with a sensor ring in which a plurality of detectable parts are arranged circumferentially, and sensors installed to face some of the detectable parts, with the belt hung on the pulley body of one of the pulleys, and the sensor ring removably attached to the pulley body as a plate to prevent the belt from falling off, thereby solving the above problem. [Effects of the Invention]

[0007] According to one aspect of the present invention, the pulley body and the sensor ring are formed as separate parts, so that multiple detection targets can be formed on the sensor ring with high precision. In addition, because the sensor ring also functions as a plate to prevent the belt from falling off, the sensor ring can be attached to the pulley without increasing the number of parts. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a left side view of the rear part of the vehicle according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the rear part of the vehicle in FIG. 1 taken along line AA. [Figure 3] FIG. 2 is a rear view of the rear part of the vehicle according to the first embodiment. [Figure 4] FIG. 10 is a left side view of the rear part of the vehicle according to the second embodiment. [Figure 5] 5 is a cross-sectional view of the rear part of the vehicle in FIG. 4 taken along line BB. [Figure 6] FIG. 10 is a left side view of the rear part of the vehicle of the third embodiment. [Figure 7] FIG. 7 is a cross-sectional view of the rear part of the vehicle in FIG. 6 taken along line CC. [Figure 8] FIG. 10 is a left side view of the rear part of the vehicle of the fourth embodiment.

[0009] In one aspect of the present invention, a saddle-type vehicle transmits power from a prime mover to a drive wheel via a pair of pulleys and a belt. The wheel speed measurement device for this saddle-type vehicle includes a sensor ring with multiple detection targets arranged circumferentially, and a sensor installed to face some of the detection targets. A belt is looped around the pulley body of one of the pulleys, and the sensor ring is detachably attached to the pulley body as a plate to prevent the belt from falling off. Because the pulley body and the sensor ring are formed as separate parts, the multiple detection targets can be formed on the sensor ring with high precision. Furthermore, because the sensor ring also functions as a plate to prevent the belt from falling off, the sensor ring can be attached to the pulley without increasing the number of parts. [Example]

[0010] <First Example> A saddle-type vehicle equipped with a wheel speed measuring device of the first embodiment will now be described with reference to the accompanying drawings, in which: Figure 1 is a left side view of the rear part of the vehicle of the first embodiment;

[0011] As shown in Figure 1, a pivot bracket 12 is provided on a body frame 11 of a vehicle body frame 10. A swing arm 14 is swingably supported on the pivot bracket 12 via a pivot shaft 13. The swing arm 14 extends rearward from the pivot shaft 13, and a rear wheel (drive wheel) 22 is rotatably supported at the rear end of the swing arm 14 via an axle shaft 21. The rear wheel 22 is formed by mounting a tire 24 on the outer circumferential surface of a wheel 23. A cast wheel in which the rim, hub, and spokes are molded as a single unit is used for the wheel 23.

[0012] A prime mover 31 that generates driving force is installed in front of the body frame 11. A drive pulley 33 is provided on an output shaft 32 of the prime mover 31, and a driven pulley (one of the pulleys) 34 is provided on the wheel 23 of the rear wheel 22. A belt 35 is stretched between the drive pulley 33 and the driven pulley 34, and power is transmitted from the prime mover 31 to the rear wheel 22 via the drive pulley 33, the driven pulley 34, and the belt 35. In addition, a side stand 15 is connected to the lower part of the pivot bracket 12, and the side stand 15 allows the vehicle body to tilt to the left (one side in the vehicle width direction) and stand on its own.

[0013] Meanwhile, straddle-type vehicles are equipped with a wheel speed measurement device that measures the wheel speed of the rear wheels. The sensor ring of the wheel speed measurement device is often attached to the wheel or brake disc. When attaching the sensor ring to the wheel, a separate part is required to attach the sensor ring to the wheel in order to ensure the sensing pitch diameter. This increases the weight of the wheel, which may worsen handling stability.

[0014] Because the sensor ring is made of a magnetic material and requires high processing precision, it must be manufactured as a separate part from the cast aluminum wheel using press processing or other methods.

[0015] It is also possible to mold the sensor ring and disc brake as a single unit. The sensor ring has multiple slits, but if the sensor ring functions as a brake disc, the slits may be affected by frictional heat, which could degrade detection accuracy. A flange-shaped anti-slip plate is usually attached to the pulley to prevent the belt from falling off. Therefore, the wheel speed measurement device 41 of this embodiment uses a sensor ring 42 instead of an anti-slip plate, enabling accurate measurement of wheel speed while minimizing the number of parts.

[0016] The wheel speed measurement device will be described with reference to Figures 2 and 3. Figure 2 is a cross-sectional view of the rear part of the vehicle taken along line AA in Figure 1. Figure 3 is a rear view of the rear part of the vehicle according to the first embodiment.

[0017] As shown in Figure 2, a driven pulley 34 is detachably attached with a bolt 36 to the left side surface (one side surface in the vehicle width direction) of the wheel 23 of the rear wheel 22. A pulley body 37 of the driven pulley 34 is formed in a ring shape. A belt 35 is looped around a meshing surface 38 on the outer periphery of the pulley body 37, and a flange 39 projects radially outward from the side edge of the meshing surface 38 on the inner side in the vehicle width direction. Because the flange 39 extends along the right side surface of the belt 35, the flange 39 prevents the belt 35 from falling off the meshing surface 38 toward the inner side in the vehicle width direction.

[0018] A sensor ring 42 is detachably attached to the left side surface (one side surface in the vehicle width direction) of the pulley body 37 with a bolt 43. The sensor ring 42 protrudes radially outward from the meshing surface 38, and faces the flange 39 in the vehicle width direction. Because the sensor ring 42 extends along the left side surface of the belt 35, the sensor ring 42 prevents the belt 35 from falling off from the meshing surface 38 outward in the vehicle width direction. The sensor ring 42 has multiple slits (detectable portions) 44 that are long in the radial direction. The multiple slits 44 are arranged at equal intervals around the circumference of the sensor ring 42.

[0019] An axle shaft 21 is rotatably supported on a hub 25 of the wheel 23 via a pair of bearings 26. A swing arm 14 is connected to the left end (one end in the vehicle width direction) of the axle shaft 21 via an axle spacer 27. A sensor 46 is supported on the swing arm 14 via a bracket 45, and is installed so as to face a slit 44 in a part of the sensor ring 42. The sensor 46 partially covers the sensor ring 42 from the outer side in the vehicle width direction (see Figure 1), and the sensor ring 42 is positioned in a detection area that is on the inner side of the sensor 46 in the vehicle width direction.

[0020] As the sensor ring 42 rotates together with the rear wheel 22, the slits 44 of the sensor ring 42 pass through the detection area of ​​the sensor 46. The sensor 46 is a magnetic sensor, and the sensor ring 42 is made of a magnetic material. Each time the sensor ring 42 rotates and the slits 44 pass inside the sensor 46, the magnetic field changes. The sensor 46 detects the change in the magnetic field and outputs it as a pulse signal to a measuring device (not shown), which then measures the wheel speed of the rear wheel 22 based on the pulse signal. The wheel 23 and pulley body 37 are made of a non-magnetic material such as aluminum, and do not affect the detection accuracy of the sensor 46.

[0021] As shown in Figure 3, the side stand 15 is provided on the left side (one side in the vehicle width direction) of the body frame 11. As described above, the sensor ring 42 is located on the left side of the pulley body 37, and is positioned closer to the side stand 15 than the center C in the vehicle width direction. When parking, the vehicle body is tilted to the left by the side stand 15, so that the sensor ring 42 on the underside of the vehicle body is hidden by the vehicle body, improving the appearance.

[0022] As described above, according to the wheel speed measurement device 41 of the first embodiment, the pulley body 37 and the sensor ring 42 are formed as separate parts, so it is possible to form the multiple slits 44 with high precision in the sensor ring 42. Furthermore, because the sensor ring 42 also functions as a plate to prevent the belt 35 from falling off, it is possible to provide the sensor ring 42 on the driven pulley 34 without increasing the number of parts.

[0023] Furthermore, since the sensor ring 42 is attached to a part different from the brake disc, it is not subjected to the frictional heat of the brake disc, and the shape of the slit in the sensor ring is less likely to deform, enabling highly accurate measurements.

[0024] <Second Example> Next, a wheel speed measurement device of a second embodiment will be described with reference to Figures 4 and 5. The wheel speed measurement device of the second embodiment differs from the wheel speed measurement device of the first embodiment in the mounting position of the sensor and the formation position of the slit. Therefore, a description of the second embodiment that is similar to the first embodiment will be omitted as much as possible. Figure 4 is a left side view of the rear part of the vehicle of the second embodiment. Figure 5 is a cross-sectional view of the rear part of the vehicle of Figure 4 taken along line BB.

[0025] As shown in Figures 4 and 5, a driven pulley 61 is detachably attached to the left side surface (one side surface in the vehicle width direction) of the wheel 54 of the rear wheel 53 with a bolt 63. The driven pulley 64 has a body made of a magnetic material. A belt 62 is hung on a meshing surface 65 of the pulley body 64, and a flange 66 protrudes radially outward from the inner side edge of the meshing surface 65 in the vehicle width direction. A sensor ring 72 is detachably attached to the left side surface (one side surface in the vehicle width direction) of the pulley body 64 with a bolt 73. The sensor ring 72 protrudes radially outward from the meshing surface 65, and faces the flange 66 in the vehicle width direction. A slit 74 is formed in the sensor ring 72.

[0026] The pulley body 64 is formed of a magnetic material, just like the sensor ring 72. For this reason, the slits 74 are offset radially inward with respect to the contact surface 75 between the sensor ring 72 and the pulley body 64. The slits 74 do not overlap the pulley body 64 in the vehicle width direction, and even though the pulley body 64 is formed of a magnetic material, the effect on the detection accuracy of the sensor 77 is suppressed. Note that, as long as the sensor 77 can detect passage through the slits 74, the slits 74 may be offset radially outward with respect to the contact surface 75 between the sensor ring 72 and the pulley body 64.

[0027] An axle shaft 52 is rotatably supported on a hub 55 of the wheel 54 via a pair of bearings 56. A swing arm 51 is connected to the left end (one end in the vehicle width direction) of the axle shaft 52 via an axle spacer 57. A support arm 76 extends radially outward from the axle spacer 57, and a sensor 77 is supported on the tip of the support arm 76. The sensor 77 faces a slit 74 in a part of the sensor ring 72, and as the sensor ring 72 rotates together with the rear wheel 53, a change in the magnetic field is detected by the sensor 77, and the wheel speed of the rear wheel 53 is measured by a measuring instrument.

[0028] As described above, in the wheel speed measurement device 71 of the second embodiment, the slits 74 can be formed in the sensor ring 72 with high precision, and the sensor ring 72 can be provided without increasing the number of parts.

[0029] <Third Example> Next, a wheel speed measurement device of a third embodiment will be described with reference to Figs. 6 and 7. The wheel speed measurement device of the third embodiment differs from the wheel speed measurement device of the first embodiment in the mounting position of the sensor ring. Therefore, a description of the same configuration as in the first embodiment will be omitted as much as possible. Fig. 6 is a left side view of the rear of the vehicle of the third embodiment. Fig. 7 is a cross-sectional view of the rear of the vehicle of Fig. 6 taken along line CC.

[0030] As shown in Figures 4 and 5, a driven pulley 91 is detachably attached with a bolt 93 to the left side surface (one side surface in the vehicle width direction) of the wheel 84 of the rear wheel 83. A belt 92 is looped around a meshing surface 95 of a pulley body 94, and a flange 96 protrudes radially outward from the outer side edge of the meshing surface 95 in the vehicle width direction. A sensor ring 102 is detachably attached with a bolt (not shown) to the right side surface (the other side surface in the vehicle width direction) of the pulley body 94. The sensor ring 102 protrudes radially outward from the meshing surface 95, and faces the flange 96 in the vehicle width direction. A plurality of slits 104 are formed in the sensor ring 102.

[0031] An axle shaft 82 is rotatably supported on a hub 85 of the wheel 84 via a pair of bearings 86. A swing arm 81 is connected to the left end (one end in the vehicle width direction) of the axle shaft 82 via an axle spacer 87. A bracket 105 extends from the swing arm 81 toward the inside in the vehicle width direction, and a sensor 106 is supported at the tip of the bracket 105. The sensor 106 faces a slit 104 that is part of the sensor ring 102 from the inside in the vehicle width direction, and as the sensor ring 102 rotates together with the rear wheel 83, a change in the magnetic field is detected by the sensor 106 and the wheel speed of the rear wheel 83 is measured by a measuring instrument.

[0032] As described above, in the wheel speed measurement device 101 of the third embodiment, the plurality of slits 104 can be formed in the sensor ring 102 with high precision, and the sensor ring 102 can be provided without increasing the number of parts. When assembling the driven pulley 91 of the third embodiment, the sensor ring 102 is attached to the pulley body 94, and then the pulley body 94 is attached to the wheel 84.

[0033] <Fourth Example> Next, a wheel speed measurement device of a fourth embodiment will be described with reference to Fig. 8. The wheel speed measurement device of the fourth embodiment differs from the wheel speed measurement device of the first embodiment in that the wheel speed is measured by a drive pulley. Therefore, a description of the same configuration as in the first embodiment will be omitted as much as possible. Fig. 8 is a left side view of the rear part of a vehicle of the fourth embodiment.

[0034] As shown in Figure 8, a drive pulley 114 is attached to the output shaft 113 of the motor 112. A belt 117 is looped around the meshing surface (not shown) of a pulley body 115, and a sensor ring 122 is detachably attached to the pulley body 115. A plurality of slits 124 are formed in the sensor ring 122, and a sensor 125 is attached to the motor 112. The sensor 125 faces some of the slits 124 of the sensor ring 122 from the inside in the vehicle width direction, and as the sensor ring 122 rotates together with the output shaft 113, a change in the magnetic field is detected by the sensor 125, and the wheel speed of the rear wheel 111 is measured by a measuring instrument.

[0035] As described above, in the wheel speed measurement device 121 of the fourth embodiment, the plurality of slits 124 can be formed in the sensor ring 122 with high precision, and the sensor ring 122 can be provided without increasing the number of parts.

[0036] In the first to third embodiments, the swing arm is made of steel pipe or steel plate, and the sensor is attached to the swing arm via a bracket or support arm. However, in the case of an aluminum cast swing arm, a mounting seat may be formed in the swing arm, and the sensor may be installed directly on the swing arm.

[0037] Furthermore, in each embodiment, the side stand and the pulley are provided on the left side of the vehicle body, but the side stand and the pulley may be provided on the right side of the vehicle body.

[0038] Furthermore, in each embodiment, an example in which the sensor is a magnetic sensor has been given, but the sensor may be an optical sensor.

[0039] In each embodiment, a slit is formed in the sensor ring as a detected portion, but the detected portion is not limited to a slit as long as it is formed so as to be detectable by the sensor.

[0040] The wheel speed measuring device of this embodiment is not limited to the saddle-ride type vehicle described above, and may be used in other types of saddle-ride type vehicles. Note that the saddle-ride type vehicle is not limited to all vehicles in which the rider sits astride the seat, but also includes scooter-type vehicles in which the rider does not sit astride the seat.

[0041] As described above, the first aspect is a wheel speed measuring device (41, 71, 101, 121) for a saddle-type vehicle in which power is transmitted from a prime mover (31, 112) to a drive wheel (rear wheel 22, 53, 83, 111) via a pair of pulleys (33, 34) and a belt (35, 62, 92, 117), and is provided with a sensor ring (42, 72, 102, 122) having a plurality of detectable portions (slits 44, 74, 104, 124) arranged circumferentially, and sensors (46, 77, 106, 125) installed opposite some of the detectable portions, and a belt is hung on the pulley body (37, 64, 94) of one of the pulleys (driven pulley 34, 61, 91, drive pulley 114), and the sensor ring is removably attached to the pulley body as a plate to prevent the belt from falling off. With this configuration, the pulley body and the sensor ring are formed as separate parts, so multiple detection points can be formed on the sensor ring with high precision.In addition, because the sensor ring also functions as a plate to prevent the belt from falling off, the sensor ring can be attached to the pulley without increasing the number of parts.

[0042] In the second aspect, the saddle-type vehicle in the first aspect is supported by a side stand (15) with the body tilted to one side in the vehicle width direction, and the sensor ring is positioned closer to the side stand than the center in the vehicle width direction. With this configuration, the sensor ring is hidden by the body when the body is tilted by the side stand, improving the appearance.

[0043] In a third aspect, in the first or second aspect, the plurality of detection targets are offset in the radial direction from the contact surface between the sensor ring and the pulley body. With this configuration, the detection targets do not overlap with the pulley body in the vehicle width direction, and even if the pulley body is made of a magnetic material, the effect on the detection accuracy of the sensor is suppressed.

[0044] Although the present embodiment has been described, other embodiments may be made by combining the above-described embodiments and modifications in whole or in part.

[0045] Furthermore, the technology of the present invention is not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0046] 15: Side stand 22, 53, 83, 111: Rear wheel (rear wheel) 31, 112: Prime mover 34, 61, 91: Driven pulley (one of the pulleys) 35, 62, 92, 117: Belt 37, 64, 94, 115: Pulley body 41, 71, 101, 121: Wheel speed measuring device 42, 72, 102, 122: Sensor Ring 44, 74, 104, 124: Slits (detection area) 46, 77, 106, 125: Sensor 75: Contact surface 114: Drive pulley (one of the pulleys)

Claims

1. A wheel speed measurement device for a saddle-ride type vehicle in which power is transmitted from a prime mover to a drive wheel via a pair of pulleys and a belt, comprising: a sensor ring having a plurality of detection targets arranged in a circumferential direction; a sensor disposed so as to face a part of the detection target portion, A wheel speed measuring device characterized in that the belt is hung on the pulley body of one of the pulleys, and the sensor ring is detachably attached to the pulley body as a plate to prevent the belt from falling off.

2. the saddle-type vehicle is supported by a side stand with the vehicle body tilted to one side in the vehicle width direction, 2. The wheel speed measuring device according to claim 1, wherein the sensor ring is positioned closer to the side stand than the center of the vehicle in the width direction.

3. 3. The wheel speed measuring device according to claim 1, wherein the detection target portion is offset in a radial direction from a contact surface between the sensor ring and the pulley body.

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