Round motorcycle instrument

Abstract

The utility model discloses a circular motorcycle instrument, which realizes the design and installation of an instrument which is simple and reliable in installation and connection structure, convenient to maintain and install, firm and durable through an instrument upper shell, an instrument middle sleeve and an instrument bottom shell. The input high voltage is reduced to the voltage which can be normally operated by the electronic device and the circuit board through the main power supply circuit, and the input and output voltages are subjected to filtering and noise reduction for many times, so that the working stability of the instrument is ensured, the stability and the reliability of the display of the instrument icon on the instrument are further ensured, and the practicability is high. The use experience of a user is improved, and the display quality of the instrument is ensured.

Description

Technical Field

[0001] The utility model relates to the field of motorcycle instruments, and particularly relates to a circular motorcycle instrument with LED display. Background Art

[0002] The development history of motorcycle instruments is relatively long, and they have increasingly become necessities on motorcycles. Instruments not only play a role in displaying motorcycle vehicle information on motorcycles but also gradually become decorations on motorcycles. Therefore, although the method of displaying information on the circular motorcycle instrument by LED flashing is relatively outdated, the circular motorcycle instrument belongs to the classic style of motorcycle instruments, so there are still quite a few audiences.

[0003] However, currently, whether motorcycle instruments are circular or of other shapes, their installation structures are simple. The housing structure only has upper and lower layers, and it can be fixed by the upper housing and the lower housing. This simple fixed connection method has little impact on the use of mechanical instruments. However, for electronic instrument panels with LEDs and circuits inside, their waterproof performance is poor, and the requirement for the waterproof performance of internal components is high.

[0004] For example, in the "A Motorcycle Combined Instrument" with the publication number CN201559752U, its outer shell consists of upper and lower layers, and the connection part relies on bolt connection with poor waterproof ability. Because the two layers need to be fixed tightly, more bolts are required for connection, and the instrument assembly speed is also slower. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a circular motorcycle instrument. The circular motorcycle instrument divides the housing of the motorcycle instrument into upper, middle, and lower parts, and both the upper and lower parts are connected to the middle part. The installation is convenient, the number of connectors required is small, but the connection is more firm, and the contact area between the housings is larger, so the waterproof performance is more excellent. The internal circuit can be designed more complex without worrying about waterproof problems, and more LEDs can be powered, so as to support more information to be displayed on the instrument. A further object of the utility model is to design a main power supply circuit, which can supply power to the instrument indicator lights, sensor components, and main processor more stably, and ensure the normal operation of the instrument functions.

[0006] The utility model realizes the above technical purposes through the following technical means.

[0007] A circular motorcycle instrument includes a circuit board. A stepped upper housing clamping platform is provided on the bottom wall of the upper housing of the circular motorcycle instrument. An instrument middle sleeve is provided below the upper housing of the instrument. A clamping groove is provided on the outer wall of the instrument middle sleeve. An instrument bottom shell is provided below the instrument middle sleeve. A stepped bottom shell clamping platform is provided on the top wall of the instrument bottom shell.

[0008] The upper shell clamping platform is embedded in the upper slot of the clamping slot, and the bottom shell clamping platform is embedded in the lower slot of the clamping slot.

[0009] Further, an instrument upper cover is also provided between the instrument upper shell and the instrument middle sleeve. The instrument upper cover covers above the instrument panel with an instrument color film disc attached, the circuit board is located below the instrument panel, and the panel mounting posts on the instrument panel pass through the circuit board and are mounted on the panel mounting seats of the instrument middle sleeve.

[0010] Further, the circuit board is divided into upper and lower layers. The upper-layer circuit board is attached to the bottom surface of the instrument panel, and the lower-layer circuit board is attached to the end surface at the top of the panel mounting seat.

[0011] Further, an instrument cover pressing platform is provided on the instrument upper shell in a ring shape and inward and downward. The lower end surface of the instrument cover pressing platform is attached to the upper surface of the instrument upper cover. The edge of the instrument upper cover extends downward to form an upper cover insertion plate. The upper half of the instrument middle sleeve is covered inside the upper cover insertion plate, and the lower end surface of the upper cover insertion plate is located at the inner upper end surface of the clamping slot.

[0012] Further, a buckle is provided on the instrument upper shell, and a protruding buckle platform is provided below the clamping slot of the instrument middle sleeve. An empty hole is provided in the clamping slot above the buckle platform, and the arc length of the empty hole is greater than the arc length of the buckle.

[0013] Further, a ring-shaped platform is provided in the middle of the instrument bottom shell, and a plurality of base mounting holes are provided on the ring-shaped platform. Middle sleeve mounting posts matching the base mounting holes are provided at the bottom of the instrument middle sleeve.

[0014] Further, buckle embedding grooves are provided at intervals on the inner wall of the upper part of the instrument bottom shell and cooperate with the buckles.

[0015] Further, a main power supply circuit is provided on the circuit board. The main power supply circuit is a step-down circuit and is connected to the sensor circuit and the central processor circuit.

[0016] Further, in the main power supply circuit, the filtering and voltage stabilizing partial circuit is connected to the input voltage IGN. The output end of the filtering and voltage stabilizing circuit leads to the input end of the DCDC step-down chip, and the DCDC step-down chip outputs 5V voltage to lead to the central processor circuit.

[0017] Further, the input voltage IGN of the filtering and voltage stabilizing circuit is connected to the P pole of the diode 3D1. The N pole of the diode 3D1 is connected in parallel with the positive pole of the polarized capacitor 3C10, one end of the capacitor 3C0, one end of the resistor 3R3, the emitter of the triode 3Q1, the N pole of the voltage stabilizing diode 3ZD2, one end of the resistor 3R4, and the drain of the PMOS transistor 3Q2. The negative pole of the capacitor 3C10, the other end of the capacitor 3C0, the P pole of the voltage stabilizing diode 3ZD1, and one end of the resistor 3R5 are connected in parallel.

[0018] The utility model has the following beneficial effects:

[0019] The circular motorcycle instrument is formed by snapping the instrument upper shell onto the upper half of the instrument middle sleeve, and the instrument bottom shell is sleeved on the lower part of the instrument middle sleeve. The electronic components are located in the cavity formed by the instrument upper shell and the middle sleeve. There is a surface contact between the instrument upper shell and the middle sleeve, which can ensure good waterproof performance. The snap - fit part of the upper shell and the middle sleeve is embedded in the wall of the instrument bottom shell, increasing the contact area among the three, making the connection more firm. Finally, the middle sleeve and the bottom shell are fixed with fewer fixing parts. Because there are fewer connecting parts, the assembly speed of the instrument is fast and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the assembly sectional view of the utility model.

[0021] Figure 2 is the exploded sectional view of the utility model.

[0022] Figure 3 is the exploded three - dimensional view of the utility model.

[0023] Figure 4 is the connection schematic diagram of the main power supply circuit of the utility model.

[0024] In the figure, 1 - instrument upper shell, 11 - instrument cover pressing platform, 12 - upper shell clamping platform, 13 - buckle; 2 - instrument upper cover, 21 - upper cover insertion plate; 3 - instrument color film disk; 4 - instrument dial, 41 - dial mounting post, 42 - dial clamping platform; 5 - circuit board; 6 - instrument middle sleeve, 61 - card slot, 62 - middle sleeve mounting post, 63 - dial mounting seat, 64 - mounting board clamping platform, 65 - middle sleeve threaded sleeve, 66 - middle sleeve wall, 67 - buckle platform, 68 - buckle groove; 7 - instrument mounting board, 71 - mounting board card hole, 72 - mounting board positioning hole; 8 - instrument bottom shell, 81 - bottom shell clamping platform, 82 - buckle embedding groove, 83 - bottom shell mounting seat; 9 - rubber sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the utility model in conjunction with the drawings and specific embodiments, but the protection scope of the utility model is not limited thereto.

[0026] Embodiment 1:

[0027] As shown in Figures 1 to 3 Figure, a circular motorcycle instrument, the components of the circular motorcycle instrument from top to bottom are an instrument upper shell 1, an instrument upper cover 2, an instrument color film disk 3, an instrument dial 4, a circuit board 5, an instrument middle sleeve 6, an instrument mounting plate 7, an instrument bottom shell 8, and a rubber sleeve 9.

[0028] Among them, the components that are part of the outer shell and have a connection and assembly relationship are the instrument upper shell 1, the instrument middle sleeve 6, and the instrument bottom shell 8. In the chamber formed by the combination of the instrument upper shell 1 and the instrument middle sleeve 6, the instrument upper cover 2, the instrument color film disk 3, the instrument dial 4, and the circuit board 5 are installed.

[0029] The instrument upper shell 1 is a circular cylindrical body, and its upper part extends obliquely inward and downward with an instrument cover pressing platform 11, and the bottom of the end of the pressing platform is flat. The bottom of the instrument upper shell 1 is provided with a stepped upper shell clamping platform 12, and the stepped upper shell clamping platform 12 is short on the outside and long on the inside. The instrument upper shell 1 completely wraps the instrument upper cover 2 inside and covers the instrument upper cover 2. The instrument upper cover 2 is a disk, and the disk wall of the instrument upper cover 2 expands slightly outward. Among them, the installation height of the bottom of the upper cover insertion plate 21 is greater than the installation height of the outer higher step of the stepped upper shell clamping platform 12 of the instrument upper shell 1.

[0030] The fitting between the instrument upper cover 2 and the instrument middle sleeve 6 forms a chamber for placing the instrument display components and control components of the present invention, and the housing formed between the instrument upper cover 2 and the instrument middle sleeve 6 is the inner shell of the present invention. The instrument upper shell 1 and the instrument bottom shell 8 cooperate with the instrument middle sleeve 6 to form the housing of the present invention as the outer shell. By designing the inner and outer two-layer housings, the waterproof performance of the instrument upper cover 2 can be effectively improved, and the important instrument components such as the internal display components and the control component circuit board can be more effectively protected when riding in bad weather conditions such as rainy days.

[0031] In the chamber, it can be seen that the instrument color film disk 3 is attached above the instrument dial 4. According to the information that the instrument needs to display on the instrument dial 4 and the arrangement of the LED lights on the circuit board, holes and slots are made on the dial to transmit the light emitted by the LED lights on the circuit board. At the same time, it is ensured that each opening position on the instrument dial 4 corresponds to only one LED light for flashing display, avoiding the problem that the light between the LED lights colludes and causes the display to be blurred and the light colors on the instrument dial 4 are mixed and difficult to distinguish.

[0032] Since the thickness of the instrument panel 4 is relatively thick and there is a large amount of instrument information displayed on the instrument panel 4, it is costly to engrave or process holes for the corresponding instrument information on the instrument panel 4, which is not conducive to mass production and requires corresponding molds. Moreover, it is difficult to achieve a high yield rate of the product when the production batch is small, and the cost of the product will remain at a high level when the production batch reaches a certain level. Because the market for motorcycle instruments itself is not large, it is a better choice to directly process through holes at the corresponding display positions on the instrument panel 4.

[0033] Moreover, when directly processing holes for the corresponding patterns on the instrument panel 4, the light emitted by the LEDs on the lower circuit board will directly shine out through the holes on the instrument panel 4. The holes on the instrument panel 4 itself play a certain role in converging the light emitted by the LEDs, making the light emitted by the instrument too concentrated and not divergent enough. When viewing the instrument information on the instrument panel 4 from a certain angle, it will be difficult to see some of the instrument information clearly.

[0034] Therefore, a better method is to attach an instrument color film disk 3 to the upper surface of the instrument panel 4, and draw the instrument patterns at the corresponding positions on the instrument panel 4 on the film of the instrument color film disk 3. The instrument color film disk 3 can diverge and transmit the light emitted from the bottom of the instrument panel 4, weakening the unidirectionality of the light transmitted from the instrument panel 4. This makes the light emitted from each information position on the instrument more uniform, and users can more easily see the information on the instrument panel 4 when riding.

[0035] Moreover, processing patterns on the film is significantly less costly than processing holes of corresponding shapes on a relatively thick disk surface, and the product qualification rate is higher, making it more suitable for small-batch production. The patterns on the instrument color film disk 3 are also easier to change. The instrument information display on the instrument color film disk 3 is also softer and more reasonable.

[0036] Four symmetric installation columns, namely the panel installation columns 41, are correspondingly provided below the instrument panel 4. The panel installation columns 41 are in a stepped shape. The diameter of the upper part of the panel installation column 41 is larger, and the diameter of the lower part of the panel installation column 41 is smaller. A threaded hole is provided at the center position of the panel installation column 41 for fixing the instrument panel 4 after installation.

[0037] The upper end of the instrument panel 4 is a panel clamping platform 42. The panel clamping platform 42 is a convex platform extending outward from the instrument panel 4, which is clamped on the top end face of the middle sleeve wall 66.

[0038] A double-layer circuit board 5 is provided below the instrument panel 4, wherein the upper layer of the circuit board 5 has an area similar to that of the bottom of the instrument panel 4, and a plurality of LED lights are welded on the upper layer of the circuit board 5, and their arrangement coincides with the openings on the instrument panel 4. A hole matching the upper diameter of the panel mounting column 41 is also provided on the circuit board 5 at a corresponding position on the instrument panel 4, which is used to pass through the panel mounting column 41, so that the instrument panel 4 can be mounted on the panel mounting seat 63 of the instrument middle sleeve 6. The circuit board 5 can also be fixed by the panel mounting column 41.

[0039] The lower layer of the circuit board 5 is placed on the top of the panel mounting seat 63 of the instrument housing 6. The panel mounting seat 63 is a truncated cone, and the diameter of the upper surface is smaller than the diameter of the lower surface. A through hole is provided at the center of the panel mounting seat 63, which coincides with the center of the threaded hole of the panel mounting column 41, and is used for positioning, installing and fixing the instrument panel in the instrument housing 6.

[0040] Below the circuit board 5 is the instrument middle sleeve 6, which is a deep disc-shaped structure as a whole, and is provided with four disc mounting seats 63 corresponding to the disc mounting columns 41. A hexagonal hole for mounting the middle sleeve threaded sleeve 65 is provided in the middle position, which runs through the upper and lower ends, and the instrument mounting plate 7 can be fixedly mounted on the bottom of the instrument middle sleeve with the middle sleeve threaded sleeve 65.

[0041] The bottom of the instrument sleeve 6 is close to the outer wall of the instrument sleeve 6, and three sleeve mounting posts 62 are evenly distributed. The sides of the sleeve mounting posts 62 are provided with reinforcing ribs, which also have a certain limiting effect, and are used to assist the fixing and mounting of the instrument sleeve 6 on the instrument bottom shell 8.

[0042] A downwardly protruding hollow step platform is provided near the middle part of the lower part of the instrument middle sleeve 6, which is the mounting board clamping platform 64. The size of the mounting board clamping platform 64 is smaller than the size of the rectangular hole mounting board clamping hole 71 at the corresponding position of the instrument mounting plate 7. The mounting board clamping platform 64 can be inserted into the mounting board clamping hole 71 of the instrument mounting plate 7.

[0043] The outer wall of the instrument sleeve 6 is higher, and the outer wall of the upper part thereof is thinner than the outer wall of the lower part. A clamping groove 61 is provided in an annular shape outward near the middle of the outer wall of the instrument sleeve 6. The cross section of the clamping groove 61 is an I-shaped. The outer side of the clamping groove 61 is an annular vertical plate, and the middle is an annular circular plate. The inner diameter of the circular plate is integrated with the outer wall of the instrument sleeve 6. Therefore, two upper and lower grooves are formed between the vertical plate of the clamping groove 61 and the outer wall of the instrument sleeve 6. The upper and lower grooves are separated by the annular circular plate. The outer wall of the instrument sleeve 6 at the position of the clamping groove 61 forms a step. The outer wall of the instrument sleeve 6 above the step is thinner, and the outer wall of the instrument sleeve 6 below the step is thicker.

[0044] At the bottom of the outer wall of the instrument upper cover 1, buckles 13 are regularly provided. On the outer wall of the instrument middle sleeve 6, correspondingly, buckle platforms 67 that can be fitted and engaged with the buckles 13 are also regularly distributed. The cross-sectional shape of the buckle platform 67 is trapezoidal. When the buckle platform 67 is fitted and installed with the buckle 13, the inclined surface side of the buckle platform 67 faces upward. This is beneficial to the buckling and locking of the buckle 13 and the buckle platform 67 during installation. The bottom surface of the buckle platform 67 is a flat surface, aiming to make it more difficult for the buckle 13 to fall off and be removed after being engaged with the buckle platform 67, improving the tightness of installation and avoiding the detachment of the buckle 13.

[0045] The buckle platform 67 is located below the card slot 61. Therefore, an empty hole is opened at the card slot 61 above the buckle platform 67. The size of the opening is similar to the size of the buckle 13 and slightly larger than the size of the buckle 13. Without restricting the engagement of the buckle 13 and the buckle platform 67 and the deformation of the buckle 13, the opening area at the corresponding position of the card slot 61 is ensured to be as small as possible, ensuring the structural strength of the card slot 61 and ensuring that the card slot 61 is not easily damaged or even broken during normal operation. The empty hole also embeds a part of the outer wall of the instrument middle sleeve 6.

[0046] The upper shell card platform 12 of the instrument upper shell 1 is stuck at the stepped position formed between the vertical plate and the upper slot of the card slot 61, and the upper cover insertion plate 21 of the instrument upper cover 2 is stuck on the step of the outer wall of the instrument middle sleeve 6 at the position of the card slot 61. Thus, the instrument upper shell 1 plays a role in covering the instrument upper cover 2. The bottom shell card platform 81 of the instrument bottom shell 8 is stuck at the stepped position formed between the vertical plate and the lower slot of the card slot 61.

[0047] Below the instrument middle sleeve 6 is the instrument mounting plate 7. The head of the instrument mounting plate 7 is located inside the chamber formed by the instrument middle sleeve 6 and the instrument bottom shell 8. The plate surface of the instrument mounting plate 7 is in a herringbone shape. And there is an angle between the head and the lower part of the instrument mounting plate 7, and the angle is an obtuse angle.

[0048] The width of the neck of the instrument mounting plate 7 is smaller than the width of the head of the instrument mounting plate 7, and the width of the body part of the instrument mounting plate 7 located outside is significantly larger than the head and the neck of the instrument mounting plate 7. Two support feet extend outward from the body part of the instrument mounting plate 7. Fixed mounting holes are provided at the ends of the two support feet to fix the instrument mounting plate 7 on the motorcycle. There is an arc-shaped transition section between the two support feet, connecting the two support feet. The two support feet symmetrically protrude inward with a toe part of the support feet, and a positioning mounting hole with a diameter smaller than the fixed mounting hole at the end of the support feet is provided on the toe part, which plays a role in positioning the installation of the instrument mounting plate on the motorcycle.

[0049] Along the extending direction of the two support feet, a section of groove is provided on both support feet, which reduces the weight of the instrument mounting plate 7 to a certain extent while not affecting the service strength and structural strength of the instrument mounting plate 7.

[0050] On both sides of the head of the instrument mounting plate 7, semicircular ear parts protrude, and the two ear parts are axially symmetric. Mounting plate positioning holes 72 are symmetrically provided on both ear parts. The mounting plate positioning holes 72 can be correspondingly matched with the threaded holes on the two middle sleeve threaded sleeves 65 on the instrument middle sleeve 6, and the instrument mounting plate 7 can be mounted on the instrument middle sleeve through bolts.

[0051] An instrument bottom shell 8 is provided below the instrument mounting plate 7. At the same time, the instrument bottom shell 8 is the bottommost structure of the entire instrument. The upper part of the instrument bottom shell 8 presents as a thin-shell cylindrical part, and its lower part generally presents as a thin-shell stepped frustum. An inwardly convex bottom shell mounting seat 83 is provided on the middle platform part of the frustum. The middle hole of the bottom shell mounting seat 83 is in a gourd shape, with large openings at both ends and a thin neck in the middle. The upper part of the hole of the bottom shell mounting seat 83 is used for socketing the middle sleeve mounting post 62.

[0052] On the inner wall of the upper part of the instrument bottom shell 8 that presents as a thin-shell cylindrical part, snap-in grooves 82 are regularly provided. The distribution pattern of the snap-in grooves 82 is the same as that of the snaps 13. When the instrument upper shell 1 is snapped onto the instrument middle sleeve 6, the snap-in grooves 82 can insert the instrument middle sleeve 6 into the instrument bottom shell 8, and the snaps 13 and snap platforms 67 are inserted into the snap-in grooves 82.

[0053] The mounting plate snap platform 64 protruding downward from the middle part of the instrument middle sleeve 6 is sleeved inside a stepped rectangular columnar rubber sleeve 9. The rectangular columnar rubber sleeve 9 is hollow, and the rectangular area of the upper part is larger than that of the lower part. After the mounting plate snap platform 64 is sleeved with the rubber sleeve 9, the upper half of the rubber sleeve 9 passes through the mounting plate snap hole 71, and the bottom surface of the rubber sleeve 9 is in contact with the instrument bottom shell 8.

[0054] The above embodiments describe the positions and connection relationships among the various components of the present invention. The following part describes the installation method of the present invention.

[0055] First, pass the panel mounting post 41 of the instrument panel 4 through the circuit board 5 and insert it onto the panel mounting seat 63 of the instrument middle sleeve 6. Then cover the instrument color film panel 3 on the instrument panel 4, and note that the instrument pattern on the instrument color film panel 3 corresponds to the opening on the instrument panel 4. After the instrument color film panel 3 is attached to the instrument panel 4, cover the instrument upper cover 2 above the instrument color film panel 3, and at the same time insert the upper cover insertion plate 21 onto the step inside the card slot 61 of the instrument middle sleeve 6.

[0056] After this part is installed, the instrument upper shell 1 and the instrument middle sleeve 6 are installed, and the buckle 13 of the instrument upper shell 1 is aligned with the buckle groove 68 of the upper instrument middle sleeve, and then the buckle 13 is buckled with the buckle platform 67 to complete the fixation of the instrument upper shell 1 and the instrument middle sleeve 6. The fixation has two layers, one is the outer wall of the outermost instrument upper shell 1, and the other layer is the upper cover plug plate 21 of the instrument upper cover 2.

[0057] Put the rubber sleeve 9 on the mounting plate clamping platform 64, put the instrument mounting plate 7 over the mounting plate clamping platform 64, let the instrument mounting plate fit with the lower surface of the middle sleeve threaded sleeve 65 of the instrument middle sleeve 6, align the mounting plate positioning holes 72 at the two end ears of the instrument mounting plate 7 with the threaded holes of the middle sleeve threaded sleeve 65, and then use bolts to install the instrument mounting plate 7 on the bottom of the instrument middle sleeve 6.

[0058] The last step is to install the instrument bottom shell 8. After aligning the buckle groove 82 of the instrument bottom shell 8 with the buckle 13, insert the bottom shell clamping platform 81 of the instrument bottom shell 8 into the clamping groove 61, and ensure that the middle sleeve mounting column 62 is inserted into the bottom shell mounting seat 83. Screw the bolts into the bottom shell mounting seat 83 to fix the instrument bottom shell 8 and the instrument middle sleeve 6. At this point, the installation of the circular instrument has been completed.

[0059] It can be seen that the utility model is mainly installed and fixed through the cooperation between structures, with less use of connecting parts. At the same time, the reliability of the connection and installation can be guaranteed, and at the same time, it ensures that the outer shell of the important part has two layers, which improves the protection ability of the internal components and is more durable.

[0060] Embodiment 2:

[0061] like Figure 4 As shown, it includes the implementation scheme in Example 1. This example specifically explains the main power supply circuit on the circuit board 5 of the utility model based on Example 1.

[0062] The main power supply circuit is a step-down circuit, which is connected to the sensor circuit and the central processing unit circuit. The main power supply circuit has the functions of stepping down and stabilizing the voltage. The high voltage is input from the IGN (+) pin, passes through the P pole of the diode 3D1, and is output from the N pole of the diode 3D1, ensuring the unidirectional conduction of the circuit.

[0063] The N - pole of diode 3D1 is in parallel with the positive pole of polar capacitor 3C10, one end of capacitor 3C0, one end of resistor 3R3, the emitter of triode 3Q1, the N - pole of zener diode 3ZD2, one end of resistor 3R4, and the drain of PMOS transistor 3Q2. Another branch circuit is connected to resistor 3R3. The other end of resistor 3R3 is in series with one end of the branch circuit. This end of the branch circuit is formed by the parallel connection of the N - pole of zener diode 3ZD1 and one end of resistor 3R1. The other end of resistor 3R1 is in series with the base of triode 3Q1. The collector of triode 3Q1 is in parallel with the other end of zener diode 3ZD2, the other end of resistor 3R4, one end of resistor 3R9, and one end of resistor 3R5.

[0064] The other end of resistor 3R9 is in series with the gate of PMOS transistor 3Q2. The source of PMOS transistor 3Q2 is in parallel with the positive pole of polar capacitor 3C2, one end of resistor 3R6, the positive pole of polar capacitor 3C6, capacitor 3C1, and the VIN pin of DCDC buck chip XL1507. At the same time, the source of PMOS transistor 3Q2 also outputs voltage V1 in parallel. The other end of resistor 3R6 is connected to the P - pole of diode 3D2, and the N - pole of triode 3D2 supplies power to the vehicle speed sensor.

[0065] The FB pin of DCDC buck chip XL1507 is in parallel with one end of resistor 3R7, one end of resistor 3R8, and one end of capacitor 3C5. The other end of resistor 3R7 is connected to GND. The OUTPUT pin of DCDC buck chip XL1507 is in parallel with the N - pole of diode 3D3 and one end of inductor 3L1. The other end of inductor 3L1 is in parallel with the other end of resistor 3R8, the other end of capacitor 3C5, one end of capacitor 3C3, the positive pole of polar capacitor 3C4, and the P - pole of diode 3D4. The other end of inductor 3L1 also leads out output voltage VCC.

[0066] The N - pole of diode 3D4 is in parallel with one end of inductor FB1. The other end of inductor FB1 is in parallel with the positive pole of polar capacitor 3C8 and the N - pole of zener diode TVS1.

[0067] The negative pole of polar capacitor 3C10, the other end of capacitor 3C0, the P - pole of zener diode 3ZD1, the other end of resistor 3R5, the negative pole of polar capacitor 3C2, the negative pole of polar capacitor 3C6, the negative pole of capacitor 3C1, the GND pin, ON / OFF pin of DCDC buck chip XL1507, the P - pole of diode 3D3, the other end of capacitor 3C3, the negative pole of polar capacitor 3C4, the negative pole of polar capacitor 3C8, and the P - pole of zener diode TVS1 are in parallel.

[0068] In this embodiment, the main power supply circuit uses the DCDC buck chip XL1507 to reduce the relatively high voltage to an output voltage of 5V. However, relying solely on the DCDC buck chip XL1507 to reduce the voltage to the operating voltage range of the device, since the present utility model needs to supply power to many LED light-emitting diodes, and only the LED light-emitting diodes can display the information on the instrument of the present utility model, it is necessary to ensure the stability of the power supply voltage for the main processor and the LED light-emitting diodes.

[0069] The conduction of the PMOS transistor 3Q2 is controlled by the triode 3Q1 to control the startup and shutdown of the instrument. Using a triode to control the PMOS transistor has the effects of fast response speed and small current controlling large current. Many zener diodes, capacitors and polarized capacitors are added in the bypass of the circuit, and an inductor is also connected in series in the circuit to filter the current, eliminate the fluctuations of the input voltage and the converted voltage, and ensure the stability of the power supply.

[0070] Through Embodiment 1 and Embodiment 2, the present utility model realizes the design and installation of an instrument with a simple, reliable, easy-to-maintain and install, durable installation connection structure. The main power supply circuit reduces the input relatively high voltage to the voltage at which the electronic devices and circuit boards can work normally, and filters and reduces the noise of the input and output voltages multiple times to ensure the stability of the instrument operation, further ensuring the stability and reliability of the instrument icon display on the instrument, improving the user experience, and ensuring the display quality of the instrument.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A circular motorcycle instrument, comprising a circuit board (5), characterized in that, On the bottom wall of the instrument upper shell (1) of the circular motorcycle instrument, there is a stepped upper shell clamping platform (12). Below the instrument upper shell (1), there is an instrument middle sleeve (6). On the outer wall of the instrument middle sleeve (6), there is a clamping groove (61). Below the instrument middle sleeve (6), there is an instrument bottom shell (8). On the top wall of the instrument bottom shell (8), there is a stepped bottom shell clamping platform (81). The upper shell clamping platform (12) is embedded in the upper groove of the clamping groove (61), and the bottom shell clamping platform (81) is embedded in the lower groove of the clamping groove (61).

2. The circular motorcycle instrument according to claim 1, characterized in that, Between the instrument upper shell (1) and the instrument middle sleeve (6), there is also an instrument upper cover (2). The instrument upper cover (2) covers above the instrument panel surface (4) with an instrument color film disk (3) attached. The circuit board (5) is located below the instrument panel surface (4). The panel mounting posts (41) of the instrument panel surface (4) pass through the circuit board (5) and are mounted on the panel mounting seats (63) of the instrument middle sleeve (6).

3. The circular motorcycle instrument according to claim 2, characterized in that, The circuit board (5) is divided into upper and lower layers. The upper-layer circuit board is attached to the bottom surface of the instrument panel surface (4), and the lower-layer circuit board is attached to the end surface at the top of the panel mounting seat (63).

4. The circular motorcycle instrument according to claim 2, wherein, On the instrument upper shell (1), there is a ring-shaped inward and downward instrument cover pressing platform (11). The lower end surface of the instrument cover pressing platform (11) is in contact with the upper surface of the instrument upper cover (2). The edge of the instrument upper cover (2) extends downward to form an upper cover insertion plate (21). The upper half of the instrument middle sleeve (6) is covered inside the upper cover insertion plate (21). The lower end surface of the upper cover insertion plate (21) is located at the inner upper end surface of the clamping groove (61).

5. The circular motorcycle instrument according to claim 1 or 2 or 3 or 4, characterized in that, On the instrument upper shell (1), there is a buckle (13). Below the clamping groove (61) of the instrument middle sleeve (6), there is a protruding buckle platform (68). In the clamping groove (61) above the buckle platform (68), there is an empty hole, and the arc length of the empty hole is greater than the arc length of the buckle (13).

6. The circular motorcycle instrument according to claim 1 or 2 or 3 or 4, characterized in that, In the middle of the instrument bottom shell (8), there is a ring-shaped platform. On the ring-shaped platform, there are several base mounting holes (83). At the bottom of the instrument middle sleeve (6), there are middle sleeve mounting posts (62) that cooperate with the base mounting holes (83).

7. The circular motorcycle instrument according to claim 1 or 2 or 3 or 4, characterized in that, On the inner wall of the upper part of the instrument bottom shell (8), there are buckle embedding grooves (82) spaced apart, which cooperate with the buckle (13).

8. The circular motorcycle instrument according to claim 1 or 2 or 3 or 4, characterized in that, On the circuit board (5), there is a main power supply circuit. The main power supply circuit is a step-down circuit and is connected to the sensor circuit and the central processor circuit.

9. The circular motorcycle instrument according to claim 8, wherein In the main power supply circuit, the filter and voltage stabilization partial circuit is connected to the input voltage IGN. The output end of the filter and voltage stabilization circuit leads to the input end of the DCDC step-down chip. The DCDC step-down chip outputs 5V voltage to lead to the central processor circuit.

10. The circular motorcycle instrument according to claim 9, wherein, The input voltage IGN of the filtering and voltage stabilizing circuit is connected to the P pole of the diode 3D1. The N pole of the diode 3D1 is connected in parallel with the positive pole of the polarized capacitor 3C10, one end of the capacitor 3C0, one end of the resistor 3R3, the emitter of the triode 3Q1, the N pole of the zener diode 3ZD2, one end of the resistor 3R4, and the drain of the PMOS transistor 3Q2. The negative pole of the capacitor 3C10, the other end of the capacitor 3C0, the P pole of the zener diode 3ZD1, and one end of the resistor 3R5 are connected in parallel.

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