IMU sensor assembly

Abstract

The utility model discloses an IMU (Inertial Measurement Unit) sensor assembly, which comprises a shell, a sealing cover and a circuit board, a mounting groove is formed in the shell, and a buffer mounting structure for mounting the circuit board is arranged in the mounting groove; and the sealing cover is mounted on the buffer mounting structure and is positioned at the notch of the mounting groove. According to the IMU sensor assembly, the circuit board is damped and buffered through the arrangement of the buffer mounting structure, and when the IMU sensor assembly is subjected to external stress, the buffer mounting structure can absorb and disperse the stress, so that extrusion and stretching of the circuit board are reduced, the circuit board and a micro-mechanical structure on the circuit board can be kept relatively stable, and the service life of the IMU sensor assembly is prolonged. Measurement errors caused by deformation are reduced, the measurement precision and stability of the sensor are further ensured, it is ensured that a control system can accurately obtain feedback information, failure of the control system is avoided, and use safety is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to IMU sensor assembly technical field, concretely relates to a kind of IMU sensor assembly. BACKGROUND

[0002] IMU sensor assembly, namely the abbreviation of Inertial Measurement Unit, is a kind of electronic equipment for measuring and reporting object motion state. It is based on inertial navigation principle and angular velocity to accurately measure the motion state of object, and IMU sensor assembly is usually composed of accelerometer, gyroscope, and part IMU sensor assembly will add magnetometer. With the continuous progress of technology and cost reduction, IMU is widely used in a large number of fields, such as aerospace and national defense, automobile industry, industrial automation, etc.

[0003] Since IMU sensor assembly contains precise circuit board and micro-mechanical structure inside, these structures are very sensitive to external stress. When IMU sensor assembly is subjected to external impact or vibration, the circuit board can be extruded or stretched, causing the circuit board and micro-mechanical structure thereon to deform, thereby affecting the measurement accuracy and stability of the sensor, causing the control system to fail to accurately obtain feedback information, and further causing the control system to fail. This can cause the device to malfunction, and even affect safety hazards.

[0004] Therefore, how to reduce the influence of structural stress on IMU sensor assembly and improve the measurement accuracy and stability of IMU sensor assembly is a technical problem that needs to be solved at present. UTILITY MODEL CONTENT

[0005] The utility model aims at providing an IMU sensor assembly to solve the problem that the circuit board of the existing IMU sensor assembly in the background art is easily extruded or stretched after being subjected to external impact or vibration, causing the measurement accuracy of the sensor to decrease and the stability to deteriorate, and further causing the device to malfunction and affecting safety hazards.

[0006] To achieve the above-mentioned purpose, the utility model provides an IMU sensor assembly, which comprises a shell, a cover and a circuit board. The shell is provided with a mounting groove, and the mounting groove is provided with a buffer mounting structure for mounting the circuit board. The cover is mounted on the buffer mounting structure and located at the slot opening of the mounting groove.

[0007] Optionally, the shell is further provided with a mounting adaptation structure and a guide connection structure, and the circuit board is provided with a pin structure.

[0008] Optionally, the direction of the shell towards the mounting adaptation structure is perpendicular to the direction of the shell towards the guide connection structure.

[0009] Optionally, the mounting adapting structure comprises mounting portions arranged on two parallel outer walls of the shell, a round hole and a waist-shaped hole arranged on the two mounting portions respectively.

[0010] Optionally, a first metal block and a second metal block are arranged on the two mounting portions respectively; the round hole is arranged on the first metal block; and the waist-shaped hole is arranged on the second metal block.

[0011] Optionally, the guiding connecting structure comprises a connecting block arranged on the shell, a connecting groove arranged on the connecting block, and a through hole arranged on the shell and communicating with the mounting groove and the connecting groove, the through hole corresponding to the pin structure.

[0012] Optionally, a clamping step is arranged in the connecting groove, the clamping step being provided with a clamping insertion groove and a clamping insertion block; and a guiding block and a first protruding block are arranged on the outer wall of the connecting block.

[0013] Optionally, the pin structure comprises a pin frame, pins arranged on the pin frame at equal intervals, one end of the pin being arranged on the circuit board by welding, and the other end of the pin being arranged in the connecting groove through the through hole.

[0014] Optionally, the buffering mounting structure comprises a supporting column arranged on the bottom of the mounting groove, a connecting column arranged on the top of the supporting column, a rubber buffering block arranged on the circuit board in a detachable manner, and a connecting hole arranged on the rubber buffering block and corresponding to the connecting column; and the cover is provided with a limiting column corresponding to the connecting hole.

[0015] Optionally, an arc groove is arranged on the circuit board, the rubber buffering block is arranged in the arc groove, and the arc groove is arranged in a perfect arc on the top surface of the circuit board in a normal projection manner; and the longitudinal section of the rubber buffering block is arranged in an H-shaped manner.

[0016] Optionally, the rubber buffering block comprises a buffering column corresponding to the arc groove, limiting portions arranged on both ends of the buffering column, the diameters of the two limiting portions being greater than the diameter of the buffering column, and the minimum distance between the two limiting portions being equal to the thickness of the circuit board.

[0017] Optionally, a plurality of L-shaped blocks are arranged on the bottom of the mounting groove, the intervals of the L-shaped blocks corresponding to the pin structure; and a limiting block is arranged on the groove wall of the mounting groove, the limiting block limiting both sides of the pin structure.

[0018] Optionally, a limiting table is arranged on the groove wall of the mounting groove, a guiding surface is arranged on the side wall of the limiting table, and a clamping groove is arranged on the limiting table.

[0019] Optionally, a connecting clamping block is arranged on the bottom of the cover, a second protruding block corresponding to the clamping groove is arranged on the connecting clamping block, and a matching surface corresponding to the guiding surface is arranged on the second protruding block.

[0020] Compared with the prior art, the IMU sensor assembly has the following beneficial effects:

[0021] The IMU sensor assembly is provided with the buffer mounting structure, so that the circuit board is damped and buffered, when the IMU sensor assembly is subjected to external stress, the buffer mounting structure can absorb and disperse the stress, thereby reducing the extrusion and stretching of the circuit board, so that the circuit board and the micro-mechanical structure thereon can maintain relative stability, reduce the measurement error caused by deformation, and further ensure the measurement accuracy and stability of the sensor, ensure that the control system can accurately obtain feedback information, avoid control system failure, and ensure use safety. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the sensor of the utility model.

[0023] Figure 2 is a schematic diagram of the overall structure of the sensor of the utility model.

[0024] Figure 3 is a schematic diagram of the structure of the circuit board, the pin structure and the rubber buffer block of the utility model.

[0025] Figure 4 is a top view of the circuit board of the utility model.

[0026] Figure 5 is a schematic diagram of the structure of the rubber buffer block of the utility model.

[0027] Figure 6 is a schematic diagram of the longitudinal section of the rubber buffer block of the utility model.

[0028] Figure 7 is a schematic diagram of the structure of the housing of the utility model.

[0029] Figure 8 is a schematic diagram of the structure of the cover of the utility model.

[0030] Figure 9 is a schematic diagram of the structure of the cover of the utility model. Figure 8 is a local enlarged view of A in the utility model.

[0031] Figure 10 is a schematic diagram of the overall structure of the embodiment 2 of the utility model.

[0032] Identified in the figure: 1, the shell; 11, the mounting groove; 12, the L-shaped block; 13, the limiting block; 14, the limiting table; 15, the guide surface; 16, the clamping groove; 2, the cover; 21, the limiting column; 22, the connecting clamping block; 23, the second protrusion; 24, the matching surface; 3, the circuit board; 31, the arc groove; 32, the positioning hole; 4, the buffer mounting structure; 41, the supporting column; 42, the connecting column; 43, the rubber buffer block; 431, the buffer column; 432, the limiting part; 44, the connecting hole; 5, the mounting adaptation structure; 51, the mounting part; 52, the round hole; 53, the waist-shaped hole; 54, the first metal block; 55, the second metal block; 6, the guide connection structure; 61, the connecting block; 611, the guide block; 612, the first protrusion; 62, the connecting groove; 63, the through hole; 64, the clamping step; 641, the clamping slot; 642, the clamping plug; 7, the pin structure; 71, the pin frame; 72, the pin; 73, the positioning column. DETAILED DESCRIPTION

[0033] The following detailed description will be made in conjunction with the accompanying drawings and specific implementation. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0034] The IMU sensor assembly of the present application can be applied to the occasion of reporting vehicle attitude data at regular intervals under the power-on state of the vehicle, and of course can also be used for other similar application scenarios. The following describes an IMU sensor assembly in detail.

[0035] Embodiment 1

[0036] Referring to the accompanying Figure 1 — Figure 9 The structure schematic diagram of a preferred embodiment of the IMU sensor assembly of the present application is shown. The IMU sensor assembly comprises a shell 1, the shell 1 is provided with a mounting groove 11, the mounting groove 11 is provided with a buffer mounting structure 4, a circuit board 3 is installed through the buffer mounting structure 4, the circuit board 3 is located, a cover 2 is installed on the buffer mounting structure 4, and the cover 2 is located at the slot opening of the mounting groove 11.

[0037] The utility model discloses a through the setting of mounting groove 11 provides the installation position for circuit board 3 and buffer installation structure 4, through the setting of cover 2, the circuit board 3 is limited, prevents circuit board 3 from falling out from mounting groove 11, through the setting of buffer installation structure 4, can be absorbed and dispersed to stress, namely when the shell 1 is impacted by outside, buffer installation structure 4 can be absorbed and dispersed to the force of impact, thereby reduce the force that circuit board 3 is subjected to, reduce the shake of circuit board 3, and further reduce the extrusion and stretch that circuit board 3 is subjected to, so that circuit board 3 and the micro -mechanical structure on it can keep relatively stable, reduce the measurement error that generates due to deformation, and further ensure the measurement accuracy and stability of sensor, ensure that control system can accurately obtain feedback information, avoid control system failure, guarantee safe use.

[0038] Refer to the accompanying drawings Figure 2 Figure 4 As shown in the utility model discloses, shell 1 still is equipped with installation adaptation structure 5 and guide connecting structure 6 on, and circuit board 3 is equipped with pin structure 7, wherein, the direction of shell 1 towards installation adaptation structure 5 is perpendicular to the direction of shell 1 towards guide connecting structure 6.

[0039] The utility model discloses a through the setting of installation adaptation structure 5, it is convenient for staff to install sensor, through the setting of guide connecting structure 6, the external connecting line is guided, and it is convenient to connect IMU sensor assembly with external circuit, and it is convenient to provide transmission circuit and power circuit for sensor, through the setting of pin structure 7, the current connection and data transmission with external circuit, through the connection direction between installation adaptation structure 5 and guide connecting structure 6 and shell 1 is limited, ensures that after installing sensor, cover 2 cannot be disassembled, thereby guaranteeing the installation of cover 2, guaranteeing the firmness of the location of circuit board 3.

[0040] Refer to the accompanying drawings Figure 2 As shown in the utility model discloses, installation adaptation structure 5 includes setting installation part 51 on the parallel outer wall of shell 1, and round hole 52 and waist type hole 53 are set on two installation parts 51 respectively.

[0041] The utility model discloses a through the setting of installation part 51, is used for providing installation position for the installation of sensor, through the setting of round hole 52, provides the installation position of bolt, and after bolt is penetrated round hole 52, installs shell 1 one end of sensor, through the setting of waist type hole 53, the installation position of one of installation part 51 can be adjusted, reduces the machining accuracy, ensures that shell 1 can install normally, prevents the interference of bolt and hole wall.

[0042] Refer to the accompanying drawings Figure 1 And Figure 2 ​As shown, in this utility model, the guide connection structure 6 includes a connecting block 61 disposed on the outer shell 1, a connecting groove 62 disposed on the connecting block 61, and a through hole 63 disposed on the outer shell 1 that connects the mounting groove 11 and the connecting groove 62. The through hole 63 corresponds to the pin structure 7.

[0043] This utility model guides the connection between the sensor and the external circuitry through the connection block 61 and the connection groove 62, facilitating the connection between the sensor and the external circuitry. The through hole 63 avoids the pin structure 7, ensuring that the pin connected to the circuit board 3 can pass through the housing 1, so that the pin 72 is located in the connection groove 62, ensuring that data can be transmitted and current can be connected.

[0044] See appendix Figure 2 As shown, in this utility model, the connecting groove 62 is provided with a locking step 64, and the locking step 64 is provided with a locking slot 641 and a locking insert 642; the outer wall of the connecting block 61 is provided with a guide block 611 and a first protrusion 612.

[0045] This invention, through the engagement slot 641 and engagement block 642, limits the connection direction of the connecting groove 62, ensuring that the external connection end can only connect and cooperate with the pin after its position and direction are correct, thus protecting the pin 72 and preventing the pin 72 from bending due to incorrect orientation of the external connection end; through the guide block 611, it guides the external connection segment when connecting with the guide connection structure 6; through the first protrusion 612, it prevents the external connection end from separating from the guide connection structure 6 during use. It should be noted that the outer wall of the external connection end is provided with a groove corresponding to the first protrusion 612, and the first protrusion 612 is made of plastic or other materials.

[0046] See appendix Figure 3 and Figure 4 As shown, in this utility model, the pin structure 7 includes a pin frame 71 and pins 72 that are equally spaced on the pin frame 71. One end of the pin 72 is soldered onto the circuit board 3, and the other end is located in the connecting groove 62 through a through hole 63.

[0047] This utility model provides a mounting position and support for the pin 72 by setting the pin holder 71. It should be noted that the circuit board 3 is provided with a positioning hole 32, and the pin holder 71 is provided with a positioning post 73 corresponding to the positioning hole 32, so that the pin 72 can be fixedly mounted on the circuit board 3 by soldering.

[0048] See appendix Figure 5 — Figure 8As shown in the utility model, the buffer mounting structure 4 includes a support column 41 arranged at the bottom of the mounting groove 11, a connecting column 42 mounted on the top of the support column 41, a rubber buffer block 43 mounted on the circuit board 3, and a connecting hole 44 arranged on the rubber buffer block 43 and corresponding to the connecting column 42.

[0049] The utility model discloses a support column 41 is arranged, and the circuit board 3 is supported, prevents the electrical component on the circuit board 3 from contacting with the groove wall of mounting groove 11, avoids the collision of electrical component and groove wall, thereby protects the electrical component, the installation position of rubber buffer block 43 is limited through the setting of connecting column 42, thereby the installation position of circuit board 3 is limited, the installation position of rubber buffer block 43 can be installed on connecting column 42 through the setting of connecting hole 44, and stress is absorbed and dispersed, the top of rubber buffer block 43 can be limited by the setting of limiting column 21 of cover 2, thereby the circuit board 3 is limited, prevents the circuit board 3 from shaking.

[0050] Referring to the accompanying drawings Figure 3 And Figure 4 As shown in the utility model, the circuit board 3 is provided with an arc groove 31, and the rubber buffer block 43 is mounted in the arc groove 31, and the orthographic projection of the arc groove 31 on the top surface of the circuit board 3 is an inferior arc; the longitudinal section of the rubber buffer block 43 is in the shape of an I-beam. The rubber buffer block 43 includes a buffer column 431 matched with the arc groove 31, limiting portions 432 arranged on both ends of the buffer column 431, the diameters of the two limiting portions 432 are greater than the diameter of the buffer column 431, and the minimum distance between the two limiting portions 432 is equal to the thickness of the circuit board 3.

[0051] The utility model discloses the setting of arc groove 31 provides the installation position for rubber buffer block 43, so that the circuit board 3 can be installed with rubber buffer block 43, and the stress that the circuit board 3 will receive is absorbed and dispersed, the arc length of the orthographic projection of arc groove 31 on the circuit board 3 is limited, the opening of arc groove 31 and external communication is ensured to be inferior arc, so that the size of the opening is less than the diameter of the buffer column 431, and the condition that rubber buffer block 43 separates from arc groove 31 at will is prevented, the top surface and the bottom surface of the circuit board 3 can be contacted and limited by the setting of limiting portion 432, and the distance between the two limiting portions 432 is limited, so that the top and the bottom of the circuit board 3 are limited by the limiting portion 432.

[0052] Referring to the accompanying drawings Figure 1 — Figure 7 As shown in the utility model, the bottom of the mounting groove 11 is provided with a plurality of L-shaped blocks 12, the distance between the L-shaped blocks 12 corresponds to the pin structure 7, the groove wall of the mounting groove 11 is provided with a limiting block 13, and the two sides of the pin structure 7 are limited by the limiting block 13.

[0053] The utility model discloses through the setting of L type block 12, the installation position of pin 72 is reminded, and the distance between adjacent L type block 12 corresponds with the staggered setting of the through -hole 63 of pin 72 and L type block 12, need to specially point out that L type block 12 does not contact with pin stand 71, through the setting of limiting block 13, the both sides of pin stand 71 are limited.

[0054] Referring to the drawings Figure 7 — Figure 9 As shown in the utility model discloses, the groove wall of mounting groove 11 is equipped with limiting platform 14, and the limiting platform 14 is equipped with guide surface 15, and the side wall of limiting platform 14 is equipped with clamping groove 16;The bottom of cover 2 is equipped with connecting clamping block 22, and the second protruding block 23 that is adapted with clamping groove 16 is installed on connecting clamping block 22, and the upper of second protruding block 23 is equipped with the matching surface 24 corresponding with guide surface 15.

[0055] The utility model discloses through the setting of limiting platform 14, the installation position of cover 2 is limited;Through the setting of guide surface 15, cooperation matching surface 24 can guide second protruding block 23, and the cooperation of second protruding block 23 and clamping groove 16 is facilitated clamping;Specifically, when installing cover 2, only need to put cover 2 into mounting groove 11, and press cover 2, make the matching surface 24 on the second protruding block 23 of cover 2 bottom along guide surface 15 move, when second protruding block 23 moves to clamping groove 16, second protruding block 23 will reset and be clamped into clamping groove 16, and the installation of cover 2 is completed.

[0056] Referring to the drawings Figure 1 — Figure 9 As shown in the utility model discloses the use process as follows:

[0057] Install rubber buffer block 43 in arc groove 31, then insert pin 72 into through -hole 63 obliquely, then place circuit board 3 flat, make connecting hole 44 on rubber buffer block 43 correspond with connecting column 42, press circuit board 3 and make connecting column 42 insert into connecting hole 44, then place cover 2 at the slot of mounting groove 11, and make the limiting column 21 on cover 2 also insert into connecting hole 44;Finally through the pre-installation of bolt through -hole 52, then through another bolt through -hole waist type hole 53 and mounting position thread cooperation, then lock two bolts, complete the installation of sensor, finally through the connecting section of external connecting line and the guide connection structure 6 in sensor are connected.

[0058] The application fixes the circuit board 3 by installing the rubber buffer block 43 on the circuit board 3 and fixing the rubber buffer block 43, and in the use process, when the shell 1 of the sensor is subjected to external stress, the shell 1 transmits the force to the supporting column 41, the supporting column 41 drives the connecting column 42 to shake, and in the process of shaking, the connecting column 42 extrudes the rubber buffer block 43, and at this time, the rubber buffer block 43 absorbs and disperses the extrusion force, avoids the force acting on the circuit board 3, so that the circuit board 3 and the micro-mechanical structure thereon can keep relatively stable, reduces the measurement error caused by reprogramming, and ensures the measurement accuracy and stability of the sensor.

[0059] Embodiment 2

[0060] Referring to the accompanying Figure 10 The difference between the embodiment and the above-mentioned embodiment is that the first metal block 54 and the second metal block 55 are respectively arranged on the two mounting portions 51, the round hole 52 is arranged on the first metal block 54, and the waist-shaped hole 53 is arranged on the second metal block 55.

[0061] In the embodiment, the first metal block 54 and the second metal block 55 are respectively arranged on the two mounting portions 51 by hot melting, the round hole 52 and the waist-shaped hole 53 are arranged on the metal block, which is easier to process and has higher precision, and the hot melting or rupture of the plastic in the process of punching can be effectively prevented.

[0062] The above-mentioned embodiments are descriptions of the application, not limitations of the application, and any simple transformation of the application also belongs to the protection scope of the application.

Claims

1. An IMU sensor assembly, characterized in that, Includes outer casing (1), cover (2), and circuit board (3); The outer casing (1) is provided with a mounting groove (11), and a buffer mounting structure (4) for mounting the circuit board (3) is provided in the mounting groove (11). The cover (2) is installed on the buffer mounting structure (4) at the opening of the mounting groove (11).

2. The IMU sensor assembly according to claim 1, characterized in that, The outer casing (1) is also provided with an installation adapter structure (5) and a guide connection structure (6), and the circuit board (3) is provided with a pin structure (7).

3. The IMU sensor assembly according to claim 2, characterized in that, The direction in which the outer shell (1) faces the mounting adapter structure (5) is perpendicular to the direction in which the outer shell (1) faces the guide connection structure (6).

4. The IMU sensor assembly according to claim 2, characterized in that, The mounting adapter structure (5) includes mounting portions (51) provided on two parallel outer walls of the outer shell (1), and round holes (52) and waist-shaped holes (53) respectively provided on the two mounting portions (51).

5. The IMU sensor assembly according to claim 4, characterized in that, A first metal block (54) and a second metal block (55) are respectively installed on the two mounting parts (51); The circular hole (52) is on the first metal block (54); The waist-shaped hole (53) is provided in the second metal block (55).

6. The IMU sensor assembly according to claim 2, characterized in that, The guide connection structure (6) includes a connection block (61) disposed on the housing (1), a connection groove (62) disposed on the connection block (61), and a through hole (63) disposed on the housing (1) connecting the mounting groove (11) and the connection groove (62), the through hole (63) corresponding to the pin structure (7).

7. The IMU sensor assembly according to claim 6, characterized in that, The connecting groove (62) is provided with a locking step (64), and the locking step (64) is provided with a locking slot (641) and a locking plug (642). The outer wall of the connecting block (61) is provided with a guide block (611) and a first protrusion (612).

8. The IMU sensor assembly according to claim 6, characterized in that, The pin structure (7) includes a pin frame (71) and pins (72) that are equally spaced on the pin frame (71). One end of the pin (72) is soldered onto the circuit board (3), and the other end is located in the connection groove (62) through a through hole (63).

9. The IMU sensor assembly according to claim 1, characterized in that, The buffer mounting structure (4) includes a support column (41) set at the bottom of the mounting groove (11), a connecting column (42) installed on the top of the support column (41), a rubber buffer block (43) detachably installed on the circuit board (3), and a connecting hole (44) set on the rubber buffer block (43) corresponding to the connecting column (42). The cover (2) is provided with a limiting post (21) corresponding to the connecting hole (44).

10. The IMU sensor assembly according to claim 9, characterized in that, The circuit board (3) is provided with an arc groove (31), and the rubber buffer block (43) is installed in the arc groove (31). The arc groove (31) is set in an arc shape when projected onto the top surface of the circuit board (3). The longitudinal section of the rubber buffer block (43) is arranged in an I-shape; The rubber buffer block (43) includes a buffer post (431) adapted to the arc groove (31), and limiting parts (432) provided at both ends of the buffer post (431). The diameter of the two limiting parts (432) is greater than the diameter of the buffer post (431), and the minimum distance between the two limiting parts (432) is equal to the thickness of the circuit board (3). The bottom of the mounting groove (11) is provided with a plurality of L-shaped blocks (12), the spacing of which corresponds to the pin structure (7); the wall of the mounting groove (11) is provided with a limiting block (13), which limits the two sides of the pin structure (7). The mounting groove (11) has a limiting platform (14) on its groove wall, and a guide surface (15) on its limiting platform (14). The side wall of the limiting platform (14) has a locking groove (16). The bottom of the cover (2) is provided with a connecting block (22), and a second protrusion (23) that is adapted to the engaging groove (16) is installed on the connecting block (22). The second protrusion (23) is provided with a mating surface (24) corresponding to the guide surface (15).

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