A CAN bus heat-resistant waterproof terminal resistor

Abstract

The application discloses a CAN bus heat-resistant waterproof terminal resistor and relates to the field of CAN terminal resistors. The main shell is designed as a single opening type, a heat conducting piece is arranged in the main shell, the heat conducting piece is independently separated by a heat insulation positioning ring, an elastic plastic clamping piece is arranged on the upper side of the heat insulation positioning ring, a fixing bolt is used to penetrate the elastic plastic clamping piece, the heat insulation positioning ring and the heat conducting piece and is screwed and fixed, meanwhile, the upper metal rod on the upper side of the heat conducting piece penetrates the heat insulation positioning ring and the elastic plastic clamping piece upwards and extends into a heat dissipation cavity, heat generated by a PCB and a 120Ω resistor and heat transferred from the outside high temperature are absorbed, most of the heat is transferred to the heat collecting block, the heat in the heat dissipation cavity where the PCB is arranged is reduced, an edge inclined surface is designed on the edge of the outer side of the upper cover piece, a blocking protruding ring is designed, sufficient waterproof sealant can be injected on the edge of the upper cover piece, and the wiring port is not polluted.

Description

Technical Field

[0001] The present invention relates to the field of CAN terminal resistors, and in particular to a heat-resistant and waterproof terminal resistor for a CAN bus. Background Art

[0002] With the increasing breadth and depth of CAN bus technology's application in automotive electronics, particularly with the rapid development of autonomous driving, CAN has become one of the most widely used fieldbuses. However, for the CAN bus to function properly, termination resistors (120Ω) are required at both ends. These resistors match the bus impedance, improving interference immunity and reliability of data communication. As automotive features become increasingly complex, the load factor of the traditional CAN bus is increasing, reaching as high as 95%, far exceeding the design requirement of a peak load factor of 80%. To address this CAN bus load factor issue while maintaining compatibility with the CAN bus, the 2015 revision of ISO 11898-1 introduced CAN FD, or High-Speed ​​CAN. CAN FD increases the bit rate while providing shorter CAN frames and higher bandwidth. However, ISO 11898 stipulates that branches should not exceed 0.3 meters at a 1 Mbps baud rate. Excessively long branches can directly lead to bus impedance matching issues.

[0003] New energy vehicles can currently have more than 20 CAN bus networks, each with a complex wiring harness layout. The built-in terminal resistors are not waterproof and heat-resistant. To ensure bus reliability, the terminal resistors are currently located indoors throughout the vehicle, with the resistors being centrally located. However, to meet branch line length requirements, the main line is wound front and rear as close to each branch line node as possible, making the wiring harness cost and weight increasingly prominent.

[0004] Faced with the above situation, it is necessary to develop low-cost terminal resistors that have both good waterproof performance and heat resistance, so that the terminal resistors can be arranged on the vehicle without being constrained by the environment and a large amount of wiring harness winding costs can be reduced. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a CAN bus heat-resistant and waterproof terminal resistor, which not only meets the requirements of good waterproof performance but also meets the requirements of heat-resistant and low-cost terminal resistor, so that the terminal resistor can be arranged on the whole vehicle without being constrained by the environment, thereby reducing a large amount of wiring harness winding costs.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention provides a heat-resistant and waterproof terminal resistor for a CAN bus, comprising a two-wire resistor sheath body, the two-wire resistor sheath body comprising a main shell, a PCB board fixedly mounted in the main shell, the PCB board being provided with a 120Ω resistor, an upper cover fixedly mounted on an opening side of the main shell, the upper cover being provided with two wiring ports, an electrical connection portion cooperating with the wiring port being provided on a side of the upper cover facing the PCB board, the PCB board being provided with a group of pin rods electrically connected to the 120Ω resistor, the pin rods being cooperatively connected with the electrical connection portion of the upper cover.

[0008] The two-wire resistor sheath body also includes a positioning and installation square column located on the upper side of the bottom plate of the inner cavity of the main shell, and the positioning and installation square column is provided with a mounting threaded hole.

[0009] The inner cavity of the main shell is also equipped with a heat conductor, which includes a heat collecting block. The bottom side of the heat collecting block is provided with a square slot that cooperates with the positioning and mounting square column. The center of the heat collecting block is provided with a first through slot that passes through the square slot. The upper side of the heat collecting block is provided with multiple upper metal rods distributed on the side of the first through slot ring. The inner cavity of the main shell is also equipped with an insulation positioning ring and an elastic plastic clip. The insulation positioning ring is positioned and installed between the heat conductor and the elastic plastic clip.

[0010] The heat-insulating positioning ring comprises a heat-insulating ring plate, a center hole is provided at the center of the heat-insulating ring plate, and a plurality of ring holes distributed around the center hole are also provided on the heat-insulating ring plate.

[0011] The upper side of the heat collecting block is provided with a plurality of annularly distributed first positioning slots, and the side of the heat insulating ring plate facing the heat collecting block is provided with a plurality of lower protrusions, which are fitted in the first positioning slots.

[0012] The elastic plastic clip includes an insulation body, an insulation base plate located at the bottom of the insulation body, and multiple elastic strips located on the upper side of the insulation body. The elastic plastic clip is also provided with a central through groove vertically penetrating the insulation body and the insulation base plate, and multiple ring-position through grooves. The upper metal rod passes through the ring-position hole and the ring-position through groove upward. A curved opening is provided at the upper end of the elastic strip, and the lower end of the pin rod is limitedly inserted at the position of the curved opening.

[0013] The bottom side of the thermal insulation base plate is provided with a plurality of annularly distributed second positioning slots, and the side of the thermal insulation ring plate facing the thermal insulation base plate is provided with a plurality of upper protrusions, which are fitted in the second positioning slots.

[0014] A fixed long bolt is installed through the center through slot of the elastic plastic clip, the center hole of the insulation ring plate, and the first through slot of the heat collecting block. The lower end of the fixed long bolt is screwed to the mounting threaded hole position of the positioning mounting square column.

[0015] A heat dissipation cavity is formed inside the main shell between the elastic plastic card and the PCB board. An edge bevel is provided on the outward side of the upper cover, and waterproof sealant is filled between the edge bevel and the inner wall of the main shell opening.

[0016] As a preferred technical solution for the terminal resistor in the present invention, a retaining ring plate is provided on the inner wall of the main housing, and the PCB is retained above the retaining ring plate. An annular terminal mounting notch is also provided in the upper opening of the inner wall of the main housing, and the upper cover is positioned and mounted in the terminal mounting notch.

[0017] As a preferred technical solution for the terminal resistor in the present invention, the bottom cavity of the main housing is cylindrical, and the radial dimensions of the thermal insulation base plate, thermal insulation ring plate, and heat accumulation block match the radial dimensions of the bottom cavity of the main housing. The outer ring of the thermal insulation ring plate is equipped with a rubber ring that contacts the inner wall of the bottom cavity of the main housing.

[0018] As a preferred technical solution for the terminal resistor in the present invention, the fixing bolt includes a screw extending through the central slot, the central hole, and the first slot. The lower end of the screw is inserted into and threaded into the mounting threaded hole. The upper end of the screw is provided with a cross cap having a cross slot formed in the top side. The cross cap is fixed to the upper side of the insulation body.

[0019] As a preferred technical solution for the terminal resistor in the present invention: a circle of blocking protrusion ring is provided on the outward side of the upper cover, and the wiring port of the upper cover is located in the inner area of ​​the circle of blocking protrusion ring.

[0020] The present invention provides a method for installing a heat-resistant and waterproof terminal resistor for a CAN bus, the contents of which are as follows:

[0021] S1. First, place the thermal conductor into the main housing and push it to the bottom of the main housing. Align the square slot with the positioning installation column and insert it.

[0022] S2. Place the heat-insulating positioning ring into the main shell, align the ring hole with the upper metal rod, and continue to push the heat-insulating positioning ring inward to install the lower protrusion limiter at the first positioning slot position.

[0023] S3. Place the elastic plastic card into the main housing, align the ring slot with the upper metal rod, and continue to push the elastic plastic card inward to install the upper protrusion limiter at the second positioning slot position.

[0024] S4. Insert the long fixing bolt through the center slot, the center hole, and the first slot, and screw the lower end of the long fixing bolt into the mounting threaded hole to complete the fixed installation of the heat conductor, the heat insulation positioning ring, and the elastic plastic clip in the main shell.

[0025] S5. Fix the PCB board with the pin rod and the upper cover together. When connecting, connect the pin rod to the electrical connection part of the upper cover, then insert the pin rod of the PCB board into the main shell, and align and squeeze the pin rod into the curved opening position on the upper side of the elastic strip. The upper cover is limited and installed at the opening position of the main shell, and a circle of waterproof sealant is injected between the edge bevel of the upper cover and the main shell.

[0026] Compared with the existing technology, the beneficial effects of the present invention are:

[0027] The present invention designs a single-opening main shell, disposes a heat conductor inside the main shell, and designs a heat insulation positioning ring to independently isolate the heat conductor, disposes an elastic plastic clip on the upper side of the heat insulation positioning ring, and uses a fixing bolt to penetrate the elastic plastic clip, the heat insulation positioning ring, and the heat conductor and screw them together. When the PCB board is installed, the pin rod is directly used to cooperate with the curved opening of the elastic strip at the corresponding position to fix the position of the PCB board. At the same time, the upper metal rod on the upper side of the heat conductor penetrates the heat insulation positioning ring and the elastic plastic clip upward and extends into the heat dissipation cavity, absorbing the heat generated by the PCB board and the 120Ω resistor and the heat transferred in by the external high-temperature heat, and transferring most of the heat to the heat collecting block, thereby reducing the heat in the heat dissipation cavity where the PCB board is located. An edge bevel is designed on the outer side edge of the upper cover, and a blocking protrusion ring is designed, so that a sufficient amount of waterproof sealant can be injected into the edge of the upper cover without "polluting" the wiring port. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of the heat-resistant and waterproof terminal resistor for the CAN bus in the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of the structure with a partial enlargement at point A in the middle.

[0030] Figure 3 for Figure 1 Schematic diagram of the structure with a partial enlargement at point B.

[0031] Figure 4 This is a schematic diagram of the main components of the heat-resistant and waterproof CAN bus terminal resistor in the present invention.

[0032] Figure 5 It is a structural schematic diagram of the two-wire resistor sheath body in the present invention.

[0033] Figure 6 Schematic diagram of the structure of the heat conductor in the present invention.

[0034] Figure 7 It is a structural schematic diagram of the heat-insulating positioning ring in the present invention.

[0035] Figure 8It is a structural schematic diagram of the elastic plastic clip in the present invention.

[0036] Figure 9 It is a top view schematic diagram of the distribution position of multiple elastic strips of the elastic plastic clip in the present invention.

[0037] Figure 10 It is a structural diagram of the PCB board and the upper cover in the present invention.

[0038] Among them: 1-two-wire resistor sheath body, 101-main shell, 102-positioning installation square column, 103-installation threaded hole, 104-limiting ring plate, 105-end installation notch, 106-heat dissipation cavity; 2-thermal conductor, 201-heat collecting block, 202-square card slot, 203-first through slot, 204-upper metal rod, 205-first positioning card slot; 3-thermal insulation positioning ring, 301-thermal insulation ring plate, 302-lower protrusion, 303-upper protrusion, 304-center hole, 305-ring hole, 306 - rubber ring; 4- elastic plastic card, 401- heat-insulating body, 402- heat-insulating bottom plate, 403- second positioning slot, 404- center through slot, 405- ring through slot, 406- elastic strip, 407- curved opening; 5- long fixing bolt, 501- screw, 502- cross cap; 6- PCB board, 601- 120Ω resistor, 602- pin rod; 7- upper cover, 701- edge bevel, 702- blocking raised ring, 703- wiring port, 704- electrical connection; 8- waterproof sealant. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Example 1: The present invention designs a CAN bus heat-resistant and waterproof terminal resistor. The specific structural design and corresponding structural coordination contents are as follows:

[0041] See also Figure 1 、 Figure 4 、 Figure 5 The CAN bus heat-resistant and waterproof terminal resistor designed by the present invention includes the following main components: a two-wire resistor sheath body 1, a thermal conductor 2, a thermal insulation positioning ring 3, an elastic plastic clip 4, a fixing long bolt 5, a PCB board 6, and an upper cover 7.

[0042] The two-wire resistor sheath body 1 is provided with a main housing 101 , in which a PCB board 6 is fixedly installed, and the PCB board 6 is provided with a 120Ω resistor 601 .

[0043] See also Figure 1、 Figure 5 、 Figure 10 The upper cover 7 is sealed against the opening of the main housing 101 and is provided with two wiring ports 703 and two electrical connectors 704. The electrical connectors 704 face the PCB 6 and are electrically connected to the wiring ports 703. The PCB 6 is equipped with a set of pins 602 that are electrically connected to the 120Ω resistor 601. The pins 602 are mated with the electrical connectors 704 of the upper cover 7.

[0044] See also Figure 5 The two-wire resistor sheath body 1 also includes a positioning and mounting square column 102, which is located on the upper side of the bottom plate of the inner cavity of the main shell 101. A vertical mounting threaded hole 103 is opened at the center of the positioning and mounting square column 102. The inner wall of the main shell 101 is also provided with a circle of limiting ring plates 104, and the upper side opening of the inner wall of the main shell 101 is also provided with a circle of end mounting notches 105. Figure 1 The PCB board 6 is limitedly installed on the upper side of the limiting ring plate 104, and the upper cover 7 is positioned and installed at the end installation notch 105.

[0045] See also Figure 1 、 Figure 3 、 Figure 10 The upper end face of the upper cover 7 is provided with a beveled edge 701, and the outward-facing side of the upper cover 7 is provided with a barrier protrusion 702. Waterproof sealant 8 is filled between the beveled edge 701 and the inner wall of the opening of the main housing 101. The connection port 703 of the upper cover 7 is located within the area surrounding the barrier protrusion 702. This eliminates the risk of excessive sealant contamination when injecting the waterproof sealant 8.

[0046] See also Figure 1 、 Figure 5 、 Figure 6 A heat conducting member 2, a heat insulating positioning ring 3, and an elastic plastic clip 4 are sequentially installed in the inner cavity of the main shell 101 from bottom to top.

[0047] The heat conductor 2 is equipped with a heat collecting block 201, and a square card slot 202 is provided on the bottom side of the heat collecting block 201. The positioning and installation square column 102 is plugged into the square card slot 202. A first through slot 203 is provided at the center of the heat collecting block 201, and the first through slot 203 is connected to the square card slot 202. A plurality of upper metal rods 204 are provided on the upper side of the heat collecting block 201, and the plurality of upper metal rods 204 are distributed on the side of the first through slot 203. A plurality of first positioning card slots 205 are provided on the upper side of the heat collecting block 201, and the first positioning card slots 205 are distributed in a ring shape.

[0048] See also Figure 7The heat-insulating positioning ring 3 is provided with a heat-insulating ring plate 301, and a vertically penetrating center hole 304 is opened at the center position of the heat-insulating ring plate 301. The heat-insulating ring plate 301 is also provided with a plurality of annularly distributed ring holes 305, and the ring holes 305 are distributed around the center hole 304. Figure 1 、 Figure 2 、 Figure 6 A plurality of lower protrusions 302 are provided on the side of the heat-insulating ring plate 301 facing the heat-collecting block 201 , and the lower protrusions 302 are installed in cooperation with the first positioning slot 205 .

[0049] See also Figure 8 、 Figure 9 , the elastic plastic card 4 includes a heat insulation body 401, a heat insulation bottom plate 402, a second positioning card groove 403, a central through groove 404, an annular through groove 405, an elastic strip plate 406, and a curved opening 407. The heat insulation bottom plate 402 is located at the bottom of the heat insulation body 401. There are multiple elastic strip plates 406 and they are located on the upper side of the heat insulation body 401. Multiple annular through grooves 405 are distributed around the central through groove 404. The central through groove 404 and multiple annular through grooves 405 vertically penetrate the heat insulation body 401 and the heat insulation bottom plate 402. Multiple second positioning card grooves 403 are located on the bottom side of the heat insulation bottom plate 402. Multiple second positioning card grooves 403 are distributed in an annular manner. The curved opening 407 is opened on the upper side end of the elastic strip plate 406. Figure 2 The lower end of the pin rod 602 is limited and inserted at the position of the curved opening 407. Figure 7 , a plurality of upper protrusions 303 are provided on one side of the heat-insulating ring plate 301 facing the heat-insulating bottom plate 402. Figure 2 The upper protrusion 303 is installed in the position of the second positioning slot 403. Since the upper metal rod 204 is relatively small in diameter, it is easy to deform when subjected to strong external force during the fastening and installation process. The lower protrusion 302 is set on the lower side of the insulation ring plate 301 to cooperate with the first positioning slot 205. The upper protrusion 303 is designed on the upper side of the insulation ring plate 301 to cooperate with the second positioning slot 403. The main circumferential rotation force is transferred between the protrusion and the positioning slot, avoiding the force deformation of the upper metal rod 204.

[0050] See also Figure 1 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 The center slot 404 of the elastic plastic card 4, the center hole 304 of the heat insulating ring plate 301, and the first slot 203 of the heat collecting block 201 are penetrated and fixed with a long bolt 5. Figure 4Specifically, the fixing long bolt 5 includes a screw rod 501, a cross cap 502 is provided at the upper side end of the screw rod 501, and a cross slot is provided on the top side of the cross cap 502 for easy rotation with a screwdriver. The screw rod 501 passes through the center through groove 404, the center hole 304, and the first through groove 203. The lower end of the screw rod 501 is inserted into and screwed to the position of the mounting threaded hole 103, and the cross cap 502 is limitedly installed on the upper side of the heat insulation body 401.

[0051] Combine Figure 2 The cavity of the main housing 101, particularly the bottom cavity, is cylindrical. The radial dimensions of the thermal insulation base plate 402, the thermal insulation ring plate 301, and the heat accumulation block 201 match the radial dimensions of the bottom cavity of the main housing 101. A rubber ring 306 is installed on the outer ring side of the thermal insulation ring plate 301. The rubber ring 306 contacts the inner wall of the bottom cavity of the main housing 101 to avoid large gaps and reduce heat transfer from the heat accumulation block 201 to the heat dissipation cavity 106.

[0052] A heat dissipation cavity 106 is formed inside the main shell 101 between the elastic plastic card 4 and the PCB board 6. The heat generated by the PCB board 6 and the 120Ω resistor 601 is dissipated in the heat dissipation cavity 106, or is subject to external thermal interference, resulting in heat accumulation in the heat dissipation cavity 106. The accumulated heat is conducted to the heat accumulation block 201 through the upper metal rod 204. The heat accumulation block 201 is made of a copper alloy material that is easy to absorb heat, and can quickly absorb the heat in the heat dissipation cavity 106 to reduce the heat accumulation in the heat dissipation cavity 106. When the temperature of the heat dissipation cavity 106 or the outside world drops, the heat of the heat accumulation block 201 naturally begins to dissipate outward. Most of the heat is dissipated outward through the position of the main shell 101, and a small amount of heat enters the heat dissipation cavity 106 through the upper metal rod 204, but the heat dissipation through this path will not cause the temperature of the heat dissipation cavity 106 to rise rapidly.

[0053] Example 2: The present invention designs a CAN bus heat-resistant and waterproof terminal resistor. The following is an implementation method for installing it:

[0054] First, place the thermal conductor 2 into the main housing 101 and push it to the bottom of the main housing 101, aligning the square slot 202 with the positioning and installation square column 102. Then, place the thermal insulation positioning ring 3 into the main housing 101, aligning the ring hole 305 with the upper metal rod 204, and continuing to push the thermal insulation positioning ring 3 inward to limit the lower protrusion 302 to the position of the first positioning slot 205. Then, place the elastic plastic clamp 4 into the main housing 101, aligning the ring slot 405 with the upper metal rod 204, and continuing to push the elastic plastic clamp 4 inward to limit the upper protrusion 303 to the position of the second positioning slot 403. At this point, the basic positions of the thermal conductor 2, thermal insulation positioning ring 3, and elastic plastic clamp 4 are configured, and they can be tightened later.

[0055] When tightening the thermal conductor 2, the thermal insulation positioning ring 3, and the elastic plastic clip 4, the long fixing bolt 5 is passed through the central through groove 404, the central hole 304, and the first through groove 203, and the lower end of the long fixing bolt 5 is screwed into the mounting threaded hole 103 to complete the fixed installation of the thermal conductor 2, the thermal insulation positioning ring 3, and the elastic plastic clip 4 in the main shell 101.

[0056] Finally, the PCB board 6 with the pin rod 602 is fixedly connected to the upper cover 7. When connecting, the pin rod 602 is connected to the electrical connection part of the upper cover 7, and then the pin rod 602 of the PCB board 6 is inserted into the inside of the main shell 101, and the pin rod 602 is aligned and squeezed into the curved opening 407 on the upper side end of the elastic strip 406. The upper cover 7 is limited and installed at the opening position of the main shell 101, and a circle of waterproof sealant 8 is injected between the edge bevel of the upper cover 7 and the main shell 101.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A CAN bus heat-resistant and waterproof terminal resistor, comprising a two-wire resistor sheath body (1), the two-wire resistor sheath body (1) comprising a main shell (101), a PCB board (6) fixedly mounted in the main shell (101), the PCB board (6) being provided with a 120Ω resistor (601), an upper cover (7) fixedly mounted on the opening side of the main shell (101), the upper cover (7) being provided with two wiring ports (703), an electrical connection portion (704) matching the wiring port (703) being provided on the side of the upper cover (7) facing the PCB board (6), the PCB board (6) being provided with a group of pin rods (602) electrically connected to the 120Ω resistor (601), the pin rods (602) being matched with the electrical connection portion (704) of the upper cover (7), and characterized in that: The two-wire resistor sheath body (1) further comprises a positioning and mounting square column (102) located on the upper side of the inner cavity bottom plate of the main housing (101), and the positioning and mounting square column (102) is provided with a mounting threaded hole (103); The inner cavity of the main shell (101) is also provided with a heat conducting member (2), and the heat conducting member (2) includes a heat collecting block (201), and a square card slot (202) is provided on the bottom side of the heat collecting block (201) for plugging and matching with the positioning installation square column (102), and a first through slot (203) is provided at the center of the heat collecting block (201) and is connected to the square card slot (202), and a plurality of upper metal rods (204) are provided on the upper side of the heat collecting block (201) and are distributed around the first through slot (203); The inner cavity of the main housing (101) is further provided with a heat-insulating positioning ring (3) and an elastic plastic clamp (4), wherein the heat-insulating positioning ring (3) is positioned and installed between the heat-conducting member (2) and the elastic plastic clamp (4); The heat-insulating positioning ring (3) comprises a heat-insulating ring plate (301), a center hole (304) is provided at the center of the heat-insulating ring plate (301), and the heat-insulating ring plate (301) is further provided with a plurality of ring holes (305) distributed around the center hole (304); The upper side of the heat collecting block (201) is provided with a plurality of annularly distributed first positioning slots (205); the side of the heat insulating ring plate (301) facing the heat collecting block (201) is provided with a plurality of lower protrusions (302); the lower protrusions (302) are mounted in cooperation with the first positioning slots (205); The elastic plastic card (4) comprises a heat-insulating body (401), a heat-insulating bottom plate (402) located at the bottom of the heat-insulating body (401), and a plurality of elastic strips (406) located on the upper side of the heat-insulating body (401). The elastic plastic card (4) is further provided with a central through groove (404) vertically penetrating the heat-insulating body (401) and the heat-insulating bottom plate (402), and a plurality of ring-position through grooves (405). The upper metal rod (204) penetrates the ring-position hole (305) and the ring-position through groove (405) upward. The upper side end of the elastic strip (406) is provided with a curved opening (407), and the lower side end of the pin rod (602) is limitedly inserted at the position of the curved opening (407). The bottom side surface of the heat-insulating bottom plate (402) is provided with a plurality of annularly distributed second positioning slots (403); the side of the heat-insulating ring plate (301) facing the heat-insulating bottom plate (402) is provided with a plurality of upper protrusions (303); the upper protrusions (303) are mounted in cooperation with the second positioning slots (403); A fixing long bolt (5) is installed through the central through slot (404) of the elastic plastic clip (4), the central hole (304) of the heat-insulating ring plate (301), and the first through slot (203) of the heat-collecting block (201); the lower end of the fixing long bolt (5) is screwed and installed at the position of the mounting threaded hole (103) of the positioning mounting square column (102); A heat dissipation cavity (106) is formed inside the main housing (101) and is located between the elastic plastic card (4) and the PCB board (6). An edge bevel (701) is provided on an outward-facing side edge of the upper cover (7), and a waterproof sealant (8) is filled between the edge bevel (701) and the inner wall of the opening of the main housing (101).

2. A CAN bus heat-resistant and waterproof terminal resistor according to claim 1, characterized in that: The inner wall of the main housing (101) is further provided with a circle of limiting ring plate (104), and the PCB board (6) is limitedly mounted on the upper side of the limiting ring plate (104); The upper opening of the inner wall of the main housing (101) is also provided with a ring-shaped end mounting notch (105), and the upper cover (7) is positioned and mounted at the end mounting notch (105).

3. The heat-resistant and waterproof CAN bus terminal resistor according to claim 1, characterized in that: The bottom cavity of the main shell (101) is cylindrical, and the radial dimensions of the heat-insulating bottom plate (402), the heat-insulating ring plate (301), and the heat-collecting block (201) match the radial dimensions of the bottom cavity of the main shell (101); The outer ring side of the heat-insulating ring plate (301) is provided with a rubber ring (306) in contact with the inner wall of the bottom cavity of the main shell (101).

4. The heat-resistant and waterproof CAN bus terminal resistor according to claim 1, characterized in that: The fixing long bolt (5) comprises a screw rod (501) that passes through the central through slot (404), the central hole (304), and the first through slot (203), and the lower end of the screw rod (501) is inserted into and screwed into the mounting threaded hole (103); The upper end of the screw rod (501) is provided with a cross cap (502) with a cross groove on the top side surface, and the cross cap (502) is limitedly installed on the upper side of the heat insulation body (401).

5. The heat-resistant and waterproof CAN bus terminal resistor according to claim 1, characterized in that: A circle of blocking protrusion ring (702) is provided on the outward side of the upper cover (7), and the connection port (703) of the upper cover (7) is located in the inner area of ​​the circle of blocking protrusion ring (702).

6. A CAN bus heat-resistant and waterproof terminal resistor according to claim 1, characterized in that: Also includes its installation method: S1. First, place the heat conductor (2) into the main housing (101) and push it into the bottom of the main housing (101), align the square slot (202) with the positioning and installation square column (102) for insertion; S2. Place the heat-insulating positioning ring (3) into the main housing (101), align the ring hole (305) with the upper metal rod (204), and continue to push the heat-insulating positioning ring (3) inward, and limit the lower protrusion (302) to the first positioning slot (205); S3. Place the elastic plastic card (4) into the main housing (101), align the annular slot (405) with the upper metal rod (204), and continue to push the elastic plastic card (4) inward to limit the upper protrusion (303) to the second positioning slot (403); S4. Insert the fixing long bolt (5) through the central through groove (404), the central hole (304), and the first through groove (203), and screw the lower end of the fixing long bolt (5) into the mounting threaded hole (103), thereby completing the fixed installation of the heat conductor (2), the heat insulating positioning ring (3), and the elastic plastic clamp (4) in the main housing (101); S5. The PCB board (6) with the pin rod (602) is fixedly connected to the upper cover (7). When connecting, the pin rod (602) is connected to the electrical connection part of the upper cover (7). Then, the pin rod (602) of the PCB board (6) is inserted into the interior of the main shell (101). The pin rod (602) is aligned and squeezed into the curved opening (407) at the upper side end of the elastic strip (406). The upper cover (7) is limitedly installed at the opening position of the main shell (101). A circle of waterproof sealant (8) is injected between the edge bevel of the upper cover (7) and the main shell (101).

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