CN112838973B - CAN bus diagnosis interface switching device - Google Patents
CAN bus diagnosis interface switching device Download PDFInfo
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- CN112838973B CN112838973B CN202110005069.3A CN202110005069A CN112838973B CN 112838973 B CN112838973 B CN 112838973B CN 202110005069 A CN202110005069 A CN 202110005069A CN 112838973 B CN112838973 B CN 112838973B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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Abstract
The invention relates to the technical field of automobile CAN bus diagnosis, and discloses a CAN bus diagnosis interface switching device which comprises a switching component and a plug connector used for connecting a whole automobile wire harness and OBD equipment, wherein the plug connector is provided with a first wire group and a plurality of groups of second wire groups, the switching component comprises a fixed part and a movable part movably connected with the fixed part, the fixed part is provided with a first conductor and a plurality of second conductors arranged at intervals, the first conductor is connected with the first wire group, the plurality of second conductors are connected with the plurality of groups of second wire groups in a one-to-one correspondence manner, and the movable part is provided with a third conductor used for conducting the first conductor and any one of the second conductors. The invention solves the problems of complex use and poor flexibility existing in the prior art for diagnosing a plurality of groups of CAN buses.
Description
Technical Field
The invention relates to the technical field of automobile CAN bus diagnosis, in particular to a CAN bus diagnosis interface switching device.
Background
In a new standard of vehicle annual inspection, an OBD II (On-Board Diagnostics, vehicle-mounted diagnostic system II) detection item is added, which requires that an OBD device cannot be disconnected throughout the entire process of detecting vehicle emission pollutants in order to make detection data more accurate. In addition, based on the existing ISO DIS 15031-3 specifications, the network architecture of current OBD devices is basically a single CAN bus and requires that the DLC (DATA LINK CONNECTOR) be a unified 16 pin socket, with pins 2, 6, 7, 10, 14 and 15 being used for diagnostic communication, and pins 6 or 14 requiring a CAN bus designed to read vehicle emissions information.
However, under the background of increasing intelligence of automobiles, the network architecture of a single CAN bus is far from meeting the communication requirement of the whole automobile, so the network architecture of multiple CAN buses becomes the mainstream, which also puts requirements on diagnosis of multiple groups of CAN buses, but as mentioned above, the current standard OBD II CAN only place one group of CAN buses.
In order to meet the requirements for diagnosing a plurality of groups of CAN buses, the domestic host factory mainly adopts the following 3 modes:
(1) Reserving a connector: and all CAN lines are placed in the reserved connectors, and the required CAN bus is read through a pin or a wire. The method CAN only be used as research and development or professional maintenance personnel, is relatively complicated in the using process, requires relatively long time for switching the CAN line, and is lack of connection reliability. Therefore, the non-fixed installation mode is a temporary connection mode, has certain potential safety hazard and cannot be popularized to after-sale maintenance.
(2) Reserving a nonstandard DLC interface: similar to the standard OBD II installation position, a nonstandard DLC interface is reserved at the easy maintenance position for placing all CAN lines, and the non-standard DLC interface CAN be connected with a diagnostic instrument through pins or patch cords. However, the method also has the problems of complicated use, high cost, easy confusion with standard OBD II and difficult popularization for after-sale maintenance.
(3) The gateway unifies the diagnosis interface: the gateway designs an independent diagnostic CAN through which nodes on the remaining CAN lines CAN be diagnosed. Although standard OBD II definition is not changed, the method is simple to use and is beneficial to popularization. But it also presents distinct short plates: one is that all controllers are required to open up diagnostic protocol content for gateway development, while some controller diagnostic protocols are kept secret; secondly, the data requirements of the rules or after-market on the OBD may be changed, so the gateway must be changed to meet the requirements; thirdly, if a controller is still in the development stage, the data is not solidified, and therefore the gateway cannot support the diagnosis of the controller. Therefore, the method has poor flexibility, long change period and design missing risk, is difficult to meet the debugging and calibration requirements in the research and development stage, and can only be used for diagnosis and design of mass production and post-curing.
In summary, there is an urgent need for a switching device of CAN bus diagnostic interface, which is simple to use and has high flexibility.
Disclosure of Invention
The invention provides a CAN bus diagnosis interface switching device which is used for solving the problems of complex use and poor flexibility in the prior art.
In order to solve the technical problem, the invention provides a CAN bus diagnosis interface switching device, which comprises a switching component and a plug connector used for connecting a whole vehicle wire harness and OBD equipment, wherein the plug connector is provided with a first wire group and a plurality of groups of second wire groups, the switching component comprises a fixing component and a moving component movably connected with the fixing component, the fixing component is provided with a first conductor and a plurality of second conductors arranged at intervals, the first conductor is connected with the first wire group, the plurality of second conductors are in one-to-one correspondence with the plurality of groups of second wire groups and connected with the plurality of groups of second conductor groups, and the moving component is provided with a third conductor used for conducting the first conductor and any one of the second conductors.
Preferably, a through hole is formed in the middle of the fixing piece, and the movable piece is rotatably arranged in the through hole and is coaxial with the fixing piece.
Preferably, the first electrical conductor includes a first higher conductive portion and a first lower conductive portion, the second electrical conductor includes a second higher conductive portion and a second lower conductive portion, and the third electrical conductor includes a third higher conductive portion for communicating the first higher conductive portion and the second higher conductive portion and a third lower conductive portion for communicating the first lower conductive portion and the second lower conductive portion; the first high-order conductive part and the second high-order conductive part are arranged on a first side of the fixing piece, the first low-order conductive part and the second low-order conductive part are arranged on a second side of the fixing piece opposite to the first side, the first lead group and the multiple groups of second lead groups respectively comprise high-order data wires and low-order data wires, the high-order data wires are connected with the first high-order conductive part and the second high-order conductive part in a one-to-one correspondence mode, and the low-order data wires are connected with the first low-order conductive part and the second low-order conductive part in a one-to-one correspondence mode.
Preferably, the fixed part and the moving part are both cylindrical structures, and two axial side faces of the moving part and two axial side faces of the fixed part are respectively on the same plane.
Preferably, the first and second conductive bodies are arranged along a circumferential direction of the through hole.
Preferably, the fixing member includes a first mounting portion and a second mounting portion, an inner diameter of the first mounting portion is larger than an inner diameter of the second mounting portion, the first conductor is disposed on the first mounting portion, the second conductor is disposed on the second mounting portion, one end of the third conductor abuts against an inner side wall of the first mounting portion, and the other end of the third conductor abuts against an inner side wall of the second mounting portion.
Preferably, a groove for embedding one end of the third conductor is formed in a position of the inner side wall of the second mounting portion corresponding to the second conductor.
Preferably, the outer peripheral surface of the fixing piece is provided with an annular groove communicated with the through hole.
Preferably, still include the gyro wheel, the gyro wheel cover is established on the moving part and with moving part fixed connection, the gyro wheel inlays to be located in the ring channel.
Preferably, the roller switch further comprises a housing, the plug connector and the switching component are arranged in the housing, and the housing is provided with a window for exposing the roller.
Compared with the prior art, the CAN bus diagnosis interface switching device has the beneficial effects that:
when the OBD device is used, a plurality of groups of second conductor groups are correspondingly connected with a plurality of groups of CAN buses of a whole vehicle wire harness through the plug connectors, the first conductor groups are connected with OBD equipment through the plug connectors, the fixing part is provided with the first conductor and a plurality of second conductors arranged at intervals, the plurality of second conductors correspond to the plurality of groups of second conductor groups one by one and are connected with the OBD device, the moving part is provided with the third conductor for conducting the first conductor and any second conductor, therefore, the first conductor and any second conductor CAN be mutually communicated through the moving part, the first conductor groups CAN be respectively correspondingly connected with the plurality of groups of CAN buses through the plurality of groups of second conductor groups, and therefore, one OBD device CAN be connected to different CAN buses according to different requirements, the requirements of the current diagnosis of the plurality of groups of CAN buses are met, and the OBD device is simple to use and high in flexibility. In addition, the invention does not change the definition of the OBD II interface and is completely compatible with the diagnosis instrument in the market.
Drawings
FIG. 1 is a block diagram of an embodiment of the present invention;
FIG. 2 is an internal structural view in an embodiment of the present invention;
FIG. 3 is an external structural view in the embodiment of the present invention;
fig. 4 is a wiring schematic in an embodiment of the invention.
In the figure, the position of the upper end of the main shaft,
100. a CAN bus diagnosis interface switching device,
1. plug connector, 2, switching component;
21. a fixing piece 211, a first mounting part 212, a second mounting part 213 and a groove;
22. a movable member;
23. a first conductor 231, a first high-order conductive part 232, a first low-order conductive part;
24. a second conductor 241, a second upper conductive part 242, and a second lower conductive part;
25. a first set of conductive lines, a second set of conductive lines,
26. a third conductor 261, a third high-order conductive part 262, and a third low-order conductive part;
27. a second conductor group, 28, a high data line, 29, a low data line;
3. and the roller 4 is a shell.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but the information should not be limited to these terms, which are used only to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
It should be noted that the drawings of the present embodiment are only schematic system drawings, and do not represent all the components of the present invention, and the core principle of the present embodiment is the same as that of the present embodiment by adding components to the present system.
With reference to fig. 1-2, an embodiment of the present invention provides a CAN bus diagnostic interface switching apparatus, including a plug connector 1 and a switching assembly 2, where the plug connector 1 is used to connect a complete vehicle harness (the complete vehicle harness includes multiple groups of CAN buses) and an OBD device, and the plug connector 1 is provided with a first conductor group 25 and a second conductor group 27. Specifically, one group of OBD devices may be connected to multiple groups of CAN buses or multiple groups of OBD devices may be connected to multiple groups of CAN buses, respectively; the switching component 2 includes a fixed component 21 and a movable component 22 movably connected to the fixed component 21, the fixed component 21 is provided with a first conductor 23 and a plurality of second conductors 24 arranged at intervals, the first conductor 23 is connected to a first conductor set 25, the plurality of second conductors 24 are connected to a plurality of second conductor sets in a one-to-one correspondence manner, the movable component 22 is provided with a third conductor 26 for conducting the first conductor 23 and any one of the second conductors 24, specifically, the first conductor 23, the second conductor 24 and the third conductor 26 are made of conductive materials, a jack corresponding to the first conductor 23 is connected to the OBD device, and a jack corresponding to the second conductor 24 is connected to the CAN bus, so that the OBD device is connected to different CAN buses according to different detection requirements. In addition, the switching component 2 can also realize the switching function through button keys.
Based on the above technical solutions, in the CAN bus diagnosis interface switching apparatus 100 provided in the embodiments of the present invention, when in use, the plurality of second wire groups 27 are correspondingly connected to the plurality of CAN buses of the entire vehicle harness through the plug connector 1, and the first wire group 25 is connected to the OBD device through the plug connector 1, the fixing member 21 of the present invention is provided with the first conductor 23 and the plurality of second conductors 24 arranged at intervals, and the plurality of second conductors 24 are connected to the plurality of second wire groups 27 in a one-to-one correspondence manner, and the moving member 22 is provided with the third moving member 26 for conducting the first conductor 23 and any one of the second conductors 24, so that the first conductor 23 and any one of the second conductors 24 CAN be mutually communicated by using the moving member 22, and the first wire group 25 CAN be respectively connected to the plurality of CAN buses through the plurality of second wire groups 27, thereby realizing that one OBD device CAN be connected to different CAN buses according to different needs, meeting the requirements of the current CAN bus diagnosis, and being simple to use and high in flexibility. In addition, the invention does not change the definition of the OBD II interface and is completely compatible with the diagnosis instrument in the market.
Further, a through hole is formed in the middle of the fixed member 21, and the movable member 22 is rotatably disposed in the through hole and is coaxial with the fixed member 21.
Further, the first electrical conductor 23 includes a first upper conductive portion 231 and a first lower conductive portion 232, the second electrical conductor 24 includes a second upper conductive portion 241 and a second lower conductive portion 242, and the third electrical conductor 26 includes a third upper conductive portion 261 for communicating the first upper conductive portion 231 and the second upper conductive portion 241 and a third lower conductive portion 262 for communicating the first lower conductive portion 232 and the second lower conductive portion 242; specifically, the third high-position conductive portion 261 and the third low-position conductive portion 262 are metal crossbars which are respectively disposed on two axial sides of the movable element 22;
the first high conductive part 231 and the second high conductive part 241 are disposed on a first side of the fixing part 21, and the first low conductive part 232 and the second low conductive part 242 are disposed on a second side of the fixing part 21 opposite to the first side, specifically, the first high conductive part 231 and the second high conductive part 241 and the first low conductive part 232 and the second low conductive part 242 in this embodiment are symmetrically disposed on two sides of the fixing part in the axial direction, respectively, wherein the first conductive line group 25 and the plurality of second conductive line groups 27 each include a high-level data line 28 and a low-level data line 29, the high-level data lines 28 are connected with the first high conductive part 231 and the second high conductive part 241 in a one-to-one correspondence manner, and the low-level data lines 29 are connected with the first low conductive part 232 and the second low conductive part 242 in a one-to-one correspondence manner. That is, when the movable member 22 is rotated, one side of the movable member realizes the connection between the high level of a set of CAN bus and the high level of the OBD device, and the other side realizes the connection between the low level of the CAN bus and the low level of the OBD device. Specifically, the upper data line 28 connecting the third upper conductive part 261 and the third lower data line 29 connecting the third upper conductive part 261 are located on the left or right of the plug 1.
Furthermore, the fixed member 21 and the movable member 22 are both cylindrical structures, and two axial side surfaces of the movable member 22 and two axial side surfaces of the fixed member 21 are respectively on the same plane, so that the third conductor 26 is convenient to realize the connection between the first conductor 23 and the plurality of second conductors 24 arranged at intervals.
Further, the first conductor 23 and the second conductor 24 are arranged along the circumferential direction of the through hole.
Further, the fixed member 21 includes a first mounting portion 211 and a second mounting portion 212, an inner diameter of the first mounting portion 211 is larger than an inner diameter of the second mounting portion 212, the first conductor 23 is disposed on the first mounting portion 211, the second conductor 24 is disposed on the second mounting portion 212, one end of the third conductor 26 abuts against the first mounting portion 211, and the other end abuts against any one of the second mounting portions 212, so as to ensure that one end thereof CAN be always connected to the first conductor 23 correspondingly connected to one OBD device, and the other end thereof is connected to the second conductor 24 correspondingly connected to the CAN bus, regardless of the rotation of the movable member 22.
Preferably, the inner side wall of the second mounting portion 212 is provided with a groove 213 for embedding one end of the third conductor 26 at a position corresponding to the second conductor 24, which CAN fix the third conductor 26 and avoid the mobile CAN bus diagnostic interface switching device 100 from causing a mis-connection due to a displacement of the third conductor 26 in the moving process.
Further, the circumferential surface of the fixed member 21 is provided with an annular groove communicated with the through hole, and the roller 3 is embedded in the annular groove, so that the roller 3 can be sleeved on the movable member 22 and is fixedly connected with the movable member 22, and particularly, the roller 3 is made of a non-conductive material, such as plastic, so that a user can conveniently rotate the movable member 22.
Preferably, jacks corresponding to the low positions of all the CAN buses and the low positions of the OBD device are located on one side of the plug connector 1, and jacks corresponding to the high positions of all the CAN buses and the high positions of the OBD device are located on the other side of the plug connector 1.
With reference to fig. 3, the CAN bus connector further includes a housing 4, the connector 1 and the switching component 2 are disposed in the housing 4, the housing 4 is provided with a window for exposing the roller 3, and the roller 3 is provided with a mark for switching to different CAN buses. Therefore, the roller 3 CAN be rotated or shifted to realize the switching connection of different CAN buses and OBD equipment.
A preferred specific connection of an embodiment of the present invention that enables an OBD device to be connected to a 6-bank CAN bus is described in detail below with reference to fig. 4. Specifically, the illustrated CAN1-CAN6 are from the vehicle wiring harness (i.e., the CAN bus of the vehicle) and the CAN is from the OBD interface. When the roller 3 is shifted to a gear position 'CAN 1', CAN1-L is communicated with CAN-L, CAN1-H is communicated with CAN-H, namely the CAN line of the OBD is directly communicated with the CAN1 bus of the whole vehicle, so that external diagnostic equipment CAN directly diagnose the controller of CAN1 or read data. Similarly, when the roller 3 is turned to a gear position 'CAN 2', CAN2-L is communicated with CAN-L, CAN2-H is communicated with CAN-H, namely, the CAN line of the OBD is directly communicated with the CAN2 bus of the whole vehicle.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (4)
1. The CAN bus diagnosis interface switching device is characterized by comprising a switching assembly and a plug connector used for connecting a whole vehicle wire harness and OBD equipment, wherein the plug connector is provided with a first conductor group and a plurality of groups of second conductor groups, the switching assembly comprises a fixing part and a moving part movably connected with the fixing part, the fixing part is provided with a first conductor and a plurality of second conductors arranged at intervals, the first conductor is connected with the first conductor group, the plurality of second conductors are in one-to-one correspondence with the plurality of groups of second conductor groups and are connected with the second conductor groups, the moving part is provided with a third conductor used for conducting the first conductor and any second conductor, the fixing part comprises a first installation part and a second installation part, the inner diameter of the first installation part is larger than that of the second installation part, the first conductor is arranged on the first installation part, the second conductor is arranged on the second installation part, one end of the third conductor is abutted to the inner side wall of the first installation part, the other end of the third conductor is abutted to the inner side wall of the second installation part, and a groove used for embedding one end of the third conductor is arranged at a position corresponding to the second installation part; the first conductor comprises a first high-position conducting part and a first low-position conducting part, the second conductor comprises a second high-position conducting part and a second low-position conducting part, and the third conductor comprises a third high-position conducting part used for communicating the first high-position conducting part with the second high-position conducting part and a third low-position conducting part used for communicating the first low-position conducting part with the second low-position conducting part;
the first high-position conductive part and the second high-position conductive part are arranged on a first side of the fixing piece, the first low-position conductive part and the second low-position conductive part are arranged on a second side of the fixing piece opposite to the first side, the first lead group and the multiple groups of second lead groups respectively comprise high-position data wires and low-position data wires, the high-position data wires are correspondingly connected with the first high-position conductive part and the second high-position conductive part one by one, and the low-position data wires are correspondingly connected with the first low-position conductive part and the second low-position conductive part one by one;
the middle of the fixed piece is provided with a through hole, and the movable piece is rotatably arranged in the through hole and is coaxial with the fixed piece;
the peripheral surface of the fixing piece is provided with an annular groove communicated with the through hole;
still include the gyro wheel, the gyro wheel cover is established on the moving part and with moving part fixed connection, the gyro wheel inlays to be located in the ring channel.
2. The CAN bus diagnostic interface switching apparatus of claim 1, wherein the stationary member and the movable member are both cylindrical structures, and both axial sides of the movable member and both axial sides of the stationary member are on the same plane, respectively.
3. The CAN bus diagnostic interface switching device of claim 1 or 2, wherein the first conductor and the second conductor are arranged along a circumference of the through hole.
4. The CAN bus diagnostic interface switching apparatus of claim 1, further comprising a housing, the plug and the switch assembly being disposed within the housing, the housing defining a window for exposing the roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005069.3A CN112838973B (en) | 2021-01-04 | 2021-01-04 | CAN bus diagnosis interface switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005069.3A CN112838973B (en) | 2021-01-04 | 2021-01-04 | CAN bus diagnosis interface switching device |
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| Publication Number | Publication Date |
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| CN112838973A CN112838973A (en) | 2021-05-25 |
| CN112838973B true CN112838973B (en) | 2023-01-24 |
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| CN202110005069.3A Active CN112838973B (en) | 2021-01-04 | 2021-01-04 | CAN bus diagnosis interface switching device |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4575849B2 (en) * | 2005-06-14 | 2010-11-04 | ミック電子工業株式会社 | Shift switch |
| JP2008166158A (en) * | 2006-12-28 | 2008-07-17 | Shinmei Electric Co Ltd | Rotary switch |
| JP3142443U (en) * | 2008-04-02 | 2008-06-12 | 強網工業股▲ふん▼有限公司 | Power output device for electric tools |
| AT510379B1 (en) * | 2011-12-12 | 2012-09-15 | Ditest Fahrzeugdiagnose Gmbh | DIAGNOSTIC TOOL FOR CONNECTING TO A VEHICLE DIAGNOSTIC SOCKET |
| DE102017109866A1 (en) * | 2017-05-08 | 2018-11-08 | Webasto SE | OBD adapter |
| CN110094494B (en) * | 2018-01-31 | 2021-10-26 | 长城汽车股份有限公司 | Operating strategy of a gear shifter and gear shifter |
| CN109240968A (en) * | 2018-10-25 | 2019-01-18 | 汽-大众汽车有限公司 | A kind of CAN bus adapter |
| CN110853964A (en) * | 2019-12-23 | 2020-02-28 | 上海伊莱克斯实业有限公司 | Knob type gear switch |
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2021
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