Oxygen sensor and wire harness structure thereof
By simplifying the wiring harness structure and sealing materials of the oxygen sensor, the problems of easy breakage of zirconium elements and difficulty in controlling sealing performance were solved, resulting in cost reduction and improved sealing performance.
Patent Information
- Application Number
- CN202423310562.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The wiring harness structure of existing oxygen sensors is prone to causing zirconium elements to break, resulting in high manufacturing costs and difficulty in controlling sealing, leading to internal leakage.
A completely new spring seat structure is adopted, eliminating the cage riveting, simplifying the structure and transferring the force of the zirconium element to the upper cover. At the same time, new sealing materials and curing structures are used to improve the sealing performance.
It effectively prevents zirconium components from breaking, reduces material and process costs, improves sealing performance and service life, and reduces internal leakage.
Smart Images
Figure CN223808377U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of automobile parts production and manufacturing, especially to oxygen sensor. BACKGROUND
[0002] Oxygen sensor is an essential automobile part in vehicle manufacturing industry. It is used to detect the oxygen content in the exhaust pipe of automobile engine, so as to determine the real-time air-fuel ratio state of the engine. According to the different oxygen concentration, the sensor will output different voltage signals to the engine electronic control module (ECM) as an important basis for system closed-loop fuel correction compensation control. Due to the application of oxygen sensor, the engine can work in the ideal air-fuel ratio state under most working conditions, thereby obtaining good emission characteristics and fuel economy.
[0003] Oxygen sensor adopts a flat structure multilayer ceramic element as a basic element, and the zirconia layer is the core element. The working principle of zirconia element is equivalent to a simple solid primary battery. According to the electrochemical principle, there will be a potential difference between the two electrodes due to the difference in oxygen ion concentration. The outer electrode is exposed to the exhaust gas, and the oxygen ion concentration will change according to the different actual working conditions, while the inner electrode is the reference air, and the oxygen ion concentration is constant. When the engine air-fuel ratio is dilute, the oxygen ion concentration in the exhaust gas is relatively high, the oxygen ion concentration difference between the inner and outer electrodes is small, that is, the potential difference is small, and the output voltage signal of the oxygen sensor is close to 0V; on the contrary, when the air-fuel ratio is thick, the oxygen ion concentration in the exhaust gas is relatively low, the oxygen ion concentration difference between the inner and outer electrodes is large, that is, the potential difference is large, and the output voltage of the sensor is close to 1V.
[0004] The current oxygen sensor, switch oxygen and wire oxygen, uses riveting pressure to fix the electrode ceramic and retainer with the upper cover, forming a fixed structure, so as to facilitate automatic assembly, but the defect is that the zirconium element is easy to break, and the manufacturing cost of wire harness is high. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a wire harness structure and an oxygen sensor adopting the wire harness structure, so as to simplify the structure and prevent the zirconium element from breaking, effectively control the internal leakage of the oxygen sensor, and improve the sealing performance.
[0006] In order to achieve the above object, the utility model provides a wire harness structure for oxygen sensor, its characterized in be including upper shield and the electrode porcelain seat, terminal, spring seat, sealing plug and wire contained in the upper shield, the terminal is installed on the electrode porcelain seat, the electrode porcelain seat is supported on the spring seat, the spring seat is supported in the upper shield, the wire is connected the terminal and passes out the sealing plug at the lower end of upper shield, wherein, the upper shield is cylindrical piece, including first cylinder and second cylinder, the diameter of first cylinder is greater than the second cylinder zirconium, thereby the step for supporting the spring seat is formed at the connecting place between first cylinder and second cylinder, the upper end of first cylinder is connected with the upper fastening cylinder body of the shell of probe subassembly of oxygen sensor in the way of close fit with probe subassembly of oxygen sensor, and the upper end of electrode porcelain seat is against the riveting ceramic piece of probe subassembly of oxygen sensor, the spring seat includes annular elastic sheet, center hole and multiple vertical elastic sheets, constitutes the elastic support of containing and supporting the electrode porcelain seat, multiple vertical elastic sheets extend from the inner ring edge of annular elastic sheet to the same direction and are perpendicular to annular elastic sheet, the outer ring edge of annular elastic sheet is supported on the step of upper shield, the number of terminal is four, one end of terminal is spring sheet with contact, the other end is used for fixed wire, and the other end of four terminals is connected four wires respectively, two two terminals are opposite, to clamp and contact zirconium element sufficiently, and the sealing plug has four through holes to allow four wires to pass through.
[0007] As a preferred mode, the number of multiple vertical elastic sheets is 4, and the multiple vertical elastic sheets are evenly distributed along the inner ring edge of the spring seat.
[0008] As a preferred mode, the sealing plug is made of fluorine rubber.
[0009] As a preferred mode, the spring seat is stamped, the multiple vertical elastic sheets are integral with the annular elastic sheet, and are made of the same material.
[0010] As a preferred mode, the electrode porcelain seat has through holes for accommodating the terminals and the wires, and steps of the through holes cooperate with protruding parts of the terminals to support and position the terminals.
[0011] On the other hand, the utility model also provides an oxygen sensor, which comprises the wire harness structure and a probe subassembly.
[0012] As a preferred mode, the probe subassembly comprises a zirconium element, a shell, a ceramic piece, a sealing material and a lower shield, wherein the zirconium element is a long strip with a rectangular cross section, arranged to pass through the shell along the central axis of the shell and the ceramic piece and the sealing material located in the shell; the shell is a U-shaped cylindrical shell, comprising an upper opening, a shell bottom and a cylindrical hollow portion extending from the upper opening to the shell bottom, the outer surface of the shell comprises an upper opening edge, an upper fastening cylinder, a shoulder, a lower connecting threaded cylinder and a lower shield connecting flange connected in sequence along the central axis starting from the upper opening, wherein the shell bottom has a shell bottom plane, the lower shield connecting flange vertically extending along the edge of the shell bottom plane, and a rectangular cross section through hole located on the central axis of the shell for the zirconium element to pass through; the upper fastening cylinder is used to connect the upper shield of the oxygen sensor by tight fit; the lower shield connecting flange is used to connect the lower shield; the outer surface of the lower connecting threaded cylinder has threads for connecting the interface threads of the vehicle exhaust pipe; the sealing material fills the lower part of the cylindrical hollow portion and tightly contacts the surface of the zirconium element and the cylindrical hollow portion; the ceramic piece is located in the upper part of the cylindrical hollow portion and is press-fitted on the sealing material, and the ceramic piece is fixed by riveting the upper opening edge.
[0013] As a preferred mode, the shell bottom further has a shell bottom plane and the lower shield connecting flange vertically extending along the edge of the shell bottom plane; and the lower shield has an outer cylinder and an inner cylinder, the outer cylinder has a flange, the lower shield connecting flange is riveted on the flange of the outer cylinder, and when the lower shield connecting flange is riveted on the flange, the top end of the inner cylinder abuts against the shell bottom plane.
[0014] As a preferred mode, the sealing material is sintered in the lower part of the cylindrical hollow portion.
[0015] As a preferred mode, the maximum gap between the surface of the rectangular through hole and the surface of the zirconium element is 0.1mm.
[0016] The oxygen sensor for detecting oxygen content of automobile exhaust system of the utility model, through detecting oxygen concentration, feedback to the whole vehicle ECU carries out closed loop control correction fuel injection amount, reaches the best emission.
[0017] In one aspect, the wire harness structure of the prior art oxygen sensor adopts a structure that the electrode ceramic and the retainer are fixed and riveted with the upper shield to form a fixed structure, facilitating automatic assembly. However, the structure has the following problems: the stress point is at the zirconium element itself rather than the upper shield, which causes the zirconium element to be easily broken due to uneven stress; in addition, the structure of the wire harness structure of the prior art is complex, and the manufacturing cost of the material is high; and the retainer is riveted, the process is complex, and the manufacturing cost is high. The focus of the utility model is to change the design first, that is, to simplify the structure and process to reduce the manufacturing cost of the wire harness, and to improve the stress distribution of the zirconium element assembly.
[0018] Compared with the prior art, the wire harness structure of the utility model has the following changes: 1. The structure is fundamentally improved, the retainer is cancelled, and a new spring seat is used to simplify the structure and reduce the material cost; 2. The structure is changed, the retainer riveting is cancelled, the manufacturing process is reduced, and the process cost is reduced; 3. The structure is fundamentally improved, the stress of the zirconium element is transferred to the upper shield, and the unbalanced force buffer of the zirconium element is increased, and the overall robustness is increased.
[0019] On the other hand, the oxygen sensor of the prior art, whether heated or not, whether switch type or wide range type, generally uses talcum powder and ceramic insulator to seal by one or more times of pressing. The sealing quality determines the accuracy of the sensor signal, and the current problem is that internal leakage is difficult to control, and the structure is complex and the cost is high. The focus of the utility model is to change the design, that is, to reduce the cost and solve the sealing problem at the same time.
[0020] Compared with the prior art, the oxygen sensor of the utility model can effectively control the internal leakage of the oxygen sensor, has high sealing performance, is not easy to fall off powder, and avoids causing pollution; and the structure is simple, the cost is low, and it is extremely beneficial to product production and market promotion.
[0021] Therefore, the utility model has the following advantages:
[0022] 1. The structure of the product is greatly simplified compared with the prior art, and the material cost is reduced.
[0023] 2. The new sealing material and the new curing structure greatly improve the stability of sealing control and effectively improve the service life of the product. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is a cross-sectional view of the wire harness structure embodiment of the oxygen sensor of the utility model.
[0025] Figure 2 It is an explosion diagram of the wire harness structure embodiment of the oxygen sensor of the utility model.
[0026] Figure 3It is the cross section schematic view of the oxygen sensor embodiment of the utility model.
[0027] Figure 4 It is the cross section schematic view of the upper shield of the wiring harness structure embodiment of the oxygen sensor of the utility model.
[0028] Figure 5 It is the perspective view of the terminal of the wiring harness structure embodiment of the oxygen sensor of the utility model.
[0029] Figure 6 It is the perspective view of the electrode porcelain seat of the wiring harness structure embodiment of the oxygen sensor of the utility model.
[0030] Figure 7 It is the perspective view of the sealing plug of the wiring harness structure embodiment of the oxygen sensor of the utility model.
[0031] Figure 8 It is the perspective view of the spring seat of the wiring harness structure embodiment of the oxygen sensor of the utility model.
[0032] Figure 9 It is the front view of the spring seat of the wiring harness structure embodiment of the oxygen sensor of the utility model.
[0033] Figure 10 It is the cross section schematic view of the probe subassembly embodiment of the oxygen sensor of the utility model.
[0034] Figure 11 It is the perspective view of a part of the probe subassembly embodiment of the oxygen sensor of the utility model, without showing the lower shield and zirconium element.
[0035] Figure 12 It is the cross section schematic view of the shell of the probe subassembly embodiment of the utility model. DETAILED DESCRIPTION
[0036] Hereinafter, the embodiment of the oxygen sensor of the utility model will be described with reference to the accompanying drawings.
[0037] The embodiment described herein is a specific embodiment of the utility model, used to explain the concept of the utility model, and is explanatory and exemplary, and should not be interpreted as limiting the embodiment of the utility model and the scope of the utility model. In addition to the embodiments described herein, those skilled in the art can also employ other technical solutions based on the disclosure of the claims and the specification of the present application, which include any obvious replacement and modification of the embodiments described herein.
[0038] The drawings of the present specification are schematic drawings, which assist in explaining the concept of the utility model, and schematically represent the shape of each part and its mutual relationship.
[0039] Figure 1 It is the cross section view schematic drawing of the wire harness structure embodiment of the oxygen sensor of the utility model. Figure 2 It is the explosion drawing of the wire harness structure embodiment of the oxygen sensor of the utility model. Figure 3 It is the cross section view schematic drawing of the oxygen sensor embodiment of the utility model. Figures 4-9 The parts drawing of the upper shield, terminal, electrode porcelain seat, sealing plug and spring seat is shown respectively.
[0040] As shown in Figure 3 The oxygen sensor of the utility model includes probe sub-assembly and wire harness structure.
[0041] Referring to 1 and 2, the wire harness structure of the oxygen sensor of the utility model includes upper shield 5 and electrode porcelain seat 1, terminal 2, spring seat 3, sealing plug 4 and wire 6 contained in the upper shield 5.
[0042] Terminal 2 is installed on electrode porcelain seat 1, electrode porcelain seat 1 is supported on spring seat 3, spring seat 3 is supported in upper shield 5, wire 6 is connected with terminal 2 and passes through sealing plug 4 at the lower end of upper shield 5.
[0043] Upper shield 5 is a cylindrical part, including first cylinder and second cylinder, the diameter of the first cylinder is larger than that of the second cylinder, thereby forming a step for supporting spring seat 3 at the connecting part between the first cylinder and the second cylinder.
[0044] The upper end of the first cylinder is connected in a tightly fitted manner with the upper fastening cylinder body of the shell of the probe sub-assembly, and the upper end of the electrode porcelain seat 1 abuts against the riveted ceramic part of the probe sub-assembly of the oxygen sensor.
[0045] Spring seat 3 includes annular elastic sheet, center hole and four vertical elastic sheets, constituting the elastic support for containing and supporting the electrode porcelain seat 1, the four vertical elastic sheets extend from the inner ring edge of the annular elastic sheet in the same direction and are perpendicular to the annular elastic sheet, and the outer ring edge of the annular elastic sheet is supported on the step of the upper shield 5.
[0046] The number of the four vertical elastic sheets is uniformly distributed along the inner ring edge of the spring seat 3. Although the embodiment shows four vertical elastic sheets, those skilled in the art can know that the number of the vertical elastic sheets can be set as needed, for example, it can be two, three, six, eight, etc.
[0047] Spring seat 3 can be punched, and the four vertical elastic sheets are integral with the annular elastic sheet and are of the same material. Of course, spring seat 3 can also be made in other ways, for example, injection molding.
[0048] The sealing plug 4 is made of fluorine rubber or silicon rubber to resist high temperature, and is preferably made of fluorine rubber.
[0049] The number of the terminals 2 is four, one end of each terminal 2 is a spring piece with a contact, the spring piece is arc-shaped, and the other end is used for fixing the wire 6, and the four terminals 2 are connected to the four wires 6 respectively.
[0050] Two of the four wires 6 are used for heating the zirconium element, and the other two wires 6 are used for transmitting signals.
[0051] The electrode porcelain seat 1 has a through hole for accommodating the terminal 2 and the wire 6, and the step of the through hole matches the protruding part of the terminal 2 to support and position the terminal 2.
[0052] The wire harness structure of the utility model adopts a brand-new spring seat, simplifies the structure, and reduces the material cost; the retainer riveting pressure is cancelled, the manufacturing process is reduced, and the process cost is reduced; in addition, the structure is fundamentally improved, the stress of the zirconium element is transferred to the upper protective cover, the unbalanced force buffer of the zirconium element is increased, and the overall robustness is increased.
[0053] Figure 10 It is a cross-sectional schematic view of the probe subassembly embodiment of the oxygen sensor of the utility model. Figure 11 It is a perspective structural schematic view of a part of the probe subassembly embodiment of the oxygen sensor of the utility model, and the lower protective cover and the zirconium element are not shown. Figure 12 It is a cross-sectional schematic view of the shell of the probe subassembly embodiment of the utility model.
[0054] As shown in Figure 10 , 11 and 12, the probe subassembly embodiment of the oxygen sensor of the utility model comprises a shell 7, a sealing material 8, a ceramic piece 9, a zirconium element 10 and a lower protective cover 13. Figure 12 As shown in
[0055] The zirconium element 10 is a long strip with a rectangular cross section, and is arranged to pass through the shell 7 along the central axis of the shell 7 and the ceramic piece 9 and the sealing material 8 in the shell 7.
[0056] The housing 7 is a U-shaped cylindrical housing, comprising an upper opening 16, a housing bottom, and a cylindrical hollow portion extending from the upper opening 16 to the housing bottom, the outer surface of the housing 7 comprises, in order along the central axis, starting from the upper opening 16, an upper opening edge, an upper fastening cylinder, a shoulder 11, a lower connecting threaded cylinder, and a lower shield connecting flange 141. Note that these parts of the outer surface of the housing 7 are connected in order, without spacing.
[0057] The housing bottom has a housing bottom plane 14, a lower shield connecting flange 141, and a through hole 17. The lower shield connecting flange 141 extends vertically along the edge of the housing bottom.
[0058] The through hole 17 is located on the central axis of the housing 7, and the cross section of the through hole 17 is rectangular, for the zirconium element 10 to pass through. The maximum gap between the four surfaces of the rectangular through hole 17 and the corresponding four surfaces of the zirconium element 10 is 0.1 mm.
[0059] Referring again to Figure 10 , the lower shield 13 has an outer cylinder 13-1 and an inner cylinder 13-2, and the outer cylinder 13-1 has a flange. The lower shield connecting flange 141 is used to connect the lower shield 13, and the lower shield 13 and the housing 7 are connected by riveting the lower shield connecting flange 141 on the flange of the outer cylinder 13-1. When the lower shield connecting flange 141 is riveted on the flange of the outer cylinder 13-1, the top end of the inner cylinder 13-2 abuts against the housing bottom plane 14. It is preferable to rivet the lower shield connecting flange 141 entirely on the flange of the outer cylinder 13-1, so that first, it ensures that the gas enters from the opening of the lower shield, rather than leaking from the gap; second, it makes the fixation more secure.
[0060] Referring again to Figure 3 , the upper fastening cylinder is used to connect the upper shield 5 of the oxygen sensor by a tight fit.
[0061] The outer surface of the lower connecting threaded cylinder has threads for connecting the interface threads of the exhaust pipe of the vehicle. In this embodiment, the threads of the outer surface of the lower connecting threaded cylinder extend along the entire length of the lower connecting threaded cylinder, and have a tool withdrawal groove.
[0062] The sealing material 8 fills the lower part of the cylindrical hollow portion, tightly contacting the zirconium element 10 and the surface of the cylindrical hollow portion.
[0063] The ceramic piece 9 is located in the upper part of the cylindrical hollow portion, and is press-fitted on the sealing material 8, and the ceramic piece 9 is fixed by riveting the upper opening edge. It is preferable to rivet the upper opening edge entirely on the ceramic piece 9, so that the fixation of the part is tight, and if distributed rivets are used, the part is likely to loosen.
[0064] In addition to leaving a margin of the upper opening edge for press-fitting the ceramic piece 9, the ceramic piece 9 and the sealing material 8 fill the cylindrical hollow portion. The sealing material 8 occupies most of the space of the cylindrical hollow portion, and the ceramic piece 9 only occupies a small part of the space of the cylindrical hollow portion. The height of the sealing material 8 accounts for, for example, five-sixths, four-fifths, etc. of the height of the cylindrical hollow portion, and the height of the ceramic piece 9 accounts for, for example, one-sixth, one-fifth, etc. of the height of the cylindrical hollow portion.
[0065] In this embodiment, the shaft shoulder 11 is hexagonal. The shaft shoulder 11 is used for mounting and rotating the probe sub-assembly, and can also be quadrangular or pentagonal, or circular, and can also be knurled on the surface.
[0066] The sealing material 8 is formed in the lower part of the cylindrical hollow portion by sintering.
[0067] The proportions of the sealing material 8 are as follows:
[0068] 1. 30% to 50% talc powder, the main component of talc powder being magnesium silicate, as the main material of the sealing material 8;
[0069] 2. 30% to 50% glass powder, the softening temperature of the glass powder being 600-700℃, which fuses the talc powder together and improves the airtightness.
[0070] 3. 10% to 15% magnesium stearate, which is used as a lubricant to facilitate the flow and granulation of the powder during the preparation of the powder.
[0071] The preparation process of the sealing material 8 is as follows:
[0072] The talc powder, glass powder and magnesium stearate are weighed according to the determined proportions, and the mixture of these powders is placed in a stirrer and stirred uniformly with an appropriate amount of pure water. Then, the uniformly stirred mixture is placed in an oven for drying. After drying, the sealing material 8 is kept with 5% moisture, and is granulated with a 80-mesh or 100-mesh screen.
[0073] The assembly of the probe sub-assembly of the utility model comprises the following steps:
[0074] First, the zirconium element 10 is taken;
[0075] Secondly, the zirconium element 10 is placed in the shell 7;
[0076] Then, an appropriate amount of granulated sealing material 8 is injected;
[0077] Thirdly, the ceramic piece 9 is press-fitted: the ceramic piece 9 is press-fitted to a fixed position and is riveted and packaged, that is, the edge of the opening 16 of the central cylindrical cavity of the shell 7 is riveted and packaged, so as to fix the ceramic piece 9;
[0078] Finally, sintering solidification: the press-fitted oxygen sensor probe subassembly is placed into a high-temperature furnace, heated to 650-700 DEG C, and kept for 20-60 min, and then cooled with the furnace. Please note that the sintering holding time can be preferably 20 min, 30 min, 40 min, but should not be less than 20 min, because in production, generally, batch production is adopted, and there is a heat radiation process in sintering, and the minimum time guarantees heat penetration for the sintered parts.
[0079] The leakage of the oxygen sensor of the utility model and the oxygen sensor of the prior art is compared through test, and the steps are as follows:
[0080] 1. The oxygen sensor probe subassembly press-fitted by the existing talc block is taken as a comparison piece, the leakage value is measured, and the value is recorded.
[0081] 2. The sealing material 8 is taken, the zirconium element 10 is loaded into the shell 7, the sealing material 8 is filled and compacted, the ceramic piece 9 is loaded into the shell 7, and the press-fitting and riveting are carried out, the leakage value is measured, and the value is recorded.
[0082] 3. The oxygen sensor of the prior art is assembled, the leakage value is measured, and the value is recorded.
[0083] 4. The assembled comparison piece and test piece are placed into a high-temperature furnace, kept at 650 DEG C for 30 min (high temperature and keeping, simulating high temperature in actual vehicle test), and then cooled to room temperature with the furnace, and then the leakage values of the comparison piece and the test piece are measured and recorded.
[0084] The results of the comparison test are as follows:
[0085]
[0086] As can be seen from the test results, the leakage value of the talc block of the oxygen sensor of the prior art increases by 0.07-0.08 cc after high-temperature sintering, and increases by about 40%. The leakage value of the sealing structure and the sealing material 8 of the oxygen sensor of the utility model decreases by 0.05-0.06 cc after high-temperature sintering, and is reduced by about 25% compared with the prior art. Therefore, the oxygen sensor of the utility model has a positive effect on improving the leakage rate.
[0087] Meanwhile, the sealing structure of the oxygen sensor of the utility model is improved, the number of parts is effectively reduced, and the production cost is greatly reduced.
[0088] The oxygen sensor of the utility model can effectively control the internal leakage of the oxygen sensor, has high sealing performance, is not easy to fall off powder, and avoids causing pollution. In addition, the oxygen sensor of the utility model has the advantages of simple structure, low cost, and is extremely beneficial to product production and market promotion.
[0089] Compared with the prior art, the utility model has the following advantages:
[0090] 1. The structure of the product is greatly simplified compared with the prior art, and the material cost is reduced.
[0091] 2. The new sealing material 8 and the new curing structure greatly improve the stability of the sealing control and effectively improve the service life of the product.
[0092] The above describes the embodiments of the oxygen sensor of the present application, and the purpose is to explain the spirit of the present application. Please note that those skilled in the art can modify and combine the features of the above embodiments without departing from the spirit of the present application, therefore, the present application is not limited to the above embodiments. The specific features of the oxygen sensor such as shape, size and position can be designed according to the functions of the above disclosed features, and these designs can be realized by those skilled in the art. Moreover, the above disclosed technical features are not limited to the disclosed combinations with other features, and those skilled in the art can also make other combinations between technical features according to the purpose of the present application, and the purpose of the present application is achieved.
Claims
1. A wiring harness structure for an oxygen sensor, characterized by, The upper shield and the electrode porcelain holder, the terminal, the spring seat, the sealing plug and the wire, The terminal is mounted on the electrode porcelain holder, the electrode porcelain holder is supported on the spring seat, the spring seat is supported in the upper shield, the wire connects the terminal and passes through the sealing plug at the lower end of the upper shield, wherein The upper shield is a cylindrical member, comprising a first cylinder and a second cylinder, the diameter of the first cylinder is larger than that of the second cylinder, thereby forming a step between the first cylinder and the second cylinder for supporting the spring seat; The upper end of the first cylinder is connected with the upper fastening cylinder of the shell of the probe subassembly in a close fit manner, and the upper end of the electrode porcelain holder abuts against the riveted ceramic piece of the probe subassembly of the oxygen sensor; The spring seat comprises a ring-shaped elastic sheet, a central hole and a plurality of vertical elastic sheets, constituting an elastic support for accommodating and supporting the electrode porcelain holder, the plurality of vertical elastic sheets extend from the inner ring edge of the ring-shaped elastic sheet in the same direction and are perpendicular to the ring-shaped elastic sheet, and the outer ring edge of the ring-shaped elastic sheet is supported on the step of the upper shield; The number of the terminals is four, one end of the terminal is a spring sheet with a contact, the other end is used for fixing the wire, and the other end of the four terminals is connected with the four wires respectively; the terminals are opposite to each other to clamp and fully contact the zirconium element; and The sealing plug has four through holes to allow the four wires to pass through.
2. The wire harness structure according to claim 1, wherein The number of the plurality of vertical elastic sheets is four, which are uniformly distributed along the inner ring edge of the spring seat.
3. The wire harness structure according to claim 1, wherein The sealing plug is made of fluorine rubber.
4. The wire harness structure according to claim 1, wherein The spring seat is stamped, the plurality of vertical elastic sheets are integral with the ring-shaped elastic sheet and are made of the same material.
5. The wire harness structure according to claim 1, wherein The electrode porcelain holder has through holes for accommodating the terminals and the wires, and the steps of the through holes cooperate with the protruding parts of the terminals to support and position the terminals.
6. An oxygen sensor characterized by comprising: The probe subassembly and the wire harness structure according to any one of claims 1-5.
7. The oxygen sensor according to claim 6, wherein The probe subassembly comprises a zirconium element, a shell, a ceramic piece, a sealing material and a lower shield, wherein The zirconium element is a long strip with a rectangular cross section, arranged to pass through the shell along the central axis of the shell and the ceramic piece and the sealing material in the shell; The shell is a U-shaped cylindrical shell, comprising an upper opening, a shell bottom and a cylindrical hollow part extending from the upper opening to the shell bottom, and the outer surface of the shell comprises an upper opening edge, an upper fastening cylinder, a shoulder, a lower connecting threaded cylinder and a lower shield connecting flange connected in sequence along the central axis from the upper opening, wherein The bottom of the shell has a bottom plane, the lower shield connecting flange vertically extending along the edge of the bottom plane, and an oblong through hole on the central axis of the shell for the zirconium element to pass through; The upper fastening cylinder is used to connect the upper shield of the oxygen sensor by tight fit; The lower shield connecting flange is used to connect the lower shield; The outer surface of the lower connecting threaded cylinder is threaded for connecting the interface thread of the vehicle exhaust pipe; The sealing material fills the lower part of the cylindrical hollow part and tightly contacts the surface of the zirconium element and the cylindrical hollow part; The ceramic part is located in the upper part of the cylindrical hollow part, is press-fitted on the sealing material, and is fixed by riveting the upper opening edge.
8. The oxygen sensor according to claim 7, wherein The bottom of the shell has a bottom plane and the lower shield connecting flange vertically extending along the edge of the bottom plane; and The lower shield has an outer cylinder and an inner cylinder, the outer cylinder has a flange, the lower shield connecting flange is riveted on the flange of the outer cylinder, and the top end of the inner cylinder abuts against the bottom plane when the lower shield connecting flange is riveted on the flange.
9. The oxygen sensor according to claim 7, wherein The sealing material is sintered in the lower part of the cylindrical hollow part.
10. The oxygen sensor according to claim 7, wherein The maximum gap between the surface of the oblong through hole and the surface of the zirconium element is 0.1 mm.