A small oxygen sensor
The oxygen sensor, with its U-shaped barrel groove structure and wedge-shaped constriction design on the shell skirt, solves the problem of insufficient talc block holding force caused by the riveting structure, achieving high sealing performance and low leakage value, thus improving product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DELPHI WANYUAN ENGINE MANAGEMENT SYST CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-10
Smart Images
Figure CN224480443U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts manufacturing, and in particular to oxygen sensors. Background Technology
[0002] Oxygen sensors are essential automotive components in the vehicle manufacturing industry. They are used to detect the oxygen content in the combustion exhaust gas of a car engine, thereby determining the engine's real-time air-fuel ratio. Depending on the oxygen concentration, the sensor outputs different voltage signals to the engine electronic control module (ECM), serving as a crucial basis for the system's closed-loop fuel trim compensation control. Thanks to the application of oxygen sensors, engines can operate at an ideal air-fuel ratio under most conditions, thus achieving good emission characteristics and fuel economy.
[0003] The oxygen sensor uses a multi-layer ceramic element with a planar structure as its base, with a zirconia layer as the core element. The working principle of the zirconia element is equivalent to a simple solid galvanic cell. Existing small oxygen sensors use a riveted structure, which has low holding force on the assembled talc block, resulting in high leakage values. Furthermore, the insulator may crack after riveting. Due to the high leakage value, the oxygen sensor suffers from contamination quality issues during application.
[0004] Therefore, there is an urgent need for a product to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a small oxygen sensor to improve the talc block holding force after product assembly, improve the sealing performance of the oxygen sensor, and thus reduce the leakage value of the small oxygen sensor.
[0006] To achieve the above objectives, this utility model provides a small oxygen sensor, comprising a lower cover, a housing, a housing skirt, a lower insulator, a talc block, an upper insulator, a zirconium element positioning groove, a zirconium element mounting cavity, and a zirconium element. The lower cover has a U-shaped barrel-shaped structure, with the housing welded to the bottom of its inner cavity. The housing includes a lower cover connecting cavity and an insulator assembly cavity that are interconnected. The zirconium element positioning groove of the lower cover is embedded within the lower cover connecting cavity. The lower insulator, talc block, and upper insulator are arranged sequentially from top to bottom within the insulator assembly cavity. Furthermore, interconnected through holes are provided in the middle of the lower insulator, talc block, and upper insulator, forming the zirconium element mounting cavity. The top of the zirconium element is fixed within the zirconium element positioning groove, the middle is fixed within the zirconium element mounting cavity, and the bottom extends beyond the bottom surface of the zirconium element mounting cavity and the housing. The housing skirt is located at the bottom of the housing and is an annular structure. Before the constriction, the outer diameter of this annular structure gradually narrows to a wedge shape at the tip. After the neck is narrowed, the neck bends toward the central axis of the shell.
[0007] As a preferred embodiment, the bending radius of the arc of the shell skirt is approximately 5 millimeters.
[0008] As a preferred method, the bending radius of the housing skirt after the tapered module is press-fitted can be between 4 mm and 7 mm.
[0009] As a preferred method, the lower cover and the housing are connected together by laser welding.
[0010] As a preferred method, the zirconium element positioning groove is a square groove.
[0011] As a preferred method, the zirconium element mounting cavity is a square groove.
[0012] As a preferred method, the talc blocks are crushed by the compression of the upper and lower insulators and then filled into the gaps between the components.
[0013] As a preferred embodiment, the outer diameter of the shell is approximately 25.1 mm.
[0014] As a preferred embodiment, the diameter of the insulator assembly cavity is approximately 10.7 mm.
[0015] As a preferred method, the diameter of the constriction is approximately 7.1 to 9.2 mm.
[0016] The miniature oxygen sensor of this invention features a constricted structure on the skirt of its housing that provides high retention force for the talc block, resulting in a leakage value of less than 0.02ccm@340kpa, effectively overcoming quality problems such as contamination in existing products. Attached Figure Description
[0017] Figure 1 This is a schematic cross-sectional view of the structure of this utility model before the necking.
[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention after the necking is reduced.
[0019] Figure 3 This is a three-dimensional structural diagram of the present invention.
[0020] Figure 4 This is a schematic diagram of the existing technology. Detailed Implementation
[0021] In the following description, embodiments of the oxygen sensor of this invention will be described with reference to the accompanying drawings.
[0022] The embodiments described herein are specific implementations of this utility model, used to illustrate the concept of this utility model, and are illustrative and exemplary, and should not be construed as limiting the embodiments or scope of this utility model. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include any obvious substitutions and modifications made to the embodiments described herein.
[0023] The accompanying drawings in this specification are schematic diagrams used to illustrate the concept of this utility model, and schematically show the shape of each part and their interrelationship.
[0024] Figure 1 This is a schematic cross-sectional view of the structure of this utility model before the necking. Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention after the necking is reduced. Figure 3 This is a three-dimensional structural diagram of the present invention.
[0025] like Figure 1 and Figure 3 As shown, the miniature oxygen sensor of this utility model includes a lower cover 1, a housing 2, a housing skirt 7, a lower insulator 3, a talc block 4, an upper insulator 5, a zirconium element positioning groove 9, a zirconium element 6 mounting cavity, and a zirconium element 6. The lower cover 1 has a U-shaped barrel-shaped structure, with the housing 2 welded to the bottom of its inner cavity. The housing 2 includes a communicating cavity of the lower cover 1 and an insulator assembly cavity 8. The zirconium element positioning groove 9 of the lower cover 1 is fitted into the communicating cavity of the lower cover 1. The lower insulator 3, the talc block 4, and the upper insulator 5 are arranged sequentially from top to bottom in the insulator assembly cavity 8. Furthermore, the lower insulator 3, the talc block 4, and the upper insulator 5 each have interconnected through holes in their middle portions, which constitute the zirconium element 6 mounting cavity. The top of the zirconium element 6 is fixed in the zirconium element positioning groove 9, the middle portion is fixed in the zirconium element 6 mounting cavity, and the bottom extends out of the zirconium element 6 mounting cavity and the bottom surface of the housing 2. The housing skirt 7 is located at the bottom of the housing 2 and has an annular structure. And, as Figure 1 As shown, in this annular structure, before the constriction, the outer diameter of the constriction gradually narrows to a wedge shape at the tip. (As...) Figure 2 As shown, after the necking is completed, the necking bends toward the central axis of the shell 2.
[0026] As a preferred embodiment, the bending radius of the arc of the shell skirt 7 is approximately 5 millimeters.
[0027] As a preferred method, the bending radius of the housing skirt 7 after the tapered module is press-fitted can be between 4 mm and 7 mm.
[0028] As a preferred method, the lower cover 1 and the housing 2 are connected together by laser welding.
[0029] As a preferred embodiment, the zirconium element positioning groove 9 is a square groove.
[0030] As a preferred embodiment, the mounting cavity for the zirconium element 6 is a square groove.
[0031] As a preferred method, the talc block 4 is crushed by the upper and lower insulators 3 and then fills the gaps between the components.
[0032] As a preferred embodiment, the outer diameter of the housing 2 is approximately 25.1 mm.
[0033] As a preferred embodiment, the diameter of the insulator assembly cavity 8 is approximately 10.7 mm.
[0034] As a preferred method, the diameter of the constriction is approximately 7.1 to 9.2 mm.
[0035] The component connection relationship and working process of this utility model are as follows:
[0036] The lower cover 1 and the shell 2 are connected together by laser welding. A square groove is provided in the middle of the lower insulator 3, the talc block 4, and the upper insulator 5. The zirconium element 6 passes through this groove. These four components are placed into the shell 2. A press applies force to the upper and lower insulators 3. The talc block 4 is crushed by the upper and lower insulators 3, and the talc powder fills the gaps between the components. The shell skirt 7, through a narrowing, presses down on the upper insulator 5, thus maintaining the assembled shape of the talc block 4. After the narrowing, the skirt of the shell 2 changes from a straight edge to a beveled edge.
[0037] The lower cover 1 serves as the inlet for the vehicle's exhaust gases to enter the small oxygen sensor. The housing 2 is the mounting interface between the small oxygen sensor and the vehicle's exhaust system. The zirconium element 6 generates an electrical signal based on the oxygen concentration. The upper and lower insulators 3 provide insulation between the zirconium element 6 and the housing 2, and the talc block 4 acts as a seal, preventing exhaust gases inside the lower cover 1 from entering the electrode end of the zirconium element 6.
[0038] Figure 4 This is a schematic diagram of the structure of existing technology. The miniature oxygen sensor of this utility model, if... Figure 4 As shown, if only riveting is used, the holding force of the riveting structure 10 on the talc block 4 is low, and the leakage value will generally be greater than 0.2ccm@340kpa, resulting in a contamination quality problem in the product. The product leakage value was reduced from 0.2ccm@340kpa to 0.02ccm@340kpa, thus solving the quality problem of small oxygen sensors being easily contaminated.
[0039] The miniature oxygen sensor of this invention, such as Figure 2As shown, the constricted structure of its shell skirt 7 provides high retention force for the talc block 4, ensuring a leakage value of less than 0.02 ccm at 340 kPa, effectively overcoming the problem of leakage. Figure 3 The existing products exhibit quality issues such as contamination.
[0040] The oxygen sensor of this invention adopts a brand-new constriction structure, which greatly improves the airtightness of the product, achieving an airtightness level of 0.02ccm@340kpa, which is at a leading level in the automotive parts industry.
[0041] The embodiments of the oxygen sensor of this utility model have been described above, with the aim of explaining the spirit of this utility model. Please note that those skilled in the art can modify and combine the features of the above embodiments without departing from the spirit of this utility model; therefore, this utility model is not limited to the above embodiments. Specific features of the oxygen sensor, such as shape, size, and position, can be specifically designed based on the functions of the features disclosed above, and these designs are all achievable by those skilled in the art. Furthermore, the disclosed technical features are not limited to combinations with other features; those skilled in the art can also make other combinations of technical features according to the purpose of this utility model to achieve its objective.
Claims
1. A small oxygen sensor, characterized in that, It includes a lower protective cover, a housing, a housing skirt, a lower insulator, a talc block, an upper insulator, a zirconium element positioning groove, a zirconium element mounting cavity, and a zirconium element; among which, The lower cover has a U-shaped barrel-shaped structure, and the shell is welded to the bottom of its inner cavity. The housing includes a lower protective cover connecting cavity and an insulator assembly cavity that are interconnected; wherein, The lower protective cover has a zirconium element positioning groove embedded in the connecting cavity; The insulator assembly cavity is provided with a lower insulator, a talc block, and an upper insulator arranged sequentially from top to bottom; and... The lower insulator, the talc block, and the upper insulator are all provided with interconnected through holes in their middle parts, and these through holes constitute the zirconium element mounting cavity; The top of the zirconium element is fixed in the zirconium element positioning groove, the middle part is fixed in the zirconium element mounting cavity, and the bottom extends out of the zirconium element mounting cavity and the bottom surface of the housing; The shell skirt is located at the bottom of the shell and is a ring structure; and before the narrowing, the outer diameter of the narrowing gradually decreases to a wedge shape at the tip; after the narrowing, the narrowing bends toward the central axis of the shell.
2. The miniature oxygen sensor according to claim 1, characterized in that, The curvature of the skirt on the shell is approximately 5 millimeters.
3. The miniature oxygen sensor according to claim 1, characterized in that, The bending radius of the housing skirt after the tapered module is press-fitted can be between 4 mm and 7 mm.
4. The miniature oxygen sensor according to claim 1, characterized in that, The lower protective cover is connected to the housing by laser welding.
5. The miniature oxygen sensor according to claim 1, characterized in that, The positioning groove for the zirconium element is a square groove.
6. The miniature oxygen sensor according to claim 1, characterized in that, The mounting cavity for the zirconium element is a square groove.
7. The miniature oxygen sensor according to claim 1, characterized in that, After being crushed by the upper and lower insulators, the talc blocks filled the gaps between the components.
8. The miniature oxygen sensor according to claim 1, characterized in that, The outer diameter of the shell is approximately 25.1 mm.
9. The miniature oxygen sensor according to claim 1, characterized in that, The diameter of the insulator assembly cavity is approximately 10.7 mm.
10. The miniature oxygen sensor according to claim 1, characterized in that, The diameter of the constriction is approximately 7.1 to 9.2 mm.