Oil level sensor with good sealing performance

Abstract

The utility model relates to the field of oil level sensors, in particular to an oil level sensor with good sealing performance, which comprises a framework, a plug sealed on the framework, an outer rocker arm rotatably connected on the framework, a floater component fixed on the outer rocker arm, a first sealing ring arranged between the outer rocker arm and the framework, and an inner rocker arm connected with the inner rocker arm. A reed assembly is fixed to the inner rocker arm and connected with a resistor disc, the resistor disc is connected with a terminal wiring harness assembly, the part, in the framework, of the terminal wiring harness assembly is connected with the framework in an injection molding mode, the framework is connected with a cover plate, and a first sealing ring is arranged between the outer rocker arm and the framework, so that the outer rocker arm and the framework which are rotationally connected are well sealed; according to the oil level sensor, the terminal wire harness assembly and the framework are connected in an injection molding mode, the sealing performance in the framework is further improved, fuel oil is well prevented from entering the framework to damage parts in the framework through the double-layer arrangement, and the oil level sensor can be suitable for fuel oil with the high ethanol content.

Description

Technical Field

[0001] The utility model relates to the field of oil level sensors, in particular to an oil level sensor with good sealing performance. Background Technique

[0002] The oil level sensor of an automobile is a device capable of detecting the oil quantity in the fuel tank. It usually consists of a sensitive element and a conversion element, and can sense the engine oil level and convert it into an available signal. The working principle of the oil level sensor is based on different technologies, including the principle of controlling the on-off of the reed switch contacts by the magnetic field generated by ferrite magnets, and detecting the oil level by the change in the capacitance between the sensor housing and the induction electrode after the oil enters the container.

[0003] The patent with the application number CN202011576575.X discloses an oil level sensor. The rocker arm assembly of this oil level sensor consists of a rocker arm cover, a rocker arm, a retaining ring and two magnets. In this way, when the oil level sensor is placed in the fuel tank for a long time, the fuel is very easy to seep into the inside of the skeleton and damage the components inside the skeleton. Especially for fuels with a high ethanol content, once the fuel with a high ethanol content seeps into the inside of the skeleton, it is very easy to corrode the components inside the skeleton, thereby causing the oil level sensor to not work properly, increasing the cost of maintenance or replacement, and at the same time causing great potential safety hazards. Therefore, there is an urgent need for an oil level sensor with good sealing performance and long service life. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide an oil level sensor with good sealing performance, which solves the problems existing in the prior art. The utility model seals a first sealing ring between the outer rocker arm and the skeleton, and seals the rotationally connected outer rocker arm and the skeleton well. By injection molding the terminal wire harness assembly and the skeleton, the sealing performance inside the skeleton is further improved. Through this double-layer setting, it is well prevented that the fuel enters the inside of the skeleton and damages the components inside the skeleton. This oil level sensor can be applied to fuels with a very high ethanol content, has a long service life and high safety performance.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the utility model provides the following technical solutions: An oil level sensor with good sealing performance, including a skeleton, a plug is sealed on the skeleton, an outer rocker arm is rotationally connected to the skeleton, a float assembly is fixed on the outer rocker arm, a first sealing ring is arranged between the outer rocker arm and the skeleton, the outer rocker arm is connected to an inner rocker arm, a reed assembly is fixed on the inner rocker arm, the reed assembly is connected to a resistance sheet, the resistance sheet is connected to a terminal wire harness assembly, the part of the terminal wire harness assembly inside the skeleton is injection-molded and connected to the skeleton, and a cover plate is connected to the skeleton.

[0008] Preferably, the terminal wire harness assembly includes terminals connected to the resistor sheet. There are three terminals, and wire harnesses are connected to the lower ends of the terminals.

[0009] Preferably, the terminal includes a wire harness connection part connected to the wire harness. The upper end of the wire harness connection part is fixed to the lower end of the chain belt connection part. The upper end of the chain belt connection part is fixed to the lower end of the bending part. The upper end of the bending part is fixed to the support part. The end of the support part is fixed with a limiting part extending towards the resistor sheet. A ceramic plate is arranged between the support part and the limiting part.

[0010] Preferably, the wire harness connection part includes an annular wrapping part fixedly connected to the chain belt connection part. The lower end of the annular wrapping part is fixed with a semi-annular support part. Two mutually staggered arc-shaped clamping parts are fixed on the bottom surface of the semi-annular support part.

[0011] Preferably, the outer rocker arm includes an outer rocker arm body and a rotating shaft fixedly connected to the outer rocker arm body. The rotating shaft includes a first rotating shaft. A second rotating shaft is fixedly connected to the first rotating shaft. A connection part connected to the inner rocker arm is fixed to the second rotating shaft. A first through hole matching the first rotating shaft is arranged on the skeleton. The diameter of the first rotating shaft is larger than that of the second rotating shaft. A first sealing ring is sleeved on the second rotating shaft.

[0012] Preferably, the first sealing ring includes a dynamic sealing part sleeved on the second rotating shaft. A static sealing part is fixed to the dynamic sealing part.

[0013] Preferably, the float assembly includes a float. One end of a float link is fixed to the float, and the other end of the float link is fixed to the outer rocker arm.

[0014] Preferably, a reed assembly is riveted to the inner rocker arm through a rivet.

[0015] Preferably, lubricating oil is injected into the skeleton.

[0016] Preferably, the part of the float link fixed to the skeleton is arranged as an L-shaped link. A blind hole is opened inwards in the rotating shaft. A cross bar of the L-shaped link is fixed in the blind hole. The vertical bar of the L-shaped link is stuck in a plurality of arc-shaped limiting blocks arranged on the outer rocker arm body in a staggered manner.

[0017] (III) Beneficial effects

[0018] 1. The utility model seals the rotatably connected outer rocker arm and the skeleton well by arranging a first sealing ring between the outer rocker arm and the skeleton, which effectively prevents fuel from entering the interior of the skeleton and damaging components such as the reed assembly, resistor sheet, and terminal wire harness assembly inside the skeleton. When injection molding, the terminal wire harness assembly inside the skeleton is directly injection molded together with the skeleton, which further improves the sealing performance inside the skeleton. If the terminal wire harness assembly and the skeleton are not injection molded together, through holes for the terminal wire harness assembly to pass through must be opened on the skeleton, which will lead to the situation of external fuel seeping into the interior of the skeleton and poor sealing performance. However, this problem is well solved by the method of injection molding the skeleton and the terminal wire harness assembly in advance, greatly improving the sealing performance inside the skeleton. The oil level sensor in the utility model can be applied to ethanol fuel above E85, with a long service life and high safety performance;

[0019] 2. The utility model sets the first sealing ring to be composed of a dynamic sealing part and a static sealing part. The static sealing part is in interference fit with the inner wall of the first through hole to achieve good sealing with the inner wall of the first through hole. The inner wall of the dynamic sealing part is in interference fit with the second rotating shaft. In this way, when the second rotating shaft rotates along the inner ring of the dynamic sealing part, good sealing between the two is also achieved. The double-layer sealing effectively blocks fuel from seeping into the interior of the skeleton and damaging the components inside the skeleton. Lubricating grease is applied to the part of the second rotating shaft in contact with the first sealing ring, which greatly reduces the rotation resistance of the second rotating shaft and facilitates the normal rotation of the second rotating shaft;

[0020] 3. By filling lubricating oil in the skeleton, the utility model greatly reduces the wear of the components inside the skeleton during the working process, changes from the traditional dry-type oil level sensor to a wet-type oil level sensor, well protects the oil level sensor, and greatly increases the service life of the oil level sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall schematic diagram of the utility model.

[0022] Figure 2 For the utility model Figure 1 is the disassembly diagram after removing the float assembly.

[0023] Figure 3 is the disassembly schematic diagram of the skeleton and the plug of the utility model.

[0024] Figure 4 For the utility model Figure 1 is the schematic diagram after removing the float assembly, skeleton, and cover plate.

[0025] Figure 5 is the schematic diagram of the skeleton and the terminal wire harness assembly of the utility model.

[0026] Figure 6 This is a schematic diagram of the terminal wire harness assembly of the present utility model.

[0027] Figure 7 This is a schematic diagram of the terminal of the present utility model.

[0028] Figure 8 This is a schematic diagram of the wire harness connection part of the present utility model.

[0029] Figure 9 This is an overall schematic diagram of the outer rocker arm of the present utility model.

[0030] Figure 10 This is an overall schematic diagram of the outer rocker arm of the present utility model

[0031] Figure 11 This is an overall schematic diagram of the first sealing ring of the present utility model.

[0032] Figure 12 This is an overall schematic diagram of the float assembly of the present utility model.

[0033] Figure 13 This is a schematic diagram of the inner rocker arm and reed assembly of the present utility model.

[0034] Figure 14 This is an overall schematic diagram of the float connecting rod of the present utility model.

[0035] Figure 15 This is a schematic diagram of the L-shaped connecting rod of the present utility model.

[0036] Figure 16 This is a schematic diagram of the outer rocker arm of the present utility model.

[0037] In the figure: 1 - skeleton, 2 - plug, 3 - outer rocker arm, 4 - float assembly, 5 - first sealing ring, 6 - inner rocker arm, 7 - reed assembly, 8 - resistance sheet, 9 - terminal wire harness assembly, 10 - cover plate, 11 - terminal, 12 - wire harness, 13 - wire harness connection part, 14 - chain belt type connection part, 15 - bending part, 16 - support part, 17 - limiting part, 18 - ceramic plate, 19 - annular wrapping part, 20 - semi-circular support part, 21 - arc-shaped clamping part, 22 - outer rocker arm body, 23 - rotating shaft, 24 - first rotating shaft, 25 - second rotating shaft, 26 - connection part, 27 - first through hole, 28 - dynamic sealing part, 29 - static sealing part, 30 - float, 31 - float connecting rod, 32 - rivet, 33 - L-shaped connecting rod, 34 - blind hole, 35 - cross bar, 36 - vertical bar, 37 - arc-shaped limiting block. Detailed implementation manners

[0038] Next, the appendix in the embodiments of the present utility model will be combined Figure 1-16The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] The present invention provides a technical solution: an oil level sensor with good sealing performance, including a skeleton 1, a plug 2 is sealed on the skeleton 1, and an outer rocker arm 3 is rotatably connected to the skeleton 1. A float assembly 4 is fixed on the outer rocker arm 3. A first sealing ring 5 is provided between the outer rocker arm 3 and the skeleton 1. The outer rocker arm 3 is connected to an inner rocker arm 6. A reed assembly 7 is fixed on the inner rocker arm 6. The reed assembly 7 is connected to a resistance sheet 8. The resistance sheet 8 is connected to a terminal wire harness assembly 9. The part of the terminal wire harness assembly 9 inside the skeleton 1 is injection-molded and connected to the skeleton 1. A cover plate 10 is connected to the skeleton 1. During operation, the oil level sensor is placed in the fuel tank. As the automotive fuel is consumed, the float assembly 4 will drop accordingly, and during the dropping process, it drives the outer rocker arm 3 to rotate, thereby driving the rotation of the inner rocker arm 6, further driving the rotation of the reed assembly 7, and then changing the position of the reed assembly 7 on the resistance sheet 8, thereby changing the resistance value. The change in the resistance value is converted into a change in the potential signal through the terminal wire harness assembly 9. The potential signal is reflected on the oil level gauge and converted into the scale on the oil level gauge according to a certain ratio. Among them, the terminal wire harness assembly 9 is connected to an oil level gauge. The present invention sets a first sealing ring 5 between the outer rocker arm 3 and the skeleton 1, which seals the rotatably connected outer rocker arm 3 and the skeleton 1 well, and effectively prevents fuel from entering the inside of the skeleton 1 and damaging the reed assembly 7, the resistance sheet 8, the terminal wire harness assembly 9, etc. inside the skeleton 1. During injection molding, the part of the terminal wire harness assembly 9 inside the skeleton 1 is directly injection-molded together with the skeleton 1. This setting further improves the sealing performance inside the skeleton 1. If the terminal wire harness assembly 9 and the skeleton 1 are not injection-molded together, through holes for the terminal wire harness assembly 9 to pass through will inevitably be opened on the skeleton 1, and in this case, there will be a situation where external fuel seeps into the inside of the skeleton 1, and the sealing performance is poor. However, this problem is well solved by the method of injection-molding the skeleton 1 and the terminal wire harness assembly 9 in advance, greatly improving the sealing performance inside the skeleton 1. Among them, the plug 2 is welded and sealed to the skeleton 1 by ultrasonic waves to further improve the sealing performance. Among them, the cover plate 10 is fixed to the skeleton 1 by laser welding. The oil level sensor in the present invention can be applied to ethanol fuel above E85, with a long service life and high safety performance.

[0040] The terminal wire harness assembly 9 includes terminals 11 connected to the resistance sheet 8. There are three terminals 11. The lower ends of the terminals 11 are connected to a wire harness 12. One of them is grounded, which can ground the fuel to prevent static electricity from causing a fire and improve the use safety.

[0041] Terminal 11 includes a wire harness connection part 13 connected to the wire harness 12. The upper end of the wire harness connection part 13 is fixed to the lower end of the chain belt connection part 14. The upper end of the chain belt connection part 14 is fixed to the lower end of the bending part 15. The upper end of the bending part 15 is fixed to the support part 16. The end of the support part 16 is fixed with a limiting part 17 extending towards the resistance sheet 8. A ceramic plate 18 is arranged between the support part 16 and the limiting part 17. Among them, the support part 16 of the middle terminal 11 is in a straight plate shape, and the support parts 16 of the terminals 11 on both sides are in a symmetric right-angled shape, and the support part 16 in the middle is higher than the support parts 16 on both sides, so as to limit and fix the ceramic plate 18 well. Among them, the bending part 15 plays a role in redirecting, the chain belt connection part 14 plays a role in improving the injection molding effect, and the wire harness connection part 13 plays a role in connecting with the wire harness 12.

[0042] The wire harness connection part 13 includes an annular wrapping part 19 fixedly connected to the chain belt connection part 14. The lower end of the annular wrapping part 19 is fixed with a semi-circular support part 20. Two mutually staggered arc-shaped clamping parts 21 are fixed on the bottom surface of the semi-circular support part 20. Among them, the wire harness connection part 13 with this structure is more firmly fixed to the wire harness 12, and at the same time, the fixing firmness after injection molding is also greatly improved.

[0043] The outer rocker arm 3 includes an outer rocker arm body 22 and a rotating shaft 23 fixedly connected to the outer rocker arm body 22. The rotating shaft 23 includes a first rotating shaft 24. A second rotating shaft 25 is fixedly connected to the first rotating shaft 24. A connecting part 26 connected to the inner rocker arm 6 is fixed on the second rotating shaft 25. A first through hole 27 matching the first rotating shaft 24 is provided on the skeleton 1. The diameter of the first rotating shaft 24 is larger than the diameter of the second rotating shaft 25. A first sealing ring 5 is sleeved on the second rotating shaft 25. Among them, the diameter of the first rotating shaft 24 is equal to the diameter of the first through hole 27, so that the first through hole 27 can be filled to the greatest extent without affecting the rotation of the first rotating shaft 24. Among them, the diameter of the first rotating shaft 24 is set to be larger than the diameter of the second rotating shaft 25, so that the first sealing ring 5 can be sleeved on the second rotating shaft 25, and the first sealing ring 5 can be set to a relatively thick thickness, so that the sealing effect is better. Among them, the first sealing ring 5 is in interference fit with the inner wall of the first through hole 27.

[0044] The first sealing ring 5 includes a dynamic sealing portion 28 sleeved on the second rotating shaft 25. A static sealing portion 29 is fixed on the dynamic sealing portion 28. The static sealing portion 29 is in interference fit with the inner wall of the first through hole 27, achieving good sealing with the inner wall of the first through hole 27. The inner wall of the dynamic sealing portion 28 is in interference fit with the second rotating shaft 25. In this way, when the second rotating shaft 25 rotates along the inner ring of the dynamic sealing portion 28, good sealing between the two is also achieved. Through the double-layer sealing of the first sealing ring 5, fuel infiltration into the interior of the skeleton 1 is well blocked.

[0045] The float assembly 4 includes a float 30. One end of a float link 31 is fixed to the float 30, and the other end of the float link 31 is fixed to the outer rocker arm 3. The float 30 is used to sense the change in the oil level. When the float 30 changes with the change in the oil level, it will drive the float link 31 to change accordingly, and drive the outer rocker arm 3 to rotate through the float link 31.

[0046] A reed assembly 7 is riveted to the inner rocker arm 6 by a rivet 32. The reed assembly 7 is composed of two five-finger brush pieces.

[0047] The skeleton 1 is filled with lubricating oil. When grease needs to be added, remove the plug 2 and add it. The plug 2 has no mold clamping line on the upper and lower molds. The amount of grease added needs to exceed the upper edge of the resistance piece 8 by about 4 g. After adding the grease, plug the plug 2 back. By filling lubricating oil in the skeleton 1, the wear of the components in the skeleton 1 during the working process is greatly reduced. It changes from a traditional dry oil level sensor to a wet oil level sensor, provides good protection for the oil level sensor, and greatly increases the service life of the oil level sensor.

[0048] The part of the float link 31 fixed to the skeleton 1 is set as an L-shaped link 33. A blind hole 34 is opened inward in the rotating shaft 23, and a cross bar 35 of the L-shaped link 33 is fixed in the blind hole 34. The vertical bar 36 of the L-shaped link 33 is stuck in a plurality of arc-shaped limit blocks 37 staggered on the outer rocker arm body 22. The setting of the L-shaped link 33 greatly facilitates the float link 31 to drive the outer rocker arm 3 to rotate. The blind hole 34 and the staggered arc-shaped limit blocks 37 provide good limitation and fixation for the L-shaped link 33, thereby ensuring the accuracy of the entire oil level sensor.

[0049] Working principle: During operation, the fuel level sensor is placed inside the fuel tank. As the vehicle fuel is consumed, the float assembly 4 will descend accordingly. During the descent process, it drives the outer rocker arm 3 to rotate, which in turn drives the rotation of the inner rocker arm 6, and further drives the rotation of the reed assembly 7, thereby changing the position of the reed assembly 7 on the resistance sheet 8, and further changing the resistance value. The change in the resistance value is converted into a change in the potential signal through the terminal wire harness assembly 9, and the potential signal is reflected on the fuel level gauge and converted into the scale on the fuel level gauge according to a certain ratio. Among them, the terminal wire harness assembly 9 is connected to the fuel level gauge. In the present utility model, a first sealing ring 5 is provided between the outer rocker arm 3 and the skeleton 1, which seals the rotationally connected outer rocker arm 3 and the skeleton 1 well, and effectively prevents fuel from entering the inside of the skeleton 1 and damaging the reed assembly 7, the resistance sheet 8, the terminal wire harness assembly 9, etc. inside the skeleton 1. Among them, when injection molding, the terminal wire harness assembly 9 inside the skeleton 1 is directly injection molded with the skeleton 1. This setting further improves the sealing performance inside the skeleton 1. If the terminal wire harness assembly 9 and the skeleton 1 are not injection molded together, through holes for the terminal wire harness assembly 9 to pass through will inevitably be opened on the skeleton 1, which will result in the situation that external fuel seeps into the inside of the skeleton 1, and the sealing performance is poor. However, this problem is well solved by the method of injection molding the skeleton 1 and the terminal wire harness assembly 9 in advance, greatly improving the sealing performance inside the skeleton 1. The fuel level sensor in the present utility model can be applied to ethanol fuels above E85, with a long service life and high safety performance.

[0050] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An oil level sensor with good sealing performance, characterized in that, It includes a framework (1) with a plug (2) sealed thereon, and an outer rocker arm (3) is rotatably connected to the framework (1). A float assembly (4) is fixed on the outer rocker arm (3). A first sealing ring (5) is provided between the outer rocker arm (3) and the framework (1). The outer rocker arm (3) is connected to an inner rocker arm (6). A reed assembly (7) is fixed on the inner rocker arm (6). The reed assembly (7) is connected to a resistance sheet (8). The resistance sheet (8) is connected to a terminal wire harness assembly (9). The part of the terminal wire harness assembly (9) inside the framework (1) is injection-molded and connected to the framework (1). A cover plate (10) is connected to the framework (1).

2. The oil level sensor with good sealing performance according to claim 1, characterized in that, The terminal wire harness assembly (9) includes terminals (11) connected to the resistance sheet (8). There are three terminals (11), and the lower ends of the terminals (11) are connected to wire harnesses (12).

3. The oil level sensor with good sealing performance according to claim 2, wherein, The terminal (11) includes a wire harness connection part (13) connected to the wire harness (12). The upper end of the wire harness connection part (13) is fixed to the lower end of a chain belt connection part (14). The upper end of the chain belt connection part (14) is fixed to the lower end of a bending part (15). The upper end of the bending part (15) is fixed to a support part (16). A limiting part (17) extending towards the resistance sheet (8) is fixed to the end of the support part (16). A ceramic plate (18) is provided between the support part (16) and the limiting part (17).

4. The oil level sensor with good sealing performance according to claim 3, characterized in that, The wire harness connection part (13) includes an annular wrapping part (19) fixedly connected to the chain belt connection part (14). The lower end of the annular wrapping part (19) is fixed to a semi-annular support part (20). Two mutually staggered arc-shaped clamping parts (21) are fixed on the bottom surface of the semi-annular support part (20).

5. A fuel level sensor with good sealing performance according to claim 1, characterized in that, The outer rocker arm (3) includes an outer rocker arm body (22) and a rotating shaft (23) fixedly connected to the outer rocker arm body (22). The rotating shaft (23) includes a first rotating shaft (24). A second rotating shaft (25) is fixedly connected to the first rotating shaft (24). A connection part (26) connected to the inner rocker arm (6) is fixed on the second rotating shaft (25). A first through hole (27) matching the first rotating shaft (24) is provided on the framework (1). The diameter of the first rotating shaft (24) is larger than the diameter of the second rotating shaft (25). The first sealing ring (5) is sleeved on the second rotating shaft (25).

6. The oil level sensor with good sealing performance according to claim 5, characterized in that, The first sealing ring (5) includes a dynamic sealing part (28) sleeved on the second rotating shaft (25), and a static sealing part (29) is fixed on the dynamic sealing part (28).

7. The oil level sensor with good sealing performance according to claim 5, characterized in that, The float assembly (4) includes a float (30). One end of a float connecting rod (31) is fixed to the float (30), and the other end of the float connecting rod (31) is fixed on the outer rocker arm (3).

8. The oil level sensor with good sealing performance according to claim 1, characterized in that, The reed assembly (7) is riveted on the inner rocker arm (6) by a rivet (32).

9. The oil level sensor with good sealing performance according to claim 1, wherein, Lubricating oil is injected into the framework (1).

10. A fuel level sensor with good sealing performance according to claim 7, characterized in that, The part of the float link (31) fixed to the framework (1) is arranged as an L-shaped link (33). A blind hole (34) is formed inwards in the rotating shaft (23), and a cross bar (35) of the L-shaped link (33) is fixed in the blind hole (34). A vertical bar (36) of the L-shaped link (33) is clamped in a plurality of arc-shaped limit blocks (37) which are arranged in a staggered manner on the outer rocker arm body (22).

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