A swing-rod type Hall oil level sensor

Abstract

The present invention discloses a swing-rod type Hall oil level sensor, comprising a rotating shaft assembly, a steel wire swing rod, a floating ball assembly, a magnetic steel assembly, a sensing module, a circuit board housing, a flange base, a flange gasket, and an end cover. The present invention adopts an integrally formed embedded cavity to embed the sensing module into the oil tank. The sensing module is connected to the atmosphere outside the oil tank, but not to the inside of the oil tank, so as to realize a non-contact structure; the sensor module has high scalability, and the output form can be changed by replacing other ICs of the same series with different specifications, and the post-programming can be realized by adding a single-chip microcomputer programming intelligent type.

Description

Technical Field

[0001] The invention relates to a swing-rod type Hall oil level sensor, belonging to the technical field of oil level sensors. Background Art

[0002] Fuel level sensors are installed on construction machinery with high working intensity and harsh working conditions (excavators, loaders, bulldozers, forklifts, cranes, road machinery, agricultural machinery, etc.). The vibration intensity is very high, the working environment temperature changes drastically, and the manufacturer requires a long warranty period.

[0003] Currently, most of the widely used fuel level sensors are contact type fuel level sensors. Electronic components such as circuit boards and sensors are in contact with fuel for a long time, which is very easy to corrode, affecting the service life of the sensor, and also has higher requirements for the application environment of the sensor.

[0004] Some existing so-called non-contact oil level sensors use a shell to encapsulate electronic components, but the shell still has a connection gap, which is also immersed in fuel for a long time, and there is still the possibility of oil leakage. In addition, the output wires of the electronic components still need to pass through the "information module" immersed in oil, and then pass through the sensor installation surface and lead to the outside, which may leak oil. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a rocker-type Hall oil level sensor, which completely encapsulates electronic components in an integrally formed shell, thereby realizing a truly non-contact structure. At the same time, it simplifies the product structure, facilitates modular production, and improves production efficiency.

[0006] The main technical solutions adopted in the present invention are:

[0007] A swing-rod type Hall oil level sensor, comprising a shaft assembly, a steel wire swing rod 13, a floating ball assembly, a magnetic steel 9, a sensing module 2, a circuit board housing 19, a flange base 16, a flange gasket 1, and an end cover 3, wherein the circuit board housing 19 and the flange base 16 are integrally formed, a cavity is provided in the circuit board housing 19, and the sensing module 2 is installed in the cavity;

[0008] The shaft assembly includes a shaft seat 4, a steel wire shaft 5, a copper alloy sleeve, a first friction-reducing washer 7 and a second friction-reducing washer 8. The shaft seat 4 is fixedly connected to the circuit board housing 19. The copper alloy sleeve is embedded in the shaft hole of the shaft seat 4. The first friction-reducing washer 7 and the second friction-reducing washer 8 are installed on the outer ring of the steel wire shaft 5. The steel wire shaft 5 is installed with the copper alloy sleeve in the shaft seat 4. The outer end face of the shaft seat 4 is provided with an arc-shaped protrusion 4-1 along the axial direction. A fan-shaped groove 4-2 is provided above the convex block 4-1 for limiting the wire swing rod 13. A central shaft hole 5-1 is provided at the center of the wire shaft 5. An open U-shaped groove 5-2 is provided at the front end of the wire shaft and is connected to the central shaft hole 5-1. The end of the wire swing rod 13 is inserted into the central shaft hole 5-1 of the wire shaft 5 and is bent and embedded in the U-shaped groove 5-2. The front end of the wire shaft 5 is located in the arc-shaped convex block 4-1. The wire swing rod 13 cooperates with the fan-shaped groove 4-2 to limit the position.

[0009] The end of the steel wire shaft 5 passes through the shaft hole of the shaft seat 4, and the magnetic steel 9 is press-fitted and installed at the end of the steel wire shaft 5. The magnetic steel 9 cooperates with the induction module 2 located in the cavity of the circuit board housing 19;

[0010] The flange gasket 1 and the flange base 16 are provided with a plurality of fastening holes 16-1, and are fastened to the side wall of the oil tank by screws. The mounting end face of the flange base 16 is tightly fitted to the side wall of the oil tank. The flange gasket 1 is located at the other end face of the flange base 16. The end cover 3 is bonded to the flange gasket 1 by epoxy glue. An opening is provided on the side wall of the end cover 3 for passing the output wire 17 of the sensing module 2.

[0011] Preferably, an annular retaining ring groove 5 - 4 is formed on the steel wire rotating shaft 5 for clamping the shaft retaining ring 11 , and a copper gasket 20 is provided between the shaft retaining ring 11 and the inner end surface of the rotating shaft seat 4 .

[0012] Preferably, the angle of the fan-shaped groove 4-2 is 108°.

[0013] Preferably, the float assembly includes a float body 6, an O-ring 12 and a plum blossom retaining ring 14. An axial hole is provided in the center of the float body 6. The top end of the wire rocker 13 passes through the axial hole in the center of the float body 6, the O-ring 12 and the plum blossom retaining ring 14 in sequence. The plum blossom retaining ring 14 is provided with a reverse tooth structure, which is fastened with the top end of the wire rocker 13.

[0014] Preferably, two first threaded holes 5-3 are provided on the front end side of the wire shaft 5, and the two first threaded holes 5-3 are symmetrically arranged at both ends of the opening of the U-shaped groove 5-2, the two first threaded holes 5-3 are connected to the axial hole of the wire shaft 5, and two fastening screws 10 are respectively installed in cooperation with the two first threaded holes 5-3 for fixing the wire swing rod 13.

[0015] Preferably, the sensing module 2 includes a uniaxial magnetoresistive angle sensor 2-1 and a circuit board 2-2. The uniaxial magnetoresistive angle sensor 2-1 is connected to the circuit board 2-2 and cooperates with the magnetic steel 9 for sensing. The output end of the circuit board 2-2 is connected to the output wire 17, and the output wire 17 passes through the opening on the side wall of the end cover 3 and is connected to the connector 18.

[0016] Preferably, a harness protective shell is provided on the output wire 17 passing through the opening.

[0017] Preferably, the circuit board shell 19 includes a first shell 19-1 and a second shell 19-2, which are integrally formed; the length of the first shell 19-1 is longer than that of the second shell 19-2, the second shell 19-2 is arranged on the front end surface of the first shell 19-1, and a shaft seat mounting position 19-3 is formed at the top of the first shell; the second shell 19-2 has second threaded holes 19-4 on the upper and lower sides respectively, the shaft seat 4 has fixing holes 4-3 on the upper and lower sides, and is fixedly connected to the second threaded holes 19-4 on the upper and lower sides of the second shell by self-tapping screws 15 respectively, the shaft seat 4 is located at the shaft seat mounting position 19-3, the first shell 19-1 and the second shell 19-2 have cavities, and the circuit board 2-2 is installed in the cavity of the first shell 19-1.

[0018] Preferably, the first shell 19 - 1 is a U-shaped structure.

[0019] Preferably, the first friction-reducing washer 7 and the second friction-reducing washer 8 are both polytetrafluoroethylene friction-reducing washers.

[0020] Beneficial effects: The present invention provides a swing-rod type Hall oil level sensor, which has the following advantages compared with the prior art:

[0021] (1) The present invention designs an integrally formed embedded cavity to embed the sensing module into the fuel tank. The sensing module is connected to the atmosphere outside the fuel tank but not to the inside of the fuel tank, thereby realizing a non-contact structure.

[0022] (2) The output wire in the present invention can be directly led out from the end cap without the need to "pass through the wall", that is, there is no risk of oil leakage;

[0023] (3) The induction module of the present invention adopts a magnetoresistive induction chip, which is an integrated circuit with strong impact and vibration resistance, and is easy to integrate and modularize production, thereby improving production efficiency;

[0024] (4) The single-axis magnetoresistive angle sensor in the present invention is an active sensor, usually with three wires, requiring a power supply, and outputting a voltage analog output. It can also be converted into a current output, a digital output, or a communication port output through a simple conversion;

[0025] (5) The single-axis magnetoresistive angle sensor of the present invention has a continuous analog output and high magnetic induction accuracy;

[0026] (6) The present invention has a wide range of applications and strong environmental applicability. It can be used in conventional gasoline environments (gasoline medium, oil detection stroke is small), and can also be used in harsh working conditions (such as diesel medium, oil detection stroke is large);

[0027] (7) Most of the parts in the present invention are modularly designed, which reduces the number of parts, facilitates production and installation, and improves work efficiency;

[0028] (8) The circuit accommodating cavity of the present invention is redundant, which is convenient for later modification of other electrical components such as single chip microcomputers;

[0029] (9) The present invention has high scalability. The induction module can change the output form by replacing other ICs of the same series with different specifications, and can realize later programming by adding a single-chip microcomputer programming intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the explosion of the overall device of the present invention Figure 1 ;

[0031] Figure 2 Schematic diagram of the explosion of the overall device of the present invention Figure 2 ;

[0032] Figure 3 for Figure 2 A partial schematic diagram of the middle part;

[0033] Figure 4 It is a schematic diagram of the overall structure of the present invention.

[0034] In the figure: flange gasket 1, sensing module 2, single-axis magnetic resistance angle sensor 2-1, circuit board 2-2, end cover 3, shaft seat 4, arc-shaped protrusion 4-1, fan-shaped groove 4-2, fixing hole 4-3, wire shaft 5, central shaft hole 5-1, U-shaped groove 5-2, first threaded hole 5-3, retaining ring groove 5-4, floating ball body 6, first friction-reducing washer 7, second friction-reducing washer 8, magnetic steel 9, fastening screw 10, shaft retaining ring 11, O-ring 12, wire swing rod 13, plum blossom retaining ring 14, self-tapping screw 15, flange base 16, fastening hole 16-1, output wire 17, connector 18, circuit board housing 19, first housing 19-1, second housing 19-2, shaft seat mounting position 19-3, second threaded hole 19-4, copper gasket 20. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0036] A swing-rod type Hall oil level sensor, comprising a shaft assembly, a steel wire swing rod 13, a floating ball assembly, a magnetic steel 9, a sensing module 2, a circuit board housing 19, a flange base 16, a flange gasket 1, and an end cover 3, wherein the circuit board housing 19 and the flange base 16 are integrally formed, a cavity is provided in the circuit board housing 19, and the sensing module 2 is installed in the cavity;

[0037] The shaft assembly includes a shaft seat 4, a steel wire shaft 5, a copper alloy sleeve, a first friction-reducing washer 7 and a second friction-reducing washer 8. The shaft seat 4 is fixedly connected to the circuit board housing 19. The copper alloy sleeve is embedded in the shaft hole of the shaft seat 4. The first friction-reducing washer 7 and the second friction-reducing washer 8 are installed on the outer ring of the steel wire shaft 5. The steel wire shaft 5 is installed with the copper alloy sleeve in the shaft seat 4. The outer end face of the shaft seat 4 is provided with an arc-shaped protrusion 4-1 along the axial direction. A fan-shaped groove 4-2 is provided above the convex block 4-1 for limiting the wire swing rod 13. A central shaft hole 5-1 is provided at the center of the wire shaft 5. An open U-shaped groove 5-2 is provided at the front end of the wire shaft and is connected to the central shaft hole 5-1. The end of the wire swing rod 13 is inserted into the central shaft hole 5-1 of the wire shaft 5 and is bent and embedded in the U-shaped groove 5-2. The front end of the wire shaft 5 is located in the arc-shaped convex block 4-1. The wire swing rod 13 cooperates with the fan-shaped groove 4-2 to limit the position.

[0038] The end of the steel wire shaft 5 passes through the shaft hole of the shaft seat 4, and the magnetic steel 9 is press-fitted and installed at the end of the steel wire shaft 5. The magnetic steel 9 cooperates with the induction module 2 located in the cavity of the circuit board housing 19;

[0039] The flange gasket 1 and the flange base 16 are provided with a plurality of fastening holes 16-1, and are fastened to the side wall of the oil tank by screws. The mounting end face of the flange base 16 is tightly fitted to the side wall of the oil tank. The flange gasket 1 is located at the other end face of the flange base 16. The end cover 3 is bonded to the flange gasket 1 by epoxy glue. The side wall of the end cover 3 is provided with an opening for passing the output wire 17 of the sensing module 2. The number of fastening holes in the present invention can be set according to actual conditions, for example, 4 holes can be evenly opened.

[0040] Preferably, an annular retaining ring groove 5 - 4 is formed on the steel wire rotating shaft 5 for clamping the shaft retaining ring 11 , and a copper gasket 20 is provided between the shaft retaining ring 11 and the inner end surface of the rotating shaft seat 4 .

[0041] Preferably, the angle of the fan-shaped groove 4-2 is 108°.

[0042] Preferably, the float assembly includes a float body 6, an O-ring 12 and a plum blossom retaining ring 14. An axial hole is provided in the center of the float body 6. The top end of the wire rocker 13 passes through the axial hole in the center of the float body 6, the O-ring 12 and the plum blossom retaining ring 14 in sequence. The plum blossom retaining ring 14 is provided with a reverse tooth structure, which is fastened with the top end of the wire rocker 13.

[0043] Preferably, two first threaded holes 5-3 are provided on the front end side of the wire shaft 5, and the two first threaded holes 5-3 are symmetrically arranged at both ends of the opening of the U-shaped groove 5-2, the two first threaded holes 5-3 are connected to the axial hole of the wire shaft 5, and two fastening screws 10 are respectively installed in cooperation with the two first threaded holes 5-3 for fixing the wire swing rod 13.

[0044] Preferably, the sensing module 2 includes a uniaxial magnetoresistive angle sensor 2-1 and a circuit board 2-2. The uniaxial magnetoresistive angle sensor 2-1 is connected to the circuit board 2-2 and cooperates with the magnetic steel 9 for sensing. The output end of the circuit board 2-2 is connected to the output wire 17, and the output wire 17 passes through the opening on the side wall of the end cover 3 and is connected to the connector 18.

[0045] Preferably, a harness protective shell is provided on the output wire 17 passing through the opening.

[0046] Preferably, the circuit board shell 19 includes a first shell 19-1 and a second shell 19-2, which are integrally formed; the length of the first shell 19-1 is longer than that of the second shell 19-2, the second shell 19-2 is arranged on the front end surface of the first shell 19-1, and a shaft seat mounting position 19-3 is formed at the top of the first shell; the second shell 19-2 has second threaded holes 19-4 on the upper and lower sides respectively, the shaft seat 4 has fixing holes 4-3 on the upper and lower sides, and is fixedly connected to the second threaded holes 19-4 on the upper and lower sides of the second shell by self-tapping screws 15 respectively, the shaft seat 4 is located at the shaft seat mounting position 19-3, the first shell 19-1 and the second shell 19-2 have cavities, and the circuit board 2-2 is installed in the cavity of the first shell 19-1.

[0047] Preferably, the first shell 19 - 1 is a U-shaped structure.

[0048] Preferably, the first friction-reducing washer 7 and the second friction-reducing washer 8 are both polytetrafluoroethylene friction-reducing washers.

[0049] In the present invention, the copper alloy shaft sleeve is embedded in the shaft hole in the shaft seat 4 by injection molding, and is used for matching installation with the steel wire shaft 5.

[0050] In the present invention, the shaft retaining ring 11 is radially clamped in the retaining ring groove 5-4 to prevent the steel wire rotating shaft 5 from sliding out of the copper alloy sleeve in the axial direction.

[0051] In the present invention, the magnetic steel 9 and the steel wire rotating shaft 5 are press-fitted and installed, and are bonded with glue.

[0052] The installation method of the present invention:

[0053] Insert the circuit board housing 19 from the outside to the inside through the opening of the side wall of the oil tank, and the mounting end face of the flange base 16 is in close contact with the outer wall of the oil tank. Then, screws are used to pass through the fastening holes 16-1 opened on the flange gasket 1 and the flange base 16 in sequence to fasten the connection with the side wall of the oil tank. Finally, the self-tapping screws 15 are used to fix the shaft seat 4 on the shaft seat mounting position 19-3 on the circuit board housing 19, and the installation is completed. Among them, the shaft assembly, the wire swing rod 13 and the floating ball assembly have been installed on the shaft seat 4.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A rocker-type Hall oil level sensor, characterized in that: It comprises a rotating shaft assembly, a steel wire swing rod (13), a floating ball assembly, a magnetic steel (9), a sensing module (2), a circuit board housing (19), a flange base (16), a flange gasket (1), and an end cover (3), wherein the circuit board housing (19) and the flange base (16) are integrally formed, a cavity is defined in the circuit board housing (19), and the sensing module (2) is mounted in the cavity; The shaft assembly comprises a shaft seat (4), a steel shaft (5), a copper alloy sleeve, a first friction-reducing washer (7) and a second friction-reducing washer (8); the shaft seat (4) is fixedly connected to the circuit board housing (19); the copper alloy sleeve is embedded in the shaft hole of the shaft seat (4); the first friction-reducing washer (7) and the second friction-reducing washer (8) are mounted on the outer ring of the steel shaft (5); the steel shaft (5) is mounted on the copper alloy sleeve in the shaft seat (4); an arc-shaped protrusion (4-1) is provided on the outer end surface of the shaft seat (4) along the axial direction; the arc-shaped protrusion (4-1) is disposed ... A fan-shaped groove (4-2) is provided above the block (4-1) for limiting the position of the steel wire swing rod (13); a central shaft hole (5-1) is provided at the center of the steel wire rotating shaft (5); an open U-shaped groove (5-2) is provided at the front end of the steel wire rotating shaft and is communicated with the central shaft hole (5-1); the end of the steel wire swing rod (13) is inserted into the central shaft hole (5-1) of the steel wire rotating shaft (5) and is bent and embedded in the U-shaped groove (5-2); the front end of the steel wire rotating shaft (5) is located in the arc-shaped protrusion (4-1); the steel wire swing rod (13) 1 cooperates with the fan-shaped groove (4-2) to limit the position; The end of the steel wire shaft (5) passes through the shaft hole of the shaft seat (4), the magnetic steel (9) is press-fitted and installed on the end of the steel wire shaft (5), and the magnetic steel (9) cooperates with the induction module (2) located in the cavity of the circuit board housing (19); The flange gasket (1) and the flange base (16) are both provided with a plurality of fastening holes (16-1) and are fastened to the side wall of the oil tank by means of screws. The mounting end surface of the flange base (16) is tightly fitted to the side wall of the oil tank. The flange gasket (1) is located on the other end surface of the flange base (16). The end cover (3) is bonded to the flange gasket (1) by means of epoxy glue. The side wall of the end cover (3) is provided with an opening for passing an output wire (17) of the sensing module (2). The float assembly comprises a float (6), an O-ring (12) and a plum blossom retaining ring (14); an axial hole is provided at the center of the float (6); the top end of the steel wire swing rod (13) passes through the axial hole at the center of the float (6), the O-ring (12) and the plum blossom retaining ring (14) in sequence; the plum blossom retaining ring (14) is provided with an inverted tooth structure, which is fastened to the top end of the steel wire swing rod (13).

2. A rocker-type Hall oil level sensor according to claim 1, characterized in that: The steel wire rotating shaft (5) is provided with an annular retaining ring groove (5-4) for clamping the shaft retaining ring (11). A copper gasket (20) is provided between the shaft retaining ring (11) and the inner end surface of the rotating shaft seat (4).

3. A rocker-type Hall oil level sensor according to claim 2, characterized in that: The angle of the fan-shaped groove (4-2) is 108°.

4. The rocker-type Hall oil level sensor according to claim 3, characterized in that: Two first threaded holes (5-3) are provided on the front end side surface of the steel wire rotating shaft (5), and the two first threaded holes (5-3) are symmetrically arranged at the two ends of the opening of the U-shaped groove (5-2), the two first threaded holes (5-3) are connected to the shaft hole of the steel wire rotating shaft (5), and two fastening screws (10) are respectively installed in cooperation with the two first threaded holes (5-3) for fixing the steel wire swing rod (13).

5. The rocker-type Hall oil level sensor according to claim 4, characterized in that: The sensing module (2) comprises a single-axis magnetoresistive angle sensor (2-1) and a circuit board (2-2); the single-axis magnetoresistive angle sensor (2-1) is connected to the circuit board (2-2) and cooperates with the magnetic steel (9) for sensing work; the output end of the circuit board (2-2) is connected to an output wire (17); the output wire (17) passes through an opening on a side wall of the end cover (3) and is connected to a connector (18).

6. The rocker-type Hall oil level sensor according to claim 5, characterized in that: A wiring harness protective shell is provided on the output wire (17) passing through the opening.

7. The rocker-type Hall oil level sensor according to claim 6, characterized in that: The circuit board housing (19) comprises a first housing (19-1) and a second housing (19-2), which are integrally formed. The first housing (19-1) is longer than the second housing (19-2), the second housing (19-2) is arranged on the front end surface of the first housing (19-1), and a shaft seat installation position (19-3) is formed at the top end of the first housing (19-1). The second housing (19-2) is provided with second threaded holes (19-4) on the upper and lower sides, respectively. The shaft seat (4) is provided with fixing holes (4-3) on the upper and lower sides, and is fixedly connected to the second threaded holes (19-4) on the upper and lower sides of the second housing by self-tapping screws (15), respectively. The shaft seat (4) is located at the shaft seat installation position (19-3). Both the first housing (19-1) and the second housing (19-2) are provided with cavities, and the circuit board (2-2) is installed in the cavity of the first housing (19-1).

8. The rocker-type Hall oil level sensor according to claim 7, characterized in that: The first shell (19-1) is a U-shaped structure.

9. The rocker-type Hall oil level sensor according to claim 8, characterized in that: The first anti-friction washer (7) and the second anti-friction washer (8) are both polytetrafluoroethylene anti-friction washers.

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