CN212845451U

CN212845451U - Rotating speed sensor

Info

Publication number: CN212845451U
Application number: CN202021423865.6U
Authority: CN
Inventors: 王平
Original assignee: Wuhan Hansheng Automobile Sensor Co ltd
Current assignee: Wuhan Hansheng Automobile Sensor Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2021-03-30
Anticipated expiration: 2030-07-20

Abstract

The application relates to a rotating speed sensor, which relates to the technical field of sensors and comprises a speed measuring mechanism, a speed measuring component and an end cover, wherein the speed measuring mechanism comprises the speed measuring component and the end cover; one end of the connector assembly is connected to the top end of the end cover, and the other end of the connector assembly is used for connecting a power supply; the protective shell is sleeved outside the speed measuring mechanism, a first filling space is formed between the protective shell and the speed measuring assembly, and a second filling space is formed between the protective shell and the end cover; the first sealant is filled in the first filling space so as to seal the protective shell and the speed measuring assembly; and the second sealant is filled in the second filling space so as to seal the protective shell and the end cover. Fill in first filling space through first sealed glue to sealed protective housing and the subassembly that tests the speed, and fill in second filling space through sealed glue of second, with sealed protective housing and end cover, form double seal, dust, oil, water etc. can't get into between protective housing and the speed measuring mechanism, cause the harm to the subassembly that tests the speed.

Description

Rotating speed sensor

Technical Field

The application relates to the technical field of sensors, in particular to a rotating speed sensor.

Background

The rotation speed sensor is a sensor that converts the rotation speed of a rotating object into an electric quantity to be output. The rotation speed sensor belongs to an indirect measuring device, when a measured object is provided with a convex (or concave) magnetic or magnetic conductive material, the sensor outputs a pulse signal related to the rotation frequency along with the rotation of the measured object, thereby achieving the purpose of speed measurement or displacement detection.

Based on the speed measurement principle of the revolution speed sensor, the interior of the revolution speed sensor must be in a dust-free state, but the existing revolution speed sensor generally adopts the assembly process of a shell and a joint, and an assembly gap exists between the joint and the shell; and the service environment of the revolution speed transducer is generally exposed outdoors, which causes dust, oil, water and the like to easily enter the transducer to cause failure, and frequent impact, vibration, overload, dirt entering and the like frequently occur in the running process of the vehicle, so that the signal receiving of the transducer is seriously influenced, and the reliability of the measuring result is greatly reduced.

Disclosure of Invention

The embodiment of the application provides a revolution speed sensor to solve among the correlation technique revolution speed sensor's leakproofness poor, lead to inside the problem that leads to losing efficacy of easy access sensor such as dust, oil, water.

In a first aspect, a rotational speed sensor is provided, which includes:

the speed measuring mechanism comprises a speed measuring component and an end cover;

one end of the connector assembly is connected to the top end of the end cover, and the other end of the connector assembly is used for connecting a power supply;

the protective shell is sleeved outside the speed measuring mechanism, a first filling space is formed between the protective shell and the speed measuring assembly, and a second filling space is formed between the protective shell and the end cover;

the first sealant is filled in the first filling space so as to seal the protective shell and the speed measuring component;

and the second sealant is filled in the second filling space so as to seal the protective shell and the end cover.

In some embodiments, the end cap is provided with a glue filling hole communicated with the first filling space, and the rotation speed sensor further includes a plugging mechanism, and the plugging mechanism is disposed in the glue filling hole to plug the glue filling hole.

In some embodiments, the blocking mechanism is a steel ball having a diameter equal to a diameter of the glue pouring hole.

In some embodiments, the speed measuring component comprises a PCB circuit board, magnetic steel and a hall chip which are connected in sequence, the PCB circuit board is connected with the end cover, and the hall chip is connected with the bottom end of the protective shell.

In some embodiments, the first sealant is an epoxy glue.

In some embodiments, the second sealant is silicone.

In some embodiments, the protective housing includes a first housing and a second housing connected to each other, and the first housing and the second housing are respectively sleeved outside the speed measuring component and the end cap, and form the first filling space and the second filling space with the speed measuring component and the end cap, respectively.

In some embodiments, the inner diameter of the first housing gradually increases from the end of the first housing far away from the second housing to the end of the first housing close to the second housing.

In some embodiments, the protective shell is provided with a groove, and the joint assembly is obliquely embedded in the groove so that an obtuse angle is formed between the axis of the joint assembly and the horizontal plane of the end cover.

In some embodiments, the rotational speed sensor further comprises a mounting mechanism, the mounting mechanism comprising:

the lantern ring is sleeved on the protective shell;

and the mounting seat is connected with the lantern ring, and a mounting hole for mounting the rotating speed sensor is formed in the mounting seat.

The beneficial effect that technical scheme that this application provided brought includes: adopt first sealant and sealed gluey dual seal to realize speed sensor of second, prevent that dust, oil, water etc. from getting into between protective housing and the speed measuring mechanism, cause the harm to the speed measuring subassembly, cause the problem of sensor inefficacy, speed sensor's sealed effectual, the durability is strong.

The embodiment of the application provides a revolution speed sensor, because the revolution speed sensor of this application fills in the first packing space that forms between protective housing and speed measuring subassembly through first sealed glue, with sealed protective housing and speed measuring subassembly, and fill in the second packing space that forms between protective housing and end cover through sealed glue of second, with sealed protective housing and end cover, form double seal, dust, oil, water etc. can't get into between protective housing and the speed measuring mechanism, cause the harm to the speed measuring subassembly. Therefore, the rotating speed sensor is good in sealing effect and strong in durability.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a horizontal state of a rotation speed sensor according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a vertical state of a rotation speed sensor provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of the interior of a rotation speed sensor provided in an embodiment of the present application;

fig. 4 is a full sectional view of fig. 2.

In the figure: 1. a speed measuring mechanism; 10. a speed measuring component; 100. a PCB circuit board; 101. magnetic steel; 102. a Hall chip; 11. an end cap; 12. filling glue holes; 2. a joint assembly; 3. a protective housing; 30. a first filling space; 31. a second fill space; 32. a first housing; 33. a second housing; 34. a groove; 4. a first sealant; 5. a second sealant; 6. a plugging mechanism; 7. an installation mechanism; 70. a collar; 71. a mounting seat; 72. and (7) installing holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 to 4, an embodiment of the present application provides a tachometer sensor, which includes a tachometer mechanism 1, a connector assembly 2, a protective shell 3, a first sealant 4, and a second sealant 5, where the tachometer mechanism 1 includes a tachometer assembly 10 and an end cover 11; one end of the connector component 2 is connected to the top end of the end cover 11, and the other end of the connector component is used for connecting a power supply so as to supply power to the rotation speed sensor; the protective shell 3 is sleeved outside the speed measuring mechanism 1, the speed measuring component 10 is contacted with the bottom end of the protective shell 3, used for detecting the rotating speed of a product to be detected, the end cover 11 is positioned at the top end of the protective shell 3, the joint component 2 is positioned outside the protective shell 3, because the inner diameter of the protective shell 3 needs to be larger than the inner diameter of the speed measuring mechanism 1, an assembly gap exists between the protective shell 3 and the speed measuring mechanism 1, a first filling space 30 is formed between the protective shell 3 and the speed measuring component 10, and a second filling space 31 is formed between the protective shell and the end cover 11, therefore, the gap between the protective shell 3 and the speed measuring mechanism 1 needs to be sealed by the sealant, in the present application, the first sealant 4 is filled in the first filling space 30 to seal the protective shell 3 and the speed measuring component 10, and the second sealant 5 is filled in the second filling space 31 to seal the protective casing 3 and the end cap 11. Therefore, the full sealing between the protective shell 3 and the speed measuring mechanism 1 is realized, and the damage of failure caused by the fact that dust, oil, water and the like easily enter the sensor is prevented.

The rotational speed sensor of this application embodiment fills in the first packing space 30 that forms between protective housing 3 and the subassembly 10 that tests the speed through first sealed glue 4, in order to seal protective housing 3 and the subassembly 10 that tests the speed, and fill in the second packing space 31 that forms between protective housing 3 and end cover 11 through sealed glue 5 of second, in order to seal protective housing 3 and end cover 11, form double seal, the dust, oil, water etc. can't get into between protective housing 3 and the speed measuring mechanism 1, cause the harm to the subassembly 10 that tests the speed. Therefore, the rotating speed sensor is good in sealing effect and strong in durability.

Referring to fig. 3 and 4, the end cover 11 is provided with a glue filling hole 12 communicated with the first filling space 30, and the rotational speed sensor further includes a plugging mechanism 6, wherein the plugging mechanism 6 is disposed in the glue filling hole 12 to plug the glue filling hole 12. Glue enters the first filling space 30 from the glue filling hole 12 to seal the protective shell 3 and the end cover 11, and after filling and sealing are finished, the glue filling hole 12 is blocked by the blocking mechanism 6 to prevent the first sealant 4 from overflowing.

Preferably, the blocking mechanism 6 is a steel ball, and the diameter of the steel ball is equal to that of the glue pouring hole 12. The steel ball just blocks up in encapsulating hole 12, and the steel ball corrosion resistance, wearability are strong, can play good shutoff effect.

Further, the speed measuring component 10 comprises a PCB circuit board 100, magnetic steel 101 and a hall chip 102 which are connected in sequence, the PCB circuit board 100 is connected with the end cover 11, and the hall chip 102 is connected with the bottom end of the protective shell 3. The rotating speed sensor of the embodiment of the application adopts the Hall type rotating speed sensor, when the measured object is provided with the raised (or sunken) magnetic or magnetic conductive material, the sensor outputs the pulse signal related to the rotating frequency when the measured object rotates, and the purpose of speed measurement or displacement detection is achieved.

Further, the first sealant 4 is epoxy glue. The cured epoxy glue has excellent physical and chemical performance, excellent adhesion strength to the surface of metal and non-metal material, good dielectric performance, small set shrinkage and high product size stability. The rotary speed sensor is used in a high-temperature environment for a long time, the shrinkage of the rotary speed sensor in size can occur, the epoxy glue can maintain the size and does not deform greatly, a good shaping effect is achieved on the rotary speed sensor, and a good bonding effect between the protective shell 3 and the speed measuring assembly 10 can be achieved.

Further, the second sealant 5 is silica gel. Silica gel is a high-activity adsorption material, does not react with any substance except strong alkali and hydrofluoric acid, is insoluble in water and any solvent, is nontoxic and odorless, and has stable chemical properties. The second filling space 31 is more likely to fall into pollutants such as dust, and the silica gel can play a more durable and stable sealing effect.

Referring to fig. 3, optionally, the protective casing 3 includes a first casing 32 and a second casing 33 connected to each other, the first casing 32 and the second casing 33 are respectively sleeved outside the velocity measuring assembly 10 and the end cover 11, and form a first filling space 30 and a second filling space 31 with the velocity measuring assembly 10 and the end cover 11, respectively. The speed measuring component 10 is smaller than the end cover 11 in diameter, so the outer diameter of the first shell 32 is also smaller than the outer diameter of the second shell 33, and the speed measuring component 10 and the end cover 11 are respectively matched to reduce the space volume of the first filling space 30 and the second filling space 31 and reduce the usage amount of the first sealant 4 and the second sealant 5.

Referring to fig. 3, the inner diameter of the first housing 32 preferably increases from the end of the first housing 32 away from the second housing 33 to the end of the first housing 32 near the second housing 33. Because the first sealant 4 is encapsulated in the first filling space 30, the volume of the first sealant 4 after curing expands, and the volume of the first sealant 4 after curing and expanding needs to be provided to prevent the first sealant 4 from overflowing.

Referring to fig. 1 and 2, optionally, a groove 34 is formed on the protective shell 3, and the joint component 2 is obliquely embedded in the groove 34, so that an obtuse angle is formed between the axis of the joint component 2 and the horizontal plane where the end cover 11 is located. The connector component 2 is obliquely arranged to reduce the size of the speed measuring space occupied by the speed measuring mechanism 1, so that the measuring process of the speed measuring sensor is prevented from being interfered.

Referring to fig. 1 and fig. 2, optionally, the rotation speed sensor further includes a mounting mechanism 7, the mounting mechanism 7 includes a collar 70 and a mounting seat 71, and the collar 70 is sleeved on the protective housing 3; the mounting base 71 is connected to the collar 70, and a mounting hole 72 for mounting the rotation speed sensor is opened in the mounting base 71. The collar 70 also serves to reinforce the protective housing 3, and the rotational speed sensor is installed through the installation hole 72, thereby saving installation space.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotational speed sensor, characterized in that it comprises:

the speed measuring mechanism (1) comprises a speed measuring component (10) and an end cover (11);

the connector assembly (2) is connected with the top end of the end cover (11) at one end and connected with a power supply at the other end;

the protective shell (3) is sleeved outside the speed measuring mechanism (1), a first filling space (30) is formed between the protective shell (3) and the speed measuring component (10), and a second filling space (31) is formed between the protective shell and the end cover (11);

the first sealing glue (4) is filled in the first filling space (30) so as to seal the protective shell (3) and the speed measuring component (10);

and a second sealant (5) filled in the second filling space (31) to seal the protective shell (3) and the end cover (11).

2. The rotational speed sensor according to claim 1, wherein the end cap (11) is provided with a glue filling hole (12) communicated with the first filling space (30), the rotational speed sensor further comprises a plugging mechanism (6), and the plugging mechanism (6) is arranged in the glue filling hole (12) to plug the glue filling hole (12).

3. A rotation rate sensor according to claim 2, wherein the blocking mechanism (6) is a steel ball having a diameter equal to the diameter of the glue filling hole (12).

4. The revolution speed sensor according to claim 1, wherein the speed measuring component (10) comprises a PCB circuit board (100), a magnetic steel (101) and a hall chip (102) which are connected in sequence, the PCB circuit board (100) is connected with the end cover (11), and the hall chip (102) is connected with the bottom end of the protective shell (3).

5. A tacho sensor according to claim 1, characterized in that the first sealant (4) is an epoxy glue.

6. A rotation rate sensor according to claim 1, wherein the second sealant (5) is silicone.

7. A tachometer sensor according to claim 1, characterized in that the protective housing (3) comprises a first housing (32) and a second housing (33) connected to each other, the first housing (32) and the second housing (33) are respectively sleeved outside the tachometer component (10) and the end cap (11), and form the first filling space (30) and the second filling space (31) with the tachometer component (10) and the end cap (11).

8. A rotation speed sensor according to claim 7, wherein the inner diameter of the first housing (32) is gradually increased from the end of the first housing (32) remote from the second housing (33) to the end of the first housing (32) close to the second housing (33).

9. A tachometer sensor according to claim 1, characterized in that the protective housing (3) is provided with a recess (34), and the joint assembly (2) is obliquely inserted into the recess (34) so that the axis of the joint assembly (2) forms an obtuse angle with the horizontal plane of the end cap (11).

10. A rotation speed sensor according to claim 1, characterized in that it further comprises a mounting mechanism (7), said mounting mechanism (7) comprising:

a lantern ring (70) sleeved on the protective shell (3);

and the mounting seat (71) is connected with the lantern ring (70), and a mounting hole (72) for mounting the rotating speed sensor is formed in the mounting seat (71).