KR20210004653A - non-contact type inhibitor switch - Google Patents

Abstract

According to one embodiment, a non-contact type inhibitor switch comprises: an actuator formed by protrusion of a shaft; a moving block where a permanent magnet is mounted and the shaft penetrates and is coupled to enable the moving block to be rotated while linked with the shaft; a cover having a penetration hole where the shaft penetrates and having a connector insertion unit extended from a side surface thereof, wherein the connector is inserted into the connector insertion unit; a sensor assembly having a magnetic sensor facing the permanent magnet and spaced from the permanent magnet while having an air gap from the permanent magnet; and a base plate fixating an output terminal electrically connected to the sensor assembly and insert injection molded inside the cover.

Description

Non-contact type inhibitor switch {non-contact type inhibitor switch}

The present invention relates to a non-contact type inhibitor switch, and more particularly, to a non-contact type inhibitor switch for detecting a shift stage for an automatic transmission of a vehicle.

The inhibitor switch is a device that detects the corresponding shift stage (P, R, N, D) when the driver operates the shift lever. The shift stage information detected by the inhibitor switch is transmitted to the engine control unit and the transmission control unit, and is used for various driving control of the vehicle. An example of this is that the R stage and D stage are inhibited from starting, and this function is the origin of the name of the inhibitor switch.

Inhibitor switches are divided into contact type and non-contact type. In the contact type, contact failure occurs due to abrasion and penetration of foreign substances, and the shift stage detection performance is degraded. In order to solve the problem of such a contact type inhibitor switch, a non-contact type inhibitor switch has been developed that detects a shift stage using a Hall element. Representatively, Korean Patent No. 10-1901055 may be mentioned.

The non-contact inhibitor switch of Korean Patent No. 10-1901055 detects a change in magnetic flux of the permanent magnet through the Hall element by installing a permanent magnet and a Hall element horizontally apart. However, the non-contact inhibitor switch of Korean Patent No. 10-1901055 has a problem in that the Hall element is damaged by heat as both sides of the bottom surface of the horizontal portion of the Hall element installation portion of the housing are hot caulked. In addition, it takes a considerable amount of time to cure by injecting an epoxy resin into the Hall element installation part of the housing, and bubbles are generated, resulting in poor quality.

The present invention has been proposed to solve the above problems, and prevents circuit damage due to heat and quality defects due to air bubbles, and also reduces product manufacturing time, and prevents contamination by foreign substances. Its purpose is to provide a non-contact inhibitor switch that can prevent assembly.

A non-contact inhibitor switch according to an embodiment includes an actuator formed by protruding a shaft; A moving block to which a permanent magnet is mounted and the shaft is coupled through to rotate in association with the shaft; A cover formed by extending a through hole through which the shaft passes and a connector inserting portion into which a connector is inserted extending to a side thereof; And a sensor assembly including a magnetic sensor that faces the permanent magnet and spaced apart from the air gap, and a base plate that fixes an output terminal electrically connected to the sensor assembly, and is inserted into the cover.

The base plate and the sensor assembly have a planar structure, and the base plate is formed to be spaced apart from one surface of the base plate to guide side insertion of the sensor assembly in the horizontal direction and side insertion to fix the sensor assembly It may include a guide member.

The side insertion guide member may have an inclined protrusion formed on a surface facing one surface of the base plate to guide the insertion of the sensor assembly and then fix the sensor assembly.

The permanent magnet is installed on a protrusion protruding outward from the lower end of the moving block in a radial direction, and the magnetic sensor of the sensor assembly may face the permanent magnet in a vertical direction.

The sensor assembly includes the magnetic sensor, a circuit protection element, a conductive connection part connecting the magnetic sensor and the circuit protection element, and a sensor leg extending from the circuit protection element, and one end of the output terminal Is exposed in the direction of the connector insertion part, the other end is exposed to the center portion of the base plate, and the other end is electrically connected to the sensor leg to be welded.

The non-contact inhibitor switch may further include an oil seal inserted into a groove formed on an outer circumferential surface of the shaft and partially exposed to the outside to contact the cover.

The non-contact inhibitor switch may further include a packing inserted into a circular groove formed on an upper surface of the actuator and partially exposed to the upper surface of the actuator to contact a lower surface of the cover.

The base plate includes at least one caulking rib on a surface on which the output terminal and the sensor assembly are mounted, and the output terminal and the sensor assembly are cold caulked using the at least one caulking rib to the base plate Can be fixed to

The cover may include a seat protruding from the inner circumferential surface in a radial direction; And two cover stoppers protruding from an upper portion of the seating portion at intervals, and the moving block may include a moving stopper protruding from an outer circumferential surface in a radial direction and installed between the two cover stoppers of the seating portion. .

According to an embodiment, by insert-injecting the base plate on which the sensor assembly is installed into the cover, the base plate can be protected from external contaminants without using an epoxy resin or the like. In particular, it is possible to fundamentally block the inflow of external contaminants by maintaining a perfect airtight state by using oil seals and packings.

According to an embodiment, when the sensor assembly is installed on the base plate, cold caulking is performed to fix the sensor assembly to the base plate, thereby preventing component damage due to heat.

According to an embodiment, by placing a moving stopper of a moving block between two cover stoppers in a cover so that the moving block does not rotate beyond a preset operation angle, malfunction and incorrect assembly of the inhibitor switch can be prevented.

According to an embodiment, the sensor assembly may be strongly fixed by side-inserting the sensor assembly to the base plate in the horizontal direction.

1 is an exploded perspective view of a non-contact inhibitor switch according to an embodiment of the present invention.
2 is a side cross-sectional view of the contactless inhibitor switch of FIG. 1.
3 is a top cross-sectional view of the non-contact inhibitor switch of FIG. 1.
4 is a partially exploded perspective view of a base plate according to an embodiment of the present invention.
5 is a plan view of a base plate according to an embodiment of the present invention.
6 is an enlarged view of part A of FIG. 5.
7 is an exploded perspective view of a non-contact inhibitor switch according to another embodiment of the present invention.
8 is a side cross-sectional view of the non-contact inhibitor switch of FIG. 7.
9 is a partially exploded perspective view showing the base plate of FIG. 7.
10 is a partial exploded perspective view showing a base plate according to another embodiment of the present invention.
11 is a plan view of the base plate of FIG. 10.
12 is an enlarged view of a junction of the sensor leg of FIG. 10.

The above-described objects, features, and advantages will become more apparent through the following detailed description in connection with the accompanying drawings, whereby those of ordinary skill in the technical field to which the present invention pertains can easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a non-contact inhibitor switch according to an embodiment of the present invention, FIG. 2 is a side cross-sectional view of the non-contact inhibitor switch of FIG. 1, and FIG. 3 is a plan cross-sectional view of the non-contact inhibitor switch of FIG.

1 to 3, the non-contact inhibitor switch according to this embodiment includes a cover 100, a screw 200, a base plate 300, a moving block 400, an oil seal 500, and a packing 600. ) And an actuator 700.

The cover 100 is a means for covering an upper portion of the actuator 700, and a through hole 110 through which the shaft 710, which is a transmission axis, passes is formed, and the base plate 300 in which the magnetic sensor 321 is installed. ) Is inserted and fixed inside, and a connector insertion portion 130 into which the connector is inserted extends to the side. As shown in FIG. 1, a shift stage indication symbol 120 is formed around the through hole 110 on the upper surface of the cover 100. Accordingly, when the shaft 710, which is the transmission rotation shaft, is coupled to the through hole 110 of the cover 100, the assembly is well performed at the N shift level.

The screw 200 is a means for coupling and fixing the cover 100 and the actuator 700 when the cover 100 is fastened to the upper surface of the actuator 700. Although the screw 200 is exemplified in this embodiment, the means for fixing the cover 100 and the actuator 700 may be implemented in various forms. For example, it can be fixed through a fitting structure or a hooking structure. The screw 200 is inserted into and fixed to the bush 140 formed along the circumference of the cover 100.

The base plate 300 has a shape bent in a'L' shape, and the output terminals 310 are fixed to a part of the upper surface through insert injection, and the sensor assembly is fixed to the other part and the side of the upper surface. do. Preferably, the magnetic sensor 321 of the sensor assembly is vertically inserted and fixed to the side of the base plate 300. The sensor assembly will be described in detail below with reference to FIGS. 4 to 6. Preferably, after the output terminals 310 and the sensor assembly are electrically connected and fixedly installed, the base plate 300 is insert-injected together with the cover 100 to maintain an airtight state within the cover 100. In this way, by insert-injecting the base plate 300 into the cover 100, the base plate 300, particularly the sensor assembly and the output terminals 310, are prevented from being contaminated from external contaminants, that is, moisture or oil. Conventionally, defects such as bubble generation occurred in the process of injection curing of silicone or epoxy, but by insert-injecting the base plate 300 into the cover 100, the airtight state is maintained to prevent such defects. The magnetic sensor 321 inserted perpendicularly to the side surface of the base plate 300 faces the permanent magnet 410 installed on the outer circumferential surface of the moving block 400 with an air gap.

In the moving block 400, the shaft 710 of the actuator 700, which is a transmission rotation shaft, is coupled through and rotates in conjunction with the shaft 710. Preferably, a protrusion is formed on the inner circumferential surface of the moving block 400 and the protrusion is coupled to a groove formed on the outer circumferential surface of the shaft 710 so that the moving block 400 and the shaft 710 rotate in conjunction with each other. As shown in FIG. 2, a permanent magnet 410 is mounted on at least a portion of the outer circumferential surface of the moving block 400, and a magnetic sensor 321 inserted and fixed to the side of the base plate 300 with the air gap And face in the horizontal direction. When the moving block 400 rotates in conjunction with the shaft 710, the magnetic flux of the permanent magnet 410 mounted on the outer circumferential surface of the moving block 400 is changed, and the magnetic flux change accordingly changes to the side of the base plate 300. The magnetic sensor 321 inserted in it is detected.

The oil seal 500 is inserted into a groove formed on the outer circumferential surface of the shaft 710 of the actuator 700 and partially exposed to the outside to contact the cover 100. Therefore, the oil seal 500 supports the moving block 400 to rotate smoothly, prevents the flow of the moving block 400, and maintains airtightness so that foreign contaminants do not flow into the cover 100 from the outside. The packing 600 is inserted into a circular groove formed on the upper surface of the actuator 700 and partially exposed to the lower surface of the cover 100 to support the cover 100 while supporting the cover 100. Airtight is maintained so that no foreign contaminants are introduced from the bottom.

Referring to FIG. 3, a seating portion 150 protruding in a radial direction is provided on an inner peripheral surface of the cover 100. Two cover stoppers 160 and 170 protrude at regular intervals on the upper surface of the seating portion 150. One cover stopper 160 of the two cover stoppers 160 and 170 is a D-stage stopper corresponding to the drive (D) of the shift stage, and the other cover stopper 170 corresponds to the parking (P) of the shift stage. It is a P stage stopper. Further, a moving stopper 420 protruding in the radial direction is formed on a part of the outer peripheral surface of the moving block 400, and the moving stopper 420 is seated on the seating portion 150 of the cover 100. The moving stopper 420 limits the moving block 400 to rotate only between the two cover stoppers 160 and 170. That is, the moving block 400 rotates only between the D and P stages of the shift stage. Since the moving stopper 420 is positioned between the two cover stoppers 160 and 170, it is possible to prevent mis-assembly when the moving block 400 is assembled to the cover 100. Preferably, in the moving block 400, the moving stopper 420 is formed at a position opposite to the installation position of the permanent magnet 410. If the surface where the permanent magnet of the moving block is inserted as in the prior art is used as a moving stopper, the UK magnet may be damaged due to a large external rotational force. However, in the present invention, the moving stopper 420 is set to the installation position of the permanent magnet 410 This problem is solved by installing in the opposite position.

4 is a partially exploded perspective view of a base plate according to an embodiment of the present invention, FIG. 5 is a plan view of the base plate according to an embodiment of the present invention, and FIG. 6 is an enlarged view of portion A of FIG. 5.

Referring to FIG. 4, the base plate 300 has a shape bent in a'L' shape, and output terminals 310 are fixed to a part of the upper surface through insert injection, and other parts of the upper surface and The sensor assembly 320 is fixed to the side. Like the base plate 300, the sensor assembly 320 has a shape bent in a'L' shape. The sensor assembly 320 includes a magnetic sensor 321, a circuit protection element 323, a connection part 322 connecting the magnetic sensor 321 and the circuit protection element 323, and a plurality of sensor legs 324 do. The connection part 322 has an elastic force as a conductive conductor, and thus, the connection part 322 is bent so that the magnetic sensor 321 and the circuit protection element 323 are perpendicular to each other. In addition, the plurality of sensor legs 324 also have elastic force as conductive conductors, and the gaps therebetween are widened to make corresponding contact with the output terminal 310. The magnetic sensor 321 is, for example, a Hall sensor. However, the present invention is not limited thereto, and any sensor capable of detecting a change in magnetic flux of the permanent magnet 410 may be used without limitation.

4, the side of the base plate 300 includes a sensor insertion portion 301 extending downward, and the magnetic sensor 321 of the sensor assembly 320 is inserted into the sensor insertion portion 301 . Accordingly, the magnetic sensor 321 and the permanent magnet 410 of the moving block 400 are spaced apart from each other by an air gap and a partition wall to face in a horizontal direction. As shown in FIG. 5, a plurality of caulking ribs 302 are installed on the base plate 300, and the connection portion 322 of the sensor assembly 320 and the plurality of sensor legs ( The 324 is cold caulked and fixed to the base plate 300. 4 and 5 again, one end of the output terminals 310 is exposed to the outside of the base plate 300, that is, toward the connector insertion part 130, and the other ends are the top surface of the base plate 300. It is exposed at the middle portion of the sensor leg junction 311. As shown in FIG. 6, the other ends of the output terminals 310 are exposed to the sensor leg junction 311 of the base plate 300 as described above, and the sensor assembly 320 is on the other ends. After the plurality of sensor legs 324 are overlapped, they are welded to be electrically connected. As shown in FIG. 6, at least two or more welding points 610 for each output terminal are welded. By applying a plurality of welding points to each output terminal, even if a defect occurs in one welding, the other plurality of welding points of the output terminal are properly in contact, so that stability against contact failure can be obtained. The welding may be laser welding or resistance welding, but is not limited thereto.

In addition, the base plate 300 and the sensor assembly 320 may be fixed to each other by overmolding, that is, insert injection, thereby securing an air gap between the moving block 400 and a predetermined interval.

7 is an exploded perspective view of a non-contact inhibitor switch according to another embodiment of the present invention, and FIG. 8 is a side cross-sectional view of the non-contact inhibitor switch of FIG. 7. In the embodiment with reference to FIGS. 7 and 8, components having the same reference numerals as the embodiment described with reference to FIGS. 1 to 6 have the same structure and function as described with reference to FIGS. 1 to 6.

In the embodiment with reference to FIGS. 1 to 6, the permanent magnet 410 of the moving block 400 and the magnetic sensor 321 inserted into the base plate 300 are implemented to face each other in a horizontal direction with an air gap. On the other hand, in the non-contact inhibitor switch of the embodiment with reference to FIGS. 7 and 8, the permanent magnet 810 of the moving block 800 and the magnetic sensor 321 installed on the base plate 900 are vertically aligned with an air gap. It is implemented to face to face. To this end, the sensor assembly 320 installed on the base plate 900 maintains a linear planar structure without bending the connection part 322 as described below. In addition, the sensor assembly 320 is installed on the lower surface of the base plate 900 instead of the upper surface. In addition, a permanent magnet 810 is installed on a protrusion protruding from the lower end of the moving block 800 to the outside in a radial direction. Accordingly, the permanent magnet 810 and the magnetic sensor 321 of the sensor assembly 320 face each other in a vertical direction.

9 is a partially exploded perspective view showing the base plate of FIG. 7, and the bottom surface of the base plate 900 is shown to be visible above. The base plate 900 shown in FIG. 9 has a straight plane structure unlike the base plate 300 shown in FIG. 4. The output terminals 310, the plurality of caulking ribs 302, and the sensor leg junction 311 of the base plate 900 shown in FIG. 9 are the same as the structure of the base plate 300 described with reference to FIG. Do.

FIG. 10 is a partial exploded perspective view of a base plate according to another embodiment of the present invention, FIG. 11 is a plan view of the base plate of FIG. 10, and FIG. 12 is an enlarged view of the sensor leg junction of FIG. The sensor assembly 320 shown in FIGS. 10 to 12 is the same as the embodiment described with reference to FIG. 9. 10 and 11, the base plate 1000 is. It has a linear planar structure, and further includes at least one side insertion guide member 1003 that guides side insertion of the sensor assembly 320 in the horizontal direction and fixes the sensor assembly 320. The side insertion guide member 1003 is formed to be spaced apart from one surface of the base plate 1000, that is, the upper surface, thereby forming an accommodation space into which the sensor assembly 320 can be inserted. In addition, an inclined protrusion is formed on a lower surface of the side insertion guide member 1003, that is, a surface facing one surface of the base plate 1000 to prevent separation of the sensor assembly 320 after insertion of the sensor assembly 320. The inclined protrusion has a structure in which an interval with one surface of the base plate 1000 becomes narrower toward an inner direction into which the sensor assembly 320 is inserted. 11 and 12, one end of the output terminals 310 inserted and installed in the base plate 1000 are exposed to the outside of the base plate 1000, and the other ends are the sensors of the base plate 1000. The leg joint 311 is exposed, and the other ends exposed to the sensor leg joint 311 are bent at a right angle to be welded to the plurality of sensor legs 324 of the sensor assembly 320.

While this specification includes many features, such features should not be construed as limiting the scope or claims of the invention. In addition, features described in separate embodiments herein may be combined and implemented in a single embodiment. Conversely, various features described in a single embodiment herein may be individually implemented in various embodiments, or may be properly combined and implemented.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those of ordinary skill in the technical field to which the present invention belongs. It is not limited by the drawings.

100: cover
110: through hole
130: connector insert
140: bush
200: screw
300, 900, 1000: base plate
310: output terminal
320: sensor assembly
321: magnetic sensor
322: connection
323: circuit protection element
324: sensor leg
400, 800: moving block
410, 810: permanent magnet
500: oil seal
600: packing
700: actuator
710: shaft

Claims (9)

As a non-contact inhibitor switch,
An actuator formed by protruding a shaft;
A moving block to which a permanent magnet is mounted and the shaft is coupled through to rotate in association with the shaft;
A cover formed by extending a through hole through which the shaft passes and a connector inserting portion into which a connector is inserted extending to a side thereof; And
A non-contact inhibitor comprising a sensor assembly comprising a magnetic sensor facing the permanent magnet and spaced apart from the air gap, an output terminal electrically connected to the sensor assembly, and a base plate insert-injected into the cover switch. The method of claim 1,
Each of the base plate and the sensor assembly has a planar structure,
The base plate,
And a side insertion guide member that is formed to be spaced apart from one surface of the base plate to guide side insertion of the sensor assembly in a horizontal direction and to fix the sensor assembly. The method of claim 2,
The side insertion guide member,
A non-contact inhibitor switch, characterized in that an inclined protrusion is formed on a surface facing one surface of the base plate to guide the insertion of the sensor assembly and then fix the sensor assembly. The method of claim 2,
The permanent magnet is installed on a protrusion protruding outward from the lower end of the moving block in a radial direction,
The magnetic sensor of the sensor assembly, a non-contact inhibitor switch, characterized in that facing the permanent magnet in a vertical direction. The method of claim 4,
The sensor assembly,
The magnetic sensor, the circuit protection element, a conductive connection portion connecting the magnetic sensor and the circuit protection element, and a sensor leg extending from the circuit protection element,
One end of the output terminal is exposed in the direction of the connector insertion part, the other end is exposed to the center of the base plate, and the other end is electrically connected to and welded to the sensor leg. The method of claim 1,
And an oil seal inserted into a groove formed on an outer circumferential surface of the shaft and partially exposed to the outside to contact the cover. The method of claim 6,
And a packing that is inserted into a circular groove formed on an upper surface of the actuator and partially exposed to the upper surface to contact a lower surface of the cover. The method of claim 1,
The base plate,
And at least one caulking rib on a surface on which the output terminal and the sensor assembly are mounted,
The output terminal and the sensor assembly are cold caulked using the at least one caulking rib to be fixed to the base plate. The method of claim 1,
The cover,
A seating portion protruding in the radial direction on the inner circumferential surface; And
Includes two cover stoppers protruding at an interval on the upper portion of the seating portion,
The moving block,
A non-contact inhibitor switch, comprising: a moving stopper protruding from an outer circumferential surface in a radial direction and installed between the two cover stoppers of the seating portion.

Images