KR100776584B1 - An inhibitor switch - Google Patents

Abstract

An inhibitor switch is provided to prevent wearing of components due to contact of the components by installing a non-contact sensor having a simple magnet, thereby increasing a lifespan of a product. A gear unit(200) includes a gear bar(210) installed in a housing and straightly moved, and a rotary gear(220) meshed with the gear bar to rotate the magnet. The gear bar is connected to a detent plate so that the gear bar and the detent plate are relatively moved. A printed circuit board(300) includes an inhibitor switch composed of plural hall elements located at positions corresponding to the magnets, and two Wheatstone's bridge sensor circuits(310) disposed at an orientation angle of 45 degrees.

Description

Inhibitor Switch {AN INHIBITOR SWITCH}

1A is a schematic perspective view of an inhibitor switch according to an embodiment of the present invention.

FIG. 1B is a schematic exploded perspective view of the inhibitor switch of FIG. 1A. FIG.

1C is a schematic cross-sectional view of the inhibitor switch of FIG. 1A.

FIG. 1D is a schematic partial cross-sectional view taken along the line I-I of FIG. 1C.

FIG. 1E is a schematic partial cross-sectional view taken along line II-II of FIG. 1A.

2A is a schematic conceptual diagram of a Wheatstone bridge sensor circuit and a magnet according to an embodiment of the present invention.

FIG. 2B is a schematic diagram illustrating waveforms of two sensor unit measurement signals output from the Wheatstone bridge sensor circuit of FIG. 2A.

3A to 3C are schematic cross-sectional views showing operating states of the detent plate and the gear unit according to a modification of the present invention.

* Description of the symbols for the main parts of the drawings *

100 ... housing 110 ... housing body

120 ... housing cover 200 ... gear

210 ... gear bar 220 ... rotating gear

300 ... printed circuit board 310 ... inhibitor magnetic sensor

The present invention relates to an inhibitor switch, and relates to an inhibitor switch having a non-contact sensor.

Vehicles, such as automobiles, have been added to a variety of functions that allow the user to provide a more stable and comfortable driving state beyond the function as a means of transportation, including a variety of configurations including electronic control of the engine and transmission as a key driving element of the vehicle The element is either electronic or in the process of becoming electronic.

On the other hand, the proportion of vehicles equipped with automatic transmissions is rapidly increasing for smooth and relaxed driving in a complex traffic situation in the city. When the driver sets a desired shift range through the shift lever, the driver's shift range is It is transmitted to the Transmission Control Unit (TCU) that controls the transmission, and various control units to control the power supply and cutoff when starting the vehicle, and to control the electric field such as setting, releasing and reversing the shift stage in the shift range set while driving. .

The driver's intention of the shift range through the shift lever is converted into an electrical signal through an inhibitor switch and transmitted to the various electronic components described above. Korean Laid-Open Patent Publication No. 2005-98617 discloses an inhibitor switch of a method of generating a corresponding shift range signal set by a driver through a connection with a plurality of contacts and a select lever. In the case of generating a shift range signal through such a contact between the contact point and the select lever, that is, a sliding contact between the fixed contact and the movable contact conductor, the physical contact between the contacts is not perfect, and the contact is caused by wear due to repeated use. There is a high possibility that a defect occurs, and when the connection between the contacts as a conductor is large, noise generation is large, so that electronic control through a central processing unit or the like is difficult using this.

Further, Japanese Patent Laid-Open Publication No. 55-101623 has a rotor in which a permanent magnet is mounted on a manual valve shaft, and a plurality of magnetic sensors arranged on the housing side of the automatic transmission in accordance with the corresponding transmission range are mounted. An inhibitor switch is disclosed. The inhibitor switch according to the related art has a structure in which a magnetic sensor must be attached to the housing for each position of the shift range, thereby making it difficult to utilize a design space for compacting the device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an inhibitor switch capable of eliminating or reducing the possibility of noise generation, poor contact, etc. due to physical contact, and compacting the device.

The present invention for achieving the above object, an inhibitor switch cooperating with the detent plate to rotate in accordance with the operation of the transmission lever, the housing portion; A gear part including a gear bar disposed in the housing part so as to be linearly movable and having one end connected to the detent plate so as to be able to move relative to the detent plate, and having a magnet on one side and rotating the magnet in engagement with the gear bar; ; A printed circuit board having an inhibitor switch magnetic sensor unit disposed at a corresponding position of the magnet and having a plurality of Hall elements and having two Wheatstone bridge sensor circuits arranged at a 45 degree orientation angle difference. Provide an inhibitor switch.

In the inhibitor switch, the gear bar is arranged to be movable inside the housing part, the gear bar body having a rack on one side, and one end of the gear bar body is disposed outside the housing part and the de It may also be provided with a gear bar head connected to the tent plate. The gear bar head may also have a detent connection for slidingly receiving a portion of the detent plate, the rotating gear comprising: a first stage pinion and a first stage pinion engaged with the rack; A pinion gear having a second stage pinion which is concentric but having a diameter smaller than the diameter of the first stage pinion, and a spur gear meshed with the second stage pinion, wherein the magnet is disposed on one surface. have.

In addition, the gear unit may further include a gear box housing for receiving the gear bar and the rotary gear, the gear bar body is provided with a gear bar body guide formed along the longitudinal direction of the gear bar body, the gear The box housing may be provided with a gear bar body guide engagement portion that engages with the gear bar body guide, wherein the rotating gear is: concentric with the first stage pinion and the first stage pinion that engages the rack, wherein the first A pinion gear having a second stage pinion having a diameter smaller than a diameter of the end pinion, and a spur gear meshing with the second stage pinion, wherein the spur gear has a spur gear mounting protrusion on which one side of the magnet is disposed; And a spur gear mounting hole for accommodating the spur gear mounting protrusion through the gear box housing. It may be.

The housing part may further include a housing extension part extending from one side from which the gear bar can be pulled out, a gear bar head receiving part partitioned by the housing extension part and accommodating the gear bar head. It is further provided with a locking tab movably mounted so as to be perpendicular to the direction of movement of the gear bar to one end, the gear bar head may further include a locking tab engaging portion engaged with the locking tab on one side, the magnet A dog is provided, and the rotation allowable angle of the magnet may be 90 degrees.

Hereinafter, an inhibitor switch according to the present invention will be described with reference to the drawings.

FIG. 1A shows a schematic perspective view of an inhibitor switch 10 according to one embodiment of the invention, FIG. 1B shows a schematic exploded perspective view of the inhibitor switch 10 of FIG. 1A, and FIG. 1C Is a schematic cross-sectional view of the inhibitor switch 10 of FIG. 1A.

The inhibitor switch 10 according to an exemplary embodiment of the present invention includes a housing part 100, a gear part 200, and a printed circuit board 300. The housing part 100 includes a gear part 200. And a printed circuit board 300 and the like are arranged. The gear part 200 includes a gear bar 210 and a rotary gear 220, the gear bar 210 is disposed so as to be linearly movable with respect to the housing part 100, and one end of the detent plate A (Fig. 3a) and the rotary gear 220 has a magnet 229 on one side and meshes with the gear bar 210 so that the linear motion of the gear bar 210 switches the rotary motion. 229). The printed circuit board 300 includes two Wheatstone bridge sensor circuits 310 on one surface of the printed circuit board 300 facing the magnets 229 at a position corresponding to the magnets 229. Two Hall elements and these bridge sensor circuits 310 are formed such that their orientation angles are different from each other by 45 °, so that the voltage signal generated by the change in the magnetic field generated as the magnet 229 rotates has a constant phase. Have a difference. Here, the difference in the orientation angles means a skewed angle between alignments of the bridge sensor circuits arranged.

First, the housing 100 according to an embodiment of the present invention accommodates other components such as the gear unit 200 and the printed circuit board 300, and the housing 100 includes the housing body 110 and the housing cover ( 120 may include a housing coupling groove 115 and a housing coupling protrusion 125 formed at the ends of the housing body 110 and the housing cover 120 to form the housing body 110 and the housing cover 120. The coupling can be facilitated. In addition, the housing body 110 and the housing cover 120 may be coupled through the housing coupling member 130. When the coupling is made through the housing coupling member 130, the housing body 110 and the housing cover 120 may be combined. At least a portion of the gear unit 200 and the printed circuit board 300 disposed in the space formed by the above may have a structure that is fastened together for stable mounting. One side of the housing body 110 is provided with a connector mounting groove 113 for mounting and discharging the connector 320 mounted on the printed circuit board 300 to be described below. In addition, the outer side of the housing body 110 may be further provided with a bushing hole 117 for mounting the inhibitor switch device according to the present invention to other external components.

The gear unit 200 may include a gear bar 210 and a rotation gear 220, and the gear bar 210 may include a gear bar head 211 and a gear bar body 217. The gear bar body 217 is movably disposed in a space formed by the housing body 110 and the housing cover 120 of the housing part 100. That is, the gear bar body 217 may be linearly displaced with respect to the housing part 100 in the longitudinal direction of the gear bar body 217 when an external force is applied.

On the outside of the gear bar body 217 is provided a rack 218 that can be engaged with the rotary gear 220. The linear displacement movement of the gear bar body 217 is converted into the rotational movement of the rotary gear 220 by gear engagement of the rack 218 and the rotary gear 220. A gear bar head 211 is disposed at one end of the gear bar body 217 exposed to the outside of the housing part 100, and the gear bar head 211 is coaxial with a rotation axis of a transmission lever (not shown). It rotates together with the rotation of the transmission lever and is connected to the detent plate (A, see FIG. 3) having several shift range protrusions on one side so as to be capable of relative movement. That is, as shown in Figure 1b, the gear bar head 211 is formed with a detent connecting portion 213 provided in the form of a rectangular straight through-hole or groove. The detent connecting protrusion C protruding from one surface of the detent plate A is movably inserted into the detent connecting portion 213 in the detent connecting portion 213. In the present embodiment, the detent connecting portion 213 is shown as being of the female type and the detent protrusion formed on the dedent plate is formed as the male type, but the present invention is not limited thereto. That is, in contrast to the present embodiment, a through hole for connection may be formed in the detent plate and a projection for connection may be formed in the gear bar head. In addition, the detent connector 213 is formed of a rectangular straight through hole, but is not limited thereto, and various modifications are possible, such as a curved through hole capable of more smoothly working with the detent connector and the detent protrusion.

The rotary gear 220 meshes with the gear bar 210 to convert the linear motion of the gear bar 210 into a rotary motion. One side of the rotary gear 220 is provided with a magnet 229 to rotate the gear 200 and the rotary gear 200. The magnet 229 may also rotate together. The rotary gear according to the present invention may be formed of a single spur gear having a magnet on one side and engaged with the rack of the gear bar body. However, the rotary gear 220 in the present embodiment may have a pinion gear 223 and a spur gear. 221. The pinion gear 223 has a two-stage first-stage pinion 225 and a second-stage pinion 227, the first-stage pinion 225 is fitted with the rack 218 of the gear bar body 217. The second stage pinion 227 is concentric with the first stage pinion 225 but has a diameter larger than the diameter of the first stage pinion 225. The spur gear 221 meshes with the second stage pinion 227 of the pinion gear 223, and a magnet 229 is disposed on one surface of the spur gear 221 toward the printed circuit board 300. For example, the rack 218 of the gear bar body 217, the spur gear 221, the first stage pinion 225 and the second stage pinion 227 of the pinion gear 223 may have the following relationship. .

Number of teeth Gear ratio Rack 24 One Spur gear 48 0.5 1st stage pinion 12 2 2nd stage pinion 24 One

Accordingly, through the gear ratio as described above, the linear movement displacement of the rack 228, that is, the linear movement displacement for securing a shift range such as P, R, N, D, and L, is determined by the magnet 229 of the spur gear 221. The allowable angle of rotation can be limited to 90 °. The rotational motion conversion of the linear motion through the spur gear and pinion gear can minimize the vibration generated during the movement of the gear bar to minimize the occurrence of disturbance due to the vibration to eliminate or reduce the possibility of malfunction.

In some cases, two spur gears and a magnet of the rotary gear may have a structure provided with two, but it is preferable to configure a single number for the compactness of the switch according to the increase in design space efficiency.

Meanwhile, the gear unit 200 of the inhibitor switch 10 according to the present invention may further include a gear box housing 230. That is, the gear box housing 230 includes a gear box housing body 231 and a gear box housing cover 235, and gears in a space formed by the gear box housing body 231 and the gear box housing cover 235. By arranging the bar 210 and the rotary gear 220, the operation of the gear part 200 is minimized the possibility of an operation error caused by interference with other components, for example, due to external impact, thereby enabling more stable operation. do.

In particular, the gear box housing body 231 and the gear box housing cover 235 of the gear box housing 230 may further include a mounting structure capable of stably supporting the rotating gear 220. That is, as shown in FIG. 1B, the gear box housing body 231 and the gear box housing cover 235 have spur gear mounting grooves 232 and 238 and pinion gear mounting groove 233, respectively. The spur gear 221 and the pinion gear 223 are provided with a spur gear mounting protrusion 222 and a pinion gear mounting protrusion 224, respectively, and the spur gear 221 and the pinion gear 223 are provided. It is also possible to achieve a stable rotational movement in the gear box housing 230. In particular, the spur gear mounting groove 238 may have a penetrating structure, and the spur gear mounting protrusion 222 may have a suitable diameter so that the magnet 229 may be exposed toward the printed circuit board 300. .

In addition, the gear bar body guide 219 and the gear bar body guide engaging portion 237 may be further provided so that the linear displacement movement of the gear bar body 217 may be more stably performed. That is, as shown in FIG. 1D, which is a schematic cross-sectional view taken along the line I-I of FIG. 1C, the gear bar body 217 is provided with a groove bar type gear bar body guide 219 and moves to a corresponding position thereof. The gear box housing cover 235 is provided with a gear bar body guide engaging portion 237 that can be engaged with the gear bar body guide 219. Therefore, when the gear bar 217 is linearly displaced by the interaction between the gear bar body guide 219 and the gear bar body guide engaging portion 237, the gear bar body 217 having a large aspect ratio in the longitudinal direction is provided. By guiding, more stable movements are possible, and the function of limiting linear displacement of the gear bar body may be performed.

In the present embodiment, the guide structure for guiding the gear bar body is illustrated as being formed in the gear bar body and the gear box housing cover, respectively, in a female / male type, but is not limited thereto. In contrast, the guide structure may be formed in the male / female type. Various modifications are possible, such as the mounting position of the structure may take a structure formed in the gear bar body and the gear box housing body.

The printed circuit board 300 includes an inhibitor switch magnetic sensor unit 310 at a position corresponding to the magnet 229 on one surface facing the gear unit 200. As shown in FIG. 2A, the inhibitor switch magnetic sensor unit 310 includes two adjacent Wheatstone bridge sensor circuits 311 and 313, and each Wheatstone bridge sensor circuit 311 and 313 includes a plurality of Hall elements 315. Take the same circuit configuration with), but the orientations of the two Wheatstone bridge sensor circuits 311 and 313 are arranged to have a 45 ° orientation angle difference with respect to each other. Here, Vcc1 and Vcc2 represent supply voltages applied to respective Wheatstone bridge sensor circuits, GND1 and GND2 represent ground voltages for respective circuits, and +/- Vo1 and Vo2 represent respective Wheatstone bridge sensor circuits. Positive / negative output voltage.

Each Wheatstone bridge sensor circuit 311 and 313 has the same structure, but one Wheatstone bridge sensor circuit 311 and the other Wheatstone bridge sensor circuit 313 connect two nodes that are not adjacent to each other in the circuit. The angle of intersection between the diagonals is 45 °. Therefore, when the magnet 229 of the circuit gear 220 disposed to face the whistle bridge sensor circuits 311 and 313 performs a rotational motion, two sensor unit measurement signals due to the positive / negative output voltage of FIG. X and Y are detected, and the two sensor unit measurement signals X and Y have a constant phase difference but have almost the same waveform. The sensor part measurement signal according to the rotation angle of the magnet 229 has the following relationship.

Here, when the influence on the temperature T is significantly smaller than the influence on the angle θ, the relationship can be expressed as follows.

When the rotation angle θ of the magnet 229 is calculated from the relations, it can be expressed as the following relation.

Therefore, the rotation angle θ of the magnet 229 may be calculated through the measured signals of the two inhibitor switch sensors.

On the other hand, the housing portion of the inhibitor switch according to another embodiment of the present invention may further include a gear bar head receiving portion that can accommodate the gear bar head of the gear bar. As illustrated in FIG. 1B, a housing extension part in which the gear bar 210 extends in a retractable direction is formed at one side of the housing body 110 and the housing cover 120 of the housing part 100, and by the housing extension part. Gear bar head receiving portions 111 and 121 are provided. The gear bar head receiving parts 111 and 121 include a gear bar head body receiving part 111 formed in the housing body 110 and a gear bar head cover receiving part 121 formed in the housing cover 120. Through such a gear bar head receiving portion structure, for example, when the shift range is P, when the gear bar body is completely accommodated in the housing, the gear bar head is stably guided so that the gear bar Deformation and the like can also be prevented. In addition, when the gear bar head receiving portion is formed through the housing extension, the locking tab may be movably mounted to the housing extension. That is, as shown in FIG. 1E, which is a cross-sectional view taken along the line II-II of FIG. 1A, the locking tab 400 includes a locking tab body 410 and a locking tab locking portion 420. 420 is mounted to the locking tab receiving portion 119 formed at one end of the housing extension of the housing body 110 so as to be movable in a direction perpendicular to the moving direction of the gear bar 210. Locking tab locking portion 420 of the locking tab 400 when the gear bar body 217 is completely accommodated in the housing portion 100 and the gear bar head 211 is accommodated as the gear bar head receiving portions 111 and 121 to one side. The locking tab engaging portion 215 is formed at the corresponding position of. Therefore, when the locking tab 400 moves in the vertical direction and one end of the locking tab engaging portion 420 of the locking tab 400 is accommodated in the locking tab engaging portion 215, the linear displacement movement of the gear bar 210 is performed. Can be limited, so that the shift of the shifting tap from the shifting range P state to another shifting range state requires the release of the locking tab by the user to enable stable shifting.

Hereinafter, an operation process of the inhibitor switch according to the present invention will be described with reference to FIGS. 3A to 3C. FIGS. 3A to 3C illustrate the foregoing embodiment except that the rotating gear has a single spur gear configuration. All components have the same configuration as described in. As shown in FIG. 3A, a plurality of detents are formed at one end of the detent plate A disposed coaxially with the rotation axis center O of the transmission lever (not shown), each of which is, for example, P A shift range such as R, N, D, and L is maintained, and the shift range is maintained by elastic engagement with the detent roller B connected to one end of the detent spring (not shown). A detent protrusion C is formed at one side of the detent plate A, which is in sliding engagement with the detent connecting portion 213 of the gear bar head 211.

When the driver wants to change the shift range, the shift lever (not shown) is rotated, and the detent plate A also rotates with respect to the center O as the shift lever rotates. At this time, the detent protrusion C rotates in a radius of the distance rc from the center of the detent plate O to the detent protrusion C, and the detent connecting portion 213 to allow relative sliding movement. The detent protrusion C meshed with is moved in the detent connecting portion 213. As various shift ranges are set by the driver, as shown in FIGS. 3B and 3C, the gear bar head 211 of the gear bar 210 linearly moves by various distances lc 1 and lc 2. At this time, the rotary gear 220 meshing with the rack formed on the gear bar body of the gear bar 210 is rotated by a distance corresponding to the linear displacement of the gear bar 210, so that the magnet mounted to the rotary gear 220 ( 229) is also rotated by the same angular displacement. At this time, a Wheatstone having a 45 ° orientation angle difference between the inhibitor magnetic sensor units 310 formed on the printed circuit board 300 (see FIGS. 1B and 2A) adjacent to the magnet 229 and having Hall elements. Two sensor part measurement signals are generated by the rotation of the magnet 229 from the bridges 311 and 313, and the two sensor part measurement signals are output to the external electric element along the connector 320 of the printed circuit board 300. .

The above embodiments are examples for describing the present invention, but the present invention is not limited thereto. That is, in the above embodiments, the rotary gear according to the present invention may take a singular configuration, and may include an changed shift range other than P, R, N, D, and L, and the like. The two Wheatstone bridge sensor circuits have a 45 ° orientation difference from each other through a gear part that converts the rotational motion of the detent plate into the linear motion of the gear bar and then to the rotational motion of the magnet and the magnetic field of the rotating magnet. Through the two sensor circuit output signals output from the controller, various modifications are possible in the range where the shift range can be checked by the driver.

The inhibitor switch according to the present invention having the configuration as described above has the following effects.

First, the inhibitor switch according to the present invention, by providing a non-contact sensor having a simple magnet, by excluding wear due to the contact of the components, it is possible to increase the durability of the product.

Second, the inhibitor switch according to the present invention, by simplifying the design structure taking a simple structure of the rack / pinion, by reducing the material cost of reducing the number of components and the process cost of reducing the number of assembly processes, productivity It may be accompanied by effects.

Third, the inhibitor switch according to the present invention is capable of designing various types of inhibitor switches required for transmissions of various vehicle types through simple design changes such as changing gear ratios to rotating gears, and thus, variability and application of the inhibitor switch design. You can also maximize sex.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (10)

In the inhibitor switch cooperating with the detent plate that rotates in response to the operation of the transmission lever, A housing part; A gear part including a gear bar disposed to be linearly movable in the housing part and having one end connected to the detent plate so as to be able to move relative to the detent plate, and having a magnet on one side and a rotating gear to rotate the magnet in engagement with the gear bar; And a printed circuit board including an inhibitor switch magnetic sensor unit disposed at a corresponding position of the magnet and having a plurality of Hall elements and having two Wheatstone bridge sensor circuits arranged at 45 ° orientation angle differences. Inhibitor switch. The method of claim 1, The gear bar is: A gear bar body disposed movably in the housing part and having a rack on one side; And a gear bar head disposed outside the housing part and connected to the detent plate at one end of the gear bar body. The method of claim 2, And the gear bar head has a detent connection portion for slidably receiving a portion of the detent plate. The method of claim 2, The rotary gear is: A pinion gear having a first stage pinion engaged with the rack and a second stage pinion concentric with the first stage pinion and having a diameter smaller than that of the first stage pinion; And a spur gear engaged with the second stage pinion and having the magnet disposed on one surface thereof. The method of claim 2, The gear switch further comprises a gear box housing for receiving the gear bar and the rotary gear. The method of claim 5, The gear bar body is provided with a gear bar body guide formed along the longitudinal direction of the gear bar body, the gear box housing is characterized in that the gear bar body guide engaging portion which is engaged with the gear bar body guide is provided switch. The method of claim 5, The rotary gear is: A pinion gear having a first stage pinion engaged with the rack and a second stage pinion concentric with the first stage pinion and having a diameter smaller than that of the first stage pinion; A spur gear meshing with the second stage pinion, The spur gear is provided with a spur gear mounting projection that the magnet is disposed on one surface, And the gear box housing has a spur gear mounting hole for receiving the spur gear mounting protrusion therethrough. The method of claim 2, And the housing part further comprises a housing extension part extending from one side of which the gear bar can be pulled out, and a gear bar head receiving part partitioned by the housing extension part and accommodating the gear bar head. The method of claim 8, And a locking tab movably mounted to one end of the housing extension to be perpendicular to a movement direction of the gear bar, wherein the gear bar head further includes a locking tab engaging portion engaged with the locking tab on one side. Inhibitor switch. The method of claim 1, The magnet is provided with a singular dog, the rotor switch, characterized in that the rotation allowable angle of 90 °.

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