KR100247663B1 - Sensor for car speed - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed sensor, and more particularly, generates an electric pulse signal proportional to the speed of a rotating body which receives rotation from a transmission (transmission) installed between an engine and a drive wheel. The present invention relates to a vehicle speed sensor, which is a device that outputs to a speed meter so that the human eye can see the speed of the vehicle, and an electric pulse signal proportional to the rotation of the driven gear and the driven gear rotating body which receives rotation from the transmission. It is easy to assemble and structure by reducing the number of parts by integrating a speed sensor that outputs to a meter set connected through a cable by generating a cable, and it is particularly related to a vehicle speed sensor that can reduce manufacturing costs. .

Description

Car speed detection sensor

The present invention relates to a vehicle speed sensor, and more particularly, to generate an electric pulse signal in proportion to the rotational speed of the driven gear and the driven gear rotating body by receiving rotation from the transmission. The present invention relates to a vehicle speed sensor that can be easily assembled and structured and can significantly reduce a defective rate by integrating a speed sensor that outputs to a set of meters connected through the integrated circuit.

In general, the speed sensor of the vehicle receives the rotation from a transmission (transmission) installed between the engine and the drive wheel, generates an electric pulse signal proportional to the rotational speed of the rotating body, and visually generates the speed of the vehicle. It is a device that outputs to the speed meter so that you can see.

Such a vehicle speed sensor conventionally receives a rotation from a gear of a transmission installed between an engine and a drive wheel, and detects the rotation speed of the driven gear and the driven gear to generate an electric pulse signal to generate a set of meters connected to the cable. After manufacturing each of the speed sensor to deliver was configured by fitting the female thread formed on the speed sensor and the male thread formed on the driven gear.

This will be described in detail with reference to the accompanying drawings 1 to 2 as follows.

1 is a perspective view of a conventional vehicle speed sensor, Figure 2 is a cross-sectional view taken along the line A-A showing the internal structure of FIG.

The speed sensor 30 is configured by the driven gear 10 and the speed sensor 20 are inserted.

First, referring to the structure of the driven gear 10, the driven gear housing 136 is provided with a fastening hole 136a and a ring groove 136b on the outside thereof and an accommodation groove 136c on the inner side thereof.

The fastening hole 136a is a hole for penetrating the fastening member when the speed sensor 30 is fastened to the transmission device.

A shaft 102 is inserted into the driven gear housing 136 to protrude, and the gear 104 is extrapolated and fixed to the shaft 102 protruding to the outside.

A bearing 108 is extrapolated to the shaft 102 in the inner portion of the driven gear housing 136 of the accommodating groove 136c to smoothly rotate the shaft 102, and the ring ring 136b has an O-ring 124. This extrapolation prevents the mission oil from spilling out.

On one side of the driven gear housing 136 where the shaft 102 protrudes, a stop pin 138 (Stop Pin) is inserted perpendicular to the direction of the shaft 102 to prevent the shaft 102 from escaping and the other outer peripheral surface thereof. Male threads are formed.

In addition, a connection groove 102a is formed at one side of the shaft 102 accommodated in the accommodation groove 136c.

Looking at the next speed sensor 20, the receiving groove 116b of the PCB housing 116 in which the receiving grooves 116a and 116b are formed at both sides is accommodated the PCB 114 for generating an electrical pulse signal, the other receiving groove A terminal 118 connected to the PCB 114 is received through the PCB housing 116 at 116a.

An accommodating groove 130a is formed at one side and an female screw portion is formed at the other inner circumferential surface thereof so that the oilless bearing housing 130 is fitted with the male screw portion formed at the outer circumferential surface of the driven gear housing 136 and the PCB housing 116. Ultrasonic fusion is combined.

The oilless bearing 128 is interpolated and fixed in the oilless bearing housing 130, and the rotor 126 which interpolates and fixes the connecting rod 134 into the oilless bearing 128. (Roter) is penetrated and protrudes into the receiving groove 130a.

A portion of the connecting rod 134 is received and fixed in the connecting groove 102a formed in the shaft 102, so that rotation of the shaft 102 is transmitted to the rotor 126.

The magnet 122 of the multi-pulse magnet is fixed inside the rotor 126 in the rotor 126 accommodated in the receiving groove 130a.

Here, the multi-pulse magnetization magnet 122 means that the magnets are equally magnetized by alternating the N pole and the S pole along the direction of the circle to the ring-shaped magnet.

The seat 107 (Sheet) is interposed between the oilless bearing 128 and the rotor 126 to prevent wear due to rotation, and the driven gear housing 136 and the oilless bearing housing 130 are coupled to each other. A cushion 132 (Cushion)) is interposed at the tip of the driven gear housing 136 having a male thread formed therein to prevent loosening due to vibration and prevent the mission oil from flowing out.

The operation of the speed sensor having the above-described structure is as follows.

First, when the gear 104 is rotated by receiving rotation from a gear (not shown) of the transmission engaged with the gear 104, the shaft 102 connected to the shaft, the connecting rod 134, the rotor 126, and the magnet ( 122) rotates in the same direction and at the same speed.

The magnet 122 has a multi-pulse magnetization, and the PCB 114 generates an electrical pulse signal in proportion to the rotation speed of the magnet 122.

In other words, if the rotation speed is high, a lot of electrical pulse signals are generated, and if it is slow, little electrical pulse signals are generated.

This electrical pulse signal is output to a set of meters via a cable connected to terminal 118 via terminal 118.

However, since the conventional vehicle speed sensor is manufactured by separately manufacturing the driven gear and the speed sensor, a large number of parts is expensive and takes a long time to assemble and has a complicated structure.

The present invention has been made in order to solve the above-mentioned problems, by integrating the driven gear and the speed sensor to greatly reduce the number of parts, the assembly and structure is simple and can reduce the defective rate, the automobile can reduce the manufacturing cost The purpose is to provide a speed sensor.

In order to achieve the above object, the present invention is a vehicle speed sensor for rotating and driven by the transmission to generate an electrical pulse signal proportional to the rotational speed, the gear and bearing for transmitting the rotation of the transmission and The magnet is extrapolated to the shaft which is the rotation axis, the gear is fixed by the snap ring and the magnet is fixed integrally with the shaft; A bearing housing in which the bearing is extrapolated and fixed and a receiving groove in which the magnet is accommodated is formed, a protrusion into which a bush is inserted is formed, and an O-ring is extrapolated; A PCB housing in which a terminal connected to a PCB generating an electric pulse signal in proportion to the rotational speed of the magnet is penetrated and a receiving groove is formed to accommodate the PCB; An object of the present invention is to provide a vehicle speed sensor, which is assembled by ultrasonic welding.

1 is a perspective view of a conventional vehicle speed sensor.

2 is a cross-sectional view taken along the line A-A showing the internal structure of FIG.

3 is a perspective view of a vehicle speed sensor according to the present invention.

4 is a cross-sectional view taken along the line A-A showing the internal structure of FIG.

<Explanation of symbols for main parts of drawing

10: driven gear 20: speed sensor

30: speed detection sensor 102: shaft

104: gear 106: sheet

108: bearing 110: bearing housing

112: bush 114: PCB

116: PCB housing 118: terminal

120: snap ring 122: magnet

124: O-ring 126: rotor

128: oilless bearing 130: oilless bearing housing

132: cushion 134: connecting rod

136: driven gear housing 138: stop pin

140: oil feedback hole 142: protrusion

Hereinafter, the present invention will be described with reference to FIGS. 3 to 4. 3 is a perspective view of a vehicle speed sensor according to the present invention, Figure 4 is a cross-sectional view taken along the line A-A showing the internal structure of FIG.

First, the basic configuration of the present invention, in the vehicle speed detection sensor that rotates driven by the transmission and generates an electrical pulse signal proportional to the rotational speed, the gear 104 and the bearing for transmitting the rotation of the transmission 108 and the magnet 122 are extrapolated to the shaft 102 which is the rotation axis, wherein the gear 104 is fixed by the snap ring 120 and the magnet 122 is fixed integrally with the shaft 102; The bearing 108 is extrapolated and fixed, and the receiving groove 110a is formed to accommodate the magnet 122, a protrusion 142 is formed to be inserted into the bush 112, the bearing housing is O-ring 124 is extrapolated ( 110); A PCB housing having a terminal 118 connected to the PCB 114 that generates an electrical pulse signal in proportion to the rotation speed of the magnet 122, and having a receiving groove 116a in which the PCB 114 is accommodated. 116); Ultrasonic welding is characterized in that assembled.

A seat 106 is interposed between the bearing 108 and the gear 104.

This is to prevent wear of the gear 104 and the bearing 108 due to the rotation of the shaft 102 and to maintain a constant separation distance between the magnet 122 and the PCB 114.

In addition, the bearing housing 110 is characterized in that the oil feedback hole 140 is formed.

This is to prevent the high temperature and pressure generated inside the transmission when the vehicle is driven so that the mission oil is introduced into the PCB 114 along the shaft 102 and the speed sensor 30 is not malfunctioned.

That is, the mission oil rising along the shaft 102 to the receiving groove 110a is discharged downward along the oil feedback hole 140 by its own weight, thereby preventing the mission oil from flowing into the PCB 114. do.

In addition, a step 111 is formed outside the bearing 108.

This is because the bearing 108 should be fixed to the bearing housing 110 when the shaft 102 rotates, but to prevent it from being fixed and outwardly.

Looking at the action of the speed sensor 30 of the above-described structure receives the rotation from the transmission device, when the gear 104 rotates to rotate the shaft 102 as a rotation axis and the magnet 122 is integrally formed with the shaft 102 ) Will rotate accordingly.

The magnet 122 has a multi-pulse magnetization, and according to the rotational speed of the magnet 122, the PCB 114 generates an electrical pulse signal.

This electrical pulse signal is output to a set of meters via a cable connected to the terminal 118 through the terminal 118, and the speed of the car is visible to the human eye.

As described above, the present invention can detect a vehicle speed without using a rotor, an oilless bearing, an oilless bearing housing, a cushion, a connecting rod, a stop pin, and the like, which are components of a conventional speed sensor, and conventionally It eliminates the process of assembling and fitting the separately formed male and male parts.

As described above, the present invention is a useful invention that can reduce the manufacturing cost by simplifying the assembly and structure and reducing the defective rate by greatly reducing the number of parts by integrally driving the driven gear and the speed sensor.

Claims (4)

In a vehicle speed sensor which is driven by a transmission and rotates and generates an electric pulse signal proportional to the rotational speed, the gear 104, the bearing 108, and the magnet 122 transmitting the rotation of the transmission are Extrapolated to the shaft 102, which is a rotational axis, wherein the gear 104 is fixed by the snap ring 120 and the magnet 122 is fixed integrally with the shaft 102; The bearing 108 is extrapolated and fixed, and the receiving groove 110a is formed to accommodate the magnet 122, a protrusion 142 is formed to be inserted into the bush 112, the bearing housing is O-ring 124 is extrapolated ( 110); A PCB housing having a terminal 118 connected to the PCB 114 that generates an electrical pulse signal in proportion to the rotation speed of the magnet 122, and having a receiving groove 116a in which the PCB 114 is accommodated. 116); Vehicle speed sensor, characterized in that the ultrasonic welding. The vehicle speed sensor according to claim 1, wherein a seat (106) is interposed between the bearing (108) and the gear (104). The vehicle speed sensor according to claim 1 or 2, wherein an oil feedback hole (140) is formed in the bearing housing (110). The vehicle speed sensor according to any one of claims 1 to 3, wherein a step (111) is formed outside the bearing (108).

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