JPH0686007U - Position sensor - Google Patents

Abstract

(57) [Summary] [Purpose] To correct the inclination of the element when the position sensor is assembled. [Structure] An element 20 including a resistor 21 is placed on a casing 30. The rotor 10 that rotates together with the detected object is attached to the cover 40. In the assembled state,
The brush 11 provided on the rotor 10 is in sliding contact with the resistor 21 of the element 20. An arm member 43 is provided on the casing 30 side of the cover 40. When the cover 40 is fitted into the casing 30, the arm member 43 abuts on the element 20 separated from the receiving portion 33, and the receiving portion 3
It is abutted on the 3 side to correct the inclination of the element 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a position sensor that detects displacement such as a linear movement distance or opening / closing degree of an object to be detected.

[0002]

[Prior art]

 For example, in a position sensor that detects the opening of a throttle valve of a vehicle or the like, a brush is fixed to the rotor that interlocks with the opening / closing operation of the throttle valve, and the brush slides on a resistor provided in the element. By doing so, a voltage corresponding to the opening of the throttle valve is output.

In a general position sensor including this throttle position sensor, an element including a resistor, a rotor for fixing a brush, a slider, and the like are housed inside a casing, and a cover is fitted to this casing. .

By the way, in assembling this sensor, before attaching the cover to the casing, a lead wire (or a lead plate) extending from the resistor is welded to an element terminal embedded in the casing to position sensor. It must be possible to make an electrical connection between the device and external equipment.

FIG. 5 shows a state in which the element terminal and the resistor element of the element are connected via a lead wire prior to the mounting of the cover (not shown). In this figure, a casing 20 is provided in a casing 30, and a lead plate 22 extends from a resistor 21 provided on the surface of the element 20 and is connected to an element terminal 23.

[0006]

[Problems to be solved by the device]

 However, in this position sensor, when the lead plate 22 is welded to the element terminal 23, if the terminal voltage of the welding device is too high, or the current value becomes excessive, the lead plate 22 is There is a risk of bending deformation due to welding heat that has risen too much. As a result, in the state where the cover is assembled thereafter, as shown in FIG. 6, a part of the element 20 is lifted by the lead plate 22 and lifted up from the receiving portion 33 (a part of the casing 30) of the casing 30. It may be incorporated as it is, and the sliding of the rotor on the resistor 21 may not be smooth.

The present invention has been made in view of the above problems, and an object thereof is to prevent the element from being assembled in a state inclined with respect to the casing in the assembly of the position sensor.

[0008]

[Means for Solving the Problems]

 The position sensor according to the present invention is an element that includes a moving body that interlocks with the movement of a detected body, a casing that houses the moving body, and a resistor that is disposed between the casing and the moving body and that faces the moving body. A brush that is fixed to the side of the moving body that faces the element and that is in sliding contact with the resistor, and a cover that fits into the casing. It is characterized in that an arm member for contacting the element to bring the element into contact with the casing is provided.

[0009]

【Example】

 Hereinafter, the position sensor of the present invention will be described as an example of a throttle position sensor that detects the opening of a throttle valve. 1 and 2 are sectional views showing a throttle position sensor according to an embodiment of the present invention. FIG. 1 shows a temporarily assembled state of elements, and FIG. 2 shows a completed state thereof.

A brush 11 is fixed to a moving body that interlocks with a throttle valve (not shown), that is, the rotor 10. This brush 11 slides on the resistor 21 printed on the element 20 due to the rotation of the throttle valve, whereby a voltage corresponding to the opening of the throttle valve is output. The rotor 10, the brush 11, and the element 20 (including the resistor 21) are housed together in a casing 30, and a cover 40 is fitted to the casing 30.

The rotor 10 is fitted into a through hole 41 provided in the cover 40, and is supported rotatably about an axis Q. A connecting member (not shown) that interlocks with the opening / closing operation of the throttle valve is fitted to the rotor 10, and the rotor 10 interlocks with the opening / closing operation of the throttle valve via this connecting member. It rotates about the axis Q so as to twist the spring 50 provided between and. The rotor 10 is biased downward in the figure by a spring 50, and the spring force of the spring 50 causes a rotor stopper 12 projecting on the axis Q to abut against a rotor receiver 34 projecting from the casing 30, and The brush 11 makes sliding contact with the resistor 21 of the element 20. The rotor stopper 12 is provided at the center of the rotor 10 so that its center is exactly aligned with the axis Q of the rotor 10.

As shown in FIG. 1, the element 20 is provided with a hole 23 through which the rotor receiver 34 penetrates, and in the temporarily assembled state, the casing 30 is projected from three directions perpendicular to the axis Q of the rotor 10. The part 31 is engaged. As a result, the element 20 is positioned so that the printing center (not shown) of the resistor 21 is exactly aligned with the axis Q of the rotor 10.

The protrusions 31 are provided on the bottom surface 32 of the casing 30 at predetermined intervals in the circumferential direction, and are provided with an inner wall surface 35 with a gap 36 therebetween. When the cover 40 is fitted in the casing 30, the claws 44 provided in the cover are fitted into the gaps 36, respectively.

When the claws 44 of the cover 40 are fitted into the gaps 36, the protrusions 31 of the casing 30 are curved toward the center of the casing 30. As a result, the position of the element 20 is restricted by the protrusions 31 that are engaged from three directions perpendicular to the axis Q of the rotor 10, and the printing center of the resistor 21 is accurately aligned with the axis Q of the rotor 10. Be done.

A connector hole 37 for inserting a connector of an external device (or an external power source) (not shown) is formed on the side of the casing 30, and an element terminal 38 is provided inside the connector hole 37. There is. The element terminal 38 is joined to the lead plate 22 extending from the resistor 21 by welding. In FIG. 1, the lead plate 22 is bent and deformed by the welding condition (for example, the terminal voltage of the welding machine becomes excessive), and the element 20 is separated from the receiving portion 33 of the casing 30. It is shown that it has tilted with respect to the casing bottom surface 32.

A stopper portion 14 is provided on the side of the rotor 10 facing the cover 40. The stopper portion 14 is provided on the cover 40 by the spring force of the spring 50 in the temporarily assembled state of the element shown in FIG. 1, that is, in the state where the rotor 10 is inserted into the through hole 41 of the cover 40 to a predetermined position. It is locked to the protrusion (not shown) of the locking portion 42. As a result, the rotor 10 is integrally connected to the cover 40 and its movement is restricted. In the state where the cover 40 is fitted in the casing 30 (completed state shown in FIG. 2), the stopper portion 14 makes the protrusion of the locking portion 42 of the cover 40 due to the rotor stopper 12 contacting the rotor receiver 34. It is displaced toward the cover 40 side. This allows the rotor 10 to rotate about the axis Q.

An arm member 43 is provided on the side of the cover 40 facing the casing 30 so as to come into contact with the element 30 inclined with respect to the casing bottom surface 32 when the cover 40 is fitted into the casing 30. As shown in FIG. 2, the length of the arm member 43 along the axis Q direction is such that the tip of the arm member 43 has the receiving portion 33 when the cover 40 is pushed into the casing 30 up to the regular fitting position. It is set in advance so as to be located at a position apart from the casing bottom surface 32 by the sum of the height of the element 20 and the thickness of the element 20.

FIG. 3 is a front view of the cover 40 on the casing side showing the arrangement of the arm member 43, and FIG. 4 is a front view of the element 20 abutted against the element receiving portion 33 of the casing 30 by the arm member 43. It is a figure.

As shown in these drawings, the arm members 43 are provided on both sides of the four lead plates 22 extending from the resistor 21 of the element 20, that is, on the edges of the rectangular portion 40 a of the cover 40, respectively. . That is, in FIG. 4, the hatched portion indicated by the symbol A is the acting portion of the arm member 43 on the element 30, and by pushing this, the inclination of the element 20 is corrected and the element 20 is against the casing bottom surface 32. Are substantially parallel to each other, and the bending of the four lead plates 22 is prevented.

A method of assembling the throttle position sensor of this embodiment will be described. As shown in FIG. 1, first, the element 20 is placed on the receiving portion 33 of the casing 30 by passing the rotor receiving portion 34 of the casing 30 through the hole 23 formed in the center of the element 20. In this state, the lead plate 22 of the element 20 is welded to each of the element terminals 36.

Next, the rotor 10 and the spring 50 are temporarily assembled to the cover 40. That is, the rotor 10 is fitted into the through hole 41 of the cover 40 to a predetermined position with the spring 50 arranged between the rotor 10 and the cover 40. As a result, the stopper 14 of the rotor 10 engages with the locking portion 42 of the cover 40, and the rotor 10 and the spring 50 are temporarily assembled to the cover 40.

From this state, the cover 40 is fitted into the casing 30. At this time, even if the element 20 is separated from the receiving portion 33 and the lead plate 22 is largely curved and deformed toward the cover 40 side, the arm member 43 of the cover 40 contacts the element 20, so that the element 20 is It is pushed toward the bottom surface 32 side of the casing 30 and comes into contact with the receiving portion 33.

Further, along with this, the rotor stopper 12 of the rotor 10 contacts the rotor receiving portion 34 and is pushed in the direction of compressing the spring 50, so that the stopper portion 14 of the rotor 10 is locked to the locking portion of the cover 40. It is released from 42 protrusions. After that, the space between the casing 30 and the cover 40 is closed by the sealing resin 51, whereby the assembly is completed.

As described above, according to the present embodiment, since the cover 40 is provided with the arm member 43, the inclination of the element 30 due to the variation in the welding conditions is corrected with the fitting of the cover 40. Therefore, it is possible to ensure smooth rotation of the rotor 10 after assembly.

[0025]

[Effect of device]

 As described above, according to the present invention, it is possible to prevent the element from being incorporated while being inclined with respect to the bottom surface of the casing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a temporarily assembled state of a throttle position sensor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a completed state of the throttle position sensor of FIG.

FIG. 3 is a front view of a cover that constitutes the throttle position sensor of FIG.

FIG. 4 is a front view of elements forming the throttle position sensor of FIG.

FIG. 5 is a cross-sectional view showing a cross section of the casing in a temporarily assembled state before mounting the cover, and showing a correct mounting state of the element.

FIG. 6 is a cross-sectional view showing a cross section of the casing in a temporarily assembled state before mounting a cover and showing an improperly placed state of elements.

[Explanation of symbols]

 10 rotor (moving body) 11 brush 20 element 21 resistor 22 lead plate 30 casing 33 receiving portion 36 element terminal 40 cover 43 arm member

Claims (2)

[Scope of utility model registration request] 1. A position sensor for detecting a displacement of an object to be detected, the moving object being interlocked with the movement of the object to be detected, a casing accommodating the object, and arranged between the casing and the object. An element having a resistor on the side facing the moving body, a brush fixed on the side of the moving body facing the element and in sliding contact with the resistor, and a cover fitted to the casing, A position sensor, wherein an arm member for contacting the element to bring the element into contact with the casing in a fitted state with the casing is provided on the casing side of the. 2. The position sensor according to claim 1, wherein the arm member comes into contact with the vicinity of the lead plate of the resistor when the arm member is fitted in the casing.