JPH058408U - Direct-acting position sensor - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to eliminate wear of the rod tip of the direct-acting position sensor and the contact portion of the object to be detected. A bearing 22 or a roller is attached to the tip of the rod 3 of a direct-acting position sensor having a rod 3 that moves according to the movement of the object to be detected 17, so that the bearing 22 can rotate on the object 17 to be detected. Contact.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a direct-acting position sensor for detecting the movement amount and position of an object to be detected.

[0002]

[Prior art and its problems]

 2. Description of the Related Art Conventionally, a direct-acting position sensor has a structure shown in an external perspective view in FIG. 2 and a sectional configuration view in FIG. 3, and is used, for example, in a mode shown in FIG. That is, the position sensor 1 is provided with a rod 3 protruding from the case 2, a flange portion 4 having a bolt hole 5 is formed on the side surface of the case 2, and a bolt 6 is inserted into the bolt hole 5. Be attached to the device.

The rod 3 is movable in a direction in which it comes in and out of the case 2 via a bearing 7 in the case 2, and a brush holder 8 is attached to an inner end portion of the rod 3. The brush holder 8 is provided with a brush 9. A spring 10 is attached to the end of the brush holder 8 so that the rod 3 is always urged outward by the spring 10.

The brush 9 is in contact with a resistance substrate 11 arranged in the case 2, and a lead wire 12 is connected to the resistance substrate 11. When the brush 9 comes into contact with the resistance substrate 11 and moves on the resistance substrate 11 by the movement of the rod 3, the resistance value changes, the voltage signal output from the lead wire 12 changes, and the movement amount of the rod 3 changes. And the position is to be detected.

Such a position sensor 1 is fixedly mounted in a case 15 via bolts 6 in FIG. 4, and a fixed shaft 16 having a male screw 16a formed on the outer periphery is fixedly fixed in the case 15. A gear 17 is screwed onto the fixed shaft 16. The gear 17 is meshed with a gear 19 fixed to the motor shaft of the motor 18. The rod 3 of the position sensor 1 is in contact with the back surface of the gear 17, and when the gear 17 is moved by the rotation of the motor 18 on the fixed shaft 16, the rod 3 is moved along with this movement and the gear 17 moves. The movement amount and movement position can be detected by the position sensor 1.

In such a conventional structure, since the tip of the rod 3 comes into contact with the gear 17, which is the object to be detected, there is a problem in that the contact portion between the tip of the rod 3 and the gear 17 is abnormally worn. .

[0007]

[Means for Solving the Problems]

 The present invention was devised in view of the above conventional problems, and an object thereof is to provide a direct-acting position sensor capable of eliminating wear of a contact portion between a rod and an object to be detected. Attaches a brush to a rod that is displaced according to the movement of the object to be detected, brings the brush into contact with the resistance substrate, and changes the resistance value in response to the movement of the object to be detected, thereby adjusting the amount of movement. In the direct-acting position sensor that outputs a voltage signal, a bearing or roller that rotatably contacts the object to be detected is attached to the tip of the rod.

[0008]

[Action]

 Since a bearing or roller is attached to the rod end of the direct-acting position sensor, even if the bearing or roller comes into contact with the detected object and the detected object is accompanied by rotational movement, the bearing or roller rotates. As a result, it is possible to make a direct-acting position sensor with great durability without the contact part being worn.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a main part in a state where the direct acting position sensor is mounted in the apparatus shown in FIG. 4, and the direct acting position sensor 1 is fixed to a case 15 via bolts 6. A male screw is formed at the tip of the rod 3, the bearing holder 20 is screwed from the outside to the male screw, and the bearing holder 20 is fixed to the tip of the rod 3 by a screw locking agent. The bearing holder 20 has a protruding piece 20a protruding from the tip of the rod 3. A pin 21 is fitted into the protruding piece 20a from below, and the pin 21 is brazed to the bearing holder 20. It is fixed. The pin shaft 21a of the pin 21 projects upward, and a bearing 22 is fixed to the outer periphery of the pin shaft 21a via a retaining ring 23. Therefore, the outer circumference of the outer ring of the bearing 22 is in contact with the back surface of the gear 17, which is the object to be detected.

When the motor 18 in FIG. 4 is rotated, the gear 17 is rotated via the gear 19, and the gear 17 moves on the fixed shaft 16 with rotation. Since the rod 3 rotates with the rotation and the rod 3 can move with the movement of the gear 17, there is almost no frictional resistance on the contact surface between the gear 17 and the bearing 22, and the contact surface between the rod tip and the gear 17 is different from the conventional one. Does not wear out. A roller may be attached to the pin shaft 21a instead of the bearing 22.

[0011]

[Effect of the device]

 According to the present invention, a brush is attached to a rod that is displaced according to the movement of the object to be detected, the brush is brought into contact with the resistance substrate, and the resistance value is changed according to the movement of the object to be detected. In a direct-acting position sensor that outputs a voltage signal in accordance with the above, by attaching a bearing or roller that rotatably contacts the detected object to the tip of the rod, the detected object rotates. Even when moving, the bearing or roller can rotate to reduce the frictional resistance, and it has an effect that it can be used as a direct-acting position sensor in which wear does not occur on the rod tip and the contact surface of the object to be detected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part in a state where a direct-acting position sensor of the present invention is assembled to an object to be detected.

FIG. 2 is an external perspective view of a conventional direct-acting position sensor.

FIG. 3 is an internal structure diagram of a conventional direct-acting position sensor.

FIG. 4 is a schematic configuration diagram of an apparatus in which a direct-acting position sensor is assembled.

[Explanation of symbols]

 1 Direct acting type position sensor 2 Case 3 Rod 9 Brush 11 Resistance board 17 Gear (object to be detected) 20 Bearing holder 21 Pin 22 Bearing

Claims (1)

[Claims for utility model registration] [Claim 1] A brush is attached to a rod that is displaced according to the movement of an object to be detected, and the brush is brought into contact with a resistance substrate,
In a direct-acting position sensor that outputs a voltage signal according to the amount of movement by changing the resistance value in response to the movement of the detected object, the tip of the rod is rotatably contacted with the detected object. A direct-acting position sensor, which is equipped with a bearing or roller.