Sensor cable drawing structure

Abstract

To deal with the issue that it is difficult to reduce the cost of drawing a cable from a housing since the drawing uses a cable ground.SOLUTION: A sensor cable drawing structure includes: a storage recessed part 10 provided in a housing 2 for providing a sensor body 1A and a cable 5; and a housing for covering an opening unit 10A of the storage recessed part 10. The cable 5 is connected to the sensor body 1A and is drawn to the outside through a cable drawing port 6 formed in a housing 2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a cable pull-out structure for a sensor, and in particular to a new and improved method for easily pulling out a cable to the outside by using a cable pull-out port integrated with a housing, without using a cable gland, a screw structure, or the like. [Background technology]

[0002] Examples of cable pull-out structures for this type of sensor that have been used in the past include the structure of the connector part of a photoelectric sensor disclosed in Patent Document 1 shown in FIG. 5, and the structure developed by the present applicant shown in FIGS. 6 and 7. First, in the case of the first conventional structure shown in Fig. 5, the sensor side connector 4 is provided on the photoelectric sensor 1 so as to be able to swing via the inclined surface 3. The cable side connector 6 at the end of the cable 5 is detachably connected to the sensor side connector 4. The inside of the sensor side connector 4 is sealed with a waterproof packing. This allows for easy assembly with a minimum number of parts without compromising the waterproof structure of the sensor side connector 4.

[0003] In the case of the second conventional structure developed in-house and shown in Figures 6 and 7, a mounting member 7 is attached to the housing 2 via a screw 2E, and the cable 5 is pulled outward through a cable gland 6 provided on this mounting member 7. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-163131 Summary of the Invention [Problem to be solved by the invention]

[0005] The conventional cable lead-out structure of the sensor is configured as described above, and therefore has the following problems. That is, in the first conventional configuration of FIG. 5, a 90-degree swivel type cable side connector portion 6 is provided at a corner 8 of the housing 2, and the direction in which the cable 5 is pulled out can be changed by 90 degrees, which makes the cost of the connector portion relatively high.

[0006] In the second conventional configuration shown in Figs. 6 and 7, a cable gland 6 for drawing out a cable 5 is provided on the outlet side 3 of the housing 2. Therefore, although the cable gland 6 has high performance, it is expensive, and when used in large quantities, further cost reduction is required.

[0007] The present invention has been made to solve the above-mentioned problems, and in particular to provide a cable pull-out structure for a sensor that enables the cable to be easily pulled out to the outside by using a cable pull-out port integrated with the housing, without using a cable gland, screw structure, etc. [Means for solving the problem]

[0008] The cable pull-out structure for a sensor according to the present invention is provided in a housing, and includes a storage recess for accommodating a sensor body and a cable, and a lid for covering the opening of the storage recess, wherein the cable connected to the sensor body is pulled out to the outside through a cable pull-out port formed in the housing, a ring-shaped recess is formed at the base of the cable pull-out port, and one end of a heat-shrinkable tube provided at the cable pull-out port is engaged with the ring-shaped recess, a cable holder for fixing the cable is provided within the storage recess, the sensor body is a non-powered sensor used on railways, and the sensor body is configured to measure the speed of railway wheels. Effect of the Invention

[0009] Since the cable lead-out structure of the sensor according to the present invention is configured as described above, it is possible to obtain the following effects. That is, in a cable pull-out structure for a sensor which has a storage recess provided within a housing for accommodating a sensor body and a cable, and a lid for covering the opening of the storage recess, the cable connected to the sensor body passes through a cable pull-out port formed in the housing and is pulled out to the outside, and since the cable pull-out port is provided in the housing, the structure is integrated, thereby achieving significant cost reduction. In addition, a ring-shaped recess is formed at the base of the cable outlet, and one end of the heat-shrinkable tube provided at the cable outlet engages with the ring-shaped recess, thereby engaging the cable and the cable outlet as a single unit, and the cable and the cable outlet are joined together by the heat-shrinkable tube provided at the cable outlet, and the end of the heat-shrinkable tube engages with the ring-shaped recess and shrinks, resulting in a cable outlet structure with excellent connection and waterproofing. Furthermore, a cable holder for fixing the cable is provided within the accommodating recess, so that the cable can be securely fixed within the accommodating recess of the housing. Furthermore, since the sensor body is a non-powered sensor used in railways, a strong sensor with a cable pull-out structure can be attached, thereby ensuring stable operation of the railway. Furthermore, the sensor body can perform highly accurate speed control by measuring the speed of the wheels of the railway. [Brief description of the drawings]

[0010] [Figure 1] 1 is a front view showing a cable lead-out structure for a sensor according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a right side view of FIG. [Diagram 3] FIG. 2 is a front view showing the inside of FIG. [Figure 4] FIG. 4 is a right side view of FIG. [Diagram 5] FIG. 1 is an exploded plan view of a first conventional configuration. [Figure 6] FIG. 11 is a front view of a second conventional configuration. [Figure 7] FIG. 7 is a right side view of FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The cable pull-out structure of the sensor according to the present invention allows the cable to be easily pulled out to the outside by using a cable pull-out port integrated with the housing, without using a cable gland, a screw structure, or the like. EXAMPLES

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a cable pull-out structure for a sensor according to the present invention will be described with reference to the drawings. In addition, parts that are the same as or equivalent to those in the conventional example are denoted by the same reference numerals. In FIG. 1, the symbol 1 denotes a sensor consisting of a well-known battery-less sensor for measuring, for example, the wheel speed of a train or the like, and its housing 2 is formed from a material such as aluminum (which is easy to shape, has excellent temperature resistance properties as it does not retain temperature, is light and has good magnetic resistance). The housing 2 is formed by aluminum casting or aluminum cutting, and a space serving as an accommodating recess 10 is formed inside the housing 2. The cable 5 and the like shown in Figures 3 and 4 are installed inside the accommodating recess 10.

[0013] Within the receiving recess 10 of the housing 2, a first sensor section 12 and a second sensor section 13 each consisting of a pair of cores are partially exposed and configured as a sensor body 1A capable of outputting a two-phase detection output. The lead wires 16 are connected to the cable 5 via a binding string 17 , and the cable 5 is firmly held in the receiving recess 10 by a cable retainer 18 via a fixing screw 19 . The cable 5 to which the bundled lead wires 16 are connected passes through the cable retainer 18 and penetrates the cable outlet 6 to be drawn out to the outside.

[0014] The cable outlet 6 is molded or formed integrally with the housing 2, and a ring-shaped recess 20 made of a groove is formed on the outer periphery 6a of the base 6A. The outer surface of the cable outlet 6 is covered with a heat shrink tube 21 , and this heat shrink tube 21 shrinks and deforms when heated so as to cover a part of the cable 5 , the cable outlet 6 and the ring-shaped recess 20 . One end 21a of the heat shrink tube 21 is located in the annular recess 20, and the other end 21b of the heat shrink tube 21 is located in a portion 30 where the cable outlet 6 and the cable 5 overlap. This makes it possible to completely prevent moisture from entering the accommodating recess 10 in the housing 2 from the outside via the cable outlet 6. Therefore, a cable outlet structure with excellent connection and waterproofing can be obtained, that is, a highly reliable waterproof sensor can be obtained.

[0015] The cable 5 in the accommodating recess 10 is connected to a lead wire 16 by a crimp terminal 23 having a crimp terminal insulating tube 22, and a sensor body 1A consisting of the first and second sensor units 12, 13 connected to the lead wire 16 is installed on the bottom 26 of the housing 2. The angular positions of the first and second sensor units 12, 13 are adjusted by fixing screws 26a, respectively. After the cable 5 and the lead wire 16 are accommodated in the accommodating recess 10, a filler 25 such as epoxy is filled into the accommodating recess 10, thereby determining the positions of the lead wire 16, cable 5, crimp terminal 23 and parts of each sensor 12, 13 within the accommodating recess 10.

[0016] In the above-mentioned state, the opening 10A of the accommodation recess 10 of the housing 2 is covered with a lid 2A, whereby the sensor 1 is completed. As described above, the completed sensor 1 is attached, for example, to a position near a gear (not shown) of a railway wheel using the mounting member 7 and mounting hole 7a, and as the gear rotates, first and second phase rotational analog signals are obtained from the first and second sensors 12, 13. Each of the analog signals is converted into a digital signal by an A / D converter (not shown) and used for driving control by other processing circuits. [Industrial Applicability]

[0017] The cable outlet structure of the sensor according to the present invention uses a housing made by integral molding or cutting from resin or aluminum, and the cables connected to parts of the first and second sensor parts and lead wires housed in the housing recess are easily drawn to the outside through a cable outlet port that is integral with the housing, thereby achieving cost reduction. In addition, this cable outlet port is sealed with a heat shrink tube, which reliably prevents moisture from entering the sensor from the outside, and a highly reliable waterproof sensor can be obtained with a cable outlet structure that has excellent connection and waterproofing properties. [Explanation of symbols]

[0018] 1 Sensor 1A Sensor body 2. Chassis 2A Lid body 5 Cable 6 Cable outlet 6A base 6a Base outer circumference 7 Mounting material 7A Mounting hole 10. Recess 10A opening 12 First Sensor 13 Second Sensor 16 Lead Wire 17 Binding Cord 18 Cable holder 19 Fixing screw 20 Annular recess 21 Heat shrink tubing 21a one end 21b Other end 22 Crimp terminal insulating tube 23 Crimp terminal 25 Fillers 26 Bottom 26a Fixing screw 30 portions

Claims

1. A cable lead-out structure for a sensor, comprising: a housing (2) provided with a receiving recess (10) for receiving a sensor body (1A) and a cable (5); and a cover (2A) for covering an opening (10A) of the receiving recess (10), The cable (5) connected to the sensor body (1A) is pulled out to the outside through a cable outlet (6) formed in the housing (2).

2. 2. The cable outlet structure for a sensor according to claim 1, wherein a ring-shaped recess (20) is formed in a base (6A) of the cable outlet (6), and one end (21a) of a heat-shrinkable tube (21) provided in the cable outlet (6) is engaged with the ring-shaped recess (20).

3. 2. The sensor cable pull-out structure according to claim 1, wherein a cable holder (18) for fixing the cable (5) is provided in the receiving recess (10).

4. 2. The cable lead-out structure for a sensor according to claim 1, wherein the sensor body (1A) is a non-powered sensor used in railways.

5. 5. The cable lead-out structure for a sensor according to claim 1, wherein the sensor body (1A) measures the speed of a railway wheel.

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