KR100793247B1 - Method for fixing a detection ring of a torque sensor - Google Patents

Abstract

The present invention relates to a method of fixing a detection ring of a torque sensor for detecting torque acting on the shaft. The present invention comprises the steps of forming a first resin injection hole in the second detection ring, and at the same time forming a second resin injection hole in communication with the first resin injection hole in the first sleeve in which the second detection ring is pressed Forming an expansion groove communicating with the second resin injection hole on an inner surface of the first sleeve, and forming a resin filling groove communicating with the expansion groove on an outer circumferential surface of the drive shaft to which the first sleeve is rotatably coupled; And injecting the resin through the first resin injection hole of the second detection ring while assembling the first sleeve into which the second detection ring is press-fitted to the drive shaft and adjusting the position of the second detection ring. Filling resin into the injection hole, the expansion groove and the resin filling groove, and curing the resin filled in the first and second resin injection holes, the expansion groove and the resin filling groove, and fixing the second detection ring to the drive shaft. That scoop Gong. Therefore, it is possible to minimize the change in the assembly position generated in the assembly process of the second detection ring, and to easily assemble the second detection ring, it is possible to significantly reduce the assembly failure rate generated in the conventional manner, thereby improving productivity, In addition, since the performance of the assembled torque sensor is uniform, the reliability of the product is improved.

Description

Detection ring fixing method of torque sensor {METHOD FOR FIXING A DETECTION RING OF A TORQUE SENSOR}

1 is a partial cross-sectional view showing a detection ring assembly structure of a conventional torque sensor.

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

Figure 3 is a partial cutaway cross-sectional view showing a torque sensor assembled through the detection ring fixing method of the torque sensor in accordance with the present invention.

4 is a cross-sectional view taken along the line B-B in FIG.

<Description of the symbols for the main parts of the drawings>

22: drive shaft 23: driven shaft

24: torsion bar 25, 26, 27: 1, 2, 3 detection ring

28: 1st sleeve 41,42: 1st, 2nd resin injection hole

43: expansion groove 44: resin filling groove

45 resin

The present invention relates to a torque sensor for detecting a torque acting on the shaft, and is particularly provided at the end of the drive shaft and the driven shaft to form a magnetic circuit with a temperature compensation and magnetoresistance detection coil assembly installed inside the sensor housing. It relates to a fixing method of the second detection ring which is provided at the end of the drive shaft of the detection ring.

FIG. 1 is a cross-sectional view of a part of a conventional torque sensor, and includes three detection rings 5 at ends of a drive shaft 3 and a driven shaft 4 which are coaxially connected by a torsion bar 2 interposed therein. (6) (7) are provided at predetermined intervals in the axial direction, and teeth 5a, 6a and 7a are formed on the surfaces of the three detection rings 5, 6 and 7 which face each other. do.

The first detection ring 5 and the second detection ring 6 are installed on the drive shaft 3 with the first sleeve 8 interposed therebetween, and the third detection ring 7 is the second sleeve. (9) is installed on the driven shaft (4), the first, second and third detection rings (5), (6) and (7) are made of a magnetic material, and the first and second sleeves (8) ( 9) is made of nonmagnetic material.

On the outer circumferential surface of the first sleeve 8, a stopper protrusion 10 defining an assembly interval between the first detection ring 5 and the second detection ring 6 is formed in an annular shape, and the first sleeve 8 is formed in an annular shape. The pin 11 is formed to be movable in a state in which it is fitted to the drive shaft 3, that is, to rotate left and right, and as shown in FIG. 2, the pin 11 penetrating the second detection ring 6 and the first sleeve 8. It is fixed to the drive shaft 3 by it.

In the conventional torque sensor configured as described above, the first detection ring 5 and the second detection ring 6 are press-fitted from both sides of the first sleeve 8 to respectively press the first detection ring 5 and the second detection ring. Assembly intervals between the first detection ring 5 and the second detection ring 6 are constant by bringing the ends of the sixth ends into contact with both side surfaces of the stopper projection 10 formed on the outer circumferential surface of the first sleeve 8, respectively. Will remain.

Then, the second sleeve 9 and the third detection ring 7 are press-fitted to the end of the driven shaft 4, and then the first detection ring 5 and the second detection ring 6 are press-fitted and fixed. A second detection ring press-fitted to the first sleeve 8 by rotating the first sleeve 8 side to side with respect to the drive shaft 3 while the sleeve 8 is fitted at the end of the drive shaft 3 ( 6) teeth 6a of the third detection ring 7 and teeth 6a of the second detection ring 6, which are press-fitted to the end of the driven shaft 4 while moving the teeth 6a of 6) from side to side; The opposing angle (theta) between) is adjusted.

As described above, the opposite angle θ of the teeth 6a and 7a of the second detection ring 6 and the third detection ring 7 is adjusted by rotating the first sleeve 8 from side to side. In the state, the first sleeve 8 is fixed with a conventional clamp, and the pinhole 12 that reaches the second detection ring 6 and the first sleeve 8 and the drive shaft 3 with a drill and a reamer. After machining, the pin 11 is pressed into the pinhole 12 to fix the second detection ring 6 and the first sleeve 8 to the drive shaft 3.

However, the detection ring assembly structure of the conventional torque sensor configured as described above is in a state in which the opposing angles θ of the teeth 6a, 7a of the second detection ring 6 and the third detection ring 7 are adjusted. And fix the first sleeve 8 with a normal clamp, and drill the pinhole 12 to the second detection ring 6, the first sleeve 8 and the drive shaft 3 with a drill and a reamer. After that, the pin 11 is press-fitted into the pin hole 12 to fix the second detection ring 6 and the first sleeve 8 to the drive shaft 3, so that the second detection ring 6 The assembly work is cumbersome, the assembly takes a lot of time there was a problem that the productivity is lowered.                         

In addition, the adjustment position of the second detection ring 6 is changed during the drilling and reamer operation, thereby increasing not only the assembly failure rate, but also the performance of the assembled torque sensor is uneven and the reliability of the product is lowered. there was.

The present invention is to solve the conventional problems as described above, as well as to minimize the change in the assembly position caused in the assembling process of the second detection ring, it is possible to easily assemble the second detection ring of the torque sensor Its purpose is to provide a detection ring fixing method.

In order to achieve the object as described above, the present invention, the drive shaft and the driven shaft, the torsion bar interposed between the drive shaft and the driven shaft coaxially connecting the drive shaft and the driven shaft, and the end of the drive shaft A first coupled ring coupled to the driven shaft and a second sleeve coupled to the driven shaft, a first detection ring and a second detection ring installed far from the second sleeve, respectively, forcing the outside to the first sleeve; A second detection ring provided near the sleeve, and a third detection ring forcibly fitted to the outside of the second sleeve so as to be adjacent to the second detection ring, the magnetoresistance of each detection ring; A method of fixing a detection ring of a torque sensor for detecting a torque, the method comprising: forming a first resin injection hole in the second detection ring and communicating with the first resin injection hole in the first sleeve; Forming an injection hole corresponding to the second resin injection hole on the inner surface of the first sleeve and forming a resin filling groove corresponding to the expansion groove on the outer circumferential surface of the drive shaft; And press-fit the second detection ring to the first sleeve so that the first resin injection hole and the second resin injection hole communicate with each other, and engage the first sleeve and the drive shaft to engage the expansion groove. After adjusting the position of the first sleeve and the drive shaft to communicate with the resin filling groove, the resin is injected through the first resin injection hole to the second resin injection hole and the expansion groove and the resin filling groove And filling the resin, and curing the resin filled in the first and second resin injection holes, the expansion groove, and the resin filling groove such that the second detection ring is fixed to the drive shaft. The present invention provides a method of fixing a detection ring of a torque sensor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a partial cutaway cross-sectional view showing a torque sensor assembled through the detection ring fixing method of the torque sensor according to the present invention, Figure 4 is a cross-sectional view taken along line B-B of FIG.

As shown in FIG. 3, the torque sensor includes three detection rings 25, 26, 27 at ends of the drive shaft 22 and the driven shaft 23 which are coaxially connected by the torsion bar 24 interposed therein. ) Are provided at predetermined intervals in the axial direction, and teeth 25a, 26a, 27a are formed on the surfaces of the three detection rings 25, 26, 27 that face each other.

The first detection ring 25 and the second detection ring 26 are installed on the drive shaft 22 with the first sleeve 28 interposed therebetween, and the third detection ring 27 is the second sleeve. It is installed in the driven shaft 23 with the intervening (30), the detection rings 25, 26, 27 is made of a magnetic material, the first and second sleeves 28, 30 are made of a nonmagnetic material Is done.

On the outer circumferential surface of the first sleeve 28, a stopper protrusion 29 defining an assembly interval between the first detection ring 25 and the second detection ring 26 is formed in an annular shape, and the first sleeve 28 is formed in an annular shape. ) Is formed to be movable in the state fitted to the drive shaft 22, that is, rotatable from side to side.

According to a feature of the present invention, the second detection ring is fixed to the drive shaft by the following method.                     

First, the first resin injection hole 41 is formed in the second detection ring 26, and the first resin injection hole 41 is formed in the first sleeve 28 in which the second detection ring 26 is fitted. The second resin injection hole 42 in communication with the c) is formed and an expansion groove 43 in communication with the second resin injection hole 42 is formed in the inner surface of the first sleeve 28.

The resin filling groove 44 is formed on the outer circumferential surface of the drive shaft 22 to which the first sleeve 28 is rotatably coupled to the expansion groove 43 formed on the inner surface of the first sleeve 28.

Then, the first sleeve 28 in which the second detection ring 26 is fitted is assembled to the drive shaft 22, so that the first resin injection hole 41 and the second resin injection hole 42 communicate with each other. The second detection ring 26 is pressed against the first sleeve 28 to be tightly fitted. Next, the first sleeve 28 and the driving shaft 22 are coupled to the first sleeve 28 and the driving shaft 22 so that the expansion groove 43 and the resin filling groove 44 communicate with each other. ) Position.

In the state where the position of the second detection ring 26 is adjusted, the resin 45 is injected through the first resin injection hole 41 of the second detection ring 26, and the second resin injection hole 42 and After the resin is filled in the expansion groove 43 and the resin filling groove 44, the filled resin is cured to fix the second detection ring 26 to the drive shaft 22.

In the state where the position of the second detection ring 26 is adjusted, the first sleeve 28 is preferably fixed by a normal clamp and then resin is injected.

The width of the second resin injection hole 42 is greater than the width of the first resin injection hole 41, and the width of the resin filling groove 44 formed in the driving shaft 22 is the second resin injection. It is formed larger than the width of the expansion groove 43 in communication with the ball (42).

 As described above, according to the detection ring assembly structure of the torque sensor of the present invention, it is possible to minimize the assembly position change generated in the assembling process of the second detection ring, and to easily assemble the second detection ring. Therefore, it is possible to significantly reduce the assembly failure rate generated in the conventional manner, thereby improving productivity, and also providing the effect of improving the reliability of the product due to uniform performance of the assembled torque sensor.

Claims (2)

A drive shaft and a driven shaft, a torsion bar interposed between the drive shaft and the driven shaft to connect the drive shaft and the driven shaft coaxially, coupled to the first sleeve and the driven shaft coupled to an end of the drive shaft. A second detection ring and a first detection ring installed on the outer side of the first sleeve, the first detection ring installed far from the second sleeve, and the second detection ring installed near the second sleeve; And a third detection ring which is installed by being fitted to the outside of the second sleeve so as to be adjacent to the second detection ring, and fixed to the detection ring of the torque sensor for detecting torque by detecting magnetic resistance of each detection ring. In the method, Forming a first resin injection hole in the second detection ring; Forming an expansion groove corresponding to the second resin injection hole on an inner surface of the first sleeve while forming a second resin injection hole communicating with the first resin injection hole in the first sleeve; Forming a resin filling groove corresponding to the expansion groove on an outer circumferential surface of the drive shaft; The second detection ring is pressed against the first sleeve by force so that the first resin injection hole and the second resin injection hole communicate with each other, and the first groove and the driving shaft are coupled to each other so that the expansion groove and the After adjusting the position of the first sleeve and the drive shaft so that the resin filling grooves communicate with each other, resin is injected into the second resin injection hole, the expansion groove, and the resin filling groove by injecting resin through the first resin injection hole. Filling step, And hardening the resin filled in the first and second resin injection holes, the expansion groove, and the resin filling groove such that the second detection ring is fixed to the drive shaft. The method of claim 1, The width of the second resin injection hole is larger than the width of the first resin injection hole, the width of the resin filling groove is formed larger than the width of the expansion groove, the detection ring fixing method of the torque sensor.

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