JP3650468B2 - Bearing with throttle valve opening sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing with a throttle valve opening sensor in which a sensor element portion for detecting the opening of a throttle valve of an internal combustion engine and a bearing for supporting a throttle shaft are incorporated in a common housing.
[0002]
[Prior art]
As shown in FIG. 5, the throttle valve device generally has a structure in which a throttle shaft 52 integral with the throttle valve 51 is supported by bearings 54, 54 provided on both sides of the throttle body 53, and is attached to one end of the throttle shaft 52. The return spring 55 is connected to the throttle valve opening sensor 56 at the other end. The return spring 55 interlocks an axle pedal (not shown) and the throttle valve 51.
The throttle valve opening sensor 56 rotatably supports a rotor 58 in a housing 57 attached to the throttle body 53, and the brush 60 of a potentiometer 61 including a substrate 59 with a resistor and a brush 60 is attached to the rotor 58. It is a thing. The shaft portion of the rotor 58 is connected to the throttle shaft 52 by a meshing portion 62 including a groove portion and a protruding piece so that the rotation of the throttle shaft 52 can be transmitted. In addition, in order to prevent a decrease in detection accuracy due to play of the meshing portion 62, a return torsion coil spring 63 that rotationally biases the rotor 58 is provided, and the protruding piece of the meshing portion 62 is always pressed against the groove inner surface in a predetermined rotational direction. It is like that. The return torsion coil spring 63 is attached to a sleeve 64 that is press-fitted into the outer periphery of the rotor 58.
[0003]
[Problems to be solved by the invention]
However, in the throttle body 53, the mounting portion 53a of the bearing 54 protrudes outward, and the housing 57 of the throttle valve opening sensor 56 is mounted on the outside thereof, so that the entire throttle valve device becomes longer in the axial direction of the throttle shaft 52. End up. Even if it is intended to be compact, there is a limit because it is necessary to rotatably support the rotor 58 on the housing 57. Further, when assembling, the work of assembling the bearing 54 into the throttle body 53 and the work of attaching the opening sensor 56 to the throttle body 53 while connecting the rotor 58 to the throttle shaft 52 are required, which takes time.
Further, since the rotor 58 of the sensor 56 is connected to the throttle shaft 52 by the meshing portion 62, an error occurs in the axial centers of the rotor 58 and the throttle shaft 52, which affects the detection accuracy of the opening degree of the throttle valve 51. The clearance in the rotational direction generated in the meshing portion 62 is dealt with by providing a return torsion coil spring 63, but in order to obtain the arrangement space, it is further increased in the axial direction.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing with a throttle valve opening sensor that can solve the above-described problems, can be made compact in the throttle valve device, has good assembly workability, and can improve detection accuracy. To do.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a bearing with a throttle valve opening sensor according to the present invention is provided with a shaft support bearing for supporting the throttle shaft with a rotor on which a rotation side component of a sensor element portion for detecting a rotation angle of the throttle shaft is mounted. It is attached to the inner ring. The shaft support bearing is a rolling bearing.
With this configuration, the rotation side component of the sensor element portion and the shaft center of the shaft support bearing are surely aligned, and the rotor can be easily attached.
The rotor has a cylindrical shape with a flange, and is attached to the inner ring in a press-fitted state at the cylindrical portion, and the rotation side component of the sensor element portion is attached to the flange portion . The throttle shaft is press-fitted into the cylindrical portion of the rotor .
Further, the rolling bearing may have a width dimension that fits within an axial width of the rotor.
Further, a shaft support bearing for supporting the throttle shaft and a sensor element portion for detecting the rotation angle of the throttle shaft may be provided in the housing.
This sensor-equipped bearing is attached to the throttle body and used for supporting the throttle shaft and detecting the opening of the throttle valve. As described above, since the bearing supporting the throttle shaft and the sensor element portion are housed in a common housing to form a unit, it is not necessary to provide a shaft support bearing on the sensor side in the throttle body, and one shaft support bearing is used. The support of the throttle shaft and the support of the rotor of the sensor element portion can be used together. Therefore, the overall configuration is compact in the axial direction of the throttle shaft. Further, since the shaft support bearing is incorporated in the housing in advance, it is not necessary to incorporate the bearing in the throttle body, and the assembly workability to the throttle body is good. In addition, since the shaft support bearing and the sensor element portion are provided in the common housing, the shaft centers of the shaft support bearing and the sensor element portion coincide with each other, and the detection accuracy is high.
[0006]
In the above configuration, the sensor element portion is preferably disposed between the end wall portion having the throttle shaft insertion port of the housing and the shaft support bearing. It is preferable that the sensor element part is hermetically sealed as a whole, but in this case, the sensor element part is located between the shaft support bearing and the throttle body, and therefore only the throttle body side of the sensor element part is disposed. What is necessary is just to seal and it is easy to seal. Further, it is not necessary to provide a sealing wall on the bearing side, so that further compactness and easy assembly can be achieved.
In this case, a seal that seals between the throttle shaft and the throttle shaft may be provided in the throttle shaft insertion port, thereby ensuring sealing performance.
Further, in the above configuration, when the housing is made of a synthetic resin, a collar that fits the outer ring of the shaft support bearing is provided, and when the housing is molded with the resin, the collar and the housing may be integrated by insert molding or the like. good. By providing the collar in this manner, the lack of rigidity of the bearing fitting portion of the housing made of synthetic resin can be compensated. Further, in order to integrate a resin molding, that Do mounting of the collar is ensured.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. This bearing 1 with a throttle valve opening sensor detects a rotation angle of the throttle shaft 5 and a shaft support bearing 6 that supports the throttle shaft 5 of the throttle valve 4 in a resin housing 3 attached to the throttle body 2. A sensor element unit 7 is provided. The shaft support bearing 6 is a standard type rolling bearing such as a deep groove ball bearing with a seal, and the sensor element portion 7 is a potentiometer or the like. The shaft support bearing 6 may be a sliding bearing.
[0008]
The shaft support bearing 6 is attached to a cylindrical collar 8 embedded in the inner diameter surface of the bearing fitting wall 3b of the housing 3 in a press-fit state with an outer ring 6a, and a cylindrical rotor 9 with a flange on the inner ring 6b. Is attached in a press-fit state at the cylindrical portion. The flange portion of the rotor 9 is disposed inside the housing of the shaft support bearing 6. The rotor 9 is made of a resin such as saturated polyester or polyphenylene sulfide resin, and the throttle shaft 5 is press-fitted into the rotor 9 and supported by the shaft support bearing 6. Here, a metal sleeve may be interposed between the throttle shaft 5 and the rotor 9 to suppress wear of the rotor 9. The collar 8 is made of a metal such as a steel material or a sintered alloy, and is integrated with the housing 3 by insert molding.
[0009]
The housing 3 has a cylindrical bearing fitting wall 3b projecting concentrically from a substantially circular end wall 3a adjacent to the throttle body 2, and a connector insertion portion from the base end of the bearing fitting wall 3b. 3c protrudes to the outer diameter side. The connector insertion part 3c has the connector terminal 10 inside, and is provided with a connector locking claw 3d. A connector (not shown) for taking out the output of the sensor element portion 7 is detachably attached to the connector insertion portion 3c. A mounting ear portion 3e (FIG. 1 (B)) protrudes from the connector insertion portion 3c of the end wall portion 3a at both sides from the connector insertion portion 3c, and is attached to the ear portion 3e in the circumferential direction. A hole 11 is provided. An annular reinforcing member 12 made of a sintered alloy or the like is provided on the periphery of the mounting hole 11 and is integrated with the housing 3 together with the collar 8 by insert molding. A throttle shaft insertion port 13 is formed in the center of the end wall portion 3a of the housing 3, and a seal 14 for sealing between the throttle shaft 5 and the inner diameter surface thereof is attached. The seal 14 is made of an elastic body such as rubber. In addition, an annular positioning recess 3f that fits into an annular protrusion 2a provided on the throttle body 2 is formed on the outer peripheral edge of the outer surface of the end wall 3a.
[0010]
The potentiometer serving as the sensor element portion 7 includes a substrate 15 provided on the inner surface of the end wall portion 3 a of the housing 3 and a brush 16 provided on the flange portion of the rotor 9. The sensor element unit 7 is configured to change the voltage value by conducting electrical conduction between a plurality of resistors formed in a concentric ring shape or arc shape on the substrate 15 or between the resistors and electrodes by sliding contact of the brush 16. The rotation angle of the rotor 9 is detected. Resistors and electrodes of the substrate 15 are connected to the connector terminal 10. The sensor element unit 7 is not limited to a potentiometer, and may be one that detects a rotation angle magnetically or optically. For example, a rotation angle detection composed of a magnetic scale and a magnetic sensor, or a dentition and a magnetic sensor. Can be used.
[0011]
The usage pattern and operation of the throttle valve opening sensor-equipped bearing 1 will be described. FIG. 2 shows a state where the bearing 1 with the throttle valve opening sensor is attached to the throttle body 2. The throttle body 2 is provided with a built-in bearing 17 that supports the throttle shaft 5 only on one side, and the other end side of the throttle shaft 5 is supported by the shaft support bearing 6 of the bearing 1 with the opening sensor. . A portion of the throttle shaft 5 protruding from the built-in bearing 17 is provided with a return spring 18 for interlocking with the axle pedal. In addition, you may comprise the bearing 17 by the side of the said return spring 18 with the said bearing 1 with an opening degree sensor.
The operation of attaching the bearing 1 with the opening sensor to the throttle body 2 is performed by press-fitting the throttle shaft 5 into the rotor 9 from the throttle shaft insertion port 13 of the housing 3 of the bearing 1 with the opening sensor. This is done by bolting the ear 3e to the side of the body 2. A mounting bolt (not shown) of the ear 3e is inserted into the mounting hole 11 and screwed into a screw hole (not shown) of the throttle body 2. The mounting hole 11 is a long hole as described above. With this, the mounting angle can be finely adjusted.
[0012]
According to the throttle valve opening sensor-equipped bearing 1 having this configuration, the support bearing 6 of the throttle shaft 5 and the sensor element portion 7 are thus housed in the common housing 3 to form a unit, and the throttle valve 4 and the sensor element portion 7 are also united. Since the shaft support bearings 6 are arranged so as to be arranged in this order, it is compact in the axial direction. Further, since the shaft support bearing 6 is incorporated in the housing 3 in advance, the assembly workability to the throttle body 2 is good. In addition, the shaft support bearing 6 and the sensor element portion 7 are aligned with each other, and the detection accuracy is improved. In particular, since the rotor 9 is press-fitted between the inner ring 6b of the shaft support bearing 6 and the throttle shaft 5, the shaft centers of the shaft support bearing 6 and the sensor element portion 7 are more reliably matched, and the detection accuracy is further improved. Further, the size is further reduced in the axial direction.
[0013]
FIG. 3 shows a second embodiment of the present invention. In this embodiment, instead of the collar 8 in the embodiment of FIG. 1, a cylindrical collar 8A in which the ear 8a shown in FIG. 4 protrudes on both sides is used. The ear 8a is formed with a mounting hole 11A made of an arc-shaped long hole, and the ear 3e of the housing 1 in the example of FIG. 1 is eliminated. Further, the collar 8A has a width that covers substantially the entire axial width of the cylindrical portion 3b of the housing 3, and resin inflow notches 19 and 20 are provided at positions 90 ° away from the ear portion 8a in the circumferential direction. is there. The collar 8A is integrated with the housing 3 by insert molding in the same manner as in the above embodiment, but the resin of the housing 3 flows into the resin inflow notches 19 and 20 so that the housing 3 and the collar 8 are integrated. In addition to being sure, the housing 3 continues integrally without being interrupted by the insertion of the collar 8.
In such a configuration, the collar 8A into which the shaft support bearing 6 is press-fitted can be directly fixed to the throttle body 2 by the ear portion 8a, so that the shaft support bearing 6 is fixed to the throttle body 2 with certainty. Other configurations and effects are the same as those of the embodiment of FIG.
[0014]
In each of the above embodiments, the rotor 9 is interposed between the shaft support bearing 6 and the throttle shaft 5. However, the shaft support bearing 6 is directly fitted to the throttle shaft 5, and the rotor 9 is connected to the shaft support bearing 6. You may attach to the throttle shaft 5 between the end wall parts 3a of the housing 3. FIG.
[0015]
【The invention's effect】
Throttle valve opening bearing with sensor of the present invention, cell a rotor rotating side parts are attached in the capacitors element portion, since the mounted in the fitting state to the inner ring of the shaft support bearing, detection accuracy that by the coincidence of the axis Improvement can be expected.
[Brief description of the drawings]
FIG. 1A is a sectional view of a bearing with a throttle valve opening sensor according to an embodiment of the present invention, and FIG. 1B is a front view of the housing.
FIG. 2 is a cross-sectional view showing a state in which a bearing with the same opening sensor is attached to a throttle body.
3A is a cross-sectional view of a bearing with a throttle valve opening sensor according to a second embodiment of the present invention, and FIG. 3B is a front view of the housing.
4A to 4C are a plan view, a cross-sectional view, and a front view, respectively, of a collar according to the embodiment.
FIG. 5 is a cross-sectional view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Bearing with opening sensor 2 ... Throttle body 3 ... Housing 4 ... Throttle valve 5 ... Throttle shaft 6 ... Shaft support bearing 7 ... Sensor element part 8, 8A ... Collar 9 ... Rotor 13 ... Throttle shaft insertion port 14 ... Seal 15 ... Substrate 16 ... Brush

Claims (4)

A rotor rotating side parts are attached in the sensor element which detects the rotation angle of the throttle shaft, said mounting only the fitted state the inner ring of the shaft support bearing consisting of a rolling bearing for supporting the throttle shaft, said rotor flanged The cylindrical part is attached to the inner ring in a press-fitted state at the cylindrical part, and the rotation side part of the sensor element part is attached to the flange part, and the throttle shaft is the cylindrical part of the rotor slot Rubarubu opening bearing with a sensor that is press-fitted into. Oite to claim 1, wherein the rolling bearing, the throttle valve opening bearing with sensor is of a width to fit in the axial direction within the width of the rotor. A shaft support bearing for supporting a throttle shaft and a sensor element portion for detecting a rotation angle of the throttle shaft are provided in a housing that can be mounted on the throttle body, and an end wall portion having a throttle shaft insertion port of the housing and the shaft The bearing with a throttle valve opening sensor according to claim 1 or 2 , wherein the sensor element portion is arranged between the support bearing and the support bearing. 4. A bearing with a throttle valve opening sensor according to claim 3, wherein the housing is made of resin, and a collar on which an outer ring of the shaft support bearing is fitted is provided on an inner surface thereof, and the collar is integrated with the housing by resin molding of the housing. .

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