JPH0814068A - Air control valve device - Google Patents

Abstract

PURPOSE:To suppress the occurrence of displacement in a position of a coupling member even when the clearance of a bearing part is increased by a method wherein a coupling member on the throttle position sensor side is formed in an arcuate shape of a plate, a circular member is pressed in a hole formed in the direction of the diameter of a valve stem in a coupling member on the throttle valve stem side, and the two coupling members are brought into contact with each other. CONSTITUTION:A bearing member 17 pivotally supporting a throttle valve shaft 16 is worn owing to use for a long time and a clearance set at an initial stage is increased. In this case, when idling is applied, the negative pressure of an engine is exerted on a throttle valve body 18 and displacement in a position occurs by a clearance amount. A throttle position sensor 1 is rotated in synchronism with the rotary shaft of a sensor. In this case, a member 11 in a circular shape is pressed in a hole formed in the direction of diameter in the end of a throttle valve shaft 16, and the outer diameter part of the circular member 11 is brought into contact with a protrusion member 12 on the sensor side for coupling. Since the part, making contact with the circular member 11, of a protrusion member 12 on the sensor side is formed in an arcuate shape, even when a position making contact is displaced, a rotation amount of the throttle valve stem 16 is kept at a constantly specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air control valve device having a vehicle throttle valve opening detecting device for detecting an opening of a throttle valve for controlling an intake amount of an automobile engine.

[0002]

2. Description of the Related Art Conventionally, in this type of air control valve device, a throttle valve opening detection device for a vehicle and a throttle valve shaft are connected via a connecting member, and when the throttle valve shaft rotates, it is connected via a connecting member. The rotation shaft in the sensor rotates, and the switch means integrally connected to the rotation shaft detects the idling of the vehicle. There is also a sensor provided with a resistor for linearly detecting not only the idling state but also the rotation of the throttle valve shaft. JP 61-297742 discloses that for many years,
By using the air control valve device, wear occurs between the throttle valve shaft and the bearing member, and the clearance between the throttle valve shaft and the bearing member increases. The expansion of the clearance allows the throttle valve shaft to move within the bearing member. In view of these, in order to improve that the position of the throttle valve shaft is not accurately transmitted to the rotation shaft of the sensor, there is described that the influence of the clearance is avoided by the mounting angle of the connecting member.

[0003]

In the above-mentioned prior art, when used for a long period of time, the nut loosens due to the vibration of the engine, the initial position shifts, the clearance between the throttle valve shaft and the bearing member increases, and the cut surface of the plate material Since it is used for the connecting part, the position of the connecting part that is in contact with it moves and the initially set position shifts, so that the correct rotation of the throttle valve shaft is transmitted to the protruding member on the sensor side. There was a problem of not having. An object of the present invention is to provide an air control valve device in which displacement of the connecting member is unlikely to occur even if the clearance is increased due to wear of the bearing portion.

[0004]

According to the present invention, the connecting member on the throttle position sensor side is manufactured in a circular arc shape with a plate material, and the connecting member on the throttle valve shaft side is provided with a hole in the radial direction of the throttle valve shaft. A cylindrical or cylindrical member is press-fitted into this hole to bring both connecting members into contact with each other. Further, the cylindrical member is cut off in the longitudinal direction so that the cut surface has an axial shape and is press-fitted and held in the hole of the throttle valve shaft.

[0005]

Even if the engine expands and contracts due to heat change, the pressing force is kept constant by the cross section of the cylindrical or cylindrical member in the longitudinal direction to prevent the member from loosening. Also,
The connecting member on the throttle valve shaft side has a hole in the radial direction of the throttle valve shaft,
A cylindrical or cylindrical member is press-fitted and fixed in this hole, while the connecting member on the throttle sensor side bends the plate material in an arc shape and makes contact with the aforementioned cylindrical or cylindrical member at a right angle. The arcuate portion of the plate material should be long enough to sufficiently compensate the displacement even if the cylindrical or cylindrical member on the throttle valve shaft side is displaced during use.

[0006]

EXAMPLES Examples will be described below.

The bearing member 17 supporting the throttle valve shaft 16 shown in FIG. 1 wears after many years of use and becomes larger than the initially set clearance. If idling is performed when the clearance becomes large, the throttle valve main body 18 receives a negative pressure of the engine, whereby the throttle valve shaft 1
6 is displaced by the clearance amount of the bearing member 17. Throttle position sensor 1
Rotates in synchronization with the sensor rotation shaft 4 of FIG. At that time, a hole is provided in the diameter direction at the ends of the sensor-side protruding member 12 and the throttle valve shaft 16, and the circular member 11 is press-fitted into the hole.
Is contacted with and connected. Here, if the portion of the sensor-side protrusion member 12 that contacts the circular member 11 has an arcuate shape, the amount of rotation of the throttle valve shaft 16 is always kept constant even if the contact position shifts.

FIG. 2 shows a cross section of the throttle position sensor 1, and 2 is a resin sensor housing,
A rotary shaft 4 of the sensor is rotatably supported via a bearing 3. A rotor 5 is integrally fixed to the upper end of the rotary shaft 4, and the rotor 5 is provided with a brush 6 which serves as a switch means for issuing an idling detection signal. A ceramic substrate 7 is arranged so as to face the rotor 5, and a conductive piece (not shown) that is in sliding contact with the electric brush 6 and emits an electric signal is provided on the substrate 7. A sensor side protrusion member 12 is fixed to the other end of the rotating shaft 4. A portion where the connecting portion 12a of the sensor-side protruding member and the circular member 11 of the throttle valve shaft contact each other is installed in an arc shape as shown in the figure, and the convex side surface of this arc shape always makes contact. I am doing it. A coil spring 13 is arranged between the sensor housing 2 and the sensor-side protruding member 12, and the sensor-side protruding member 12 is rotated by the rotation of the throttle valve shaft, and the coil spring 13 is also wound and tightened. When the valve shaft returns to its original position, it is returned to its original position by the elastic force of the coil spring 13. This time, it was explained with a switch, but instead of the switch, it may be configured as a variable resistor by a combination of a brush and a resistor.

FIG. 3 is a view showing another shape of the member press-fitted in the diametrical direction of the throttle valve shaft. (A) is a hollow cylindrical pipe. Further, (b) and (c) are cylindrical pipes provided with grooves in the longitudinal direction. The hollow cylindrical pipe (a) has a small material thickness even if it is affected by the heat change of the engine, so the amount of heat change is small and a sufficient pressure input with the hole of the throttle valve shaft can be secured. Further, the cylindrical pipes (b) and (c) provided with a cut groove in the longitudinal direction absorb the amount of heat change in this groove, so that a pressure input can be secured from the cylindrical pipe.

The connecting portion between the throttle valve shaft side protruding member 20 and the sensor side protruding member 12 shown in FIG. 4 is provided with a protruding portion 20a on the throttle valve shaft side protruding member 20 and holds the contact position of the connecting portion at one point. I do it when I do. However, when the clearance increases, the position of the sensor-side protruding member 12 does not change, but the position of the protruding portion 20a of the throttle valve shaft-side protruding member 20 deviates from the initially set position of the sensor-side protruding member 12. Besides, although the throttle valve shaft projection member 20 is tightened with the nut 19, the function can be sufficiently satisfied only by press-fitting into the throttle valve shaft 16 as in the present invention, and the number of parts is reduced.
In particular, it is not necessary to manage the important nut tightening torque, and a great reduction in man-hours can be obtained. 1, 17 and 18 are the same as those in FIG.
It is the throttle valve body.

FIG. 5 is a view of the above-mentioned connecting portion shown in FIG. 4 viewed from the P direction.

FIG. 5A shows the protrusion 2 in the initial setting state.
0a and the position of the sensor-side protruding member 12 are shown, and (b) shows a case where the clearance of the bearing portion 17 in FIG. 4 is enlarged due to wear during long-term use. Further, (c) and (d) show the contact state of the connecting portion when the connecting portion of (a) and (b) is cross-sectioned along VV and SS. (B) shows a view in which the contact point of the connecting portion has moved due to wear of the bearing 17 in FIG. 4 during long-term use. Further, when seen in (d), the sensor-side protruding member 12 bends the plate material, The end face is used. When pressing a plate material, the cross section is not a uniform fracture surface, generally 2/3 of the plate thickness is flat at the cut surface, and the remaining 1/3 is a fracture surface, and the plate material in this part was stripped off. The shape is always concave from the flat part and is non-uniform. As a result, the sensor or switch detection signal changes significantly. However, according to the present invention, during long-term use,
The clearance of the bearing will not be expanded due to wear.

In FIG. 6, it is conceivable that the contact portion will be worn out after long-term use. At this time, by quenching both or one side of the contact member, the effect of reducing the change in the wear amount of the solid line to the change of the wear amount of the dotted line can be obtained. In order to prevent the amount of wear from increasing due to rust on the contact surface, it is effective if the cylindrical member 11 press-fitted into the throttle valve shaft 16 in FIG. 1 is made of stainless steel.

[0014]

In view of this phenomenon, the present invention makes it difficult for the connecting member to be displaced even if the clearance is enlarged due to wear of the bearing portion. Further, with this structure, it is not necessary to tighten the projection member of the throttle valve shaft with the nut and to control the tightening torque, and the nut is not necessary, so that the size can be reduced by the length of the nut. This is an effective means for downsizing in the present situation where the engine space is narrow and severe.

[Brief description of drawings]

FIG. 1 is a structural cross-sectional view showing the present invention.

FIG. 2 is a sectional view of a throttle position sensor attached to FIG.

FIG. 3 shows another current state of the member to be press-fitted into the throttle valve shaft of the present invention.

FIG. 4 is a structural cross-sectional view showing a conventional example.

FIG. 5 is a diagram showing the contact portion positions of the initial and long-term use sites in FIG.

FIG. 6 is a graph showing the effect of quenching the contact member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Throttle position sensor, 2 ... Sensor housing, 4 ... Rotating shaft, 11 ... Circular member, 12 ... Sensor side protrusion member, 12a ... Sensor side protrusion member connection part,
16 ... Throttle valve shaft, 17 ... Bearing, 18 ... Throttle valve, 19 ... Nut, 20 ... Throttle valve shaft projection member, 20a ... Projection portion.

Claims (5)

[Claims] 1. A throttle valve shaft, a throttle valve attached to the throttle valve shaft for adjusting an intake air amount of an engine, a bearing member axially supporting the throttle valve shaft, and the bearing member and the throttle valve shaft. In a pneumatic control valve device including a throttle position sensor connected to detect the rotation angle of the throttle valve shaft according to the rotation, a cross section fixed to one end of the throttle valve shaft and protruding in the radial direction of the throttle valve shaft. It is composed of a circular protrusion member and a connecting member that is fixed to the sensor rotation shaft of the throttle position sensor and has an arcuate cross section that protrudes in the axial direction of the sensor rotation shaft. An air control valve device, which is in contact with a convex outer peripheral surface. 2. The air control valve device according to claim 1, wherein an axial direction of the projection member and an axial direction of the arc shape of the connecting member are substantially perpendicular to each other. 3. The air control valve device according to claim 1, wherein at least one of the protruding member and the connecting member is quenched. 4. The air control valve device according to claim 1, wherein the projecting member has a cylindrical cross-sectional shape, and is manufactured by rolling a flat plate into a cylindrical shape. 5. The air control valve device according to claim 1, wherein at least one of the protruding member and the connecting member is made of a corrosion resistant material.