JPH0781545B2 - Idling speed control valve for internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idling speed control valve between internal combustion engines that controls a flow rate of a bypass passage provided in an intake passage of an internal combustion engine.

[Conventional technology]

Conventionally, as an idling speed control valve of this type, for example, there is one disclosed in Japanese Patent Publication No. 61-57935. FIG. 5 is a view showing such an idling speed control valve, in which 1 is a step motor, 2 is a motor housing for holding the step motor 1, 3 is a motor housing end plate, 4 is a valve housing, These housings 2,4
The end plates 3 are fastened to each other by bolts 5. A flange 5 is integrally formed on the valve housing 4, and a valve chamber 6 is formed in the valve housing 4. The valve chamber 6 has an intake air outlet 6a on its vertical side wall surface and a horizontal lower wall surface. The intake air inlets 6b are formed so as to communicate with the bypass passages. Reference numeral 7 is a bypass pipe forming a bypass passage. A valve seat 8 is fitted in the outlet 6a.

On the other hand, the step motor 1 includes a rotor 10 arranged coaxially with the valve shaft 9, and a pair of stators 11 and 12 fixedly arranged with a minute gap from the cylindrical outer peripheral surface of the rotor 10. The valve shaft 9 is horizontally arranged so that the vibration of the engine is not applied in the axial direction of the valve shaft 9, and is extended and installed in the central portion of the valve chamber 6. The end of the valve shaft 9 is supported by a bearing 13 fixed to the motor housing 2, and the intermediate part is supported by a bearing 14 fixed to the housing end plate 3. Further, the valve shaft 9 has a first stop pin 15 that contacts the rotor 10 when the valve shaft 9 is in the maximum forward position, and a second stop pin 15 that contacts the rotor 10 when the valve shaft 9 is in the maximum retracted position. Pin 16
Is stuck. Further, an outer screw thread 17 is screwed on the outer peripheral surface of the valve shaft 9, and a flat portion 18 extending from the vicinity of the end position of the outer screw thread 17 toward the outflow port 6a is formed.
The valve shaft 9 is supported so as to be non-rotatable and axially slidable by the engagement of the bearing 14 with the bearing 14. A valve body 20 having a substantially conical outer peripheral surface 19 is fixed to the tip end of the valve shaft 9 by a nut 21, and an annular outlet is formed between the outer peripheral surface 19 of the valve body 20 and the valve seat 8. . Further, a compression spring 22 is arranged in the valve chamber 6 between the valve body 20 and the housing end plate 3.

The rotor 10 includes a cylinder 23, an intermediate cylinder 24 fitted and fixed on the outer peripheral surface of the cylinder 23, and an outer cylinder 25 made of a permanent magnet fixed on the outer peripheral surface of the intermediate cylinder 24. The magnet outer cylinder 25 has N poles and S poles alternately formed in the cylindrical direction. Further, an inner thread 26 that meshes with the outer thread 17 of the valve shaft 9 is formed in the center hole of the inner cylinder 23, and the valve shaft 9 is configured to move in the axial direction by the rotation of the rotor 10.

In the thus configured idling speed control valve, when a control pulse is applied to the stators 11 and 12, the rotor outer cylinder 25 moves with respect to the stators 11 and 12, thereby rotating the rotor 10. When the rotor 10 rotates, the valve shaft 9
Since the outer thread 17 and the inner thread 26 of the rotor inner cylinder 23 mesh with each other, the valve shaft 9 moves in the front-rear direction. As a result, the valve body
The cross-sectional area of the outlet 6a formed between the valve 20 and the valve seat 8 increases or decreases,
The air flow rate in the bypass passage is controlled.

[Problems to be Solved by the Invention]

In the conventional idling speed control valve for an internal combustion engine, the rotation of the step motor 1 is converted into the linear motion of the valve shaft 9 to control the air flow rate as described above. For this reason, there is a problem in that the shape becomes large and the cost is high because a conversion mechanism to the linear motion is required.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an idling speed control valve for an internal combustion engine which can be reduced in size and weight and can be reduced in cost.

[Means for Solving the Problems]

An idling speed control valve for an internal combustion engine according to the present invention communicates with a valve having an inclined end surface in the axial direction and a bypass passage, at least one of which is provided on the outer peripheral side of the valve and is opened by rotation of the valve. It is provided with an inflow port and an outflow port whose area changes.

[Work]

In the present invention, the opening area of at least one of the inlet and the outlet changes due to the rotational movement of the valve, and the air flow rate in the bypass passage is controlled.

〔Example〕

FIG. 1 is a configuration diagram of an intake system using an idling speed control valve of an internal combustion engine according to an embodiment of the present invention.
In the figure, 27 is the intake passage of the internal combustion engine,
A throttle valve 28 is arranged inside 27. Further, one end of the bypass pipeline 29 is opened on the upstream side of the throttle valve 28 of the intake passage 27, and the other end of the bypass pipeline 29 is opened on the downstream side. Reference numeral 30 is an idling speed control valve, the details of which are shown in FIGS. 2 and 3.

In FIGS. 2 and 3, reference numeral 31 denotes a housing, which accommodates the sleeve 32, the valve 33 and the step motor 34. An inflow passage 35 and an inflow passage 36 are formed in the housing 31, and an inflow port 37 and an outflow port 38 provided in the sleeve 32 are connected to the inflow passage 35 and the outflow passage 36, respectively. The sleeve 32 is integrally fixed to the housing 31. The valve 33 has a cylindrical shape and its end surfaces are inclined surfaces 33a and 33b, and are arranged so as to rotate with a minute gap between them and the inner peripheral surface of the sleeve 32. The step motor 34 constitutes a rotational driving means for the valve 33, and its bracket 39, stator 40, and coil 41 are concentrically fixed to the housing 31. Further, a metal 42 is fixed to the bracket 39, and the magnet 43, the mold 44,
A rotor 46 including a shaft 45 is rotatably supported, and one end of the shaft 45 is fixed to the valve 33. In addition, 47 is a valve for the rotor 46 in order to eliminate rattling of the rotor 46.
A spring biasing in the 33 direction and a cover 48 covering the rear surface of the housing 31.

Next, the operation will be described. In the step motor 34, as in the conventional case, the rotor 46 is normally or reversely rotated by switching the energization of the coil 41 of the stator 40. Now the rotor
When 46 is driven in the normal direction and the valve 33 is rotated a predetermined angle from the fully closed position of the inflow port 38, as shown in FIG.
The relative position between the inclined surface 33a and the inclined surface 33a deteriorates, and the opening area of the outlet 38 changes according to the rotation angle of the valve 33. Then, when the valve 33 further rotates, the end surface located at the outlet 38 becomes the inclined surface 33b, the opening area increases, and the air flow rate of the bypass conduit 29 increases. Here, the inflow port 37 is formed with inclined surfaces 33a and 33b of the valve 33 so that the inflow port 37 is always in communication with the inside of the sleeve 32 even when the valve 33 is rotated, and the flow rate is controlled by opening and closing the outflow port 38. It has become. Further, the inclination angle of the inclined surface 33b with respect to the circumferential direction of the valve 33 is the inclination surface 33a.
Is larger than the angle. That is, the flow rate control amount with respect to the rotation of the valve 33 is set to be small in the low opening range and set to be large in the high opening range. Therefore, minute flow rate control in the low opening range becomes possible, and the responsiveness of the flow rate control in the high opening range becomes good. Further, the inclined surface 33a of the valve 33 is parallel to the side 38a on the fully closed side of the outlet 38,
Further, since the inclined surface 33b is formed so as to be parallel to the side 38b on the fully open side of the outflow port 38, the change in the opening area with respect to the rotation of the valve 33 is constant at the fully closed and fully opened sides of the outflow port 38.

Further, when the step motor 34 rotates in the reverse direction, the valve 33 rotates in the opposite direction to reduce the opening area of the outflow port 38, and by repeating such an operation, the air in the bypass pipe line 29 corresponding to a predetermined idling speed is obtained. The flow rate is controlled.

In the above embodiment, as the control of the flow rate from the inflow port 37 to the outflow port 38, the inflow port 37 is fully opened and the opening area of the outflow port 38 is changed, but the invention is not limited to this. The opening area on the side of the inflow port 37 may be changed, or the opening area of both the inflow port 37 and the outflow port 38 may be changed. Further, the inlet 37 and the outlet 38
The opening of which the opening area is not controlled by the valve 33 may be provided at another position such as a side surface instead of the outer peripheral side of the valve 33.

Further, in the above-described embodiment, the valve 33 has a cylindrical shape with an inclined end surface and the end surface is open. However, the shape is not limited to this, and even if the inclined surface is a closed end surface, The same effect as the embodiment is obtained.

〔The invention's effect〕

As described above, according to the idling speed control valve for the internal combustion engine of the present invention, the flow rate control is performed by changing the opening area of at least one of the inlet and the outlet by the rotation of the valve whose end surface is an inclined surface. I decided to do it,
Since the valve straight-moving mechanism is not required, it can be made compact and lightweight,
Moreover, there is an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an intake system using an idling speed control valve for an internal combustion engine according to an embodiment of the present invention, FIG. 2 is a sectional view of the idling speed control valve for the internal combustion engine, and FIG. 2 is a cross-sectional view taken along the line AA, FIG. 4 is a view showing the relationship between the valve and the outlet of the idling speed control valve of the internal combustion engine, and FIG. 5 is a cross section of the conventional idling speed control valve of the internal combustion engine. It is a figure. 27 ... Intake passage, 28 ... Throttle valve, 29 ... Bypass line, 30 ... Idling speed control valve, 32 ... Sleeve, 33 ... Valve, 33a, 33b ... Inclined surface, 34 ... Step Motor, 35 ... Inflow passage, 36 ... Outflow passage, 37 ...
… Inlet, 38 …… Outlet. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An idling rotation of an internal combustion engine, which is arranged in a bypass passage bypassing a throttle valve provided in an intake passage of the internal combustion engine, and controls an idling speed by controlling an amount of intake air flowing through the bypass passage. In the number control valve, a valve having a circular cross section in the direction orthogonal to the rotation axis and an axial end surface that is an inclined surface communicates with the bypass passage, and at least one of the valves is provided on the outer peripheral side of the valve. An idling speed control valve for an internal combustion engine, comprising an inflow port and an outflow port whose opening area changes by rotation, and a drive means for rotating the valve.