JPH11280561A - Egr valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply constitute a sensor with a high reliability by forming a hollow chamber on a case part of a valve motor for operating an EGR valve mechanism, and arranging a positioning part for a sensor substrate in a chamber for a sensor partitioned by a supporting wall part in the hollow chamber. SOLUTION: An EGR valve device is composed of an EGR valve mechanism 1 and a motor for an EGR valve, and a sensor rotor 37 is arranged on a rotor shaft 21 end part of the motor 2 in an opening end part side of a case part 3b. A sensor substrate 39 is mounted and supported on the supporting wall part 30 so as to be brought into sliding-contact with a sensor wiper 38 on the sensor rotor 37. In this case, the inside of the case part 3b is partitioned into a chamber 3c for a rotor and a chamber 3d for a sensor by the supporting wall part 30. The sensor substrate 39 is arranged on an opening end part side of the case part 3b, and is mounted on a vertical wall part 42 of the supporting wall part 30, and is positioning-supported to the case part 3b, and the opening end part of the case part 3b is closed by a cover 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an exhaust gas recirculation valve device (Exha) provided in an exhaust gas recirculation system.
ust Gas Recirculation Val
ve).

[0002]

2. Description of the Related Art Conventionally, as this kind of EGR valve device, for example, a device described in Japanese Utility Model Laid-Open Publication No. 7-29380 is known, and in such a known EGR valve device, a motor portion is constituted. In order to perform the operation of the actuator, particularly the positioning operation, by feedback control or the like using a sensor, a sensor that can be used as a single item is usually attached to a part of the actuator later.

[0003]

However, in such a conventional mounting method, two separately manufactured cases must be connected in order to use the sensor after being mounted on the actuator. , And therefore larger,
A connector is also required separately, and it is necessary to connect the axis of the sensor and the actuator. When connecting, a spigot part for aligning the axis is required, and the output shaft of the actuator and the output voltage of the sensor However, there is a problem that the size is increased and the cost is increased, for example, it is necessary to adjust to match the size.

Accordingly, an object of the present invention is to provide an EGR valve device in which a sensor can be easily and reliably formed in a case portion of a valve motor in order to solve such a conventional problem. It is in.

[0005]

According to the present invention, there is provided an EGR valve device comprising: a sensor for detecting the rotation of a rotor of a valve motor; In the EGR valve device for operating the mechanism, a sensor chamber capable of forming the sensor is formed in a motor case that houses the valve motor, and a support wall is provided in the motor case to provide an interior. A rotor is divided into a chamber for the rotor and a chamber for the sensor, and a positioning portion for positioning a sensor substrate of the sensor is provided inside the chamber for the sensor.

Further, the EGR valve device of the present invention is characterized in that a wiring positioning portion for positioning the wiring of the valve motor is provided on the support wall.

Further, in the EGR valve device according to the present invention, the valve motor is a DC motor having a commutator and a brush portion, and a connecting portion between the commutator and the brush portion is located in a chamber for the rotor. Features.

Furthermore, the EGR valve device of the present invention
The sensor includes a sensor rotor having a wiper, and a sensor rotor of the sensor is connected to an end of a rotor shaft of the valve motor extending into a chamber for the sensor.

[0009] Other objects and features of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing the entirety of an EGR valve device according to the present invention. FIGS. 2 to 8 show similar steps showing the steps of assembling the EGR valve device according to the present invention. It is sectional drawing.

As shown in FIG. 1, the valve device according to the present invention is used for, for example, an EGR valve of an automobile engine.
As shown, the valve device includes an EGR valve mechanism 1.
And the EGR valve motor 2. The case 3 is formed of a valve case 3a and a motor case 3b, and the case 3a and the case 3b are connected via a partition member 4 and a spacer 5.

The EGR valve mechanism 1 includes a valve shaft 6 slidably supported in a valve case portion 3a in the axial direction via a guide seal 7 and a guide plate 8.
A coil that presses a valve 9 attached to the tip of the valve shaft 6 and a spring seat 12 attached to the other end of the valve shaft 6 so as to elastically urge the valve 9 toward the valve seat 10 in a closing direction. A guide seal cover 14 for the guide seal 7 is provided.

The EGR valve motor 2 is a DC motor, and includes a motor case 3b as a motor case, a rotor shaft 21 having a hollow shaft hole rotatably provided in the case 3b, and a rotor shaft. A rotor 22 having a rotor core 23 and a coil 24 formed integrally with the shaft 21 and having a female threaded portion on a peripheral surface of an elongated hollow shaft hole portion along a central axis, and an outer peripheral portion of the rotor core 23 of the rotor 22 And a stator 25 and a magnet 26, which are provided at predetermined intervals and are fixed to the case portion 3b. The rotor shaft 21 is formed integrally with the rotor 22, and the rotor shaft 21 is
The lower part of the rotor 22 is rotatably supported by the bearing 32 of the partition member 4.

A female screw portion 22a is formed on a peripheral surface of a shaft hole portion at the center of the rotor 22, and a lead screw 27 forming a male screw portion to be screwed with the female screw portion 22a is provided. The lead screw 27 has a shaft portion 27a having a substantially D-shaped cross section, and has a corresponding D-shaped cross section.
A bush 28 having a V-shaped hole is supported in the shaft hole of the rotor 22 so that it cannot rotate but can reciprocate in the axial direction. Further, the rotor 22 is provided with a rotor stopper 43 and a return spring 44, and the rotor stopper 43 is brought into contact with and locked by a stopper portion 43b provided on the case portion 3b (FIG. 11). . Further, one end 44a of the return spring 44 is locked to the rotor 22, and the other end 44b is locked to the case 3b (FIG. 10).

At the other end of the rotor 22, a commutator 33 is provided on the rotor shaft 21. A brush member 34 is supported on the support wall 30 of the case portion 3b by the commutator 33, and a spring seat is provided. 36 is elastically pressed by a spring 35.

That is, a brush member 34 is guided in a guide hole 30b having a rectangular cross section of the support wall portion 30 so as to be movable in the vertical direction in FIG. 1, and the brush member 34 is pressed by a commutator 33 by a spring 35. . L
Is a wire (wiring) having one end connected to the brush member 34. The wire is drawn through a notch 30c (see FIG. 13) formed in the side wall of the guide hole 30b in a vertical shape, and an intermediate portion thereof is drawn. It is sandwiched and locked in a guide groove 30d (see FIG. 13) formed in the support wall 30.
The other end is connected to the corresponding terminals T1 and T5.
As shown in FIG. 13, the guide groove 30d is
It is formed between the opposing surfaces of the protrusions protruding at 0 (in the case of this example, between the peripheral wall 30e and the protrusion 30f). Also,
The notch 30c, the guide groove 30d, and a spring seat 36 described later constitute a positioning portion for positioning the wire L.

Further, a sensor rotor 37 is provided at the end of the rotor shaft 21, that is, at the upper end in FIG. 1, at the open end of the case portion 3 b, and the sensor wiper 38 on the sensor rotor 37 is in sliding contact. Sensor board 3
9 is mounted and supported on the support wall 30. That is, a vertical wall portion 42 is formed in the support wall portion 30, and the sensor substrate 39 is accommodated and supported on the wall portion 42. Further, the wall portion 42 is
May be partially protruded inward so as to support, or may be formed as a flange continuous in a ring shape. Further, a cover 40 is provided at the open end of the case 3b via the sensor board 39 and the packing 41 so as to close the case 3b.

The inside of the case 3b is divided into a chamber 3c for the rotor and a chamber 3d for the sensor substrate by the support wall 30, and the chamber 3 for the sensor substrate is formed by the support wall 30.
d are independently formed.

Therefore, the rotor 2 is provided in the rotor chamber 3c.
2 are provided, and a brush member 34 is provided on the support wall portion 30 so as to contact the commutator 33 on the rotor 22. The brush member 34 protrudes downward from the support wall 30 in the drawing, is pressed by a spring 35 supported by a spring seat 36, and is held so that its tip slides with the commutator 33.
Therefore, dust such as abrasion powder generated by sliding between the brush member 34 and the commutator 33 is prevented from entering the sensor substrate chamber 3d by the support wall portion 30, and the reliability of the sensor is improved. .

On the other hand, a sensor board 39, a sensor wiper 38, a sensor rotor 37 and a spring seat 36 are provided in the sensor board chamber 3d.
The chamber 3 d for the sensor substrate is closed by the cover 40 via 1. A sensor substrate 39 is provided on the sensor rotor 37.
A sensor wiper 38 is provided so as to slide on the sensor resistor. Further, the spring seat 36 is fixed to the protruding portion 30a of the support wall portion 30 by an appropriate fixing means such as heat caulking or a screw.

The sensor board 39 is provided on the opening end side of the case section 3b, and is positioned and supported by the case section 3b by being placed on a vertical wall section 42 of the support wall section 30. Sensor terminals T2 ', T3' and T4 'are provided for such a sensor board 39.

That is, as shown in FIGS. 1 and 9, the sensor substrate 39 is formed in an annular shape, for example, from ceramics or the like, and the base ends of the sensor terminals T2 ', T3', T4 'are attached by rivets or screws. Have been. A sensor board 39 to which such sensor terminals T2 ', T3', T4 'are attached is provided on the opening end side of the case portion 3b as shown in the figure. Thus, the sensor substrate 3
9 is positioned and mounted on the wall portion 42 of the case portion 3b, and the cover 40 is attached via the packing 41 so as to close the open end of the case portion 3b. It is to be held suitably. The terminals T2 ', T3', T4 'are connected to the corresponding sensor connector terminals T2, T3, T4.

Therefore, the sensor board 39 is supported by the support wall 30.
In the chamber 3d for the sensor substrate partitioned by
It is positioned and supported by the support wall 30 and the wall 42. The lower side of the sensor substrate 39 (the lower side in the direction of FIG. 1)
Is provided with a sensor resistor 32a (FIG. 9), and the sensor wiper 38 on the sensor rotor 37 is suitably slid so that the rotational position of the rotor 22 can be accurately detected. .

The EG according to the present invention configured as described above
In the R valve device, the assembly of the EGR valve motor 2 and the assembly of the valve mechanism 1 and the EGR valve motor 2 are performed as follows.

First, as shown in the lower part of FIG.
The valve mechanism 1 is configured such that a coil spring 11 and a spring seat 12 are attached by inserting the other end of a valve shaft 6 having a valve 9 attached to a tip thereof into a hole of a guide seal 7 attached to a case portion 3a. Mechanism 1
Is prepared.

On the other hand, the EGR valve motor 2 is shown in FIG.
In particular, as shown in FIGS. 3 and 4, a stator 25 and a magnet 26 which form a yoke in advance in a motor chamber 3c of a case portion 3b formed of a plastic material are inserted into the case portion 3b by insert molding. Along with
The rotor 22 is incorporated in such a case portion 3b as shown in FIG. In the rotor 22, the tip of the rotor shaft 21 is inserted into the hole of the support wall 30, and the bearing on the rotor shaft 21, that is, the bearing 31 is fitted into the hole of the support wall 30. At the same time, the inner end 44a of the coil spring 44 forming the return spring is hooked on the rotor 22 and the outer end 44a.
b is hooked on the case 3b, and the coil spring 44 is set. A rotor core 23, a coil 24, and a commutator 33 constituting the rotor 22 are mounted on the rotor shaft 21 in addition to the bearing 31. Therefore, as shown in FIG. 5, the bearing 31, the commutator 33, the coil 24, and the rotor core The rotor 22 is mounted on the case portion 3b in the order of 23, and the coil spring 44 is assembled.

Next, as shown in FIG. 6, the partition member 5 on which the bush 28, the wave washer 29, and the bearing 32 are mounted is assembled and attached to the lower end of the rotor shaft 21 of the rotor 22. At the same time, while attaching the brush member 34 and the brush spring 35,
The spring seat 36 is placed on the support wall 30 on which the tip of the rotor shaft 21 is supported, and the protrusion 30a
Is fixed by heat, for example, by heating to fix the spring seat 36 on the support wall 30 (FIG. 7). The wire L previously connected to the brush member 34 is pulled out from the notch 30C, and the intermediate portion thereof is connected to the guide groove 3.
0d, and the other end corresponding to terminal T1, T5
Connect to The wire L is pressed by the spring seat 36.

As shown in FIG. 7, when the spring seat 36 is mounted on the support wall 30, the sensor rotor 37 is mounted on the tip of the rotor shaft 21 and fixed by a nut 45 (FIG. 8). After the sensor rotor 37 has been assembled in this manner, the sensor substrate 39 is placed on the wall 42 of the upper end opening of the case 3b and set, and the terminals T2 ', T3', T4 'are connected to the corresponding sensors. If it is attached by welding or brazing to the terminals T2, T3, T4 (FIG. 9), the packing 41 is arranged on the sensor board 39, and the cover 40 is attached to the opening of the case portion 3b,
The EGR valve device of the present invention shown in FIG. 1 is completed.

In the EGR valve device of the present invention, as shown in FIGS. 1 and 2, the EGR valve mechanism 1 has an axial direction through a guide seal 7 and a guide plate 8 in a case portion 3a. A valve shaft 6 slidably supported on the valve shaft 6, a valve 9 attached to the tip of the valve shaft 6, and a valve shaft 6 that elastically urges the valve 9 against a valve seat 10 in a closing direction. The EGR valve motor 2 is a DC motor, and further includes a motor case 3b, which is a motor case, and a motor case 3b. A rotor shaft 21 having a hollow shaft hole portion rotatably provided on the rotor shaft 21; and a narrow shaft formed integrally with the rotor shaft 21 and extending along a central axis. A rotor 22 having a female screw portion 22a formed on a peripheral surface of a hollow shaft hole, a stator 25 and a magnet 26 provided at predetermined intervals on an outer peripheral portion of the rotor 22, and a central shaft of the rotor 22; It has a female screw portion 22a formed on the peripheral surface of the hole portion and a lead screw 27 formed from a male screw portion to be screwed. The lead screw 27 cannot be rotated by the bush 28, but can reciprocate in the axial direction. The rotor 22 has a rotor stopper 43 and a return spring 4
4 is provided, and the rotor stopper 43 is
b and comes into contact with and is locked by a stopper portion 43b provided on the b.

The other end of the rotor 22 has a commutator 33 on the rotor shaft 21, a brush member 34 supported on the support wall portion 30 and elastically pressed by a spring 35, and an end portion of the rotor shaft 21. Sensor rotor 3
The sensor substrate 39 is positioned and supported on the support wall 30 so that the sensor wiper 38 makes sliding contact.

The interior of the case 3b is divided into a chamber 3c for the rotor and a chamber 3d for the sensor substrate by the support wall 30. Therefore, wear particles generated by sliding between the brush member 34 and the commutator 33 are removed. The support wall 30 prevents dust such as dust from entering the sensor substrate chamber 3d, thereby improving the reliability of the sensor.

On the other hand, a sensor substrate 39, a sensor wiper 38, a sensor rotor 37 and a spring seat 36 are provided in the sensor substrate chamber 3d.
The chamber 3 d for the sensor substrate is closed by the cover 40 via 1. A sensor substrate 39 is provided on the sensor rotor 37.
A sensor wiper 38 is provided so as to slide on the sensor resistor. Further, the spring seat 36 is fixed to the protruding portion 30a of the support wall portion 30 by an appropriate fixing means such as heat caulking or a screw.

The sensor substrate 39 is provided on the opening end side of the case portion 3b, and has a peripheral wall portion 30e of the support wall portion 30,
The case portion 3b is formed by the vertical wall portion 42 of the support wall portion 30.
It is positioned and supported. Such a sensor board 39
Are provided with sensor terminals T2 ', T3', T4 '.

Accordingly, the sensor substrate 39 is mounted on the support wall 30.
It is positioned and supported in the sensor substrate chamber 3d partitioned by the above. Further, a sensor resistor is provided below the sensor substrate 39 so that the sensor wiper 38 on the sensor rotor 37 can slide properly and the rotational position of the rotor 22 can be accurately detected. Have been.

As described above, by positioning and supporting the sensor board 39 on the motor case 3b, a sensor-dedicated case is not required, and the sensor and motor connector terminals T1 to T5 are the same connector terminal. Therefore, the cost can be reduced, and the configuration described above allows the motor and the sensor shaft to be easily aligned with each other, and the rotor stopper 43 of the motor serves as the stopper of the case portion 3b. By being configured to be brought into contact with and locked by the portion 43b, the position of the sensor substrate 39 and the position of the stopper portion 43b in the rotation direction of the rotor 22 are easily determined, so that the performance is further improved. Further, the case portion 3c is divided into a rotor chamber 3c and a sensor substrate chamber 3d by the support wall portion 30, and a motor brush member 34 and a brush spring 35 are arranged from the sensor substrate chamber 3d side. Can be set, so that it is easy to assemble and work is easy, and the assembling time can be shortened.

[0036]

As described above, in the EGR valve device according to the first aspect of the present invention, the EGR valve mechanism operates the EGR valve mechanism by the rotation of the rotor while detecting the rotation of the rotor of the valve motor by the sensor. In the device, a chamber for a sensor that can constitute the sensor is formed in a case for a motor that houses the motor for a valve, and a support wall is provided in the case for the motor so that the inside is a chamber for the rotor. The sensor chamber is divided into a chamber for the sensor, and a positioning portion for positioning the sensor substrate of the sensor is provided inside the chamber for the sensor. The sensor can be easily constructed, and the sensor can be constructed in a room that is not affected by the environment in the rotor room to improve the reliability of the sensor. Can.

In the EGR valve device according to a second aspect of the present invention, since the wiring wall positioning portion for positioning the wiring for the valve motor is provided on the support wall, the wiring for the valve motor and the sensor for the sensor are provided. Prevent interference with moving parts,
In addition, the workability of assembling the components of the sensor can be improved.

Further, in the EGR valve device according to a third aspect of the present invention, the valve motor is a DC motor having a commutator and a brush portion, and a connection portion between the commutator and the brush portion is provided in the rotor chamber. Because the valve motor is a direct current motor, the contact portion between the commutator and the brush portion is located in the rotor room, so that the sensor room is protected from dust such as brush members and the like, Reliability can be ensured.

The EGR according to claim 4 of the present invention.
The valve device is provided with a sensor rotor having a sensor having a wiper, and connecting the sensor rotor of the sensor to an end of a rotor shaft of the valve motor extending to a chamber for the sensor, thereby providing a sensor for the valve. The relationship between the motor and the sensor can be accurately regulated, and the reliability of the sensor can be further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an entire EGR valve device of the present invention.

FIG. 2 shows the EGR valve device of FIG.
It is a longitudinal cross-sectional view separately shown with a valve motor.

FIG. 3 is a longitudinal sectional view of a case showing a first step of an assembly procedure of the EGR valve device of the present invention.

FIG. 4 is a plan view of the case of FIG. 3;

FIG. 5 is a longitudinal sectional view showing a state where the rotor is incorporated in the case of FIG. 3;

6 is a longitudinal sectional view showing a state where a partition member is incorporated in the case and the rotor of FIG. 5;

7 is a longitudinal sectional view showing a state where a spring seat is mounted on the rotor assembly of FIG. 6;

8 is a longitudinal sectional view showing a state where a sensor rotor is assembled to the assembly of FIG. 7;

FIG. 9 is a bottom view showing the motor and sensor terminals of FIG. 8;

FIG. 10 is a plan sectional view showing a return spring incorporated in a case portion.

FIG. 11 is a plan sectional view showing a stopper part on the rotor side and a stopper part on the fixed side.

FIG. 12 is a longitudinal sectional view of the rotor assembly.

FIG. 13 is a plan view showing a state where a brush member is assembled.

[Explanation of symbols]

 Reference Signs List 1 EGR valve mechanism 2 EGR valve motor 3 Case 4 Partition member 5 Spacer 6 Valve shaft 7 Guide seal 8 Guide plate 9 Valve 10 Valve seat 11 Coil spring 12 Spring seat 21 Rotor shaft 22 Rotor 23 Rotor core 24 Coil 25 Stator 26 Magnet 27 Lead screw 28 Bush 29 Wave washer 30 Support wall 30a Projection 31 Bearing 32 Bearing 33 Commutator 34 Brush member 35 Spring 36 Spring seat 37 Sensor rotor 38 Sensor wiper 39 Sensor board 40 Cover 41 Packing 42 Wall

Claims (4)

[Claims] An EGR is performed by detecting rotation of a rotor of a valve motor by a sensor and detecting rotation of the rotor by a sensor.
In an EGR valve device for operating a valve mechanism, a chamber for a sensor that can constitute the sensor is formed in a motor case that houses the valve motor, and a support wall is provided in the motor case to form an inside. An EGR valve device, wherein the EGR valve device is divided into a chamber for the rotor and a chamber for the sensor, and a positioning portion for positioning a sensor substrate of the sensor is provided inside the chamber for the sensor. 2. The EGR valve device according to claim 1, wherein a wiring positioning portion for positioning the wiring of the valve motor is provided on the support wall. 3. The valve motor according to claim 1, wherein the valve motor is a DC motor having a commutator and a brush portion, and a connecting portion between the commutator and the brush portion is located in the chamber for the rotor. An EGR valve device according to any of the preceding claims. 4. The sensor according to claim 1, wherein the sensor includes a sensor rotor having a wiper, and the sensor rotor of the sensor is connected to an end of a rotor shaft of the valve motor extending into a chamber for the sensor. Item 4. The EGR valve device according to any one of Items 1 to 3.