JP2010065531A - Egr integrated throttle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an EGR integrated throttle device easy in installing a throttle valve element, even if a shaft is further obliquely arranged to a throttle flow passage, by preventing an increase in intake resistance, by preventing reduction in an EGR quantity. <P>SOLUTION: An EGR flow passage 2 is slantingly connected at an acute angle to the upstream side of the throttle flow passage 1. Thus, flow passage resistance of a downstream part of the EGR passage 2 reduces, and reduction in the EGR quantity is prevented. An increase in the intake resistance is restrained by reducing inconvenience of disturbing intake air flowing in the throttle flow passage 1 by an outlet part of the EGR flow passage 2 by slantingly connecting the EGR flow passage 2 at an acute angle to the upstream side of the throttle flow passage 1. Although the shaft 4 is further obliquely arranged to the throttle flow passage 1, the throttle valve element 5 is easily installed by adopting a structure for installing the throttle valve element 5 in the end part of the shaft 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an EGR-integrated throttle device in which an EGR (exhaust gas recirculation) valve is integrated with a throttle device that controls an intake air amount of an internal combustion engine (hereinafter referred to as an engine), and in particular, an EGR together with a throttle valve body. The present invention relates to a technique for simultaneously driving valve bodies by a common shaft.

  Conventionally, as a technique for simultaneously driving two valve bodies by a common shaft, as shown in FIG. 4, a throttle valve body 5 disposed inside the throttle flow path 1, and blow-by gas is supplied to the downstream side of the intake of the throttle valve body 5. The PCV valve body 6 ′ disposed inside the blow-by gas flow path 2 ′ leading to the side is disposed coaxially, and the throttle valve body 5 and the PCV valve body 6 ′ are simultaneously driven by the common shaft 4, A PCV-integrated throttle device that simultaneously controls the intake air amount and the blow-by gas recirculation amount is known (see, for example, Patent Document 1).

As shown in FIG. 4, this technique has a restriction that the “rotation axis of the throttle valve body 5” and the “rotation axis of the PCV valve body 6 ′” are arranged “on the axis of the shaft 4”. 1 and the blow-by gas flow path 2 'were provided in parallel. For this reason, a structure has been adopted in which the downstream portion of the blow-by gas channel 2 ′ is connected to the throttle channel 1 in a state of being bent at a right angle.
As a result, the channel is suddenly bent at the downstream portion of the blow-by gas channel 2 ′, resulting in an increase in the channel resistance of the blow-by gas channel 2 ′.

Therefore, when the PCV valve body 6 ′ of Patent Document 1 is replaced with the EGR valve body 6, that is, the throttle valve body 5 and the EGR valve body 6 are simultaneously driven by the common shaft 4, and the intake air amount and the EGR amount If an attempt is made to control the two at the same time, the EGR amount will decrease due to an increase in channel resistance due to the bending of the channel in the downstream portion of the EGR channel 2. Due to the decrease in the EGR amount, there is a concern that the effect of reducing the combustion temperature is reduced, and the effect of reducing NOx generated in the exhaust gas is reduced.
In addition, since the EGR flow path 2 is connected at a right angle to the throttle flow path 1, the outlet portion of the EGR flow path 2 where the intake air flowing through the throttle flow path 1 is connected at a right angle to the throttle flow path 1 There is a concern that it may be disturbed by the engine, leading to an increase in intake resistance and a decrease in engine output.

Therefore, as shown in FIG. 5, by connecting the EGR flow path 2 at an acute angle with respect to the intake upstream side of the throttle flow path 1 (V-shaped connection), it is possible to prevent a decrease in the EGR amount and to reduce the intake resistance. It is conceivable to prevent the increase (not a well-known technique).
However, when the throttle flow path 1 and the EGR flow path 2 are V-connected, at least one of the throttle flow path 1 or the EGR flow path 2 and the shaft 4 are inclined.

Specifically, as shown in FIG. 5A, when the shaft 4 is made to approach the EGR flow path 2 perpendicularly, the shaft 4 is inclined with respect to the throttle flow path 1, and the shaft 4 As a result, it becomes difficult to assemble the throttle valve body 5 to the front.
Alternatively, as shown in FIG. 5 (b), when the shaft 4 is made to approach perpendicularly to the throttle flow path 1, the shaft 4 is inclined with respect to the EGR flow path 2, and the EGR valve is connected to the shaft 4. Assembling the body 6 becomes difficult.
JP 2007-92664 A

The present invention has been made in view of the above problems, and a first object thereof is to prevent a decrease in the EGR amount and an increase in intake resistance, and further, a shaft is provided obliquely with respect to the throttle flow path. However, the present invention is to provide an EGR integrated throttle device in which the throttle valve body can be easily assembled.
In addition, the second object of the present invention is to prevent the EGR amount from decreasing and to prevent an increase in the intake resistance, and even if the shaft is provided obliquely with respect to the EGR flow path, the EGR valve body can be easily assembled. Is providing an EGR integrated throttle device.

[Means of Claims 1 and 2]
(Common means of claims 1 and 2)
According to the first and second aspects, since the EGR flow path is connected at an acute angle with respect to the intake upstream side of the throttle flow path (V-shaped connection), the bending of the downstream portion of the EGR flow path is reduced, and the EGR flow path is reduced. The flow path resistance of the flow path can be reduced, and a problem that the EGR amount is reduced can be avoided. That is, by preventing the EGR amount from being lowered, it is possible to obtain the effect of reducing the combustion temperature by the EGR gas, and to obtain the effect of reducing NOx generated in the exhaust gas.
Further, since the EGR flow path is connected at an acute angle with respect to the intake air upstream side of the throttle flow path (V-shaped connection), the intake air flowing through the throttle flow path is disturbed at the outlet portion of the EGR flow path. As a result, an increase in intake resistance is suppressed, and as a result, a decrease in engine output can be prevented.

(Means of Claim 1)
According to the first aspect of the present invention, when the EGR flow path is inclined at an acute angle with respect to the intake upstream side of the throttle flow path (V-shaped connection), the shaft is caused to approach the EGR flow path perpendicularly. The shaft is provided obliquely with respect to the throttle flow path.
However, according to the first aspect of the present invention, the tip end portion of the shaft is provided so as to transmit the rotational torque to the inside of the throttle flow path without penetrating through the throttle flow path. The throttle valve body is fixed to the tip end portion of the shaft in a state inclined with respect to the shaft axis.
Thus, the throttle valve body can be easily assembled by adopting a structure in which the throttle valve body is attached to the tip end portion of the shaft.

(Means of Claim 2)
According to the second aspect of the present invention, the positional relationship between the throttle flow path and the EGR flow path (the positional relationship of the flow path on the tip end side of the shaft) in the above-described means of the first aspect is reversed.
According to the second aspect of the present invention, when the EGR flow path is inclined at an acute angle with respect to the intake upstream side of the throttle flow path (V-shaped connection), the shaft is caused to approach the throttle flow path perpendicularly. The shaft is provided obliquely with respect to the EGR flow path.
However, according to the second aspect of the present invention, the tip end portion of the shaft is provided so as to transmit the rotational torque to the inside of the EGR flow path without penetrating through the EGR flow path. And the EGR valve body is being fixed to the front-end | tip part of the shaft in the state inclined with respect to the axis on the shaft.
Thus, the EGR valve body can be easily assembled by adopting a structure in which the EGR valve body is attached to the tip portion of the shaft.

(Summary of means of claims 1 and 2)
That is, by adopting the means of claim 1, the EGR amount is prevented from being lowered, the intake resistance is prevented from being increased, and even if the shaft is provided obliquely with respect to the throttle flow path, the throttle valve body is assembled. Can be easily done.
Further, by adopting the means of claim 2, the EGR amount is prevented from decreasing, the intake resistance is prevented from increasing, and the EGR valve body is assembled even if the shaft is provided obliquely to the EGR flow path. Can be easily done.

[Means of claim 3]
In the EGR integrated throttle device employing the means of claim 3, the bearing on the tip end side of the shaft is elastic between the shaft inserted into the bearing or between the throttle body supporting the outer periphery of the bearing. A deformable elastic body is provided.
A valve body (throttle valve body or EGR valve body) fixed to the tip of the shaft is in a cantilever state and easily vibrates, but the vibration can be absorbed by the elastic body.

[Means of claim 4]
The outer periphery of the bearing on the tip end side of the shaft in the EGR integrated throttle device adopting the means of claim 4 is press-fitted and fixed to the throttle body, and the elastic body is formed between the bearing on the tip end side of the shaft and the shaft. Between.
Thereby, an elastic body can absorb the assembly clearance between the inner periphery of the bearing on the tip end side of the shaft and the shaft.

[Means of claim 5]
In the EGR integrated throttle device adopting the means of claim 5, the bearing on the tip end side of the shaft is press-fitted into the outer periphery of the shaft, or the throttle valve body fixed to the tip end portion of the shaft or the outer periphery of the EGR valve body. The elastic body is provided between the bearing on the tip end side of the shaft and the throttle body.
Thereby, the elastic body can absorb the assembly clearance between the outer periphery of the bearing on the tip end side of the shaft and the throttle body.

[Means of claim 6]
The valve body (throttle valve body or EGR valve body) fixed to the tip of the shaft in the EGR integrated throttle device employing the means of claim 6 is filled with resin in the gap between the valve body and the shaft. It is cured and fixed to the shaft.

[Means of Claim 7]
The valve body (throttle valve body or EGR valve body) fixed to the tip portion of the shaft in the EGR integrated throttle device adopting the means of claim 7 is fixed to the shaft using a rivet. The plug is provided to close the caulking force application hole for applying the caulking force to the rivet from the outside of the throttle body.

BEST MODE FOR CARRYING OUT THE INVENTION The EGR integrated throttle device according to the first and second embodiments includes a throttle flow path that forms part of an intake pipe of an engine, a throttle valve body that adjusts the opening of the throttle flow path, and an intake downstream of the throttle valve body. The EGR passage connected to the throttle passage in the EGR pipe connecting the side and the exhaust pipe, the EGR valve body for adjusting the opening degree of the EGR passage, the throttle valve body and the EGR valve body are arranged coaxially Thus, the throttle passage and the EGR passage are formed in a common throttle body.
The EGR flow path is connected (V-shaped connection) in an inclined state with respect to the intake upstream side of the throttle flow path.

In the best mode 1, the shaft is inserted and assembled from the EGR passage side, and the shaft is brought close to the EGR flow path perpendicularly. The shaft penetrates the EGR flow path and crosses, and the shaft is connected to the throttle flow. The tip of the shaft is provided so as to transmit the rotational torque to the inside of the throttle flow path without being inclined with respect to the road and without the shaft penetrating through the throttle flow path and traversing.
The EGR valve body is fixed to an intermediate portion of the shaft in the EGR flow path.
The throttle valve body is fixed to the tip end portion of the shaft while being inclined with respect to the shaft axis in the throttle flow path.

The best mode 2 is one in which the shaft is inserted and assembled from the throttle passage side, and the shaft is close to the throttle flow path perpendicularly. The shaft penetrates through the throttle flow path and crosses the EGR flow. The tip of the shaft is provided so as to transmit the rotational torque to the inside of the EGR flow path without being inclined with respect to the road and without the shaft penetrating and traversing the EGR flow path.
The throttle valve body is fixed to an intermediate portion of the shaft in the throttle flow path.
The EGR valve body is fixed to the tip end portion of the shaft in an inclined state with respect to the shaft axis in the EGR flow path.

  An example of an EGR integrated throttle device to which the present invention is applied will be described with reference to FIG. The EGR integrated throttle device controls the intake air amount (air amount) sucked into the engine and the EGR amount (exhaust gas recirculation amount) at the same time. A throttle body 3 in which a path 1 and an EGR flow path 2 are formed, a shaft 4 rotatably supported by the throttle body 3, and an opening of the throttle flow path 1 attached to the shaft 4 in the throttle flow path 1 A throttle valve body 5 that performs adjustment, an EGR valve body 6 that is attached to the shaft 4 in the EGR flow path 2 to adjust the opening degree of the EGR flow path 2, and an electric actuator 7 that rotationally drives the shaft 4 are provided.

  The electric actuator 7 includes an electric motor that generates a rotational force when energized, a gear reduction device that attenuates and transmits the rotational output of the electric motor to the shaft 4, a spring device that returns the shaft 4 to a predetermined opening degree, and the shaft 4 A rotation angle detecting device for detecting the rotation angle of the rotation angle. The electric motor is energized and controlled by an ECU (abbreviation of engine control unit).

The throttle body 3 is made of a metal material such as aluminum or a resin material such as a heat resistant resin.
The throttle flow path 1 formed in the throttle body 3 is a substantially cylindrical intake passage that is interposed in the middle of the intake pipe and forms a part of the intake pipe.
The EGR flow path 2 formed in the throttle body 3 forms a part of an EGR pipe that connects the throttle flow path 1 and the exhaust pipe on the intake downstream side of the throttle valve body 5. Specifically, the EGR flow path 2 of the throttle body 3 is a substantially cylindrical EGR gas path that forms a portion connected to the throttle flow path 1.

  A gear cover 8 that can be attached and detached by screws is provided on the outer wall surface of the throttle body 3 on the EGR flow path 2 side. Then, the components (electric motor, gear reduction device, spring device, rotation angle detection device, etc.) of the electric actuator 7 are accommodated in the space formed between the throttle body 3 and the gear cover 8.

  The shaft 4 is formed in a rod shape by a metal material such as stainless steel, and is rotatably supported with respect to the throttle body 3 by two bearings (first and second bearings 11 and 12). The first and second bearings 11 and 12 will be described later.

  The throttle valve body 5 is formed of a metal material or a resin material, is fixed to the shaft 4 in the throttle flow path 1, adjusts the opening of the throttle flow path 1 as the shaft 4 rotates, and sucks it into the engine. It is a rotary valve that adjusts the amount of intake air. The throttle valve body 5 is fixed to a shaft 4 assembled to the throttle body 3, and details thereof will be described later.

  The EGR valve body 6 is formed in a substantially disc shape by a metal material or a resin material, is fixed to the shaft 4 in the EGR flow path 2, and adjusts the opening degree of the EGR flow path 2 as the shaft 4 rotates. The butterfly-type rotary valve that adjusts the amount of EGR gas sucked into the engine. The EGR valve body 6 is also fixed to the shaft 4 assembled to the throttle body 3 in the same manner as the throttle valve body 5, and details thereof will be described later.

A seal ring 13 is attached to the outer peripheral edge of the EGR valve body 6 over the entire circumference, thereby enhancing the closing performance when the EGR valve body 6 closes the EGR flow path 2.
Further, a heat-resistant cylinder 14 made of a heat-resistant material (for example, stainless steel) is assembled inside the EGR flow path 2 where the EGR valve body 6 is mounted. This heat-resistant cylinder 14 forms a heat insulating air layer with the throttle body 3. This makes it difficult for the heat of the high-temperature and high-pressure EGR gas to be transmitted to the throttle body 3, thereby avoiding the problem that the temperature of the throttle body 3 reaches the allowable heat-resistant temperature.

The electric motor is a well-known DC motor that changes the rotation direction when the energization direction is switched and generates a rotational torque according to the energization amount, and is inserted into a motor housing space formed in the throttle body 3. After that, it is fixed to the throttle body 3 by a fastener such as a screw.
The gear reduction device decelerates the rotational torque generated by the electric motor and transmits it to the shaft 4. The gear reduction device includes a motor gear (pinion gear) that rotates integrally with the electric motor, an intermediate gear that is rotationally driven by the motor gear, It consists of a final gear (gear rotor) that is rotationally driven by an intermediate gear, and the final gear rotates integrally with the shaft 4.
Here, the final gear may be mounted directly on the end of the shaft 4, or a coupling member (rotational torque transmission means) is interposed between the final gear and the shaft 4. Also good.

  In the following, the end of the shaft 4 that is driven by the electric actuator 7 (the end that is driven by the final gear) is referred to as a “shaft drive end”, and the end of the shaft 4 that is different from the shaft drive end. (The tip on the side inserted into the throttle body 3 during assembly) will be referred to as a “tip”.

  The spring device keeps the opening degree of the throttle valve body 5 in the fully open position when the current supply to the electric motor is interrupted, and enables the vehicle to retreat. The spring device closes the throttle valve body 5. This is a combination of a return spring that applies a biasing force (valve closing force) and a default spring that applies a biasing force (valve opening force) in the direction of opening the throttle valve body 5.

The rotation angle detection device is a position sensor that detects the opening position of the throttle valve body 5 (and the opening degree of the EGR valve body 6) by detecting the rotational position of the shaft 4, and a magnetic circuit unit that rotates integrally with the shaft 4. And a magnetic detection unit that is attached to a fixing member such as a gear cover 8 and is arranged in a non-contact manner inside the magnetic circuit unit, and a signal corresponding to the rotational position of the shaft 4 (a Hall IC mounted on the magnetic detection unit). Output signal) to the ECU.
The ECU is a known electronic control device equipped with a microcomputer. (I) The throttle opening detected by the Hall IC is set to the target throttle opening set by the accelerator pedal opening ( ii) Alternatively, the electric motor is feedback-controlled so that the EGR opening detected by the Hall IC becomes the target EGR opening corresponding to the vehicle running state.

[Feature Technology 1 of Example 1]
In the EGR integrated throttle device of the first embodiment, the EGR flow path 2 formed in the throttle body 3 is connected (V-shaped connection) in a state inclined at an acute angle with respect to the intake upstream side of the throttle flow path 1. Yes.
Thereby, the bending of the flow path in the downstream portion of the EGR flow path 2 is reduced, and the flow resistance of the EGR flow path 2 can be reduced. For this reason, there is no increase in flow path resistance due to the bending of the EGR flow path 2, and a problem that the amount of EGR is reduced can be avoided. That is, by preventing the EGR amount from being lowered, it is possible to obtain the effect of reducing the combustion temperature by the EGR gas, and to obtain the effect of reducing NOx generated in the exhaust gas.
Further, since the EGR flow path 2 is connected at an acute angle with respect to the intake upstream side of the throttle flow path 1 (V-shaped connection), the intake air flowing through the throttle flow path 1 is disturbed at the outlet portion of the EGR flow path 2. Reduced defects. As a result, an increase in intake resistance of the throttle flow path 1 can be suppressed, and a decrease in engine output can be prevented.

[Feature Technology 2 of Example 1]
As shown in the characteristic technique 1, when the EGR flow path 2 is connected to the intake upstream side of the throttle flow path 1 at an acute angle (V-shaped connection), the throttle flow path 1 or the EGR flow path 2 At least one and the shaft 4 are inclined.
Specifically, in the first embodiment, the shaft 4 is made perpendicular to the EGR flow path 2 and the inclination of the shaft 4 and the throttle flow path 1 is increased. That is, the crossing angle between the shaft 4 and the throttle valve body 5 becomes larger than the crossing angle between the shaft 4 and the EGR valve body 6 (crossing angle of the EGR valve body 6 <crossing angle of the throttle valve body 5).

  Therefore, in the first embodiment, the shaft 4 is inserted from the side surface of the EGR flow path 2 when the shaft 4 is assembled. The shaft 4 penetrates through the EGR flow path 2 and traverses, and the tip end of the shaft 4 transmits the rotational torque to the inside of the throttle flow path 1 without passing through the throttle flow path 1 and traversing. Provided.

  The EGR valve body 6 is fixed to an intermediate portion of the shaft 4 in the EGR flow path 2 after the shaft 4 is assembled to the throttle body 3. Specifically, the EGR valve body 6 has a shaft through hole 15 through which the shaft 4 is disposed, and the shaft 4 is disposed in the EGR flow path 2 when the shaft 4 is assembled to the throttle body 3. The EGR valve body 6 is passed through the shaft through hole 15. And after the shaft 4 is assembled | attached to the throttle body 3, in this Example 1, the EGR valve body 6 is being fixed to the shaft 4 using the screw | thread 16. FIG.

The throttle valve body 5 is fixed to the tip end portion of the shaft 4 in the throttle flow path 1 after the shaft 4 is assembled to the throttle body 3. Specifically, the throttle valve body 5 is fixed to the tip end portion of the shaft 4 in an inclined state with respect to the shaft 4.
Next, an example of a technique for fixing the throttle valve body 5 to the tip portion of the shaft 4 will be described. The throttle valve body 5 of the first embodiment is formed with a shaft fixing hole 17 into which the tip portion of the shaft 4 is inserted. This shaft fixing hole 17 penetrates the inserted shaft 4 coaxially.

A procedure for fixing the throttle valve body 5 will be described. After the shaft 4 is assembled to the throttle body 3, the end of the shaft fixing hole 17 is fitted to the tip of the shaft 4. Subsequently, a resin 21 such as an epoxy resin is filled in the shaft fixing hole 17. As a result, the resin 21 is filled in the gap between the throttle valve body 5 and the shaft 4. And the throttle valve body 5 is fixed to the front-end | tip part of the shaft 4 by hardening the resin 21 with which it filled.
An O-ring 18 is mounted between the shaft 4 and the shaft fixing hole 17 to prevent the resin 21 filled in the shaft fixing hole 17 from leaking from the gap between the tip end of the shaft 4 and the shaft fixing hole 17. It is out.
In this way, by adopting a structure in which the throttle valve body 5 is attached to the distal end portion of the shaft 4, the throttle valve body 5 can be easily moved with respect to the shaft 4 even when the inclination angle between the shaft 4 and the throttle flow path 1 is large. Can be assembled.

[Feature Technology 3 of Example 1]
As shown in the characteristic technique 2, the throttle valve body 5 is fixed to the tip end portion of the shaft 4 in the throttle flow path 1. For this reason, the throttle valve body 5 is in a cantilever state at the tip end portion of the shaft 4 and is in a state in which it easily vibrates. Therefore, it is required that one of the first and second bearings 11 and 12 that support the shaft 4 be close to the throttle valve body 5.
In the first embodiment, the first bearing 11 is provided on the tip end side of the shaft 4 and the second bearing 12 is provided on the shaft driving end side. Specifically, a shaft insertion hole 19 into which the shaft 4 is inserted is formed in the throttle body 3. In the first embodiment, the first bearing 11 is press-fitted into the shaft insertion hole 19 between the throttle flow path 1 and the EGR flow path 2, and the second bearing 12 is press-fitted into the shaft driving end side. It is incorporated into the hole 19.

Even if it provides in this way, the throttle valve body 5 fixed to the front-end | tip part of the shaft 4 will remain in the state which is easy to vibrate in the cantilever state.
Therefore, in the first embodiment, a rubber elastic body 22 that is elastically deformable is provided between the first bearing 11 on the side close to the tip end portion of the shaft 4 and the shaft 4.
Thus, by providing the elastic body 22 between the first bearing 11 and the shaft 4, the elastic body 22 can absorb the vibration of the throttle valve body 5 that is in a state of being easily vibrated in a cantilever state. it can.

Further, the first bearing 11 on the side close to the tip of the shaft 4 in the first embodiment is press-fitted and fixed in the shaft insertion hole 19 of the throttle body 3.
For this reason, by providing the elastic body 22 between the first bearing 11 and the shaft 4, the assembly clearance between the first bearing 11 and the shaft 4 is absorbed by the elastic body 22, and the shaft 4 does not rattle. Can be prevented.

(Assembly procedure of Example 1)
(1) The first bearing 11 is press-fitted into the shaft insertion hole 19 between the throttle channel 1 and the EGR channel 2.
(2) The EGR valve body 6 is inserted into the EGR flow path 2.
(3) The shaft 4 into which the second bearing 12 is press-fitted and the O-ring 18 and the elastic body 22 are attached is inserted into the shaft insertion hole 19 of the throttle body 3. At this time, the shaft 4 is passed through the shaft through hole 15 of the EGR valve body 6 disposed in the EGR flow path 2.
(4) The EGR valve body 6 is fixed to the shaft 4 using the screw 16.
(5) The end of the shaft fixing hole 17 formed in the throttle valve body 5 is fitted to the tip of the shaft 4, and the gap between the shaft 4 and the shaft fixing hole 17 is closed by the O-ring 18. (6) The resin 21 is filled in the gap between the throttle valve body 5 and the shaft 4, the resin 21 is cured, and the throttle valve body 5 is fixed to the tip portion of the shaft 4.

[Effect of Example 1]
As described above, the EGR integrated throttle device of the first embodiment connects the EGR flow path 2 at an acute angle with respect to the intake upstream side of the throttle flow path 1 (V-shaped connection). The bending of the flow path in the downstream portion of the path 2 is reduced, and the flow path resistance can be reduced. This can prevent a decrease in the EGR amount.
Further, since the EGR flow path 2 is connected at an acute angle with respect to the intake upstream side of the throttle flow path 1 (V-shaped connection), the intake air flowing through the throttle flow path 1 is disturbed at the outlet portion of the EGR flow path 2. The number of malfunctions is reduced and the increase in intake resistance is suppressed. Thereby, it is possible to prevent a decrease in engine output.
Further, since the EGR flow path 2 is inclined at an acute angle with respect to the intake upstream side of the throttle flow path 1 (V-shaped connection), the shaft 4 is provided obliquely with respect to the throttle flow path 1. By adopting a structure in which the throttle valve body 5 is attached to the tip portion of the shaft 4, the throttle valve body 5 can be easily assembled.

A second embodiment will be described with reference to FIG. In the following embodiments, the same reference numerals as those in the first embodiment denote the same functional objects.
[Feature Technology 1 of Example 2]
In the first embodiment, the example in which the EGR valve body 6 is fixed to the shaft 4 with the screw 16 is shown.
On the other hand, in the second embodiment, the EGR valve body 6 is fixed to the shaft 4 by rivets (not shown).

[Feature Technique 2 of Example 2]
In the first embodiment, the example in which the first bearing 11 rotatably supports the tip portion of the shaft 4 has been described.
On the other hand, in the second embodiment, the first bearing 11 rotatably supports the root portion of the throttle valve body 5 (the connection portion on the side connected to the tip end portion of the shaft 4 in the throttle valve body 5). is there. Specifically, as shown in FIG. 2, the first bearing 11 is provided so that the throttle valve body 5 is fixed to the distal end portion of the shaft 4 in a state where it is press-fitted into the outer periphery of the root portion of the throttle valve body 5. ing.

[Feature Technology 3 of Example 2]
In the first embodiment, the example in which the elastic body 22 is interposed between the first bearing 11 and the tip portion of the shaft 4 has been described.
In contrast, in the second embodiment, the elastic body 22 is interposed between the first bearing 11 and the throttle body 3.
Thus, by providing the elastic body 22 between the first bearing 11 and the throttle body 3, the elastic body 22 absorbs the vibration of the throttle valve body 5 that is in a state of being easily vibrated in a cantilever state. Can do.

Further, the first bearing 11 of the second embodiment is press-fitted and fixed in the shaft insertion hole 19 of the throttle body 3 while being press-fitted into the root portion of the throttle valve body 5.
For this reason, by providing the elastic body 22 between the first bearing 11 and the throttle body 3, the assembly clearance between the outer periphery of the first bearing 11 and the throttle body 3 can be absorbed by the elastic body 22. it can.

(Assembly procedure of Example 2)
(1) The EGR valve body 6 is inserted into the EGR flow path 2.
(2) The shaft 4 into which the second bearing 12 is press-fitted and the O-ring 18 is attached is inserted into the shaft insertion hole 19 of the throttle body 3. At this time, the shaft 4 is passed through the shaft through hole 15 of the EGR valve body 6 disposed in the EGR flow path 2.
(3) The EGR valve body 6 is fixed to the shaft 4 using a rivet (not shown).
(4) The first bearing 11 is press-fitted into the throttle valve body 5, and the elastic body 22 is mounted on the outer periphery of the first bearing 11.
(5) The end of the shaft fixing hole 17 formed in the throttle valve body 5 is fitted to the tip of the shaft 4, and the gap between the shaft 4 and the shaft fixing hole 17 is closed by the O-ring 18. (6) Filling the gap between the throttle valve body 5 and the shaft 4 with the resin 21 and curing the resin 21, the throttle valve body 5 is fixed to the tip of the shaft 4.

A third embodiment will be described with reference to FIG. FIG. 3 does not disclose the first bearing 11 and the elastic body 22 in the drawing in order to disclose the joint portion of the shaft 4 and the throttle valve body 5. It is provided similarly.
In the first embodiment, the example in which the throttle valve body 5 is fixed to the tip end portion of the shaft 4 by filling the resin 21 in the gap between the throttle valve body 5 and the shaft 4 and curing the resin 21 is shown. .
On the other hand, in the third embodiment, the throttle valve body 5 is fixed to the tip portion of the shaft 4 by the rivet 23.
Specifically, a slit groove is formed at the tip of the shaft 4 of the third embodiment as shown in FIG. 3, and a plate-like convex portion that fits into the slit groove is formed on the throttle valve body 5. Then, the plate-like convex portion of the throttle valve body 5 is fitted into the slit groove at the tip portion of the shaft 4, and the rivet 23 is inserted into the fitted slit groove and the plate-like convex portion, and the rivet 23 is caulked. A throttle valve body 5 is fixed to the tip of the shaft 4.

As described above, when the throttle valve body 5 is fixed to the tip end portion of the shaft 4 using the rivet 23, a caulking force applying hole 24 for inserting a caulking tool for applying a caulking force to the rivet 23 into the throttle body 3. It is necessary to provide.
The caulking force imparting hole 24 is for closing the plug 25 after the rivet 23 is caulked.

(Assembly procedure of Example 3)
(1) The first bearing 11 is press-fitted into the shaft insertion hole 19 between the throttle channel 1 and the EGR channel 2.
(2) The EGR valve body 6 is inserted into the EGR flow path 2.
(3) The shaft 4 into which the second bearing 12 is press-fitted and the elastic body 22 is mounted is inserted into the shaft insertion hole 19 of the throttle body 3. At this time, the shaft 4 is passed through the shaft through hole 15 of the EGR valve body 6 disposed in the EGR flow path 2.
(4) The EGR valve body 6 is fixed to the shaft 4 using the screw 16.
The above (1) to (4) are the same as those in the first embodiment except that the O-ring 18 is not used.
(5) The plate-like convex portion of the throttle valve body 5 is fitted into the slit groove at the front end portion of the shaft 4, and the throttle valve body 5 is fixed to the front end portion of the shaft 4 by the rivet 23.
(6) The plug 25 is press-fitted into the caulking force application hole 24 formed in the throttle body 3 to close the caulking force application hole 24.

[Modification]
In the above embodiment, an example in which the throttle valve body 5 is fixed to the tip portion of the shaft 4 and the EGR valve body 6 is fixed to the middle portion of the shaft 4 is shown. The relationship between the EGR flow path 2 and the EGR valve body 6 may be reversed so that the EGR valve body 6 is fixed to the tip portion of the shaft 4 and the throttle valve body 5 is fixed to the middle portion of the shaft 4. .
In the above embodiment, the shaft driving end is driven by the electric actuator 7, but the driving means of the shaft 4 is not limited, and may be driven in conjunction with, for example, an accelerator pedal.

(Example 1) which is sectional drawing of an EGR integrated throttle apparatus. (Example 2) which is explanatory drawing of the throttle valve body assembled | attached to the front-end | tip part of a shaft. (Example 3) which is explanatory drawing of the throttle valve body assembled | attached to the front-end | tip part of a shaft. It is the schematic of a PCV integrated throttle device (conventional example). It is a schematic diagram of an EGR integrated throttle device (example of subject).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throttle flow path 2 EGR flow path 3 Throttle body 4 Shaft 5 Throttle valve body 6 EGR valve body 11 1st bearing (bearing of the front-end | tip part side of a shaft)
21 Resin (Resin filled in the gap between the valve body and the shaft)
22 Elastic body 23 Rivet (Rivet that fixes the throttle valve body to the tip of the shaft)
24 Caulking force imparting hole 25 Plug

Claims (7)

A throttle flow path that forms part of the intake pipe of the internal combustion engine;
A throttle valve body for adjusting the opening of the throttle flow path;
An EGR passage connected to the throttle passage in an EGR pipe connecting the intake downstream side of the throttle valve body and an exhaust pipe;
An EGR valve body for adjusting the opening of the EGR flow path;
A shaft that coaxially arranges the throttle valve body and the EGR valve body to drive integrally,
In the EGR integrated throttle device in which the throttle flow path and the EGR flow path are formed in a common throttle body,
The EGR flow path is connected at an acute angle with respect to the intake upstream side of the throttle flow path,
The shaft penetrates the EGR flow path and crosses the shaft, the shaft is inclined with respect to the throttle flow path, and the front end of the shaft passes through the throttle flow path without crossing the throttle flow path. Provided to transmit rotational torque inside the flow path,
The EGR valve body is fixed to an intermediate portion of the shaft in the EGR flow path,
The throttle valve body is an EGR integrated throttle device, wherein the throttle valve body is fixed to a tip portion of the shaft in an inclined state with respect to an axis of the shaft in the throttle flow path. A throttle flow path that forms part of the intake pipe of the internal combustion engine;
A throttle valve body for adjusting the opening of the throttle flow path;
An EGR passage connected to the throttle passage in an EGR pipe connecting the intake downstream side of the throttle valve body and an exhaust pipe;
An EGR valve body for adjusting the opening of the EGR flow path;
A shaft that coaxially arranges the throttle valve body and the EGR valve body to drive integrally,
In the EGR integrated throttle device in which the throttle flow path and the EGR flow path are formed in a common throttle body,
The EGR flow path is connected at an acute angle with respect to the intake upstream side of the throttle flow path,
The shaft penetrates through the throttle channel and crosses the shaft, the shaft is inclined with respect to the EGR channel, and the tip of the shaft passes through the EGR channel without crossing the EGR channel. Provided to transmit rotational torque inside the flow path, and the throttle valve body is fixed to an intermediate portion of the shaft in the throttle flow path,
The EGR integrated throttle device, wherein the EGR valve body is fixed to a tip portion of the shaft in an inclined state with respect to the shaft axis in the EGR flow path. In the EGR integrated throttle device according to claim 1 or 2,
The bearing on the tip end side of the shaft includes an elastic body that can be elastically deformed between the shaft inserted into the bearing or the throttle body that supports the outer periphery of the bearing. EGR integrated throttle device. In the EGR integrated throttle device according to claim 3,
The outer periphery of the bearing is press-fitted and fixed to the throttle body,
The EGR integrated throttle device according to claim 1, wherein the elastic body is provided between the shaft on the tip end side of the shaft and the shaft. In the EGR integrated throttle device according to claim 3,
The bearing is press-fitted into the outer periphery of the shaft or the outer periphery of the throttle valve body or the EGR valve body fixed to the tip of the shaft,
The EGR integrated throttle device according to claim 1, wherein the elastic body is provided between a bearing on a tip end side of the shaft and the throttle body. In the EGR integrated throttle device according to any one of claims 1 to 5,
The throttle valve body or the EGR valve body fixed to the tip end portion of the shaft is fixed to the shaft by curing after filling a resin between the valve body and the shaft. EGR integrated throttle device. In the EGR integrated throttle device according to any one of claims 1 to 5,
The throttle valve body or the EGR valve body fixed to the tip portion of the shaft is fixed to the shaft using a rivet,
The EGR integrated throttle device, wherein the throttle body is provided with a plug for closing a caulking force applying hole for applying a caulking force to the rivet from the outside of the throttle body.

Images