JPH03229070A - Rotary valve unit with clearance adjusting layer - Google Patents

Abstract

PURPOSE:To cut a clearance adjusting layer and make a clearance with a housing come into a state of being almost noting by forming this clearance adjusting layer in a sliding-contact part with a rotor by means of fluororesin coating, and rotating this rotor. CONSTITUTION:A clearance adjusting layer 11A is formed on the outer circumference of a sliding-contact part with a housing 14 of a rotor 11 by means of fluororesin coating. This adjusting layer 11A is formed so as to make an outer diameter of the rotor 11 equal to an inner diameter of the housing 14 or a little larger than it. When the rotor 11 is driven into rotation, the adjusting layer 11A of the rotor 11 is cut by an bent edge of the housing 14, and the sliding-contact part between the rotor 11 and the housing 14 is adjusted is adjusted of its clearance into a state of being almost noting. In this connection, cutting and adjustment can be done by the rotor 11 alone. Incidentally, each edge part 12B may be formed in edge parts 14B for cutting and each rotational side edge at both ends of a rotor butterfly 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a rotary valve suitable for being installed in the intake passage of an engine such as an automobile engine in order to control the timing of intake air into a combustion chamber. The present invention relates to a device, and particularly to a rotary valve device with a clearance adjustment layer that can adjust the clearance between a rotor side and a housing side.

[Prior art] A rotary valve is installed in the intake passage of an engine, and the rotary valve is opened and closed at appropriate timing in synchronization with the opening and closing timing of the intake valve (poppet valve), thereby adjusting the actual intake timing into the combustion chamber. Technology has been developed to reduce pumping losses and increase the efficiency of engine combustion by controlling this.

Figures 5 to 7 show conventional examples of such intake control rotary valve devices. Figure 5 is a sectional plan view of an automobile engine equipped with a conventional rotary valve device, and Figure 6 is a side sectional view thereof. FIG. 7 is a schematic diagram showing a longitudinal section of the main part of the rotary valve.

As shown in Fig. 5.6, an intake manifold (intake passage) 3 is led from the surge tank to each cylinder 28 to 2d of the four-cylinder engine 1, and an intake manifold (intake passage) 3 is led from the surge tank to each cylinder 28 to 2d of the four-cylinder engine 1. A rotary valve 4 is provided to intersect the intake manifold 3.

In Fig. 5.6, reference numeral 1b is the cylinder block of the engine 1, IA is the combustion chamber, 5 is the intake valve, 6 is the exhaust valve, and 7 is the cylinder block of the engine 1.
1 is an exhaust manifold (exhaust passage), and 10 is a crankshaft.

By the way, as shown in FIG. 7, the rotary valve 4 is provided with a rotor 11 that is inserted into and pivotally supported by a housing 14, and the intake manifolds 38 to 3 of the rotor 11
d (that is, the inflow hole 13 of the housing 14
a and the outflow hole 13b), a flow path 13 is provided with a phase shift for each cylinder. Furthermore, in the center of the flow path 13.

A rotor butterfly 12 as a valve body is provided integrally with the rotor 11, and this rotor butterfly 1
2, the flow path 13 between the inflow hole 13a and the outflow hole] 3b
It is configured so that it can be opened and closed.

[Problem to be solved by the invention] In such a conventional rotary valve device, the rotor 11
The outer periphery and the housing 14 and both radial ends of the rotor butterfly 2 and the housing 14 are in sliding contact.

If the clearance of this sliding contact portion is too large, air leakage will increase, making idling operation impossible; if it is too small, friction will increase with high-speed rotation.

For this reason, it is necessary to keep the clearance of the sliding contact portion within a required range, but providing such clearance requires high finishing accuracy, resulting in high costs.

The present invention was proposed in view of such problems, and an object of the present invention is to provide a rotary valve device with a clearance adjustment layer that allows the clearance of the sliding contact portion to be set to a desired state at low cost. .

[Means for Solving the Problems] Therefore, the rotary valve device with a clearance adjustment layer of the present invention includes a housing, an inflow hole and an outflow hole formed in the housing, and a rotor that is inserted and pivotally connected to the housing. and a valve body provided at a predetermined position of the rotor to open and close a flow path between the inflow hole and the outflow hole, the portion where the rotor and the housing come into sliding contact. A clearance adjustment layer is provided on at least one of the sliding contact portion of the rotor and the sliding contact portion of the housing, which is cut as the rotor rotates relative to the other and automatically adjusts the clearance between the rotor and the housing. It is characterized by the presence of

[Function] In the rotary valve device with a clearance adjustment layer of the present invention described in ``--, when the rotor and the housing rotate relative to each other in the initial stage of use, the clearance adjustment layer in the sliding portion is cut, and the clearance becomes O (approximately When the state is reached, steady operation is carried out.

After this, operation is always performed with the clearance at O.

[Example] An example of the present invention will be described below with reference to one drawing.
1.2 shows a rotary valve device with a clearance adjustment layer as a first embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view schematically showing the main parts thereof corresponding to FIG. 7,
FIG. 2 is a longitudinal cross-sectional view showing a modification thereof corresponding to FIG. 1, and FIG. 3.4 shows a rotary valve device with a clearance adjustment layer as a second embodiment of the present invention.
Figure 3 is a longitudinal sectional view showing the main parts corresponding to Figure 1;
FIG. 4 is a longitudinal cross-sectional view showing a modified example corresponding to FIG. 1.

First, a first embodiment of the present invention will be described. Except for the contact portion between the rotor 11 and the housing 14 in this embodiment, the structure is the same as that of the conventional example shown in FIGS. 5 to 7.
As shown in FIGS. 5 to 7, a rotary valve 4 is provided in the cylinder head portion 1a of the engine 1 so as to intersect with the intake manifold 3. As shown in FIGS.

The rotary valve 4 has an inflow hole 13 as shown in FIG.
a and an outflow hole 13b, and a rotor 11 inserted and pivotally supported in this housing 14. and the outflow hole 13b), a flow path 13 is provided with a phase shift for each cylinder.

A rotor butterfly 12 as a valve body provided integrally with the rotor 11 is provided in the center of the flow path 13, and the rotor butterfly 12 opens the flow path 13 between the inflow hole 13a and the outflow hole 13b. It is configured so that it can be closed appropriately in cooperation with the housing 14.

Then, both end edges of the rotor butterfly 12 are connected to the housing 1.
4, the inflow hole 13a side and the outflow hole 13b side
the flow path 13A and the flow path on both sides of the rotor butterfly 12], 3
B is set to close.

In particular, a certain clearance is ensured between the sliding contact portion between the outer periphery of the rotor 11 and the housing 14, and the sliding contact portion between both radial ends of the rotor butterfly 12 and the housing 14.

In this example, a fluororesin coating is applied to the outer periphery of the portion of the rotor 11 that contacts the housing 14 to form a clearance adjustment layer 11A.

This fluororesin coating is applied so that the outer diameter of the rotor 1 and the inner diameter of the housing 14 are approximately the same, or the outer diameter of the rotor 11 is slightly larger than the inner diameter of the housing 14. ing.

With such a configuration, in this embodiment, when the rotor 11 is rotationally driven at the initial stage of use of the rotary valve device (during assembly adjustment), the rotor 11 rotates relative to the housing 14, and the clearance adjustment layer 1 of the rotor 11 rotates. .1A is cut by the bent twill portion of the housing 14.

As a result, the clearance of the sliding contact portion between the rotor 11 and the housing 14 is automatically adjusted to O or approximately O by operation of the device.

In this way, the clearance between the rotor 11 and the housing 14 is easily adjusted to 0 (including the gap O), so the airtightness of the flow path 13 is sufficiently ensured, and the rotor 11 can rotate at high speed. Even if this is done, the engine can be operated with low friction, and the actual intake timing can be controlled without wasting the cantering torque of the engine 1.

Next, a modification of this embodiment will be described. As shown in FIG.
．． 4. A is formed.

Since this modification is configured in this way, the rotor 1]
When rotated, the clearance adjustment layer 1 of the housing 14
4A is cut by the rotor 11, and the clearance of the sliding contact portion is adjusted to the state of O.

As a result, the same operation as in the first embodiment is performed.

Next, the second embodiment of the present invention will be explained.
As shown in the figure, the structure is almost the same as that of the first embodiment described above, and in addition, an edge portion 14B for cutting the clearance adjustment U layer 11A of the rotor 11 is provided at the bent portion of the housing 14. ing.

The edge portion 14B is one of the bent edges of the housing 14.
From the flow path 13 along the rotational direction of the rotor 11 to the bent portion 14C
It is provided in the portion leading to the rotor 11 so that the outer periphery of the rotor 11 can be cut without any trouble.

Here, the edge portion 14B is provided by forming the edge of the housing 14 sharply, but a cutter or the like formed of a material different from that of the housing 14 may be attached as the edge portion 14B. .

Since this embodiment is configured as described above, the rotor 1]
With the rotation of the clearance adjustment layer], the edge portion 14B of the housing 14 easily and reliably cuts the IA. That is, when the outer diameter of the rotor 11 is formed larger than the inner diameter of the housing 14, or when the clearance adjustment/W1.
If the clearance adjustment layer 11A cannot be scraped off, such as when the clearance adjustment layer 11A is formed in a distorted state, there is a risk of increasing the loss of recording torque.
By providing B, the above-mentioned problems are reliably solved.

Furthermore, to explain a modification of the second embodiment, the fourth
As shown in the figure, in addition to the structure of the modified example of the first embodiment shown in FIG.
Edge portions 12B are formed at both ends in the rotational direction side edges.

Since this modification is configured in this way, the rotor 11
When rotated, the clearance adjustment layer 14A of the housing 14 is easily and reliably cut by the edge portion 12B of the rotor 11.

As a result, the same operation as in the second embodiment is performed.

Note that the material of the coating layer forming the clearance adjustment layer 11A is not limited to fluororesin.
Any other material may be used as long as it can form a smooth sliding surface and can be cut.

[Effects of the Invention] As described in detail above, the rotary valve device with a clearance adjustment layer of the present invention includes a housing, an inflow hole and an outflow hole formed in the housing, and A rotary valve device comprising a rotor and a valve body provided at a predetermined position of the rotor to open and close a flow path between the inflow hole and the outflow hole, wherein the rotor and the housing slide together. At least one of the sliding contact portion of the rotor and the sliding contact portion of the housing in the contact portion is provided with a clearance adjustment layer that is cut as the rotor rotates relative to the other and automatically adjusts the clearance between the rotor and the housing. With the simple configuration of
There is an advantage that a rotary valve device can be manufactured at a low cost, without air leakage, and which can operate with low friction even when the rotor rotates at high speed.

Furthermore, when this device is employed in an engine, air leakage can be reliably prevented, so there is an advantage that idling operation can be performed reliably.

Furthermore, when an edge portion is provided on the member on which the clearance adjustment layer is to be shaved, there is an advantage that the clearance adjustment layer can be formed without any problem even when the clearance adjustment layer is formed in a distorted state.

[Brief explanation of drawings]

1.2 shows a rotary valve device with a clearance adjustment layer as a first embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view schematically showing the main parts thereof corresponding to FIG. 7,
FIG. 2 is a longitudinal cross-sectional view showing a modification thereof corresponding to FIG. 1, and FIG. 3.4 shows a rotary valve device with a clearance adjustment layer as a second embodiment of the present invention.
FIG. 3 is a longitudinal cross-sectional view showing the main parts corresponding to FIG. 1. Fig. 4 is a vertical cross-sectional view showing a modified example corresponding to Fig. 1, Figs. FIG. 6 is a plan view sectional view of the automobile engine, FIG. 6 is a side sectional view thereof, and FIG. 7 is a schematic diagram showing a vertical sectional view of the main part of the rotary valve. 1...-Engine, IA-Combustion chamber, 1a-Cylinder head portion, 1b...-Cylinder block, 28-2d-...
- Cylinder, 3,38~3cl - Intake manifold, 4...Rotary valve, 5-Intake valve, 6-Exhaust valve, 7-Nikizost manifold, 10-Crankshaft, 11-Rotor, 11A-... Clearance adjustment layer, 1
2-rotor butterfly, 12B-edge portion, 13-flow path, 13a-inflow hole, 13b-outflow hole, 14...-housing, 14A-clearance adjustment layer, 14B...-
Edge part, 14C-bent part.

Claims (1)

[Claims] A housing, an inflow hole and an outflow hole formed in the housing, a rotor inserted and pivotally mounted in the housing, and a predetermined hole of the rotor to open and close a flow path between the inflow hole and the outflow hole. In a rotary valve device equipped with a valve body provided at a position, at least one of the sliding contact portion of the rotor and the sliding contact portion of the housing in a portion where the rotor and the housing make sliding contact is provided with a rotation relative to the other. 1. A rotary valve device with a clearance adjustment layer, comprising a clearance adjustment layer that is cut as the rotor moves and automatically adjusts the clearance between the rotor and the housing.