JPS609377Y2 - Arm mounting structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of mounting the arm.

For example, to attach an arm that connects the tip of the arm to the head of a movable pin with one touch, the structure is such that a spherical head is formed at the end of the movable pin, and one end of the arm has a side that can receive this spherical head. An elastic cylindrical member having a cylindrical through hole extending in the direction of the arm and a split slit extending in the longitudinal direction of the arm is fitted onto one end of the arm, and the enlarged circular opening formed in the center of the split slit is inserted into the arm. The spherical head of the pin is aligned with the cylindrical through hole of the arm, and the enlarged circular opening is pushed out while the spherical head of the pin is fitted into the cylindrical through hole of the arm, thereby fixing the tip of the arm to the pin head. The structure of the arm attachment is known.

This method of attaching the arm cannot be applied, for example, when the arm is attached to the head of the rotating shaft and the arm is intended to rotate the rotating shaft, since the arm can freely rotate relative to the movable pin.

The object of the present invention is to improve the conventional arm attachment structure and provide an arm attachment structure that allows the rotation shaft to be rotated by an arm that is attached to the rotation shaft head with one touch.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, a case will be described in which the present invention is applied to a rotary valve for controlling a flow path of a helical intake port.

Referring to FIG. 1, 1 is a cylinder block, 2 is a piston, 3 is a cylinder head, 4 is a combustion chamber, 5 is an intake valve,
Reference numeral 6 indicates helical intake ports formed within the cylinder head 3, respectively.

2 to 4 schematically show the shape of the helical intake port 6 shown in FIG. 1.

As shown in FIG. 3, this helical intake port 6 is composed of an inlet passage section A in which the flow path axis a is slightly curved, and a spiral section B formed around the valve axis of the intake valve 5.
The inlet passage section A is tangentially connected to the spiral section B.

On the other hand, referring to FIGS. 1 to 4, the cylinder head 3
A branch passage 14 of substantially uniform cross section is formed within the inlet passage A, and this branch passage 14 is connected to the spiral end C.

An inlet opening 15 of the branch passage 14 is formed on the side wall surface 9 in the vicinity of the inlet opening of the inlet passage section A, and an outlet opening 16 of the branch passage 14 is formed on the upper end of the side wall surface 12 at the spiral end C.

Further, an on-off valve insertion hole 17 is bored in the cylinder head 3 and extends through the branch passage 14.
Rotary valves 18 configuring opening/closing valves are inserted into each of the openings 7 .

Referring to FIG. 5, the on-off valve insertion hole 17 consists of a cylindrical hole of uniform diameter drilled from above in the cylinder head 3, and this on-off valve insertion hole 17 extends beyond the lower wall surface of the branch passage 14. Extends to a certain extent.

Therefore, a groove 19 is formed on the lower wall surface of the branch passage 14 by the opening/closing valve insertion hole 17.

Further, an internal thread 20 is screwed onto the upper end of the on-off valve insertion hole 17, and a rotary valve holder 21 is screwed onto this internal thread 20.

The rotary valve holder 21 has an outer peripheral flange 22 on its outer peripheral wall surface, and the outer peripheral flange 22 and the cylinder head 3
A sealing member 23 is inserted between them.

On the other hand, a through hole 24 is bored in the rotary valve holder 21, and a valve shaft 25 of the rotary valve 18 is rotatably inserted into the through hole 24.

A thin plate-shaped valve body 26 is fixed to the lower end of the valve shaft 25, and an arm 27 is attached to the upper end of the valve shaft 25.

A ring groove 30 is formed on the outer peripheral wall surface of the valve shaft 25 at approximately the same height as the upper end surface of the rotary valve holder 21.
A C-shaped positioning ring 31 as shown in FIG. 7 is fitted into the ring groove 30. As shown in FIG.

This positioning ring 31 engages with a conical surface 32 formed on the inner edge of the upper end surface of the rotary valve holder 21 to position the valve body 26 at a predetermined position.

On the other hand, a sealing member 34 surrounded by a reinforcing frame 33 is fitted into the upper end of the rotary valve holder 21, and a sealing portion 34a of the sealing member 34 is closed by an elastic ring 35 inserted on the outer peripheral surface of the sealing member 34. It is pressed onto the outer peripheral surface of the shaft 25.

The branch 14 is therefore completely isolated from the outside air by the sealing elements 23,34.

As shown in FIG. 5, one end of the arm 27 is connected to the valve shaft 25.
The other end of the arm 27 is connected to an actuator (not shown) that responds to the engine intake air amount, for example.

During low-speed, low-load operation of the engine with a small amount of intake air, the valve body 26 of the rotary valve 18 closes the branch passage 14, so that the air flowing into the helical intake port 6 at this time flows from the inlet passage A to the spiral part. In order to flow into B, a strong swirling flow is generated in the combustion chamber 4.

On the other hand, when the engine is operated at high speed and under high load with a large amount of intake air, the actuator operates to rotate the arm 27 around the valve shaft 25, and accordingly, the valve shaft 25 is rotated and the valve body 26 fully opens the branch passage 14. do.

As a result, a portion of the intake air sent into the inlet passage section A flows into the spiral section B via the branch passage 14 with low flow resistance, so that high filling efficiency can be ensured.

Figures 8 to 16 show the valve shaft 2 of the rotary valve 18 in Figure 5.
5 shows a structure for attaching the arm 27 to the head of the device.

As shown in FIG. 8, a spherical head 40 is formed at the upper end of the valve stem 25, and an elongated groove 41 extending laterally is formed at the top of the spherical head 40.

On the other hand, a U-shaped rotation prevention plate 42 as shown in FIG. 9 is fitted into the elongated groove 41 of the spherical head 40 as shown in FIG.

As shown in FIGS. 9 and 10, the rotation prevention plate 42
The middle part of the rotation prevention plate 4 is fitted into the elongated groove 41.
Both ends of the spherical head 40 have leg portions 42a that protrude from the spherical head 40 and extend downward.

On the other hand, as shown in FIG. 11, the arm 27 having a circular cross section is formed with a cylindrical through hole 43 extending laterally and capable of receiving the spherical head 40. A pair of recesses 444 capable of receiving the protruding end of the rotation prevention valve 42
, 45 are formed.

As can be seen from FIG. 11, these grooves 44, 45 are arranged on the longitudinal axis of the arm 27, and the groove 45 is formed in the form of a gap.

An elastic cylindrical member 46 as shown in FIG. 13 is fitted onto the arm 27 as shown in FIG. 15.

As shown in FIGS. 13 and 14, this elastic cylindrical member 46 has a thin hollow cylindrical base 46a, and a dividing slit 47 extending in the longitudinal direction is provided on the outer peripheral surface of the hollow cylindrical base 46a. It is formed.

Further, an enlarged circular opening 48 is formed in the center of this divided slit 47, and the diameter of the enlarged circular opening 48 is equal to that of the spherical head 40.
It is formed smaller than the diameter of.

Note that these dividing slits 47 and enlarged circular openings 48
is formed between flanges 49 and 50 rising from the outer peripheral surface of the hollow cylindrical base 46a.

This resilient cylindrical member 46 has its enlarged circular opening 48 aligned with the cylindrical through hole 43 of the arm 27, and the dividing slit 47
is fitted onto the outer peripheral surface of the arm 27 so as to be aligned with the grooves 44 and 45 of the arm 27.

Next, as shown in FIG. 10, the flange 49.5 of the resilient cylindrical member 46 is attached to the spherical head 40 fitted with the rotation prevention plate 42.
Insert the enlarged circular opening 48 while pushing out the 16th
As shown in the figure, the spherical head 40 is fitted into the cylindrical through hole 43 of the arm 27, and the protruding end of the rotation prevention plate 42 is fitted into the grooves 44, 45 of the arm 27.

At this time, the flange 49,50 of the resilient tubular member 46 returns to its original position due to its own resilience, thereby fixing the arm 27 to the spherical head 40 of the valve stem 25.

Furthermore, at this time, as mentioned above, the concave groove 44°4 of the arm 27
5 fits into the protruding end of the rotation prevention plate 42, so that the arm 2
7 is fixed non-rotatably to the valve shaft 25.

As described above, according to the present invention, by simply pushing the arm into the head of the valve stem, the arm can be fixed to the head of the valve stem in a non-rotatable manner with a single touch.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the internal combustion engine, Fig. 2 is a perspective view showing the shape of the helical intake port, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is a view along the branching path of Fig. 3. 5 is a side sectional view of the rotary valve; FIG. 6 is a side view of FIG. 5; FIG. 7 is a plan view of the C-shaped ring of FIG. 5;
The figure is a side view of the valve stem head, and Figure 9 is a front view of the rotation prevention plate.
Fig. 10 is a side view showing the valve shaft head with the rotation prevention plate attached, Fig. 11 is a plan view of the end of the arm, Fig. 12 is a side view of Fig. 11, and Fig. 13 is the elasticity A plan view of the cylindrical member, FIG. 14 is a side view of FIG. 13, and FIG. 15 is a plan view showing the elastic cylindrical member attached to the end of the arm.
FIG. 6 is a side view showing the arm attached to the valve shaft. 25... Valve stem, 27... Arm, 40
・Curved/spherical head, 41...Elongated groove, 42...
... Rotation prevention plate, 43 ... Cylindrical through hole, 4
4, 45, groove, 47...divided slit,
48... Enlarged circular aperture.

Claims (1)

[Scope of utility model registration request] A spherical head is formed at the end of the rotating shaft, a cylindrical through hole extending in the transverse direction capable of receiving the spherical head is formed at one end of the arm to be fixed to the rotating shaft end, and the arm is fixed to the rotating shaft. An elastic cylindrical member formed with a longitudinally extending split slit is fitted onto one end of the arm, and an enlarged circular opening formed at the center of the split slit is aligned with the cylindrical through hole.1. The arm is attached in a structure in which the spherical head of the rotating shaft is fitted into the cylindrical through hole of the arm while pushing out the enlarged circular opening, and the top of the spherical head formed at the end of the rotating shaft is A slender groove extending in the lateral direction is formed in the slender groove, and a rotation prevention plate is fitted into the slender groove and protrudes laterally from both ends of the cylindrical through hole of the arm. The arm is mounted with a concave groove that can receive the protruding end.