JPS61234212A - Tappet valve device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To increase an opening area per unit time of a valve and improve its sealing property or the like, by providing a rotary valve in an intake and an exhaust port provided in a cylinder head and intermittently further rapidly opening and closing each valve by a Geneva gear. CONSTITUTION:A device provides rotary valves 10 and 20 respectively in an intake port 7 and an exhaust port 8 which are provided in a cylinder head. The device, having gears 35, 37 equipped with four fitting grooves 35a, 37a in valve shafts 34, 36 of each valve, drives each gear 35,37 engaging with a gear 33, with pins 33a-d, fixed to a shaft 31 rotated by a gear 32 driven by an engine crankshaft. If the gear 33 rotates at an equal speed in accordance with rotation of an engine, the intake valve 10 acts rapidly opening when the pin 33a engages with the groove 35a of the gear 35 while rapidly closing when the pin 33b engages. Similarly, the exhaust valve 20 opens when the pin 33c, provided in the gear 33, engages with the groove 37a of the gear 37 while closes when the pin 33d engages.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a valve train for an internal combustion engine.

(Prior Art and Its Problems) Poppet valves, which are used in valve systems of general internal combustion engines, are currently employed in most internal combustion engines because of their good sealing properties.

However, when poppet valves are used to further improve the performance of an internal combustion engine, a burnt exhaust valve appears in the combustion chamber, promoting the occurrence of explosion (detonation) and early ignition (preignition). The presence of the shaft and valve head in the opening causes ventilation resistance and impairs the suction and exhaust efficiency; the presence of the valve shaft and valve head causes the intake and exhaust passage to be curved near the valve, impairing the suction and exhaust efficiency; Since the valve stem makes reciprocating motion, it requires a long space in the direction of movement, making the engine large, and since the valve opens and closes through reciprocating motion, it produces impact noise when seating (closing), etc. There is.

Therefore, in order to eliminate the drawbacks of poppet valves, many sleeve valves and rotary valves have been proposed.In particular, rotary valves (sliding valves) such as ball valves, cylindrical valves, conical valves, and disc valves have been proposed.
is being studied.

However, in the currently proposed system of rotary valves (sliding valves), all parts are given continuous rotational motion to avoid reciprocating motion, and even in the event of an explosion, the valve body rotates while receiving the explosive force. Due to the moving structure, it is impossible to reconcile the contradictory conditions of increased friction and incomplete sealing, and due to the structure of the system,
Since the valve body continues to rotate during intake and exhaust, it is not possible to obtain an effective opening time. If this happens, there are problems such as spread loss in the suction and exhaust ports, impairing the suction and exhaust efficiency, and this has hindered its practical use.

(Object of the Invention) The present invention has been made in view of the above-mentioned points, and is made by driving the valve body of a rotary valve intermittently in one direction so that it remains motionless (stopped) when the valve is opened.
By making the valve immobile (stopped) during an explosion, the purpose is to increase the opening area per unit time when opening the valve, improve sealing performance during an explosion, and reduce friction.

(Summary of the Invention) In order to achieve the above-mentioned object, in the present invention, the suction and exhaust passages communicating with the combustion chamber of an internal combustion engine are respectively disposed separately, and a sliding surface that closes each of these passages and an opening are provided. A sliding valve comprising a spherical valve body having a through hole, a valve seat that slides in contact with the valve body and rotatably supports the valve body, and each sliding valve is linked to the movement of a piston of the engine. a valve mechanism having an intermittent function that opens and closes each valve body for a predetermined period of time, and stops the movement of the valve body for a predetermined period during each opening and closing period; and a drive shaft for each of the valve bodies and the valve mechanism. The present invention provides a valve operating system for an internal combustion engine, including a connecting member that connects the valve train and the valve train.

(Example of the invention) An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the main parts of an internal combustion engine to which a valve train according to the present invention is applied. Cylinder heads 3 and 4 are mounted and fixed on a cylinder block 2 of an internal combustion engine 1. Two intake passages 7.7' (Fig. 2) and two exhaust passages 8.89 are provided which open into the combustion chamber 6 defined by the upper end surface of the piston 5 and the recess 3a of the cylinder head 3. , sliding valves 10 and 20 are disposed at the open ends of the intake passages 7, 7'' and the exhaust passages 8, 8'' on the combustion chamber 6 side.

The sliding valve 10 is, for example, a double ball valve, and as shown in FIG. 10a,
A second sliding valve 10b consisting of valve bodies 11'', 12', valve body 13'' and a seal spring 141 disposed within 7 degrees of the intake passage, and a connecting member 1 that connects the valve bodies 13 and 13 degrees.
7. It is composed of a connecting member 18 that connects the valve body 13 and a rotating shaft 34 of a valve operating mechanism 30, which will be described later. Each of the valve seats 11 and 12 of the first sliding valve 10 has a disk shape, and each opposing end surface has a spherical valve seat surface 11a having a predetermined radius of curvature.
, 12a are recessed, and holes 11b, 12b having the same diameter as the inner diameter of the intake passage 7 are bored in the center. Each of these valve seats 11 and 12 is made of, for example, a ceramic member that has excellent heat resistance and wear resistance.

The valve body 13 has a spherical shape, and its radius is equal to the valve seat surface 11a.
, 12a, and its outer peripheral surface 13
a is in close contact with each valve seat surface 11a, 12a. A hole 13b having the same diameter as the inner diameter of the intake passage 7 is bored in the axial center of the valve body 13 in the diametrical direction. This valve body 13
Diametrically opposite side walls 13c, 13d with respect to the axis of the hole 13b
are notched to form parallel planes, and each side wall 13c, 13d
grooves 13e and 13f are provided on the diameter thereof, and these grooves 13e and 13f are arranged at a rotation angle of 90°. A seal spring 14, a valve seat 11, a valve element 13, and a valve seat 12 are arranged in this order from the combustion chamber 6 side in the intake passage 7. Valve seat surface 1 of seat 11.12
1a and 12a so as to be rotatably in sliding contact. The sliding valve 1o is
The peripheral surface 13a of the valve body 13 is the hole 11b of the valve seat 11.12,
The valve is closed when the valve body 12b is closed, and the valve is opened when the hole 13b of the valve body 13 communicates with the holes 11b and 12b of the valve seat 11.12. The slide valve 10 is alternately closed and opened every time the valve body 13 rotates 90 degrees.

The second slide valve 10b is also configured similarly to the first slide valve 10a. Note that the side wall 13°d of the valve body 13g of the second sliding valve 10b on the side opposite to the valve body 13 has a curved surface and is not provided with a groove.These two valve bodies 13 and 131 are not shown in the figure. The side wall 1 of the valve body 13 is arranged in parallel on the same axis as shown in FIG.
3d and the side wall 13c of the valve body 131 face each other at a predetermined distance, and are connected by a connecting member 17.

The connecting member 17 is a disc having the same diameter as the side wall 13C (or 13d) of the valve body 13, and has diametrically protruding stripes 17a on both end faces.

17b is provided protrudingly. These protrusions 17a and 17b
are arranged at a rotation angle of 90°, and each protrusion 17
a, 17b are concave grooves 13f, 13"e of the valve body 13.13"
The dimensions are set to fit. This connecting member 17 is interposed between the valve bodies 13 and 131 as shown in FIG. The two valves 13 and 13'' are fitted into the concave groove 131e to form an Oldham connection. Through this Oldham connection, the valve bodies 13 and 13° are three-dimensionally connected to each other with a degree of freedom, and the valve bodies 13, 13' and each valve seat 1
．． 12. The adhesion with 11° and 12° is improved, and the rotation of these valve bodies 13, 13' becomes smooth.

The connecting member 18 is also formed in the same manner as the connecting member 17, and one of the protrusions 18a fits into a groove 34a provided on the diameter of the end surface of a rotating shaft 34 of a valve mechanism 30 (FIG. 4), which will be described later. ,
The other protrusion 18b fits into the groove 13e of the valve body 13.
In this way, two sliding valves IO are constructed.

The two slide valves 20 disposed in the exhaust passage 8.81 are also constructed in the same manner as the slide valves 10 described above.

FIG. 4 shows an example of a valve mechanism, and this valve mechanism 30 is composed of, for example, a Geneva stop mechanism, and the cylinder
A sprocket 32 is fixed to one end of a main shaft 31 rotatably supported by a chain 38.
Sprocket fixed to one end of the crankshaft via
(both not shown). The sprocket 32 and the sprocket of the crankshaft have a tooth ratio of 2:1,
The main shaft 31 rotates once for every two revolutions of the crankshaft. A driving wheel 33 is fixed to the other end of the main shaft 31, and a valve opening pin 33a and a valve closing pin 33b are implanted on the circumference of the driving wheel at predetermined locations on the circumference of one end surface of the driving wheel, and on the other end surface A valve-opening pin 33c and a valve-closing pin 33d are implanted on the circumference at predetermined locations on the same circumference.

The rotating shafts 34, 36 are each rotatably supported by the cylinder head 3, and a driven wheel 35, 37 is fixed to one end of each. 90 along the circumferential direction of the driven cars 35 and 37, respectively.
Four radial grooves 35a and 37a are provided at equal intervals of .degree.

As the pins 33a and 33b of the driving wheel 33 rotate, they sequentially engage with the grooves 35a of the driven wheel 35, and the pins 33c and 33
d is a diametrically concave groove 34 as shown in FIG.
a is provided, and this groove 34a fits into the protrusion 18a of the connecting member 18. The valve body 13 and the rotating shaft 34 are connected to each other via the connecting member 18, and the valve body 13 and the rotating shaft 34 are connected three-dimensionally with a degree of freedom. 12 and rotation of the valve body 13 becomes smooth. The other end of the rotating shaft 36 is also connected to one valve body of the slide valve 20 via a connecting member (not shown), similarly to the rotating shaft 34.

The operation will be explained below.

As the crankshaft rotates, the main shaft 31 of the valve mechanism 30 moves to the fourth position.
As shown in the figure, the pin 3 of the drive wheel 33 rotates clockwise.
3a engages with a predetermined groove 35a of the driven vehicle 35 until it is removed, the driven vehicle 35 is rotated 90 degrees counterclockwise.
Rotate. Along with this, the valve bodies 13, 13'' of the sliding valve 10
is rotated 90° counterclockwise. The sliding valve 10 is opened when the pin 33a engages with the groove 35a, and is completely opened when it is pulled out. The driving wheel 33 rotates further, and the driven wheel 35 is rotated 90 degrees counterclockwise between when the pin 33b engages with the next groove 35a of the driven wheel 35 and when it is removed. Accordingly, the valve body 13.13'' is also rotated 90° counterclockwise.

The sliding valve 10 starts its closing operation when the pin 33b engages with the groove 35a, and is completely closed when it is pulled out.

Then, the slide valve 10 is stopped in a completely opened state for a certain period of time from when the valve starts to open until when it starts to close.

The driving wheel 33 rotates further and the pin 33a is next to the driven wheel 35! The driven wheel 35 is further rotated 90 degrees counterclockwise after it is fitted into the slider 135a until it is pulled out, and the slide valve 10 is accordingly opened again. And cough sliding valve 1
0 is stopped in a completely closed state during a certain period of the valve closing period from when the valve starts to close to when the valve starts to open. When the drive wheel 33 rotates clockwise in this way,
The driven vehicle 35 rotates counterclockwise intermittently, and the slide valve 10 is controlled to open and close accordingly, and is completely opened and closed for a predetermined period of time during which the slide valve 10 is opened and closed. will be stopped.

The rotating shaft 34 rotates once for every two revolutions of the main shaft 31. The slide valve 20 is also controlled to open and close in the same manner as the slide valve 10, and is completely opened for a predetermined period during which it is opened and closed.1. The valve is stopped in the closed state. Of course, these slide valves 10 and 20 are controlled to open and close at predetermined timing.

In this embodiment, a case has been described in which a Geneva stop mechanism is used as the valve mechanism, but the present invention is not limited to this, and it goes without saying that a cam-type valve mechanism may be applied.

In addition, in this embodiment, a chain type method is described in which the sliding valve is driven directly by the rotation of the crankshaft, but the method is not limited to this. An electric drive method such as a step motor may also be used.

(Effects of the Invention) As explained above, according to the present invention, a sliding surface that is specially arranged in each of the intake and exhaust passages that communicate with the combustion chamber of an internal combustion engine, and a sliding surface that closes each of these passages and a through-hole that opens. a sliding valve comprising a spherical valve body having a hole; a valve seat that slides on the valve body and rotatably supports the valve body; a valve mechanism having an intermittent machine that opens and closes the valve body for a predetermined period of time, and stops the movement of the valve body for a predetermined period during each opening and closing period, and a drive shaft for each of the valve bodies and the valve mechanism; Since it is equipped with a connecting member that connects the valve body, it is possible to absorb thermal distortion of the valve body of the method and misalignment due to processing accuracy.As a result, sealing performance and uneven wear of the seal are prevented, and the sliding This has the excellent effect of significantly improving the durability and performance of the valve train.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing an embodiment of an internal combustion engine to which a valve train according to the present invention is applied, FIG. 2 is an end view of a combustion chamber of the engine shown in FIG. 1, and FIG. Arrow line m-m in the diagram
The sectional view and FIG. 4 are schematic configuration diagrams showing one embodiment of the valve mechanism. 1... Engine, 2... Cylinder block, 3, 4
... Cylinder head, 10.20 ... Sliding valve, 11
゜12.11', 12'...valve seat, 13.13'...
- Valve body, 17.18... Connection member, 30... Valve mechanism, 33... Drive vehicle, 35.37... Driven vehicle. Applicant Honda Motor Co., Ltd. Agent Patent Attorney Toshi Watanabe Otoma Kanni Ryo Nagato 1 Figure 2 Eye 3 Figure 4 Procedural Amendment (White Side July 24, 1985 Commissioner of the Patent Office Michi Uga) Department: 1. Indication of the case: 1985 Patent Application No. 74516 2. Name of the invention: Internal combustion engine valve train 3. Person making the amendment: Relationship with the case. Patent applicant address: 6-27-8 Jingumae, Shibuya-ku, Tokyo. Issue name (5
32) Hisashi Honda Motor Co., Ltd. Representative
Yone Koreshi 4, Agent address: 1-1, 2-6-4 Toranomon, Minato-ku, Tokyo
Mori Building 7th Floor 5, Claims column, Detailed Description of the Invention column and Drawing 6 of the specification to be amended, Contents of the amendment (1) The claims of the present application will be amended as shown in the attached sheet. (2) On page 2, line 13 of the specification of the present application, the phrase "large size" is amended to "large size." (3) On page 4, lines 5 to 11, the phrase ``Connection with the valve body'' has been amended to the following sentence. ``A rotary valve, which opens and closes each rotary valve for a predetermined period in conjunction with the movement of the piston of the engine, and rotates or oscillates to stop the movement of the valve body for a predetermined period during each opening and closing period. "Allowing rotational misalignment of the rotation axes between a valve mechanism having an intermittent function, each rotary valve, and the rotational output shaft of the valve mechanism" (4), page 5, lines 10 to 10. 11
Correct the line ``valve body'' to ``valve seat.'' (5) Correct "10" in the 16th line of the same page to rloaJ. (6) "Slide valve 10" on page 6, line 18 is corrected to "first sliding valve 10aJ." (7) "r13cJ" on page 7, line 11 of the same page is changed to r13'
Correct to cJ. (8) In the 14th line of the same page, the phrase "same diameter as" is corrected to "same diameter as the end face of". (9) Page 8, line 15 of the same page, ``are'' is replaced with ``are''.
6 (10) From page 12, line 20 to page 13, line 7, “
The phrase “valve body and ~connecting member” has been corrected to the following sentence. A rotating or oscillating valve that opens and closes each rotary valve for a predetermined period in conjunction with the movement of the piston during the period, and stops the movement of the valve body for a predetermined period during each opening and closing period. "A valve train mechanism having an intermittent operation function, and rotational tolerance of misalignment of mutual rotation axes between each rotary valve and the rotational output shaft of the valve train mechanism" (11) Referring to the drawings attached to the specification of the present application. Figures 1 and 3
Correct the figure as per the attached sheet. Claims after amendment

Claims (1)

[Claims] 1. A spherical valve body disposed separately in intake and exhaust passages communicating with a combustion chamber of an internal combustion engine, and having a sliding surface that closes each passage and a through hole that opens; a sliding valve comprising a valve seat that is in sliding contact and rotatably supports the valve body;
A valve operating mechanism having an intermittent function that opens and closes each of the sliding valves for a predetermined period of time in conjunction with the movement of a piston of the engine, and stops the movement of the valve body for a predetermined period of time during each opening and closing period. A valve train for an internal combustion engine, comprising: a connecting member that connects each of the valve bodies to a drive shaft of the valve train.