JPS603412A - Valve moving mechanism for internal-combustion engine - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of gaps, by supporting a valve-opening rocker arm and a valve-closing rocker arm on an identical shaft and making the mounted angles of the arms adjustable. CONSTITUTION:A valve-opening rocker arm 14 and a valve-closing rocker arm 15 are supported on a rocker arm shaft 16 so that the arms are swung by a valve-opening cam 12 and a valve-closing cam 13, respectively. The mounted angles of the rocker arms 14, 15 can be adjusted by a screw 17. The tip 14b of the valve-opening rocker arm 14 is placed at both the top and bottom on the rocker arm bearer 8 of an intake or exhaust valve 7 so that the valve is forcibly driven in both opening and closing directions. Gaps d1, d2, d3 are made appropriate by adjusting the screw 17 and the rocker arm bearer 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve operating mechanism in an internal combustion engine, and more specifically, a method for appropriately adjusting valve operation of a forced valve opening/closing R structure. Regarding the tjM structure.

In general, it has been considered to employ a forced valve opening/closing mechanism in order to reduce the drive loss of the valve mechanism that occurs when the engine rotates at high speed. In the case of a so-called forced valve opening/closing mechanism in which a cam is used to forcibly operate a valve not only when the valve is closed but also when the valve is closed, the valve drive end of the rocker arm comes into contact with the rocker arm holder installed at the top of the valve stem. A slight clearance is provided between the two (to prevent incomplete opening of the valve due to thermal distortion).Furthermore, the rocker arm has separate parts for valve closing and valve closing. Since the conventional means is to be pivotally supported on a double armshaft, the peripheral equipment 4M of the cylinder head is complicated and occupies a large space in terms of volume.

Furthermore, regarding the problem of the clearance between the valve drive end of the rocker arm and the rocker arm receiver as described above, if this is to be replaced with clearance on the sliding surface between the slipper surface and the cam surface and adjusted appropriately, each should be set separately. ] IJi-like adjustments are especially difficult 1
1. Conventional parts selection IR 1 go but trial tjj
The current situation is that we have to follow the 4-gun procedure of RS+ and have to rely on technical J5 and experience and intuition.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a valve operating mechanism for an internal combustion engine that eliminates the above-mentioned problems with conventional drawing.

To achieve this objective, the present invention is based on a single roduca armworm! For the shift, both the valve closing and valve closing lever arms are coaxially supported, and an adjustment means is provided to adjust the angle of the double-ended lever arm (in other words, it is possible to set the clearance. The gist is a configuration that can be easily adjusted using adjustment means.

Hereinafter, a valve mechanism for an internal combustion engine, which is an embodiment of the present invention, will be described in detail with reference to the drawings. As shown in FIG. 1, the piston 2 moves back and forth 11 times within the cylinder 1 to perform a cycle process. The cylinder head 3 forms a combustion chamber 4 between it and the cylinder 1, and also has an intake hole 5 and one air hole 6. On the combustion chamber 4 side of both of these holes, there is an intake air, iJl, for opening and closing it. An air valve 7.7 is provided. Each of the valves 7.7 has a valve stem 7a on the right, and a rocker arm receiver 8 having flanges 3a, 8b is screwed above the valve stem 7a.

I] The lacquer ram receiver 8 is tightened by the lock nuts 1 to 9 above the flange 8a, so that the fixed position relative to the valve stem 7a can be freely adjusted. Then, the rocker arm receiver 8 is pushed up from below by the spring 10 loaded on the valve stem 7a, that is, the entire valve 7 is in its normal state due to the elastic force of the spring 10, and the intake hole 5 and the exhaust hole 6 are pushed up. should be closed. Note that 10a in the figure indicates a vibration isolator mechanism for dealing with the valve bounce phenomenon.

On the other hand, on a camshaft 11 inserted through the center of the cylinder head 3, there are cams corresponding to the intake and exhaust valves 7.7, that is, a valve-closing drive cam 12 and a valve-closing drive cam 13 that share the same axis. It is formed by Then, the 1" lever arm 14, which is in contact with the valve closing drive cam 12, and the 3.1" lever arm 14, which is in contact with the closing 5-r drive cam 13, is connected to the valve closing drive cam 12. It can be swung freely.

The other end of the valve closing arm 14 is further provided with a valve driving end 14b that is sandwiched between and engaged with the upper and lower flanges 8a and 8b of the rocker arm receiver 8.
An adjustment screw 17 is screwed into the intermediate portion between the rocker arm shirts 1 to 16 and the tip 17a of the adjustment screw 17.
is in contact with the pipe end of the valve closing rocker arm 15). Therefore, by rotating the adjusting means using the adjusting screw 17, the angle formed between the rocker arm 14 and the 1-1 horn J arm 15 can be varied, and the rocker arm 1\15 can freely pivot relative to the rocker arm 14.

The reason for this structure is that the quantity valve drive nozzle 12
The inertial force of the valve-closing rocker arm 15, which rotates in response to the rotation of the valve-closing rocker arm 14. , J: Reno]X. Note that 18.184 in the figure is a removable cover for repair and inspection. (line that almost connects the opposite point)
The convenience of inserting it from the direction of J is obsolete. Hitting too,
Surin/Gi 1 that occurs between the < surface and the base surface of ノ J At the narrowest part of the knob (13), connect gear A to the cam base at both ends of the knob.
It is desirable that the opening 20.20 is large enough to allow a wire (approximately the same) to be inserted therethrough. Therefore, while the cover 18.184 is closed, the L1 section 20.20
When the size of the rocker arm receiver 8 is increased, the position adjustment of the rocker arm receiver 8 and the angle adjustment of the double-end hook arm 14.15 are also carried out from substantially the same direction. In the figure, reference numeral 19 indicates cover mounting ports 1 to 1.

Next, the clearance d1 shown in FIG. 2 is generated during processing and may be omitted. Further, a clearance d2 slightly larger than the thermal strain J3 of each part and the eccentricity of the cam 12 is set between the slipper surface 14a and the valve-closing driving cam 12 which are in sliding contact with each other by adjusting the rocker arm receiver 8. Similarly, a clearance d3 is set between the slipper surface 15a of the swinging valve-closing rocker arm 15 and the cam 13 by the adjusting screw 17.

Here, clearance d+, d2. The relationship between the three parts of d3 and the adjustment procedure will be explained. In advance, the clearance d1 between the valve driving end 14b of the valve closing rocker arm 14 and the upper and lower flanges 8a, 8b of the rocker arm receiver E3 is determined as follows.
Keep it moist. Next, the gap gauge is placed between the lower flange E3b of the rocker arm receiver 8 and the valve drive end 14b so that a desired clearance d2 is provided between the slipper surface 14a and the decoy contact surface of the cam 12. Adjust the position of the rocker arm receiver 8 by moving it up and down so that they touch each other. J3, [
The J nut 9 is for fixing the arm holder 8. Next, the clearance d3 is obtained by subtracting the clearance d1, which is smaller than the clearance 02, from the desired gap between the slipper surface 15a of the closure frame 1 for valve closing and the contact surface of the cam 13. Move the adjusting screw 17 up and down to obtain the desired result. That is, each slipper surface 14a of the double-ended hook arm 14.15 is adjusted by the adjustment screw 17.

15a and adjust the angle. However, at this time, it is necessary to keep the valve drive end 14b of the valve-closing rocker arm 14 in contact with the lower flange 8b of the lock arm receiver 8.

The operation of the embodiment of the mechanism of the present invention constructed as described above is as follows. The piston 2 reciprocates within the syringe 1, and as the piston 2 rotates, the foot 11 rotates at a set timing, and the intake and exhaust valves 7.7 are opened at a predetermined timing. For example, during the stroke in which the intake valve opens, the camshaft 1 shift 11 rotates, and the valve-closing cam 12 comes into contact with the valve-closing rocker arm 1.
When the slipper surface 14a of 4 is pushed up, the action is a downward movement of the valve driving end 14 ( ) of the valve-closing rocker arm 14, and the entire valve 7 is pushed down toward the valve-opening horn, that is, downward in the figure.

At this time, since there is a spring '10, there is some resistance due to its force, but the spring '10 is set to such an extent that the valve 7 is kept in contact with the intake hole 5 until saturation. Since the 911 horn is weak, output loss due to friction can be reduced. At the time of such a valve closing operation, the surface of the valve-closing cam 13 facing the slipper surface 15a of the valve-closing lever arm 15 is lowered from a high position to a low position, and the valve-closing lever arm 14 is rotated. ) because it allows rotation in the clockwise direction.

Furthermore, in the quiet 111'r where the rotation of the camshaft 11 progresses and the opposing surface of the slipper surface 14 of the valve closing rocker arm 14 of the valve closing cam 12 returns from the high position to the 41°C position, Same as this +!II and the horn 1 of the valve closing cam 13
The hem portion contacts the slipper surface 15a of the valve-closing rocker arm 15 to prevent the arm 15 from rotating, and its back working end 15b
pushes up the tip 17a4 of the adjustment screw 17 towards Hijikata. As a result, the valve-opening rocker arm 14 rotates in the valve-closing direction, and the valve drive end 1411 pushes back the rocker arm receiver 8 upwards, thereby closing the valve 7.

Therefore, as is clear from the above description, the present invention provides the following effects. That is, since the two rotary J-arms for opening and closing valves are pivotally supported on the same shaft, the entire mechanism can be simplified and the cylinder head can be made into a compact cylinder. In addition, the clearance adjustment of the double-ended latch arm can be quickly and efficiently done by using an adjustment screw, which eliminates the need for selecting and combining parts as in the past, and even if necessary, the valve-closing rocker arm The only thing you need to do is adjust the clearance between the valve drive end of the valve and the upper and lower flanges of the rocker arm receiver. Furthermore, I wonder if Halbsbrink's composition is similar to J-ki? We were able to use the JI1 engine, which has a relatively weak force, and we were able to reduce the 1% +jN force between the slipper surface cam and the cam on both rock bottoms.
This means that the fuel efficiency improves especially at low speeds such as when the engine is idling, and if more output is obtained and there is less engine stalling, the performance will be improved by 8 times.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a 15-degree insulator in which a valve train 14B4 of the present invention is inserted, FIG. 2 is a partially enlarged view thereof, and FIG. 3 is a plan view thereof. Explanation of symbols of main parts 5... Intake hole 6... JJ + Air hole 7.
... Valve 7a ... Valve stem 8.
...Rotsukano'-1\Uke 10...Spring 11...) J Mushi 17-1-12...Cam 13 for driving quantity valve... ... Valve closing drive cam 14... Volume valve rocker arms 14a, 15a'--... Surin/<! n! 1
4b...Valve drive end 15...Rocker arm i for valve closing 5b...Back working end 16...Rocker arm shaft 17...
・Adjustment screw 18...Cover d H, d 7. d 3... Clearance applicant Honda Gisen Co., Ltd. 1 Agent Patent attorney Motohiko Fujitoshi Figure 2 Figure 3

Claims (1)

[Claims] An internal combustion engine characterized in that both a valve-closing rocker arm and a valve-closing rocker arm are swingably supported on a single rocker arm shaft, and the angle formed by both the 7J arms is adjusted by an adjusting means. The valve train M a